JP3842458B2 - Attaching / detaching the split-type shielding lid of the radioactive material storage - Google Patents

Attaching / detaching the split-type shielding lid of the radioactive material storage Download PDF

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JP3842458B2
JP3842458B2 JP32360798A JP32360798A JP3842458B2 JP 3842458 B2 JP3842458 B2 JP 3842458B2 JP 32360798 A JP32360798 A JP 32360798A JP 32360798 A JP32360798 A JP 32360798A JP 3842458 B2 JP3842458 B2 JP 3842458B2
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JP2000147194A (en
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光 小川
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Kobe Steel Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Description

【０００１】
【発明の属する技術分野】
本発明は、原子力発電所や再処理工場等における放射性物質の貯蔵に使用される放射性物質用ピット式またはサイロ式の貯蔵庫等の分割式遮蔽蓋の着脱方法に関するものである。
【０００２】
【従来の技術】
一般に、放射性物質用ピット式またはサイロ式の貯蔵庫は、放射性物質をクレーン装置に懸吊しながら搬入および搬出することができるように、放射性物質の搬入出口を上面に有している。そして、貯蔵時においては、コンクリート等を大きな厚みで形成した遮蔽蓋で搬入出口が塞がれることによって、放射線の漏洩が十分に低減されている。
【０００３】
ところで、貯蔵庫の搬入出口が大きな開口面積である場合には、一体物の遮蔽蓋であると、相当の重量物になるため、通常、複数個の蓋部材に分割可能な分割式遮蔽蓋を用いて搬入出口の開閉に用いるクレーン等が過大になることを避けている。この際、分割式遮蔽蓋の接合部は、図３５に示すように、各蓋部材５２端面が直線状に形成されていると、隣接する蓋部材５２の端面同士の隙間から放射線が５５の矢符方向に漏洩する。
【０００４】
従って、従来の分割式遮蔽蓋は、図３４（ａ）〜（ｃ）に示すように、各蓋部材５２の端面を段状に形成し、搬入出口５１ａにおける端部側の蓋部材５２の段部を中央側の蓋部材５２の段部で押さえ付けるように構成することによって、貯蔵時における放射性物質の漏洩が低減されている。そして、このように構成された分割式遮蔽蓋は、各蓋部材５２の着脱作業が下記の手順で行われることよって、放射性物質５３の搬入時および搬出時における放射線の漏洩も低減されている。
【０００５】
即ち、先ず、中央部のＡ位置に存在する蓋部材５２を抜脱した後、Ｂ位置およびＣ位置の蓋部材５２を抜脱する。そして、第１収容部▲１▼および第２収容部▲２▼に対する放射性物質５３の搬入出をそれぞれ行った後、Ｃ位置の蓋部材５２を装着し、第３収容部▲３▼に対する放射性物質５３の搬入出を行う。
【０００６】
次に、Ｂ位置の蓋部材５２を装着する一方、Ｄ位置およびＥ位置の蓋部材５２を抜脱し、第４収容部▲４▼および第５収容部▲５▼に対する放射性物質５３の搬入出をそれぞれ行う。そして、Ｅ位置の蓋部材５２を装着し、第６収容部▲６▼に対する放射性物質５３の搬入出を行った後、Ｄ位置の蓋部材５２を装着する。この後、第７位置▲７▼に対する放射性物質５３の搬入出を行った後、Ａ位置の蓋部材５２を装着することによって、搬入出口５１ａの一部を常に閉じた状態で全ての放射性物質５３の搬入出を完了することが可能になっている。尚、図３４（ｃ）の段構造（Ｚ部）は、多くの例があるが、本発明の要件ではないので説明を省略する。
【０００７】
【発明が解決しようとする課題】
しかしながら、上記従来の構成および着脱手順では、貯蔵庫本体５１の両端部の収容部（第１収容部▲１▼や第４収容部▲４▼）に対して放射性物質５３を搬入出する際に、中央部（Ａ位置）から端部（Ｃ位置やＥ位置）までの３枚の蓋部材５２を抜脱する必要があるため、搬入出口５１ａが必要以上に大きな面積で開口することにより放射線の漏洩を十分に低減することができない。そして、放射線の漏洩を十分に低減できないと、貯蔵庫本体５１の上方における空間線量率の上昇を招来するという放射線管理上好ましくない事態が生じると共に、放射性物質５３の搬入出中にクレーン装置が故障した場合のように、オペレータが放射性雰囲気中で蓋部材５２を装着する必要が生じた場合に、被曝量の増大を招来するという問題が生じる。
【０００８】
さらに、従来においては、貯蔵庫本体５１の第１収容部▲１▼に対する搬入出のみを行う場合であっても、中央部（Ａ位置）から端部（Ｃ位置やＥ位置）までの３枚の蓋部材５２を着脱操作する必要があるため、蓋部材５２の開閉作業に無駄が生じ易いという問題がある。
【０００９】
また、従来の分割式遮蔽蓋では、蓋部材５２が放射性物質５３の搬入出時に障害とならないように、蓋部材５２のサイズを放射性物質５３に対応させようとすると、中央部のＡ位置に存在する蓋部材５２が他の蓋部材５２よりも大型化し易い。そして、この蓋部材５２の大型化は、蓋部材５２や放射性物質５３を運搬するクレーン装置を大型化させる必要を生じさせる。さらに、搬入出口５１ａの開口面積が大きくなると、多数の蓋部材５２を仮置きするためのスペースが必要になる。従って、従来においては、クレーン装置の大型化や仮置き用の大きなスペースが必要となって設備コストが増大するという問題がある。
【００１０】
そこで、本発明は、▲１▼比較的に小型のクレーン装置で放射性物質５３の搬入出を行うことができると共に、▲２▼放射性物質５３の搬入出時における放射線の漏洩を十分に低減することができるように、搬入出口５１ａの開口面積を必要最小限に抑制し、▲３▼さらに蓋部材５２の着脱操作の回数を減少させた状態で放射性物質５３の搬入出を行うことができる分割式遮蔽蓋およびその着脱方法を提供しようとするものである。
【００２０】
【課題を解決するための手段】
上記課題を解決するために、請求項１の発明は、上面側から下面側にかけて水平幅を所定量単位で減少させるように形成された段部を一端面および他端面にそれぞれ備えた主蓋部材と、上面側から下面側にかけて水平幅を所定量単位で減少および増加させるように形成された段部を一端面および他端面にそれぞれ備えた複数の副蓋部材とを有し、これら主蓋部材および副蓋部材を段部同士を重複させながら配列することにより貯蔵庫本体の搬入出口を塞ぐ分割式遮蔽蓋の着脱方法であって、前記主蓋部材は、各段部ごとに層状に分割された層状主部材からなり、前記副蓋部材は、各副蓋部材を構成する各段部が一体的に結合されており、前記主蓋部材を抜脱して待機位置に仮置きすることによって、該主蓋部材の抜脱位置に開口部を形成する仮置き工程と、前記開口部を介して貯蔵庫本体に対する放射性物質の搬入出を行う搬入出工程と、前記開口部に隣接する副蓋部材を抜脱して水平面で旋回した後、該開口部に移載して新たな開口部を形成する旋回移載工程と、前記搬入出工程と前記旋回移載工程とを搬入出の終了または中断まで繰り返す反復工程と、前記反復工程後に前記待機位置の主蓋部材を前記開口部に移載する遮蔽工程とを有することを特徴としている。
また、請求項２の発明は、上面側から下面側にかけて水平幅を所定量単位で減少させるように形成された段部を一端面および他端面にそれぞれ備えた主蓋部材と、上面側から下面側にかけて水平幅を所定量単位で減少および増加させるように形成された段部を一端面および他端面にそれぞれ備えた複数の副蓋部材とを有し、これら主蓋部材および副蓋部材を段部同士を重複させながら配列することにより貯蔵庫本体の搬入出口を塞ぐ分割式遮蔽蓋の着脱方法であって、前記主蓋部材は、前記副蓋部材と同一形状に形成された第１部材と、前記主蓋部材から前記第１部材の幅を差し引いた逆凸型部材とからなり、前記副蓋部材は、各副蓋部材を構成する各段部が一体的に結合されており、前記主蓋部材を抜脱して待機位置に仮置きすることによって、該主蓋部材の抜脱位置に開口部を形成する仮置き工程と、前記開口部を介して貯蔵庫本体に対する放射性物質の搬入出を行う搬入出工程と、前記開口部に隣接する副蓋部材を抜脱して水平面で旋回した後、該開口部に移載して新たな開口部を形成する旋回移載工程と、前記搬入出工程と前記旋回移載工程とを搬入出の終了または中断まで繰り返す反復工程と、前記反復工程後に前記待機位置の主蓋部材を前記開口部に移載する遮蔽工程とを有することを特徴としている。
上記の構成によれば、主蓋部材や副蓋部材のサイズに対応した開口部を順次形成しながら放射性物質の搬入出を行うことができるため、搬入出口の開口面積を必要最小限に抑制することにより放射線の漏洩を十分に低減することができる。しかも、単一開口毎に実施でき、蓋の仮置き場所も主蓋部材用のスペースのみで済む。
【００２１】
請求項３の発明は、分割式遮蔽蓋の着脱方法であって、上面側から下面側にかけて水平幅を所定量単位で減少させるように形成された段部を一端面および他端面にそれぞれ備えた主蓋部材と、上面側から下面側にかけて水平幅を所定量単位で減少および増加させるように形成された段部を一端面および他端面にそれぞれ備えた複数の副蓋部材とを有し、これら主蓋部材および副蓋部材を段部同士を重複させながら配列することにより貯蔵庫本体の搬入出口を塞ぐ分割式遮蔽蓋の着脱方法であって、前記主蓋部材を抜脱して待機位置に仮置きすることによって、該主蓋部材の抜脱位置に開口部を形成する仮置き工程と、前記開口部を介して貯蔵庫本体に対する放射性物質の搬入出を行う搬入出工程と、前記開口部に隣接する副蓋部材を抜脱して水平面で旋回した後、該開口部に移載して新たな開口部を形成する旋回移載工程と、前記搬入出工程と前記旋回移載工程とを搬入出の終了または中断まで繰り返す反復工程と、前記反復工程後に前記待機位置の主蓋部材を前記開口部に移載する遮蔽工程とを有することを特徴としている。
上記の構成によれば、主蓋部材や副蓋部材のサイズに対応した開口部を順次形成しながら放射性物質の搬入出を行うことができるため、搬入出口の開口面積を必要最小限に抑制することにより放射線の漏洩を十分に低減することができる。しかも、単一開口毎に実施でき、蓋の仮置き場所も主蓋部材用のスペースのみで済む。
【００２２】
請求項４の発明は、分割式遮蔽蓋の着脱方法であって、上面側から下面側にかけて水平幅を所定量単位で減少させるように形成された段部を一端面および他端面にそれぞれ備えた主蓋部材と、上面側から下面側にかけて水平幅を所定量単位で減少および増加させるように形成された段部を一端面および他端面にそれぞれ備えた複数の副蓋部材とを有し、これら主蓋部材および副蓋部材を段部同士を重複させながら配列することにより貯蔵庫本体の搬入出口を塞ぐ分割式遮蔽蓋の着脱方法であって、前記貯蔵庫本体には、前記主蓋部材が一端側に位置するように正方向に配列された分割式遮蔽蓋で塞がれた第１搬入出口と、前記主蓋部材が他端側に位置するように逆方向に配列された分割式遮蔽蓋で塞がれた複数の第２搬入出口とが、同一寸法で搬入出口長手方向か搬入出口幅方向の何れかの方向に並列配置されており、前記第１搬入出口および特定の第２搬入出口の主蓋部材をそれぞれ抜脱して待機位置に仮置きすることによって、各主蓋部材の抜脱位置に開口部を形成する仮置き工程と、前記第１搬入出口の開口部を介して貯蔵庫本体に対する放射性物質の搬入出を行う搬入出工程と、前記第１搬入出口および前記第２搬入出口の開口部に隣接する副蓋部材をそれぞれ抜脱し、前記第２搬入出口および第１搬入出口の開口部にそれぞれ移載して新たな開口部を形成する移載工程と、前記搬入出工程と前記移載工程とを搬入出の終了または中断まで繰り返す反復工程と、前記反復工程において第１搬入出口の開口位置が最端部まで移動した後に、前記第１搬入出口の開口部に次の第２搬入出口の主蓋部材を移載し、前記特定の第２搬入出口を第１搬入出口とし、前記次の第２搬入出口を特定の第２搬入出口とした後、これら新たな第１搬入出口と第２搬入出口との間で前記反復工程を行う別庫移行工程と、前記反復工程後に、前記待機位置の主蓋部材を前記第１搬入出口および第２搬入出口の開口部にそれぞれ移載する遮蔽工程とを有することを特徴としている。
上記の構成によれば、主蓋部材や副蓋部材のサイズに対応した開口部を順次形成しながら放射性物質の搬入出を行うことができるため、搬入出口の開口面積を必要最小限に抑制することにより放射線の漏洩を十分に低減することができる。また、請求項１乃至請求項３の場合のように副蓋部材を水平面で旋回させるための旋回装置を不要にすることができる。さらに、第１搬入出口と第２搬入出口との間で行われる反復工程を、別庫となる新たな第１搬入出口と第２搬入出口との間に移行する際の主蓋部材の着脱操作を少なくすることができる。
【００２３】
請求項５の発明は、分割式遮蔽蓋の着脱方法であって、上面側から下面側にかけて水平幅を所定量単位で減少させるように形成された段部を一端面および他端面にそれぞれ備えた主蓋部材と、上面側から下面側にかけて水平幅を所定量単位で減少および増加させるように形成された段部を一端面および他端面にそれぞれ備えた複数の副蓋部材とを有し、これら主蓋部材および副蓋部材を段部同士を重複させながら配列することにより貯蔵庫本体の搬入出口を塞ぐ分割式遮蔽蓋の着脱方法であって、前記貯蔵庫本体には、前記主蓋部材が一端側に位置するように正方向に配列された分割式遮蔽蓋で塞がれた第１搬入出口と、前記主蓋部材が他端側に位置するように逆方向に配列された分割式遮蔽蓋で塞がれた第２搬入出口とを一組とする複数組が、同一寸法で搬入出口長手方向か搬入出口幅方向の何れかの方向に並列配置されており、前記複数組中の特定組における第１搬入出口および第２搬入出口の主蓋部材をそれぞれ抜脱して待機位置に仮置きすることによって、各主蓋部材の抜脱位置に開口部を形成する仮置き工程と、前記第１搬入出口の開口部を介して貯蔵庫本体に対する放射性物質の搬入出を行う第１搬入出工程と、前記第２搬入出口の開口部に隣接する副蓋部材を抜脱し、前記第１搬入出口の開口部に移載して新たな開口部を第２搬入出口に形成する第１移載工程と、前記第２搬入出口の開口部を介して貯蔵庫本体に対する放射性物質の搬入出を行う第２搬入出工程と、前記第１搬入出口の開口部に隣接する副蓋部材を抜脱し、前記第２搬入出口の開口部に移載して新たな開口部を第１搬入出口に形成する第２移載工程と、前記第１搬入出工程、前記第１移載工程、前記第２搬入出工程および前記第２移載工程を搬入出の終了または中断まで繰り返す反復工程と、前記反復工程後に前記待機位置の主蓋部材を前記第１搬入出口および第２搬入出口の開口部にそれぞれ移載する遮蔽工程とを有することを特徴としている。さらに、反復工程中、第１搬入出口と第２搬入出口とが端部まで移動し、さらに継続して作業する場合、他の組の主蓋部材を用いて第１および第２搬入出口を閉じ、新たな組の貯蔵庫に開口を設ける別庫移行もできる。
上記の構成によれば、請求項４の場合よりも少ない蓋部材の着脱操作回数で放射性物質の搬入出を行うことが可能になり、主蓋部材や副蓋部材のサイズに対応した開口部を順次形成しながら放射性物質の搬入出を行うことができるため、搬入出口の開口面積を必要最小限に抑制することにより放射線の漏洩を十分に低減することができる。尚、第１移載工程と第２移載工程は、順序を逆にしても支障はない。
【００２４】
請求項６の発明は、分割式遮蔽蓋の着脱方法であって、上面側から下面側にかけて水平幅を所定量単位で減少させるように形成された段部を一端面および他端面にそれぞれ備えた主蓋部材と、上面側から下面側にかけて水平幅を所定量単位で減少および増加させるように形成された段部を一端面および他端面にそれぞれ備えた複数の副蓋部材とを有し、これら主蓋部材および副蓋部材を段部同士を重複させながら配列することにより貯蔵庫本体の搬入出口を塞ぐ分割式遮蔽蓋の着脱方法であって、前記主蓋部材は、前記副蓋部材と同一形状に形成された第１部材と、前記主蓋部材から前記第１部材の幅を差し引いた逆凸型部材とからなり、前記副蓋部材は、各副蓋部材を構成する各段部が一体的に結合されており、前記貯蔵庫本体には、前記主蓋部材が一端側に位置するように正方向に配列された分割式遮蔽蓋で塞がれた第１搬入出口と、前記主蓋部材が他端側に位置するように逆方向に配列された分割式遮蔽蓋で塞がれた第２搬入出口とを一組とする複数組が、同一寸法で搬入出口長手方向か搬入出口幅方向の何れかの方向に並列配置されており、前記複数組中の特定組における第１搬入出口および第２搬入出口の逆凸型部材および第１搬入出口の第１部材をそれぞれ抜脱して待機位置に仮置きすることによって、第１搬入出口に放射性物質の搬入出を可能とする開口部を形成する仮置き工程と、前記第１搬入出口の開口部を介して貯蔵庫本体に対する放射性物質の搬入出を行う第１搬入出工程と、前記第２搬入出口の開口部に隣接する第１部材または副蓋部材を抜脱し、前記第１搬入出口の開口部に移載して新たな開口部を第２搬入出口に形成する第１移載工程と、前記第２搬入出口の開口部を介して貯蔵庫本体に対する放射性物質の搬入出を行う第２搬入出工程と、前記第１搬入出口の開口部に隣接する副蓋部材を抜脱し、前記第２搬入出口の開口部に移載して新たな開口部を第１搬入出口に形成する第２移載工程と、前記第１搬入出工程、前記第１移載工程、前記第２搬入出工程および前記第２移載工程を搬入出の終了または中断まで繰り返す反復工程と、前記反復工程後に前記待機位置の主蓋部材を前記第１搬入出口および第２搬入出口の開口部にそれぞれ移載する遮蔽工程とを有することを特徴としている。
上記の構成によれば、請求項４の場合よりも少ない蓋部材の着脱操作回数で放射性物質の搬入出が可能になり、主蓋部材や副蓋部材のサイズに対応した請求項５より少ない開口部を順次形成しながら放射性物質の搬入出を行うことができるため、搬入出口の開口面積を必要最小限に抑制することにより放射線の漏洩を十分に低減することができる。また、別庫移行も実施することができる。
【００２６】
【発明の実施の形態】
〔実施形態１〕
本発明の第１の実施形態を図１ないし図９に基づいて以下に説明する。
第１の実施形態に係る分割式遮蔽蓋は、図１に示すように、貯蔵庫本体１とで放射性物質用貯蔵庫を構成している。貯蔵庫本体１は、ピット式やサイロ式等の構造体からなっており、ピット式の貯蔵庫本体１は、図２に示すように、外周壁３で囲まれた空間を仕切り壁４で区分することによって、複数の貯蔵室にそれぞれ搬入出口１ａを有した構成にされている。一方、サイロ式の貯蔵庫本体１は、図３に示すように、外周壁３で囲まれた内部空間の上部を梁部材５で区分することによって、一つの貯蔵室（内部空間）に対して複数の搬入出口１ａを有した構成にされている。
【００２７】
上記の貯蔵庫本体１の搬入出口１ａには、図１に示すように、分割式遮蔽蓋が載置されている。分割式遮蔽蓋は、上面側から下面側にかけて水平幅を所定量単位で減少させるように形成された段部を一端面および他端面にそれぞれ備えた主蓋部材２１と、上面側から下面側にかけて水平幅を所定量単位で減少および増加させるように形成された段部を一端面および他端面にそれぞれ備えた複数の副蓋部材２２とを有している。そして、これら主蓋部材２１および副蓋部材２２は、放射線が両当接部７ａ・８ａの隙間を同時に通過して外部に漏洩しないように段部同士を重複させながら配列されることによって、貯蔵庫本体１の搬入出口１ａを塞いでいる。
【００２８】
上記の主蓋部材２１および副蓋部材２２は、段部で層状に分割された上部層７と下部層８との２層構造にされている。主蓋部材２１は、上部層７の第１蓋部材２ａ（層状主部材）と下部層８の第６蓋部材２ａ' （層状主部材）とからなっている。また、各副蓋部材２２は、上部層７の第２〜第５蓋部材２ｂ〜２ｅ（層状副部材）と下部層８の第７〜第１０蓋部材２ｂ' 〜２ｅ' （層状副部材）とからなっている。そして、上部層７における蓋部材２ａ〜２ｅ同士の当接部７ａと、下部層８における蓋部材２ａ' 〜２ｅ' 同士の当接部８ａとは、主蓋部材２１および副蓋部材２２が段部同士を重複させた状態となるように、水平方向に所定のズレ量ｄを変位した位置に設定されている。
【００２９】
上記の第１〜第１０蓋部材２ａ〜２ｅ' は、図４（ａ）〜（ｃ）に示すように、長方形状の平板状に形成されており、同一の厚みおよび長さに設定されている。各蓋部材２ａ〜２ｅ' の上面には、吊上げ機構を構成する複数の係合部９が形成されている。各係合部９は、図５（ａ）・（ｂ）に示すように、各蓋部材２ａ〜２ｅ' 内に形成された係合穴９ａと、係合穴９ａの上面の一部を開放した挿入口９ｂとを有している。挿入口９ｂは、懸吊部材６の横断面形状に略一致するように形成されており、懸吊部材６は、任意の角度に回動可能な回動軸６ｂと、回動軸６ｂの下端部の両側面から互いに反対方向に突設された鉤部６ａとを有している。そして、懸吊部材６は、図示しないクレーン装置により昇降可能にされていると共に、鉤部６ａを係合穴９ａに挿入して回動軸６ｂを回動させることによって、係合部９に対する係合状態と解除状態とを切り換え可能になっている。
【００３０】
図１に示すように、上記のように構成された第１〜第１０蓋部材２ａ〜２ｅ' のうち第２〜第１０蓋部材２ｂ〜２ｅ' は、同一の幅Ｌｂ〜Ｌｅ' に設定されている。一方、第１蓋部材２ａは、他の第２〜第１０蓋部材２ｂ〜２ｅ' の幅Ｌｂ〜Ｌｅ' にズレ量ｄの２倍を加えた幅Ｌａに設定されている。
【００３１】
また、上部層７および下部層８における搬入出口長手方向（第１〜第１０蓋部材２ａ〜２ｅ' の幅方向）の両端部は、貯蔵庫本体１の外周壁３に形成された上支持段３ａおよび下支持段３ｂでそれぞれ支持されている。これらの上支持段３ａおよび下支持段３ｂは、外周壁３の上端面から内側方向に階段状に形成されており、下支持段３ｂの深さは、第１〜第１０蓋部材２ａ〜２ｅ' の厚みに一致するように設定されている。また、下支持段３ｂは、搬入出口１ａの全周に形成されており、下部層８の紙面垂直方向（第１〜第１０蓋部材２ａ〜２ｅ' の長さ方向）の両端部を支持するようになっている。
【００３２】
上記の構成において、貯蔵庫本体１に放射性物質を搬入する際の分割式遮蔽蓋の着脱方法についての例を説明する。
【００３３】
先ず、図６（ａ）に示すように、上部層７の第１蓋部材２ａを抜脱する。即ち、図５（ａ）・（ｂ）に示すように、クレーン装置を遠隔操作し、懸吊部材６を第１蓋部材２ａの上方に位置させ、懸吊部材６の鉤部６ａを係合部９の挿入口９ｂに挿通させる。そして、鉤部６ａが係合穴９ａに進入したときに回動軸６ｂを９０°回動させることによって、懸吊部材６を係合部９に係合させた後、懸吊部材６を介して第１蓋部材２ａを持ち上げて抜脱する。
【００３４】
上記のようにして第１蓋部材２ａを抜脱すると、第１蓋部材２ａを図示しない所定の待機場所に仮置きした後、図６（ｂ）に示すように、第１蓋部材２ａの下方に位置する下部層８の第６蓋部材２ａ' を上記と同様の動作で抜脱することによって、搬入出口１ａの一端側の一部を開口する（仮置き工程）。そして、この開口部を介して放射性物質１０を図示しないクレーン装置により懸吊しながら貯蔵庫本体１内に搬入することによって、開口部の下方に位置する第１収容部▲１▼および第２収容部▲２▼に放射性物質１０をそれぞれ荷積みする（搬入出工程）。
【００３５】
第１収容部▲１▼および第２収容部▲２▼への放射性物質１０の搬入が完了すると、図６（ｃ）に示すように、上部層７に存在する第２蓋部材２ｂを第１および第２収容部▲１▼・▲２▼の上方の下部層８に移載する。この後、図６（ｄ）に示すように、下部層８の第７蓋部材２ｂ' を第２蓋部材２ｂの上面（上部層７）に移載することによって、第３収容部▲３▼および第４収容部▲４▼の上方を開口する（移載工程）。そして、この開口部を介して放射性物質１０を図示しないクレーン装置により懸吊しながら搬入することによって、第３収容部▲３▼および第４収容部▲４▼に放射性物質１０を荷積みする（搬入出工程）。
【００３６】
上記のような上部層７および下部層８の一部を開口する操作を順に繰り返し（反復工程）、最終の第１０収容部(10)への放射性物質１０の荷積みを終了すると、図６（ｅ）に示すように、待機場所に仮置きしていた第６蓋部材２ａ' を下部層８の開口部に移載する。そして、第６蓋部材２ａ' の上面に第１蓋部材２ａを載置することによって、貯蔵庫本体１の搬入出口１ａを塞ぐ（遮蔽工程）。また、図７に示すように、最終の第１０収容部(10)に至るまでの例えば第８収容部▲８▼で放射性物質１０の搬入を中止する場合には、第８収容部▲８▼の上方に位置する開口部を塞ぐように、この開口位置に第６蓋部材２ａ' と第１蓋部材２ａとを移載する（遮蔽工程）。尚、放射性物質１０の搬出は、上述の動作と逆の動作で行うことができるため、その説明を省略する。
【００３７】
以上のように、本実施形態の構成および着脱方法によれば、蓋部材２ａ〜２ｅ' の１個分の開口面積で放射性物質１０を搬入出することができるため、放射線の漏洩を必要最小限に低減することができる。従って、搬入出中にクレーン装置が故障した場合のように、オペレータが放射性雰囲気中で搬入出口１ａを塞ぐ必要が生じた場合において、少なくとも第６蓋部材２ａ' で下部層８の開口部を塞ぐ操作を行えば、放射線の直接的な漏洩を隙間からの漏洩のみに低減することができる。そして、このように低減された放射性雰囲気中で第１蓋部材２ａを第６蓋部材２ａ' に載置する操作を行うことができるため、オペレータの被曝を十分に低減しながら搬入出口１ａを短時間で完全に塞ぐことができる。
【００３８】
尚、第１〜第１０蓋部材２ａ〜２ｅ' は、上述のように第２〜第１０蓋部材２ｂ〜２ｅ' が同一の幅Ｌｂ〜Ｌｅ' に設定されている方が製作上および現場管理上の簡素化の点で望ましいが、下記の条件を満足すれば、任意の幅Ｌａ〜Ｌｅ' を選択することができる。
【００３９】
即ち、第１蓋部材２ａの幅Ｌａが下方に位置する第６蓋部材２ａ' の幅Ｌａ' にズレ量ｄの２倍を加えた長さであるという第１の条件と、Ｌｂ＝Ｌｂ' ，Ｌｃ＝Ｌｃ' ，Ｌｄ＝Ｌｅ' ，Ｌｅ＝Ｌｅ' からなる第２の条件と、第６蓋部材２ａ' の幅Ｌａ' が残りの第２〜第５蓋部材２ｂ〜２ｅの幅Ｌｂ〜Ｌｅに対して同等またはそれ以上に大きな長さであるという第３の条件とを満足していれば、任意の幅Ｌａ〜Ｌｅを選択することができる。ここで、第３の条件を満足する必要がある理由は、図８に示すように、例えば第６蓋部材２ａ' の幅Ｌａ' が第４蓋部材２ｄの幅Ｌｄよりも狭いと、第４蓋部材２ｄを下部層８の開口部に移載することができなくなるからである。
【００４０】
また、本実施形態においては、主蓋部材２１を構成する第１蓋部材２ａと第６蓋部材２ａ' とが個別に形成されているが、クレーン等の取り扱い設備に余裕があれば、一体的に形成されていても良く、この場合には、第１蓋部材２ａと第６蓋部材２ａ' を移載するときの作業を簡単化することができる。
【００４１】
また、本実施形態においては、分割式遮蔽蓋が上部層７と下部層８との２層構造にされているが、これに限定されることもなく、図９（ａ）・（ｂ）に示すように、上部層７、中部層１１および下部層８の３層構造にされていても良い。但し、３層構造の場合には、第１蓋部材２ａの幅Ｌａが下方に位置する第６蓋部材２ａ' の幅Ｌａ' にズレ量ｄの２倍を加えた長さであるという第１の条件と、第６蓋部材２ａ' の幅Ｌａ' が下方に位置する第１１蓋部材２ａ''の幅Ｌａ''にズレ量ｄの２倍を加えた長さであるという第２の条件と、Ｌｂ＝Ｌｂ' ＝Ｌｂ''，Ｌｃ＝Ｌｃ' ＝Ｌｃ''，Ｌｄ＝Ｌｄ' ＝Ｌｄ''，Ｌｅ＝Ｌｅ' ＝Ｌｅ''からなる第３の条件と、第１１蓋部材２ａ''の幅Ｌａ''が第２〜第５蓋部材２ｂ〜２ｅの幅Ｌｂ〜Ｌｅに対して同等またはそれ以上に大きな長さであるという第４の条件とを満足する必要がある。但し、第４の条件は、第１、第６および第１１蓋部材２ａ・２ａ' ・２ａ''以外の幅を全て等しくするのが実用上好ましいものであることは、２層構成の場合と同様である。
【００４２】
〔実施形態２〕
本発明の第２の実施形態を図１０に基づいて以下に説明する。尚、第１の実施形態と同一の部材には、同一の符号を付記してその説明を省略する。
【００４３】
第２の実施形態に係る分割式遮蔽蓋は、図１０（ａ）・（ｂ）に示すように、主蓋部材２１と副蓋部材２２とを有している。主蓋部材２１は、副蓋部材２２の第２〜第５蓋部材２ｂ〜２ｅ等と同一幅で各段部ごとに層状に分割された第１および第６蓋部材２ａ・２ａ' （層状主部材）と、主蓋部材２１から副蓋部材２２の幅を差し引いた逆凸型部材１２とからなっている。逆凸型部材１２は、上部層７に対応する上層部１２ａと、下部層８に対応する下層部１２ｂとからなっており、上層部１２ａは、下層部１２ｂの幅ＬA にズレ量ｄの２倍を加えた幅ＬA ＋２ｄに設定されている。そして、主蓋部材２１の側方には、副蓋部材２２の上部層７に対応する第２〜第５蓋部材２ｂ〜２ｅ（層状副部材）と、副蓋部材２２の下部層８に対応する第７〜第１０蓋部材２ｂ' 〜２ｅ' （層状副部材）とが配置されており、これらの蓋部材２ｂ〜２ｅ' ・２ｂ' 〜２ｅ' は、同一幅に設定されている。その他の構成は、第１の実施形態と同一である。
【００４４】
上記の構成において、貯蔵庫本体１に放射性物質を搬入する際の分割式遮蔽蓋の着脱方法について説明する。
【００４５】
先ず、逆凸型部材１２の図示しない係合部に懸吊部材を係合させた後、逆凸型部材１２を持ち上げて抜脱し、所定の待機場所に仮置きする。続いて、第１蓋部材２ａおよび第６蓋部材２ａ' を抜脱して仮置きすることによって、搬入出口１ａの一端側の一部を開口する（仮置き工程）。この後、この開口部を介して放射性物質１０を図示しないクレーン装置により懸吊しながら貯蔵庫本体１内に搬入することによって、開口部の下方に位置する第１収容部▲１▼および第２収容部▲２▼に放射性物質１０をそれぞれ荷積みする（搬入出工程）。
【００４６】
第１収容部▲１▼および第２収容部▲２▼への放射性物質１０の搬入が完了すると、上部層７に存在する第２蓋部材２ｂを第１および第２収容部▲１▼・▲２▼の上方の下部層８に移載する。この後、下部層８の第７蓋部材２ｂ' を第２蓋部材２ｂの上面（上部層７）に移載することによって、第３収容部▲３▼および第４収容部▲４▼の上方を開口する（移載工程）。そして、この開口部を介して放射性物質１０を図示しないクレーン装置により懸吊しながら搬入することによって、第３収容部▲３▼および第４収容部▲４▼に放射性物質１０を荷積みする（搬入出工程）。
【００４７】
上記のような上部層７および下部層８の一部を開口する操作を順に繰り返し（反復工程）、最終の第１０収容部(10)への放射性物質１０の荷積みを終了すると、待機場所に仮置きしていた第１蓋部材２ａ（または２ａ’）を下部層８の開口部に移載すると共に、第１蓋部材２ａの上面に第６蓋部材２ａ' （または２ａ）を載置する。そして、搬入出口１ａの端部に残った開口部に逆凸型部材１２を移載することによって、搬入出口１ａを塞ぐ（遮蔽工程）。尚、放射性物質１０の搬出は、上述の動作と逆の動作で行うことができるため、その説明を省略する。
【００４８】
以上のように、本実施形態の構成および着脱方法によれば、第１〜第１０蓋部材２ａ〜２ｅ' を同一幅で得ることができるため、第１〜第１０蓋部材２ａ〜２ｅ' を容易に作成することができる。また、放射性物質１０を搬入出する際に必要な開口面積を逆凸型部材１２の幅の変更により設定すれば、第１〜第１０蓋部材２ａ〜２ｅ' の幅（重量）を必要最小限に設定することができるため、懸吊能力の低いクレーン装置を用いて設備コストを低減することができる。
【００４９】
〔実施形態３〕
本発明の第３の実施形態を図１１ないし図１８に基づいて以下に説明する。尚、第１の実施形態と同一の部材には、同一の符号を付記してその説明を省略する。
【００５０】
第３の実施形態に係る分割式遮蔽蓋は、図１１（ａ）に示すように、主蓋部材２１である第１蓋部材１４と、副蓋部材２２である第２〜第５蓋部材１５〜１８を有している。第１蓋部材１４は、図１２（ｂ）に示すように、上面側から下面側にかけて水平幅を所定量単位で減少させるように形成された段部を一端面および他端面にそれぞれ備えた断面逆凸型形状に形成されており、上部１４ａは、下部１４ｂの幅ＬA1にズレ量ｄの２倍を加算した幅ＬA2(＝ＬA1＋２ｄ)に設定されている。
【００５１】
また、第２〜第５蓋部材１５〜１８は、上部１５ａ〜１８ａおよび下部１５ｂ〜１８ｂを有しており、上部１５ａが下部１５ｂに対して水平方向にズレ量ｄ分を変位することによって、上面側から下面側にかけて水平幅を所定量単位で減少および増加させるように形成された段部を一端面および他端面にそれぞれ備えた形状に形成されている。そして、これらの第１〜第５蓋部材１４〜１８は、下部１４ｂ〜１８ｂが同一の厚みＨに設定されていると共に、同一の総厚Ｔに設定されている。
【００５２】
また、分割式遮蔽蓋における搬入出口長手方向の両端部は、図１１（ａ）に示すように、貯蔵庫本体１の外周壁３に形成された上支持段３ａおよび下支持段３ｂでそれぞれ支持されている。これらの上支持段３ａおよび下支持段３ｂは、外周壁３の上端面から内側方向に階段状に形成されている。その他の構成は、第１の実施形態と同一である。
【００５３】
上記の構成において、貯蔵庫本体１に放射性物質を搬入する際の分割式遮蔽蓋の着脱方法について説明する。
【００５４】
先ず、第１蓋部材１４の図示しない係合部に懸吊部材を係合させた後、第１蓋部材１４をクレーン装置により持ち上げて抜脱し、所定の待機場所に仮置きすることによって、図１１（ｂ）に示すように、搬入出口１ａの一端側の一部を開口する（仮置き工程）。この後、この開口部を介して放射性物質１０を図示しないクレーン装置により懸吊しながら貯蔵庫本体１内に搬入することによって、開口部の下方に位置する第１収容部▲１▼および第２収容部▲２▼に放射性物質１０をそれぞれ荷積みする（搬入出工程）。
【００５５】
次に、図１１（ｃ）に示すように、第２蓋部材１５をクレーン装置により上方に持ち上げて１８０°水平面で旋回させた後、第１および第２収容部▲１▼・▲２▼の上方に移載することによって、第３収容部▲３▼および第４収容部▲４▼の上方を開口する（旋回移載工程）。そして、この開口部を介して放射性物質１０を図示しないクレーン装置により懸吊しながら搬入することによって、第３収容部▲３▼および第４収容部▲４▼に放射性物質１０を荷積みする（搬入出工程）。
【００５６】
上記のような搬入出口１ａの一部を開口する操作を順に繰り返し（反復工程）、最終の第１０収容部(10)への放射性物質１０の荷積みを終了すると、図１１（ｄ）に示すように、待機場所に仮置きしていた第１蓋部材１４を第１０収容部(10)の上方の開口位置に移載することにより開口部を塞ぐ（遮蔽工程）。また、図１３に示すように、最終の第１０収容部(10)に至るまでの例えば第７収容部▲７▼で放射性物質１０の搬入を中止する場合には、第７収容部▲７▼の上方の開口位置に第１蓋部材１４を移載することにより開口部を塞ぐ（遮蔽工程）。尚、放射性物質１０の搬出は、上述の動作と逆の動作で行うことができるため、その説明を省略する。
【００５７】
以上のように、本実施形態の構成および着脱方法によれば、第１の実施形態のように蓋部材１４〜１８を複数層に分割せずに単一層とできるため、下記の３利点が生じる。即ち、▲１▼取り扱いが簡単（上下２層の２回ハンドリングを１回にできる。）▲２▼蓋部材の断面係数、断面二次モーメントが大きくなるため、強度上の制約が少なくなり、各蓋部材１４〜１８の総厚Ｔを遮蔽上の必要最小限に抑制して分割式遮蔽蓋の軽量化を図れる場合もある。さらに、▲３▼蓋部材１４〜１８同士を積層する必要がないため、蓋部材１４〜１８の懸吊に使用される係合部を上面から突出した簡単な構成にすることができる。
【００５８】
尚、本実施形態においては、図１４（ａ）に示すように、搬入出口長手方向の外周壁３の上支持段３ａおよび下支持段３ｂにより各蓋部材１４〜１８の上部１４ａ〜１８ａおよび下部１４ｂ〜１８ｂをそれぞれ支持可能な構成にされているが、遮蔽性能が担保できれば、これに限定されることはない。即ち、図１４（ｂ）に示すように、外周壁３上端の内側に一つ形成された支持段３ｃで各蓋部材１４〜１８の上部１４ａ〜１８ａを支持するように構成されていても良いし、図１４（ｃ）に示すように、外周壁３の上端面で各蓋部材１４〜１８の上部１４ａ〜１８ａを支持するように構成されていても良い。
【００５９】
また、本実施形態においては、各蓋部材１４〜１８が上部１４ａ〜１８ａおよび下部１４ｂ〜１８ｂの２層構造にされているが、これに限定されることもなく、図１５（ａ）・（ｂ）に示すように、３層構造であっても良い。また、本実施形態の各蓋部材１４〜１８は、図１６（ａ）に示すように、幅方向の両端面が上面および下面に対して垂直方向に曲折されていても良いし、図１６（ｂ）・（ｃ）に示すように、幅方向の両端面が上面および下面に対して所定の傾斜角度θで曲折されていても良い。尚、一般的には、▲１▼装着時に傾斜面がガイドとなって装着が容易化すると共に、▲２▼有効遮蔽厚が図１６（ｂ）・（ｃ）に示すように垂直の場合よりも大きくとることができることから、傾斜されている場合が多い。
【００６０】
さらに、本実施形態においては、図１２（ｂ）に示すように、上部１４ａと下部１４ｂとを一体化して第１蓋部材１４が形成されているが、これに限定されることもない。即ち、第１蓋部材１４は、必要により第１蓋部材１４の上部１４ａと下部１４ｂとを上下方向に２分割することによって、図１７（ａ）・（ｂ）に示すように、上部材１９ａと下部材１９ｂとに別体化した状態で第１蓋部材１９が形成されていても良い。また、第１蓋部材１４は、図１８（ａ）・（ｂ）に示すように、他の第２〜第５蓋部材１５〜１８と同一形状に形成した第１部材２０ｂと、第１蓋部材１４から第１部材２０ｂを差し引いた断面逆凸型形状の逆凸型部材２０ａとに２分割した構成を有する第１蓋部材２０とされていても良い。そして、これらの構成の場合には、第１蓋部材１９の重量が上部材１９ａ（逆凸型部材２０ａ）と下部材１９ｂ（第１部材２０ｂ）とに分散され、各部材１９ａ・１９ｂ（２０ａ・２０ｂ）を他の第２〜第５蓋部材１５〜１８よりも軽量化することができるため、第２〜第５蓋部材１５〜１８に対応したクレーン装置を採用することができる。
【００６１】
〔実施形態４〕
本発明の第４の実施形態を図１９ないし図２４に基づいて以下に説明する。尚、第３の実施形態と同一の部材には、同一の符号を付記してその説明を省略する。
【００６２】
第４の実施形態に係る分割式遮蔽蓋は、図２２（ａ）に示すように、上部１４ａおよび下部１４ｂを有した断面逆凸型形状の主蓋部材２１である第１蓋部材１４と、上部１５ａ〜１８ａと下部１５ｂ〜１８ｂとが水平方向に変位された副蓋部材２２である第２〜第５蓋部材１５〜１８とを一組として有している。第１蓋部材１４の下部１４ｂは、第２〜第５蓋部材１５〜１８の下部１５ｂ〜１８ｂと同等若しくは広い幅に設定されている。そして、各分割式遮蔽蓋は、ピット式やサイロ式等の貯蔵庫本体１に形成された複数の例えば第１〜第３搬入出口１ａ・１ａ' ・１ａ''をそれぞれ塞いでいる。
【００６３】
上記の第１〜第３搬入出口１ａ・１ａ' ・１ａ''は、図１９に示すように、搬入出口幅方向（各蓋部材１４〜１８の長手方向）に配列されている（但し、図２０に示すような各蓋部材１４〜１８の幅方向である搬入出口長手方向の配列でも同様である）。第１搬入出口１ａを塞ぐ分割式遮蔽蓋は、搬入開始前においては図中左端位置に第１蓋部材１４を配置し、この第１蓋部材１４から第２〜第５蓋部材１５〜１８を図中右側に順に配列した正配列の構成にされている。一方、第２および第３搬入出口１ａ' ・１ａ''を塞ぐ分割式遮蔽蓋は、第１搬入出口１ａを塞ぐ分割式遮蔽蓋とは逆方向に図中右側から左側に各蓋部材１４〜１８を配列した逆配列の構成にされている。尚、図示しない以降の搬入出口は、上記の逆配列の構成の分割式遮蔽蓋で塞がれている。尚、副蓋部材２２は、全て同一形状とし、正配列のときと逆配列のときとでは１８０°回転させた状態で設置する。また、分割式遮蔽蓋における搬入出口長手方向の両端部は、図２２（ａ）に示すように、貯蔵庫本体１の外周壁３に形成された支持段３ｃでそれぞれ支持されている。その他の構成は、第３の実施形態と同一である。
【００６４】
上記の構成において、貯蔵庫本体１に放射性物質を搬入する際の分割式遮蔽蓋の着脱方法について説明する。
【００６５】
放射性物質１０の搬入開始前においては、図１９および図２２（ａ）に示すように、全ての第１〜第３搬入出口１ａ・１ａ' ・１ａ''が分割式遮蔽蓋により塞がれた状態にされている。そして、放射性物質１０を搬入する場合には、先ず、第１搬入出口１ａを塞いでいる分割式遮蔽蓋の第１蓋部材１４をクレーン装置により持ち上げて抜脱し、所定の待機場所に仮置きすると共に、同様の操作により第２搬入出口１ａ' の第１蓋部材１４' を抜脱して仮置きすることによって、図２２（ｂ）に示すように、第１搬入出口１ａの図中左端部分と第２搬入出口１ａ' の図中右端部分とを開口する（仮置き工程）。そして、第１搬入出口１ａの開口部を介して放射性物質１０を搬入する（搬入出工程）。
【００６６】
次に、図２２（ｃ）に示すように、第２搬入出口１ａ' の第２蓋部材１５' をクレーン装置により上方に持ち上げ、第１搬入出口１ａの開口部方向に水平移動させた後、第１搬入出口１ａの開口部に載置する。この際、第１搬入出口１ａの支持段３ｃと第２蓋部材１５' の端部との形状が一致するため、第２蓋部材１５' を旋回させる必要がない。この後、図２２（ｄ）に示すように、第１搬入出口１ａの第２蓋部材１５をクレーン装置により上方に持ち上げ、第２搬入出口１ａ' の開口部方向に水平移動させた後、第２搬入出口１ａ' の開口部に載置する。尚、この場合においても、第２搬入出口１ａ' の支持段３ｃと第２蓋部材１５の端部との形状が一致するため、第２蓋部材１５を旋回させる必要がない（移載工程）。そして、このようにして第１搬入出口１ａにおける第２蓋部材１５' と第３蓋部材１６との間に開口部が出現すると、この開口部を介して放射性物質１０を搬入する（搬入出工程）。
【００６７】
この後、図２２（ｅ）に示すように、第１搬入出口１ａの第３蓋部材１６を第２搬入出口１ａ' の第２蓋部材１５の側方に移載すると共に、第２搬入出口１ａ' の第３蓋部材１６' を第１搬入出口１ａの第２蓋部材１５' の側方に移載することによって、第１搬入出口１ａに新たな開口部を出現させ、この開口部を介して放射性物質１０を搬入する。そして、このような操作を順に繰り返すことによって（反復工程）、第１搬入出口１ａに対して放射性物質１０を搬入する。そして、放射性物質１０が満杯になる等により第１搬入出口１ａに対する搬入を終了した後、続いて第２貯蔵庫に対する放射性物質１０の搬入を行う場合には、図２１に示すように、第１搬入出口１ａの図中右側の開口部に第３搬入出口１ａ''の第１蓋部材１４''を移載する（別庫移行工程）。
【００６８】
この後、図２３に示すように、以上のような第１搬入出口１ａと第２搬入出口１ａ' との間における操作を、第２搬入出口１ａ' と第３搬入出口１ａ''との間においても同様に行うことによって、第２搬入出口１ａ' における放射性物質１０の搬入を行う。また、例えば第２搬入出口１ａ' における放射性物質１０の搬入を途中で中止する場合には、図２４に示すように、第１搬入出口１ａの開口部に図示しない待機場所に仮置きしていた第１蓋部材１４を移載することにより開口を塞ぐことができる（遮蔽工程）。
【００６９】
以上のように、本実施形態の構成および着脱方法によれば、各蓋部材１４〜１８を旋回させることなく第１〜第３搬入出口１ａ・１ａ' ・１ａ''に開口部を順次出現させ、開口部を介して放射性物質１０を搬入することが可能であるため、クレーン装置に旋回機構を設ける必要がなく、ひいては装置コストを低減することが可能になっている。
【００７０】
〔実施形態５〕
本発明の第５の実施形態を図２５ないし図３３に基づいて以下に説明する。尚、第４の実施形態と同一の部材には、同一の符号を付記してその説明を省略する。
【００７１】
第５の実施形態に係る分割式遮蔽蓋は、図２５に示すように、ピット式やサイロ式等の貯蔵庫本体１の搬入出口幅方向（第１〜第１０蓋部材２ａ〜２ｅ' の長手方向）に形成された複数の例えば第１〜第４搬入出口１ａ・１ａ' ・１ａ''・１ａ''''をそれぞれ塞いでいる。そして、正配列の分割式遮蔽蓋と逆配列の分割式遮蔽蓋とが交互に配置されることによって、第１搬入出口１ａおよび第３搬入出口１ａ''等の奇数番目の搬入出口が正配列の分割式遮蔽蓋で塞がれている一方、第２搬入出口１ａ' および第４搬入出口１ａ''' 等の偶数番目の搬入出口が逆配列の分割式遮蔽蓋で塞がれている。その他の構成は、第４の実施形態と同一である。
【００７２】
尚、本実施形態においては、正配列の分割式遮蔽蓋と逆配列の分割式遮蔽蓋とが１列づつ交互に配置された形態にされているが、これに限定されることはなく、例えば図２６に示すように、正配列の分割式遮蔽蓋と逆配列の分割式遮蔽蓋とが２列等の複数列ごとに交互に配置された形態にされていても良い。さらに、例えば図２７に示すように、複数の例えば第１〜第４搬入出口１ａ・１ａ' ・１ａ''・１ａ''''が貯蔵庫本体１の搬入出口長手方向に形成されている場合において、分割式遮蔽蓋が上記の１列や複数列ごとに交互に配置された形態にされていても良い。
【００７３】
上記の構成において、貯蔵庫本体１に放射性物質を搬入する際の分割式遮蔽蓋の着脱方法について説明する。
【００７４】
放射性物質１０の搬入開始前においては、図２５および図２９（ａ）に示すように、全ての第１〜第４搬入出口１ａ・１ａ' ・１ａ''・１ａ''''が分割式遮蔽蓋により塞がれた状態にされている。そして、放射性物質１０を搬入する場合には、先ず、第１搬入出口１ａを塞いでいる分割式遮蔽蓋の第１蓋部材１４をクレーン装置により持ち上げて抜脱し、所定の待機場所に仮置きすると共に、同様の操作により第２搬入出口１ａ' の第１蓋部材１４' を抜脱して仮置きすることによって、図２９（ｂ）に示すように、第１搬入出口１ａの図中左端部分と第２搬入出口１ａ' の図中右端部分とを開口する（仮置き工程）。そして、これらの第１搬入出口１ａの開口部を介して放射性物質１０を搬入する（第１搬入出口工程）。
【００７５】
次に、図２９（ｃ）に示すように、第２搬入出口１ａ' の第２蓋部材１５' をクレーン装置により上方に持ち上げ、第１搬入出口１ａの開口部方向に水平移動させた後、第１搬入出口１ａの開口部に載置する（第１移載工程）。そして、第２蓋部材１５' の抜脱により拡大した第２搬入出口１ａ' の開口部を介して放射性物質１０を搬入する（第２搬入出工程）。この後、図２９（ｄ）に示すように、第１搬入出口１ａの第２蓋部材１５をクレーン装置により第２搬入出口１ａ' の開口部に移載し（第２移載工程）、第１搬入出口１ａにおける第２蓋部材１５' と第３蓋部材１６との間に出現した開口部を介して放射性物質１０を搬入する（第１搬入出工程）。
【００７６】
次に、図３０（ａ）に示すように、第１搬入出口１ａの第３蓋部材１６を第２搬入出口１ａ' の開口部に移載することによって、第３蓋部材１６の抜脱により拡大した第１搬入出口１ａの開口部を介して放射性物質１０を搬入し、さらに、第２搬入出口１ａ' の第３蓋部材１６' を第１搬入出口１ａの開口部に移載することによって、第３蓋部材１６' の抜脱により拡大した第２搬入出口１ａ' の開口部を介して放射性物質１０を搬入する。そして、このような操作を順に繰り返し（反復工程）、最後に第１蓋部材１４・１４’で塞ぐことによって、図３０（ｂ）および図２８に示すように、第１搬入出口１ａおよび第２搬入出口１ａ' における放射性物質１０の搬入を同時に行うことができる。また、作業を途中で中断する場合には、その時点で第１蓋部材１４・１４’で塞げば良いことは他の実施形態と同様である。
【００７７】
尚、本実施形態の着脱方法は、一体的に形成された第１蓋部材１４を備えた分割式遮蔽蓋に適用した場合ついて説明しているが、例えば図１８（ａ）・（ｂ）に示すように、第１部材２０ｂと逆凸型部材２０ａとに２分割した構成の第１蓋部材２０を備えた分割式遮蔽蓋に適用することもできる。即ち、第１蓋部材２０の第１部材２０ｂが他の第２〜第５蓋部材１５〜１８と同一形状に形成されているため、先ず、仮置き工程において逆凸型部材２０ａを仮置きし、次いで第１および第２移載工程において逆凸型部材２０ａを第２〜第５蓋部材１５〜１８と同様に移載することによって、放射性物質１０を搬入することができる。
【００７８】
また、放射性物質１０が放射性廃棄物である場合には、形状が規格化され、整然と並べられて貯蔵される例が多い。従って、図３１に示すように、同一幅寸法Ｐの放射性物質１０を貯蔵対象として貯蔵庫内で等間隔に配置する場合においては、下記の条件式（１）〜（３）を満足した関係であることが望ましい。そして、これらの条件式（１）〜（３）を満足すれば、▲１▼分割式遮蔽蓋の製作上および荷役作業管理上の容易化を実現することができると共に、▲２▼放射性物質１０の搬入出時において、開口部の端面（各蓋部材１４〜１８の端面）に対して適度な隙間（荷積みされた放射性物質１０間の間隔ｃ以上）を保持したまま放射性物質１０を昇降させることができる。
【００７９】
ＬＡ≧ＬＢ＋ｅ＋ｆ ・・・（１）
ＬＢ≧ｍ（Ｐ＋ｃ） ・・・（２）
ＬＡ＋（Ｎ−１）ＬＢ＝Ｗ＋２ｆ ・・・（３）
【００８０】
但し、
Ｗ：搬入出口の幅
ｅ：搬入出口の端面から前記放射性物質の最外面までの距離
Ｐ：放射性物質１０の幅Ｐ
ｃ：放射性物質１０の隙間
ｆ：搬入出口の蓋部材下面の支持幅
ＬＡ：主蓋部材の下面幅
（尚、図１７の第１蓋部材１９にあっては下部材１９ｂの幅）
ＬＢ：副蓋部材の下面幅
ｍ：副蓋部材の下面幅で設置可能な放射性物質１０の数量
Ｎ：主蓋部材および副蓋部材からなる蓋部材による分割数（主蓋部材および副蓋部材の合計）
である。
【００８１】
尚、分割式遮蔽蓋が条件式（１）〜（３）を満足しない場合には、例えば図３３に示す場合は、第２収容部▲２▼の放射性物質１０に対して搬入出しようとしたときに、ア段階ではＢ１蓋部材の左側端と干渉し、イ段階ではｂ１蓋部材の右側端と干渉する。従って、この第２収容部▲２▼において搬入出しようとすると、主蓋部材および副蓋部材を外すか干渉箇所を避けながら昇降させる必要が生じることになる。
【００８２】
さらに、図３２に示すように、分割式遮蔽蓋が主蓋部材（底面幅：ＬＡ）を逆凸型部材ＡＯ（底面幅：ＬＡ０）と第１部材ＢＡ（底面幅：ＬＢＡ）とに分割した場合には、条件式（１）〜（３）に加えて下記の条件式（４）・（５）を満足すれば、上述の場合と同様に、分割式遮蔽蓋の製作上および荷役作業管理上の容易化を実現することができると共に、放射性物質１０の搬入出時において、開口部の端面（各蓋部材１４〜１８の端面）に対して適度な隙間（荷積みされた放射性物質１０間の間隔ｃ以上）を保持したまま放射性物質１０を昇降させることができる。
【００８３】
ＬＢＡ＝ＬＢ ・・・（４）
ＬＡ＝ＬＡＯ＋ＬＢＡ ・・・（５）
尚、以上の全般の説明において、接合面は垂直としたが、実際は、▲１▼蓋部材の着脱が容易となること、▲２▼接合面の遮蔽欠損を補うことを目的として、図１６（ｂ）・（ｃ）および図３２に例示するように、接合面を傾斜させる場合にも適用できのは当然である。
【００９３】
【発明の効果】
請求項１の発明は、上面側から下面側にかけて水平幅を所定量単位で減少させるように形成された段部を一端面および他端面にそれぞれ備えた主蓋部材と、上面側から下面側にかけて水平幅を所定量単位で減少および増加させるように形成された段部を一端面および他端面にそれぞれ備えた複数の副蓋部材とを有し、これら主蓋部材および副蓋部材を段部同士を重複させながら配列することにより貯蔵庫本体の搬入出口を塞ぐ分割式遮蔽蓋の着脱方法であって、前記主蓋部材は、各段部ごとに層状に分割された層状主部材からなり、前記副蓋部材は、各副蓋部材を構成する各段部が一体的に結合されており、前記主蓋部材を抜脱して待機位置に仮置きすることによって、該主蓋部材の抜脱位置に開口部を形成する仮置き工程と、前記開口部を介して貯蔵庫本体に対する放射性物質の搬入出を行う搬入出工程と、前記開口部に隣接する副蓋部材を抜脱して水平面で旋回した後、該開口部に移載して新たな開口部を形成する旋回移載工程と、前記搬入出工程と前記旋回移載工程とを搬入出の終了または中断まで繰り返す反復工程と、前記反復工程後に前記待機位置の主蓋部材を前記開口部に移載する遮蔽工程とを有する構成である。
また、請求項２の発明は、上面側から下面側にかけて水平幅を所定量単位で減少させるように形成された段部を一端面および他端面にそれぞれ備えた主蓋部材と、上面側から下面側にかけて水平幅を所定量単位で減少および増加させるように形成された段部を一端面および他端面にそれぞれ備えた複数の副蓋部材とを有し、これら主蓋部材および副蓋部材を段部同士を重複させながら配列することにより貯蔵庫本体の搬入出口を塞ぐ分割式遮蔽蓋の着脱方法であって、前記主蓋部材は、前記副蓋部材と同一形状に形成された第１部材と、前記主蓋部材から前記第１部材の幅を差し引いた逆凸型部材とからなり、前記副蓋部材は、各副蓋部材を構成する各段部が一体的に結合されており、前記主蓋部材を抜脱して待機位置に仮置きすることによって、該主蓋部材の抜脱位置に開口部を形成する仮置き工程と、前記開口部を介して貯蔵庫本体に対する放射性物質の搬入出を行う搬入出工程と、前記開口部に隣接する副蓋部材を抜脱して水平面で旋回した後、該開口部に移載して新たな開口部を形成する旋回移載工程と、前記搬入出工程と前記旋回移載工程とを搬入出の終了または中断まで繰り返す反復工程と、前記反復工程後に前記待機位置の主蓋部材を前記開口部に移載する遮蔽工程とを有する構成である。
上記の構成によれば、主蓋部材や副蓋部材のサイズに対応した開口部を順次形成しながら放射性物質の搬入出を行うことができるため、搬入出口の開口面積を必要最小限に抑制することにより放射線の漏洩を十分に低減することができる。しかも、単一開口毎に実施でき、蓋の仮置き場所も主蓋部材用のスペースのみで済むという効果を奏する。
【００９４】
請求項３の発明は、分割式遮蔽蓋の着脱方法であって、上面側から下面側にかけて水平幅を所定量単位で減少させるように形成された段部を一端面および他端面にそれぞれ備えた主蓋部材と、上面側から下面側にかけて水平幅を所定量単位で減少および増加させるように形成された段部を一端面および他端面にそれぞれ備えた複数の副蓋部材とを有し、これら主蓋部材および副蓋部材を段部同士を重複させながら配列することにより貯蔵庫本体の搬入出口を塞ぐ分割式遮蔽蓋の着脱方法であって、前記主蓋部材を抜脱して待機位置に仮置きすることによって、該主蓋部材の抜脱位置に開口部を形成する仮置き工程と、前記開口部を介して貯蔵庫本体に対する放射性物質の搬入出を行う搬入出工程と、前記開口部に隣接する副蓋部材を抜脱して水平面で旋回した後、該開口部に移載して新たな開口部を形成する旋回移載工程と、前記搬入出工程と前記旋回移載工程とを搬入出の終了または中断まで繰り返す反復工程と、前記反復工程後に前記待機位置の主蓋部材を前記開口部に移載する遮蔽工程とを有する構成である。
上記の構成によれば、主蓋部材や副蓋部材のサイズに対応した開口部を順次形成しながら放射性物質の搬入出を行うことができるため、搬入出口の開口面積を必要最小限に抑制することにより放射線の漏洩を十分に低減することができる。しかも、単一開口毎に実施でき、蓋の仮置き場所も主蓋部材用のスペースのみで済むという効果を奏する。
【００９５】
請求項４の発明は、分割式遮蔽蓋の着脱方法であって、上面側から下面側にかけて水平幅を所定量単位で減少させるように形成された段部を一端面および他端面にそれぞれ備えた主蓋部材と、上面側から下面側にかけて水平幅を所定量単位で減少および増加させるように形成された段部を一端面および他端面にそれぞれ備えた複数の副蓋部材とを有し、これら主蓋部材および副蓋部材を段部同士を重複させながら配列することにより貯蔵庫本体の搬入出口を塞ぐ分割式遮蔽蓋の着脱方法であって、前記貯蔵庫本体には、前記主蓋部材が一端側に位置するように正方向に配列された分割式遮蔽蓋で塞がれた第１搬入出口と、前記主蓋部材が他端側に位置するように逆方向に配列された分割式遮蔽蓋で塞がれた複数の第２搬入出口とが、同一寸法で搬入出口長手方向か搬入出口幅方向の何れかの方向に並列配置されており、前記第１搬入出口および特定の第２搬入出口の主蓋部材をそれぞれ抜脱して待機位置に仮置きすることによって、各主蓋部材の抜脱位置に開口部を形成する仮置き工程と、前記第１搬入出口の開口部を介して貯蔵庫本体に対する放射性物質の搬入出を行う搬入出工程と、前記第１搬入出口および前記第２搬入出口の開口部に隣接する副蓋部材をそれぞれ抜脱し、前記第２搬入出口および第１搬入出口の開口部にそれぞれ移載して新たな開口部を形成する移載工程と、前記搬入出工程と前記移載工程とを搬入出の終了または中断まで繰り返す反復工程と、前記反復工程において第１搬入出口の開口位置が最端部まで移動した後に、前記第１搬入出口の開口部に次の第２搬入出口の主蓋部材を移載し、前記特定の第２搬入出口を第１搬入出口とし、前記次の第２搬入出口を特定の第２搬入出口とした後、これら新たな第１搬入出口と第２搬入出口との間で前記反復工程を行う別庫移行工程と、前記反復工程後に、前記待機位置の主蓋部材を前記第１搬入出口および第２搬入出口の開口部にそれぞれ移載する遮蔽工程とを有する構成である。
上記の構成によれば、主蓋部材や副蓋部材のサイズに対応した開口部を順次形成しながら放射性物質の搬入出を行うことができるため、搬入出口の開口面積を必要最小限に抑制することにより放射線の漏洩を十分に低減することができる。また、請求項１乃至請求項３の場合のように副蓋部材を水平面で旋回させるための旋回装置を不要にすることができる。さらに、第１搬入出口と第２搬入出口との間で行われる反復工程を、別庫となる新たな第１搬入出口と第２搬入出口との間に移行する際の主蓋部材の着脱操作を少なくすることができるという効果を奏する。
【００９６】
請求項５の発明は、分割式遮蔽蓋の着脱方法であって、上面側から下面側にかけて水平幅を所定量単位で減少させるように形成された段部を一端面および他端面にそれぞれ備えた主蓋部材と、上面側から下面側にかけて水平幅を所定量単位で減少および増加させるように形成された段部を一端面および他端面にそれぞれ備えた複数の副蓋部材とを有し、これら主蓋部材および副蓋部材を段部同士を重複させながら配列することにより貯蔵庫本体の搬入出口を塞ぐ分割式遮蔽蓋の着脱方法であって、前記貯蔵庫本体には、前記主蓋部材が一端側に位置するように正方向に配列された分割式遮蔽蓋で塞がれた第１搬入出口と、前記主蓋部材が他端側に位置するように逆方向に配列された分割式遮蔽蓋で塞がれた第２搬入出口とを一組とする複数組が、同一寸法で搬入出口長手方向か搬入出口幅方向の何れかの方向に並列配置されており、前記複数組中の特定組における第１搬入出口および第２搬入出口の主蓋部材をそれぞれ抜脱して待機位置に仮置きすることによって、各主蓋部材の抜脱位置に開口部を形成する仮置き工程と、前記第１搬入出口の開口部を介して貯蔵庫本体に対する放射性物質の搬入出を行う第１搬入出工程と、前記第２搬入出口の開口部に隣接する副蓋部材を抜脱し、前記第１搬入出口の開口部に移載して新たな開口部を第２搬入出口に形成する第１移載工程と、前記第２搬入出口の開口部を介して貯蔵庫本体に対する放射性物質の搬入出を行う第２搬入出工程と、前記第１搬入出口の開口部に隣接する副蓋部材を抜脱し、前記第２搬入出口の開口部に移載して新たな開口部を第１搬入出口に形成する第２移載工程と、前記第１搬入出工程、前記第１移載工程、前記第２搬入出工程および前記第２移載工程を搬入出の終了または中断まで繰り返す反復工程と、前記反復工程後に前記待機位置の主蓋部材を前記第１搬入出口および第２搬入出口の開口部にそれぞれ移載する遮蔽工程とを有する構成である。さらに、反復工程中、第１搬入出口と第２搬入出口とが端部まで移動し、さらに継続して作業する場合、他の組の主蓋部材を用いて第１および第２搬入出口を閉じ、新たな組の貯蔵庫に開口を設ける別庫移行もできる。尚、第１移載工程と第２移載工程は、順序を逆にしても支障はない。
上記の構成によれば、請求項４の場合よりも少ない蓋部材の着脱操作回数で放射性物質の搬入出を行うことが可能になり、主蓋部材や副蓋部材のサイズに対応した開口部を順次形成しながら放射性物質の搬入出を行うことができるため、搬入出口の開口面積を必要最小限に抑制することにより放射線の漏洩を十分に低減することができるという効果を奏する。
【００９７】
請求項６の発明は、分割式遮蔽蓋の着脱方法であって、上面側から下面側にかけて水平幅を所定量単位で減少させるように形成された段部を一端面および他端面にそれぞれ備えた主蓋部材と、上面側から下面側にかけて水平幅を所定量単位で減少および増加させるように形成された段部を一端面および他端面にそれぞれ備えた複数の副蓋部材とを有し、これら主蓋部材および副蓋部材を段部同士を重複させながら配列することにより貯蔵庫本体の搬入出口を塞ぐ分割式遮蔽蓋の着脱方法であって、前記主蓋部材は、前記副蓋部材と同一形状に形成された第１部材と、前記主蓋部材から前記第１部材の幅を差し引いた逆凸型部材とからなり、前記副蓋部材は、各副蓋部材を構成する各段部が一体的に結合されており、前記貯蔵庫本体には、前記主蓋部材が一端側に位置するように正方向に配列された分割式遮蔽蓋で塞がれた第１搬入出口と、前記主蓋部材が他端側に位置するように逆方向に配列された分割式遮蔽蓋で塞がれた第２搬入出口とを一組とする複数組が、同一寸法で搬入出口長手方向か搬入出口幅方向の何れかの方向に並列配置されており、前記複数組中の特定組における第１搬入出口および第２搬入出口の逆凸型部材および第１搬入出口の第１部材をそれぞれ抜脱して待機位置に仮置きすることによって、第１搬入出口に放射性物質の搬入出を可能とする開口部を形成する仮置き工程と、前記第１搬入出口の開口部を介して貯蔵庫本体に対する放射性物質の搬入出を行う第１搬入出工程と、前記第２搬入出口の開口部に隣接する第１部材または副蓋部材を抜脱し、前記第１搬入出口の開口部に移載して新たな開口部を第２搬入出口に形成する第１移載工程と、前記第２搬入出口の開口部を介して貯蔵庫本体に対する放射性物質の搬入出を行う第２搬入出工程と、前記第１搬入出口の開口部に隣接する副蓋部材を抜脱し、前記第２搬入出口の開口部に移載して新たな開口部を第１搬入出口に形成する第２移載工程と、前記第１搬入出工程、前記第１移載工程、前記第２搬入出工程および前記第２移載工程を搬入出の終了または中断まで繰り返す反復工程と、前記反復工程後に前記待機位置の主蓋部材を前記第１搬入出口および第２搬入出口の開口部にそれぞれ移載する遮蔽工程とを有する構成である。
上記の構成によれば、別庫移行工程も請求項５に説明した方法に準じて実施でき、請求項４の場合よりも少ない蓋部材の着脱操作回数で放射性物質の搬入出が可能になり、主蓋部材や副蓋部材のサイズに対応した請求項５より少ない開口部を順次形成しながら放射性物質の搬入出を行うことができるため、搬入出口の開口面積を必要最小限に抑制することにより放射線の漏洩を十分に低減することができるという効果を奏する。
【図面の簡単な説明】
【図１】分割式遮蔽蓋の基本構造を示す説明図である。
【図２】ピット式貯蔵庫本体の斜視図である。
【図３】サイロ式貯蔵庫本体の斜視図である。
【図４】蓋部材の係合部の例を示す図であり、（ａ）は平面図、（ｂ）はＡ−Ａ線矢視断面図、（ｃ）はＢ−Ｂ線矢視断面図である。
【図５】懸吊部材が係合部に係合する状態の例を示す図であり、（ａ）は正面図、（ｂ）は側面図である。
【図６】放射性物質の基本的な搬入過程を示す説明図であり、（ａ）は搬入開始前の状態、（ｂ）は搬入開始直後の状態、（ｃ）は新たな開口部を形成する状態、（ｄ）は新たな開口部を介して搬入する状態、（ｅ）は搬入を完了した状態である。
【図７】分割式遮蔽蓋を搬入途中で塞ぐ状態を示す説明図である。
【図８】分割式遮蔽蓋の不具合を示す説明図である。
【図９】分割式遮蔽蓋の構成図であり、（ａ）は搬入開始前、（ｂ）は搬入完了後である。
【図１０】分割式遮蔽蓋の構成図であり、（ａ）は搬入開始前、（ｂ）は搬入完了後である。
【図１１】放射性物質の搬入過程を示す説明図であり、（ａ）は搬入開始前の状態、（ｂ）は搬入開始直後の状態、（ｃ）は新たな開口部を介して搬入する状態、（ｄ）は搬入を完了した状態である。
【図１２】蓋部材の正面図であり、（ａ）は副蓋部材の正面図、（ｂ）は主蓋部材の正面図である。
【図１３】分割式遮蔽蓋を搬入途中で塞ぐ状態を示す説明図である。
【図１４】段部の態様を示す説明図である。
【図１５】分割式遮蔽蓋の構成図であり、（ａ）は搬入開始前、（ｂ）は搬入完了後である。
【図１６】段部の態様を示す説明図である。
【図１７】分割式遮蔽蓋の構成図であり、（ａ）は搬入開始前、（ｂ）は搬入完了後である。
【図１８】分割式遮蔽蓋の構成図であり、（ａ）は搬入開始前、（ｂ）は搬入完了後である。
【図１９】分割式遮蔽蓋における搬入出口幅方向の配列状態を示す説明図である。
【図２０】分割式遮蔽蓋における搬入出口長手方向の配列状態を示す説明図である。
【図２１】分割式遮蔽蓋の配列状態を示す説明図である。
【図２２】放射性物質の搬入過程を示す説明図であり、（ａ）は搬入開始前の状態、（ｂ）は搬入開始直後の状態、（ｃ）は新たな開口部を形成する状態、（ｄ）は新たな開口部を介して搬入する状態、（ｅ）は新たな次の開口部を介して搬入する状態である。
【図２３】放射性物質の搬入の過程を示す説明図である。
【図２４】分割式遮蔽蓋を搬入途中で塞ぐ状態を示す説明図である。
【図２５】分割式遮蔽蓋の配列状態を示す説明図である。
【図２６】分割式遮蔽蓋の配列状態を示す説明図である。
【図２７】分割式遮蔽蓋の配列状態を示す説明図である。
【図２８】分割式遮蔽蓋の配列状態を示す説明図である。
【図２９】放射性物質の搬入過程を示す説明図であり、（ａ）は搬入開始前の状態、（ｂ）は搬入開始直後の状態、（ｃ）は新たな開口部を介して搬入する状態、（ｄ）は新たな次の開口部を介して搬入する状態である。
【図３０】放射性物質の搬入過程を示す説明図であり、（ａ）は開口部を介して搬入する状態、（ｂ）は搬入を完了した状態である。
【図３１】分割式遮蔽蓋の各蓋部材のサイズおよび放射性物質のサイズの関係を示す説明図である。
【図３２】接合面に傾斜を持たせ且つ主蓋部材を分割した場合の分割式遮蔽蓋の各蓋部材のサイズおよび放射性物質のサイズの関係を示す説明図である。
【図３３】分割式遮蔽蓋の各蓋部材のサイズおよび放射性物質のサイズの関係を示す説明図である。
【図３４】従来の分割式遮蔽蓋の構造を示す図であり、（ａ）は平面図、（ｂ）はＹ−Ｙ線矢視断面図、（ｃ）はＸ−Ｘ線矢視断面図である。
【図３５】放射線が漏洩する状態を示す説明図である。
【符号の説明】
１ 貯蔵庫本体
１ａ 第１搬入出口
２ａ〜２ｅ 第１〜第５蓋部材
２ａ' 〜２ｅ' 第６〜第１０蓋部材
３ 外周壁
４ 仕切り壁
５ 梁部材
６ 懸吊部材
７ 上部層
８ 下部層
９ 係合部
１０ 放射性物質
１２ 逆凸型部材
１４〜１８ 第１〜第５蓋部材
２１ 主蓋部材
２２ 副蓋部材[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a split type shielding such as a pit type or silo type storage for radioactive materials used for storing radioactive materials in nuclear power plants or reprocessing plants.LidThe present invention relates to an attaching / detaching method.
[0002]
[Prior art]
Generally, a radioactive pit-type or silo-type storage has a radioactive material loading / unloading port on the upper surface so that the radioactive material can be loaded and unloaded while being suspended from a crane device. At the time of storage, leakage of radiation is sufficiently reduced by closing the loading / unloading port with a shielding lid made of concrete or the like with a large thickness.
[0003]
By the way, when the loading / unloading port of the storage has a large opening area, if it is a single-piece shielding lid, it becomes a heavy load, so usually a split type shielding lid that can be divided into a plurality of lid members is used. Therefore, it is avoided that the crane used for opening and closing the loading / unloading port becomes excessive. At this time, as shown in FIG. 35, when the end faces of the respective lid members 52 are formed in a straight line, the joint portion of the split type shielding lid has a radiation arrow of 55 from the gap between the end faces of the adjacent lid members 52. Leak in the direction of the note.
[0004]
Therefore, as shown in FIGS. 34 (a) to 34 (c), the conventional split type shielding lid has the end surface of each lid member 52 formed in a step shape, and the step of the lid member 52 on the end portion side at the carry-in / out port 51a. By configuring the portion to be pressed by the stepped portion of the lid member 52 on the center side, leakage of radioactive material during storage is reduced. And the division | segmentation type shielding lid comprised in this way also reduces the leakage of the radiation at the time of carrying in and carrying out of the radioactive substance 53 by performing the attachment or detachment operation | work of each cover member 52 in the following procedure.
[0005]
That is, first, after the lid member 52 existing at the A position in the center is removed, the lid members 52 at the B position and the C position are removed. Then, after carrying in / out of the radioactive substance 53 to / from the first accommodating part (1) and the second accommodating part (2), the lid member 52 at the C position is mounted, and the radioactive substance to the third accommodating part (3) is attached. 53 carry-in / out.
[0006]
Next, while attaching the lid member 52 at the B position, the lid member 52 at the D position and the E position is removed, and the radioactive substance 53 is carried into and out of the fourth accommodation portion (4) and the fifth accommodation portion (5). Do each. Then, after attaching the lid member 52 at the E position and carrying the radioactive substance 53 into and out of the sixth accommodating portion (6), the lid member 52 at the D position is attached. Then, after carrying in / out of the radioactive substance 53 to / from the seventh position (7), by attaching the lid member 52 at the A position, all the radioactive substances 53 are kept in a state where a part of the carry-in / out opening 51a is always closed. It is possible to complete the loading and unloading. Note that although there are many examples of the step structure (Z portion) in FIG. 34 (c), description thereof is omitted because it is not a requirement of the present invention.
[0007]
[Problems to be solved by the invention]
However, in the above-described conventional configuration and attachment / detachment procedure, when the radioactive substance 53 is carried into and out of the storage portions (the first storage portion (1) and the fourth storage portion (4)) at both ends of the storage body 51, Since it is necessary to remove the three lid members 52 from the central portion (A position) to the end portion (C position and E position), radiation leakage occurs when the loading / unloading port 51a opens with a larger area than necessary. Cannot be reduced sufficiently. If the leakage of radiation cannot be sufficiently reduced, an unfavorable situation in terms of radiation management occurs that causes an increase in the air dose rate above the storage body 51, and the crane apparatus breaks down during the loading and unloading of the radioactive substance 53. When the operator needs to attach the lid member 52 in a radioactive atmosphere as in the case, there arises a problem that the exposure dose is increased.
[0008]
Furthermore, conventionally, even when only carrying in / out the first storage part (1) of the storage body 51, three sheets from the center (A position) to the end (C position or E position) are used. Since the lid member 52 needs to be attached / detached, there is a problem that the lid member 52 is easily wasted.
[0009]
Further, in the conventional split type shielding lid, when the size of the lid member 52 is made to correspond to the radioactive substance 53 so that the lid member 52 does not become an obstacle when the radioactive substance 53 is carried in and out, it exists at the position A in the center. The lid member 52 is easier to increase in size than the other lid members 52. The enlargement of the lid member 52 causes the necessity of enlarging the crane member that transports the lid member 52 and the radioactive substance 53. Furthermore, when the opening area of the loading / unloading port 51a is increased, a space for temporarily placing a large number of lid members 52 is required. Therefore, in the prior art, there is a problem that the equipment cost increases due to the need for a large crane device and a large space for temporary placement.
[0010]
Therefore, the present invention (1) can carry in / out the radioactive substance 53 with a relatively small crane device, and (2) sufficiently reduce the leakage of radiation when the radioactive substance 53 is carried in / out. In order to prevent this, the opening area of the loading / unloading port 51a is suppressed to a necessary minimum, and (3) the division type that allows the radioactive material 53 to be loaded / unloaded in a state where the number of times of attaching / detaching the lid member 52 is reduced. It is intended to provide a shielding lid and a method for attaching and detaching the same.
[0020]
[Means for Solving the Problems]
  To solve the above problem,Claim1The invention ofA main lid member having a step portion formed on each of the one end face and the other end face so as to reduce the horizontal width from the upper surface side to the lower surface side, and the horizontal width from the upper surface side to the lower surface side in the predetermined amount unit. A plurality of sub lid members each provided with a step portion formed on one end surface and the other end surface so as to decrease and increase, and arranging the main lid member and the sub lid member while overlapping the step portions. Block the loading / unloading outlet of the storageA method for attaching and detaching the split type shielding lid,The main lid member is composed of a layered main member divided into layers for each step portion, and the sub cover member is integrally joined to each step portion constituting each sub cover member,Removing the main lid member and temporarily placing it in the standby position, thereby forming a temporary placement step for forming an opening at the removal position of the main lid member, and carrying in / out the radioactive substance to / from the storage body through the opening. A loading / unloading step for removing the sub lid member adjacent to the opening and turning on a horizontal plane, and then transferring to the opening to form a new opening; and the loading / unloading step And a repetitive process of repeating the process and the swivel transfer process until completion or interruption of loading / unloading, and a shielding process of transferring the main lid member at the standby position to the opening after the repetitive process. .
  According to a second aspect of the present invention, there is provided a main lid member provided with a step portion formed on each of the one end surface and the other end surface so as to reduce the horizontal width in units of a predetermined amount from the upper surface side to the lower surface side; A plurality of sub-cover members provided on one end surface and the other end surface, respectively, so as to reduce and increase the horizontal width in units of a predetermined amount toward the side, and the main cover member and the sub-cover member are stepped. It is a method of attaching and detaching a split type shielding lid that closes the loading / unloading port of the storage body by arranging the parts while overlapping each other, wherein the main lid member is a first member formed in the same shape as the sub lid member, The main lid member comprises a reverse convex member obtained by subtracting the width of the first member, and the sub lid member is integrally joined to each step portion constituting each sub lid member. By removing the member and temporarily placing it in the standby position A temporary placement step of forming an opening at a position where the main lid member is removed, a loading / unloading step of carrying in / out a radioactive substance to / from the storage body through the opening, and a sub lid adjacent to the opening After the member is pulled out and swiveled on a horizontal plane, the swivel transfer step of transferring to the opening to form a new opening, and the loading / unloading step and the swivel transfer step are completed or interrupted. And a shielding step of transferring the main lid member at the standby position to the opening after the repeating step.
  According to the above configuration, since the radioactive substance can be carried in / out while sequentially forming the opening corresponding to the size of the main lid member and the sub lid member, the opening area of the carry-in / out port is minimized. Thus, radiation leakage can be sufficiently reduced. Moreover, it can be carried out for each single opening, and only a space for the main lid member is required as a temporary place for the lid.
[0021]
  Claim3The present invention is a method for attaching and detaching a split type shielding lid, which has a horizontal width from the upper surface side to the lower surface side.TheDecrease by unitFormed to letMain lid member with stepped parts on one end surface and the other end surface, and horizontal width from upper surface side to lower surface sideTheDecrease and increase by a given unitFormed to letA plurality of sub lid members each having one end surface and the other end surface, and the main lid member and the sub lid member are arranged with the step portions overlapping each other, thereby closing the loading / unloading port of the storage body. A method for attaching and detaching a split type shielding lid, wherein the main lid member is removed and temporarily placed in a standby position, thereby forming an opening at the removal position of the main lid member, and the opening A loading / unloading process for loading / unloading the radioactive substance into / from the storage body, and after removing the sub lid member adjacent to the opening and turning on a horizontal plane, the new opening is transferred to the opening. A swivel transfer step to be formed, a repetitive step of repeating the carry-in / out step and the swivel transfer step until completion or interruption of carry-in / out, and a transfer of the main lid member at the standby position to the opening after the repetitive step. And having a shielding process. There.
  According to the above configuration, since the radioactive substance can be carried in / out while sequentially forming the opening corresponding to the size of the main lid member and the sub lid member, the opening area of the carry-in / out port is minimized. Thus, radiation leakage can be sufficiently reduced. Moreover, it can be carried out for each single opening, and only a space for the main lid member is required as a temporary place for the lid.
[0022]
  Claim4The present invention is a method for attaching and detaching a split type shielding lid, which has a horizontal width from the upper surface side to the lower surface side.TheDecrease by unitFormed to letMain lid member with stepped parts on one end surface and the other end surface, and horizontal width from upper surface side to lower surface sideTheDecrease and increase by a given unitFormed to letA plurality of sub lid members each having one end surface and the other end surface, and the main lid member and the sub lid member are arranged with the step portions overlapping each other, thereby closing the loading / unloading port of the storage body. A method of attaching and detaching a split type shielding lid, wherein the storage body has a first loading / unloading port closed with a split type shielding lid arranged in a positive direction so that the main lid member is positioned on one end side; The plurality of second loading / unloading ports closed by the divided shielding lids arranged in the opposite direction so that the main lid member is located on the other end side have the same dimensions in the loading / unloading port longitudinal direction or loading / unloading width direction Arranged in parallel in either direction, the main lid members of the first loading / unloading port and the specific second loading / unloading port are each pulled out and temporarily placed in a standby position, thereby allowing each main lid member to be pulled out. A temporary placing step for forming an opening, and an opening for the first loading / unloading port. A loading / unloading step of loading / unloading the radioactive substance into / from the storage body, and removing the sub lid members adjacent to the openings of the first loading / unloading port and the second loading / unloading port, respectively, In the transfer step of transferring each to the opening of the loading / unloading port to form a new opening, the repetition step of repeating the loading / unloading step and the transfer step until completion or interruption of loading / unloading, and the repetition step After the opening position of the first loading / unloading port has moved to the extreme end, the main lid member of the next second loading / unloading port is transferred to the opening of the first loading / unloading port, and the specific second loading / unloading port is moved to the first. A separate container transfer step for performing the repetitive process between the new first loading / unloading port and the second loading / unloading port, after setting the next second loading / unloading port as the specific second loading / unloading port, After the iterative process, the main lid member at the standby position is moved to the first position. It is characterized by having a shielding step of respectively transferred to the opening of the transfer port and a second transfer port.
  According to the above configuration, since the radioactive substance can be carried in / out while sequentially forming the opening corresponding to the size of the main lid member and the sub lid member, the opening area of the carry-in / out port is minimized. Thus, radiation leakage can be sufficiently reduced. Claims1 toClaim3In this case, it is possible to eliminate the need for a turning device for turning the sub lid member on a horizontal plane. Furthermore, the detachment operation of the main lid member when the repetitive process performed between the first loading / unloading port and the second loading / unloading port is transferred between the new first loading / unloading port and the second loading / unloading port to be separate containers. Can be reduced.
[0023]
  Claim5The present invention is a method for attaching and detaching a split type shielding lid, which has a horizontal width from the upper surface side to the lower surface side.TheDecrease by unitFormed to letMain lid member with stepped parts on one end surface and the other end surface, and horizontal width from upper surface side to lower surface sideTheDecrease and increase by a given unitFormed to letA plurality of sub lid members each having one end surface and the other end surface, and the main lid member and the sub lid member are arranged with the step portions overlapping each other, thereby closing the loading / unloading port of the storage body. A method of attaching and detaching a split type shielding lid, wherein the storage body has a first loading / unloading port closed with a split type shielding lid arranged in a positive direction so that the main lid member is positioned on one end side; A plurality of sets including a second loading / unloading port closed by a divided shielding lid arranged in the opposite direction so that the main lid member is located on the other end side have the same size and are in the longitudinal direction of the loading / unloading port. By being arranged in parallel in any direction of the loading / unloading width direction, the main lid members of the first loading / unloading port and the second loading / unloading port in the specific set of the plurality of sets are respectively removed and temporarily placed in the standby position , Temporary placing step of forming an opening at the removal position of each main lid member A first loading / unloading step of loading / unloading a radioactive substance into / from the storage body through the opening of the first loading / unloading port; and removing the sub lid member adjacent to the opening of the second loading / unloading port; A first transfer step of transferring to the opening of the loading / unloading port to form a new opening at the second loading / unloading port, and loading / unloading of the radioactive substance to / from the storage body through the opening of the second loading / unloading port. In the second loading / unloading step, the sub lid member adjacent to the opening of the first loading / unloading port is removed and transferred to the opening of the second loading / unloading port to form a new opening at the first loading / unloading port. A second transfer step, a repetition step for repeating the first transfer step, the first transfer step, the second transfer step, and the second transfer step until the end of loading / unloading or interruption, and the repetition step Later, the main lid member at the standby position is moved to the first loading / unloading port and the second loading / unloading port. It is characterized by having a shielding step of respectively transferred to the mouth portion. Further, during the repetition process, when the first loading / unloading port and the second loading / unloading port move to the end portion and further work is performed, the first and second loading / unloading ports are closed using another set of main lid members. It is also possible to move to a separate warehouse by providing an opening in a new set of storage.
  According to the above configuration, the claims4It is possible to carry in / out the radioactive material with fewer lid member attaching / detaching operations than in the case of the above, and carry in / out the radioactive material while sequentially forming openings corresponding to the size of the main lid member and sub lid member. Since it can be performed, leakage of radiation can be sufficiently reduced by suppressing the opening area of the carry-in / out port to the necessary minimum. It should be noted that the first transfer process and the second transfer process are not hindered even if the order is reversed.
[0024]
  Claim6The present invention is a method for attaching and detaching a split type shielding lid, which has a horizontal width from the upper surface side to the lower surface side.TheDecrease by unitFormed to letMain lid member with stepped parts on one end surface and the other end surface, and horizontal width from upper surface side to lower surface sideTheDecrease and increase by a given unitFormed to letA plurality of sub lid members each having one end surface and the other end surface, and the main lid member and the sub lid member are arranged with the step portions overlapping each other, thereby closing the loading / unloading port of the storage body. A split-type shielding lid attaching / detaching method, wherein the main lid member includes a first member formed in the same shape as the sub lid member, and a reverse convex type obtained by subtracting a width of the first member from the main lid member. The sub lid member is composed of a member,Configure each sub lid memberEach step portion is integrally coupled, and the storage body has a first loading / unloading port closed by a divided shielding lid arranged in a forward direction so that the main lid member is positioned on one end side. , A plurality of sets including a second loading / unloading port closed by a split type shielding lid arranged in the opposite direction so that the main lid member is located on the other end side have the same size and the loading / unloading port longitudinal direction Are arranged in parallel in any direction of the loading / unloading width direction, and each of the first loading / unloading port and the reverse loading-type member of the second loading / unloading port and the first loading / unloading port in the specific set of the plurality of sets A temporary placing step of forming an opening that enables loading and unloading of a radioactive substance at the first loading / unloading port by pulling out and temporarily placing it at the standby position, and the storage body through the opening of the first loading / unloading port. A first loading / unloading step for loading / unloading radioactive material and the second loading / unloading port; A first transfer step in which the first member or the sub lid member adjacent to the opening is removed and transferred to the opening of the first loading / unloading port to form a new opening at the second loading / unloading port; A second loading / unloading step of loading / unloading a radioactive substance into / from the storage body through the opening of the second loading / unloading port; and a sub lid member adjacent to the opening of the first loading / unloading port is removed, and the second loading / unloading port A second transfer step of transferring to the opening and forming a new opening at the first loading / unloading port; the first loading / unloading step; the first transfer step; the second loading / unloading step; An iterative process that repeats the transfer process until completion of loading / unloading, and a shielding process that transfers the main lid member at the standby position to the openings of the first loading / unloading port and the second loading / unloading port after the repeating process, respectively. It is characterized by having.
  According to the above configuration, the claims4Claims corresponding to the size of the main lid member and the sub lid member, enabling the radioactive substance to be carried in and out with a smaller number of operations of attaching and detaching the lid member than the case of5Since radioactive substances can be carried in and out while sequentially forming fewer openings, radiation leakage can be sufficiently reduced by suppressing the opening area of the carry-in / out opening to the minimum necessary. Moreover, a separate warehouse transfer can also be implemented.
[0026]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1
A first embodiment of the present invention will be described below with reference to FIGS.
As shown in FIG. 1, the split shielding cover according to the first embodiment constitutes a radioactive substance storage with the storage body 1. The storage body 1 is composed of a pit-type or silo-type structure, and the pit-type storage body 1 divides the space surrounded by the outer peripheral wall 3 with a partition wall 4 as shown in FIG. Thus, each of the plurality of storage rooms has a loading / unloading port 1a. On the other hand, as shown in FIG. 3, the silo-type storage body 1 is divided into a plurality of one storage chamber (internal space) by dividing the upper part of the internal space surrounded by the outer peripheral wall 3 with a beam member 5. It is set as the structure which has the following entrance / exit 1a.
[0027]
  As shown in FIG. 1, a split-type shielding lid is placed at the loading / unloading port 1 a of the storage body 1. The split type shielding lid has a horizontal width from the upper surface side to the lower surface side.TheDecrease by unitFormed to letMain lid member 21 provided with a stepped portion on one end surface and the other end surface, and a horizontal width from the upper surface side to the lower surface sideTheDecrease and increase by a given unitFormed to letAnd a plurality of sub lid members 22 each provided with a stepped portion on one end face and the other end face. The main lid member 21 and the sub lid member 22 are arranged while overlapping the step portions so that the radiation does not simultaneously leak through the gap between the abutting portions 7a and 8a and leak outside. The loading / unloading port 1a of the main body 1 is blocked.
[0028]
The main lid member 21 and the sub lid member 22 have a two-layer structure of an upper layer 7 and a lower layer 8 that are divided into layers at the stepped portion. The main lid member 21 includes a first lid member 2a (layered main member) of the upper layer 7 and a sixth lid member 2a ′ (layered main member) of the lower layer 8. Each of the sub lid members 22 includes second to fifth lid members 2b to 2e (layered sub member) of the upper layer 7 and seventh to tenth lid members 2b 'to 2e' (layered sub member) of the lower layer 8. It is made up of. The contact portion 7a between the cover members 2a to 2e in the upper layer 7 and the contact portion 8a between the cover members 2a 'to 2e' in the lower layer 8 are formed by the main cover member 21 and the sub cover member 22 being stepped. The position is set at a position where a predetermined shift amount d is displaced in the horizontal direction so that the parts overlap each other.
[0029]
The first to tenth lid members 2a to 2e ′ are formed in a rectangular flat plate shape, as shown in FIGS. 4A to 4C, and set to the same thickness and length. Yes. A plurality of engaging portions 9 constituting a lifting mechanism are formed on the upper surfaces of the lid members 2a to 2e ′. As shown in FIGS. 5A and 5B, each engaging portion 9 opens an engaging hole 9a formed in each lid member 2a to 2e ′ and a part of the upper surface of the engaging hole 9a. The insertion port 9b. The insertion port 9b is formed so as to substantially match the cross-sectional shape of the suspension member 6, and the suspension member 6 includes a rotation shaft 6b that can rotate at an arbitrary angle and a lower end of the rotation shaft 6b. And a flange portion 6a protruding in opposite directions from both side surfaces of the portion. The suspension member 6 can be moved up and down by a crane device (not shown), and the hook member 6a is inserted into the engagement hole 9a to rotate the rotation shaft 6b, thereby engaging with the engagement portion 9. It is possible to switch between a combined state and a released state.
[0030]
As shown in FIG. 1, among the first to tenth lid members 2a to 2e 'configured as described above, the second to tenth lid members 2b to 2e' are set to the same width Lb to Le '. ing. On the other hand, the first lid member 2a is set to a width La obtained by adding twice the displacement amount d to the widths Lb to Le 'of the other second to tenth lid members 2b to 2e'.
[0031]
Further, both ends of the upper layer 7 and the lower layer 8 in the longitudinal direction of the loading / unloading port (the width direction of the first to tenth lid members 2a to 2e ′) are upper support steps 3a formed on the outer peripheral wall 3 of the storage body 1. And the lower support stage 3b. The upper support step 3a and the lower support step 3b are formed in a stepped shape inward from the upper end surface of the outer peripheral wall 3, and the depth of the lower support step 3b is the first to tenth lid members 2a to 2e. It is set to match the thickness of '. The lower support stage 3b is formed on the entire periphery of the loading / unloading port 1a, and supports both ends of the lower layer 8 in the direction perpendicular to the paper surface (the length direction of the first to tenth lid members 2a to 2e ′). It is like that.
[0032]
In the above configuration, an example of a method for attaching and detaching the split type shielding lid when the radioactive substance is carried into the storage body 1 will be described.
[0033]
First, as shown in FIG. 6A, the first lid member 2a of the upper layer 7 is removed. That is, as shown in FIGS. 5 (a) and 5 (b), the crane device is remotely operated, the suspension member 6 is positioned above the first lid member 2a, and the hook portion 6a of the suspension member 6 is engaged. It is made to pass through the insertion port 9b of the part 9. Then, when the collar portion 6a enters the engagement hole 9a, the rotation shaft 6b is rotated by 90 ° to engage the suspension member 6 with the engagement portion 9, and then the suspension member 6 is interposed. The first lid member 2a is lifted and removed.
[0034]
When the first lid member 2a is removed as described above, the first lid member 2a is temporarily placed in a predetermined standby place (not shown), and then, as shown in FIG. By removing the sixth lid member 2a ′ of the lower layer 8 located in the same manner as described above, a part of one end side of the loading / unloading port 1a is opened (temporary placing step). Then, by carrying the radioactive substance 10 through the opening into the storage body 1 while being suspended by a crane device (not shown), the first accommodation portion {circle around (1)} and the second accommodation portion located below the opening. Each of the radioactive substances 10 is loaded into (2) (loading / unloading step).
[0035]
When the carrying of the radioactive substance 10 into the first housing part (1) and the second housing part (2) is completed, as shown in FIG. 6 (c), the second lid member 2b existing in the upper layer 7 is removed from the first lid member 2b. And it transfers to the lower layer 8 above 2nd accommodating part (1) * (2). Thereafter, as shown in FIG. 6 (d), by transferring the seventh lid member 2b ′ of the lower layer 8 to the upper surface (upper layer 7) of the second lid member 2b, the third accommodating portion (3). And the upper part of 4th accommodating part (4) is opened (transfer process). Then, the radioactive substance 10 is loaded through the opening while being suspended by a crane device (not shown), so that the radioactive substance 10 is loaded into the third accommodation part (3) and the fourth accommodation part (4) ( Loading / unloading process).
[0036]
The operation of opening a part of the upper layer 7 and the lower layer 8 as described above is repeated in order (repetition process), and the final tenth accommodating portion(Ten)When the loading of the radioactive substance 10 is finished, as shown in FIG. 6E, the sixth lid member 2a ′ temporarily placed in the standby place is transferred to the opening of the lower layer 8. Then, the loading / unloading port 1a of the storage body 1 is closed by placing the first lid member 2a on the upper surface of the sixth lid member 2a ′ (shielding step). In addition, as shown in FIG.(Ten)For example, when the loading of the radioactive substance 10 is stopped in the eighth accommodating portion {circle around (8)}, the sixth opening portion is placed at the opening position so as to close the opening located above the eighth accommodating portion {circle around (8)}. The lid member 2a ′ and the first lid member 2a are transferred (shielding step). In addition, since the radioactive substance 10 can be carried out by an operation reverse to the above-described operation, the description thereof is omitted.
[0037]
As described above, according to the configuration and the attachment / detachment method of the present embodiment, the radioactive substance 10 can be carried in / out with an opening area corresponding to one of the lid members 2a to 2e ′, so that radiation leakage is minimized. Can be reduced. Accordingly, when the operator needs to block the loading / unloading port 1a in a radioactive atmosphere, such as when the crane apparatus breaks down during loading / unloading, the opening of the lower layer 8 is blocked by at least the sixth lid member 2a ′. If the operation is performed, direct leakage of radiation can be reduced only to leakage from the gap. Since the operation of placing the first lid member 2a on the sixth lid member 2a ′ can be performed in the reduced radioactive atmosphere, the loading / unloading port 1a can be shortened while sufficiently reducing the exposure of the operator. Can be completely closed in time.
[0038]
Incidentally, the first to tenth lid members 2a to 2e ′ are manufactured and managed on site when the second to tenth lid members 2b to 2e ′ are set to the same widths Lb to Le ′ as described above. Although desirable in terms of simplification above, any width La to Le ′ can be selected as long as the following conditions are satisfied.
[0039]
That is, the first condition that the width La of the first lid member 2a is a length obtained by adding twice the displacement amount d to the width La ′ of the sixth lid member 2a ′ positioned below, and Lb = Lb ′. , Lc = Lc ′, Ld = Le ′, Le = Le ′, and the width La ′ of the sixth lid member 2a ′ is the width Lb of the remaining second to fifth lid members 2b to 2e. If the third condition that the length is equal to or longer than Le is satisfied, an arbitrary width La to Le can be selected. Here, the reason why the third condition needs to be satisfied is that, for example, if the width La ′ of the sixth lid member 2a ′ is narrower than the width Ld of the fourth lid member 2d, as shown in FIG. This is because the lid member 2d cannot be transferred to the opening of the lower layer 8.
[0040]
In the present embodiment, the first lid member 2a and the sixth lid member 2a ′ constituting the main lid member 21 are individually formed. However, if there is a margin in handling equipment such as a crane, the first lid member 2a and the sixth lid member 2a ′ are integrated. In this case, the operation for transferring the first lid member 2a and the sixth lid member 2a ′ can be simplified.
[0041]
Further, in the present embodiment, the split type shielding lid has a two-layer structure of the upper layer 7 and the lower layer 8, but is not limited to this, and is shown in FIGS. 9 (a) and 9 (b). As shown, a three-layer structure of an upper layer 7, a middle layer 11 and a lower layer 8 may be used. However, in the case of the three-layer structure, the width La of the first lid member 2a is a length obtained by adding twice the shift amount d to the width La ′ of the sixth lid member 2a ′ positioned below. And the second condition that the width La ′ of the sixth lid member 2a ′ is a length obtained by adding twice the displacement d to the width La ″ of the eleventh lid member 2a ″ positioned below. A third condition consisting of Lb = Lb ′ = Lb ″, Lc = Lc ′ = Lc ″, Ld = Ld ′ = Ld ″, Le = Le ′ = Le ″, and an eleventh lid member 2a It is necessary to satisfy the fourth condition that “width La” is equal to or larger than the widths Lb to Le of the second to fifth lid members 2b to 2e. However, the fourth condition is that it is practically preferable that all widths other than the first, sixth, and eleventh lid members 2a, 2a ′, and 2a ″ are equal to each other. It is the same.
[0042]
[Embodiment 2]
A second embodiment of the present invention will be described below with reference to FIG. In addition, the same code | symbol is attached | subjected to the member same as 1st Embodiment, and the description is abbreviate | omitted.
[0043]
The split type shielding lid according to the second embodiment includes a main lid member 21 and a sub lid member 22 as shown in FIGS. The main lid member 21 has the same width as the second to fifth lid members 2b to 2e of the sub lid member 22 and the like, and the first and sixth lid members 2a and 2a ′ (layered main) divided into layers at each step portion. Member) and an inverted convex member 12 obtained by subtracting the width of the sub lid member 22 from the main lid member 21. The inverted convex member 12 is composed of an upper layer portion 12a corresponding to the upper layer 7 and a lower layer portion 12b corresponding to the lower layer 8, and the upper layer portion 12a has a deviation d of 2 in the width LA of the lower layer portion 12b. It is set to a width LA + 2d after adding double. And on the side of the main lid member 21, it corresponds to the second to fifth lid members 2 b to 2 e (layered sub members) corresponding to the upper layer 7 of the sub lid member 22 and the lower layer 8 of the sub lid member 22. 7 to 10th lid members 2b ′ to 2e ′ (layered sub-members) are arranged, and these lid members 2b to 2e ′ and 2b ′ to 2e ′ are set to have the same width. Other configurations are the same as those of the first embodiment.
[0044]
In the above configuration, a method for attaching and detaching the split type shielding lid when the radioactive substance is carried into the storage body 1 will be described.
[0045]
First, after the suspension member is engaged with an engagement portion (not shown) of the reverse convex member 12, the reverse convex member 12 is lifted and removed, and temporarily placed in a predetermined standby place. Subsequently, the first lid member 2a and the sixth lid member 2a ′ are removed and temporarily placed to open a part of one end side of the loading / unloading port 1a (temporary placing step). Thereafter, the radioactive material 10 is suspended through the opening by a crane device (not shown) and is carried into the storage body 1, whereby the first storage portion {circle around (1)} and the second storage are located below the opening. Each of the radioactive substances 10 is loaded in the part (2) (loading / unloading step).
[0046]
When the radioactive material 10 has been carried into the first housing portion (1) and the second housing portion (2), the second lid member 2b existing in the upper layer 7 is moved to the first and second housing portions (1) and (2). 2) Transferred to the lower layer 8 above. Thereafter, the seventh lid member 2b ′ of the lower layer 8 is transferred onto the upper surface (upper layer 7) of the second lid member 2b, thereby allowing the upper portion of the third accommodating portion (3) and the fourth accommodating portion (4) to be higher. Is opened (transfer process). Then, the radioactive substance 10 is loaded through the opening while being suspended by a crane device (not shown), so that the radioactive substance 10 is loaded into the third accommodation part (3) and the fourth accommodation part (4) ( Loading / unloading process).
[0047]
The operation of opening a part of the upper layer 7 and the lower layer 8 as described above is repeated in order (repetition process), and the final tenth accommodating portion(Ten)When the loading of the radioactive substance 10 on the surface is completed, the first lid member 2a (or 2a ′) temporarily placed in the standby place is transferred to the opening of the lower layer 8, and the upper surface of the first lid member 2a. 6th cover member 2a '(or 2a) is mounted in (2). Then, the loading / unloading port 1a is closed by transferring the inverted convex member 12 to the opening remaining at the end of the loading / unloading port 1a (shielding step). In addition, since the radioactive substance 10 can be carried out by an operation reverse to the above-described operation, the description thereof is omitted.
[0048]
As described above, according to the configuration and the attachment / detachment method of the present embodiment, the first to tenth lid members 2a to 2e ′ can be obtained with the same width, and therefore the first to tenth lid members 2a to 2e ′ can be obtained. Can be easily created. Moreover, if the opening area required when carrying in / out the radioactive substance 10 is set by changing the width of the inverted convex member 12, the width (weight) of the first to tenth lid members 2a to 2e ′ is minimized. Therefore, the equipment cost can be reduced by using a crane device having a low suspension capacity.
[0049]
[Embodiment 3]
A third embodiment of the present invention will be described below with reference to FIGS. In addition, the same code | symbol is attached | subjected to the member same as 1st Embodiment, and the description is abbreviate | omitted.
[0050]
  As shown in FIG. 11A, the split type shielding lid according to the third embodiment includes a first lid member 14 that is a main lid member 21 and second to fifth lid members 15 that are sub lid members 22. ~ 18. As shown in FIG. 12B, the first lid member 14 has a horizontal width from the upper surface side to the lower surface side.TheDecrease by unitFormed to letThe upper portion 14a has a width LA2 (= LA1 + 2d) obtained by adding twice the shift amount d to the width LA1 of the lower portion 14b. Is set.
[0051]
  Further, the second to fifth lid members 15 to 18 have upper portions 15a to 18a and lower portions 15b to 18b, and the upper portion 15a is displaced by a displacement amount d in the horizontal direction with respect to the lower portion 15b. Horizontal width from top to bottomTheDecrease and increase by a given unitFormed to letThe step portions are formed in a shape having one end surface and the other end surface, respectively. And these 1st-5th cover members 14-18 are set to the same total thickness T while the lower parts 14b-18b are set to the same thickness H. As shown in FIG.
[0052]
Moreover, both ends of the carry-in / out port longitudinal direction of the split type shielding lid are respectively supported by an upper support stage 3a and a lower support stage 3b formed on the outer peripheral wall 3 of the storage body 1 as shown in FIG. ing. The upper support step 3 a and the lower support step 3 b are formed in a step shape inward from the upper end surface of the outer peripheral wall 3. Other configurations are the same as those of the first embodiment.
[0053]
In the above configuration, a method for attaching and detaching the split type shielding lid when the radioactive substance is carried into the storage body 1 will be described.
[0054]
First, after engaging a suspension member with an engagement portion (not shown) of the first lid member 14, the first lid member 14 is lifted and removed by a crane device, and temporarily placed in a predetermined waiting place. As shown to 11 (b), a part of one end side of the loading / unloading exit 1a is opened (temporary placing process). Thereafter, the radioactive material 10 is suspended through the opening by a crane device (not shown) and is carried into the storage body 1, whereby the first storage portion {circle around (1)} and the second storage are located below the opening. Each of the radioactive substances 10 is loaded in the part (2) (loading / unloading step).
[0055]
Next, as shown in FIG. 11 (c), after the second lid member 15 is lifted upward by the crane device and swung on the horizontal plane of 180 °, the first and second accommodating portions (1) and (2) By moving upward, the upper part of the third storage part {circle around (3)} and the fourth storage part {circle around (4)} is opened (swivel transfer step). Then, the radioactive substance 10 is loaded through the opening while being suspended by a crane device (not shown), so that the radioactive substance 10 is loaded into the third accommodation part (3) and the fourth accommodation part (4) ( Loading / unloading process).
[0056]
The operation of opening a part of the loading / unloading port 1a as described above is repeated in order (repetition process), and the final tenth accommodating portion(Ten)When loading of the radioactive material 10 onto the end, as shown in FIG. 11 (d), the first lid member 14 temporarily placed in the standby place is replaced with the tenth receiving portion.(Ten)The opening is closed by being transferred to the opening position above (opening process). Further, as shown in FIG.(Ten)For example, when the carrying of the radioactive substance 10 is stopped in the seventh accommodating portion {circle around (7)}, the first lid member 14 is transferred to the opening position above the seventh accommodating portion {circle around (7)}. Block the part (shielding process). In addition, since the radioactive substance 10 can be carried out by an operation reverse to the above-described operation, the description thereof is omitted.
[0057]
As described above, according to the configuration and the attachment / detachment method of the present embodiment, the lid members 14 to 18 can be formed into a single layer without being divided into a plurality of layers as in the first embodiment, and thus the following three advantages arise. . That is, (1) easy handling (the upper and lower two layers can be handled twice). (2) Since the section modulus and the moment of inertia of the lid member are increased, there are less restrictions on strength. In some cases, the total thickness T of the lid members 14 to 18 can be reduced to the minimum necessary for shielding, and the weight of the split type shielding lid can be reduced. Furthermore, (3) since it is not necessary to laminate the lid members 14 to 18, the engaging portion used for hanging the lid members 14 to 18 can have a simple configuration protruding from the upper surface.
[0058]
In addition, in this embodiment, as shown to Fig.14 (a), upper part 14a-18a and lower part of each cover member 14-18 by the upper support step 3a and the lower support step 3b of the outer peripheral wall 3 of a carrying-in / out port longitudinal direction Although it is set as the structure which can support 14b-18b, respectively, if shielding performance can be ensured, it will not be limited to this. That is, as shown in FIG. 14B, the upper portions 14a to 18a of the lid members 14 to 18 may be supported by a support step 3c formed inside the upper end of the outer peripheral wall 3. And as shown in FIG.14 (c), you may be comprised so that upper part 14a-18a of each cover member 14-18 may be supported by the upper end surface of the outer peripheral wall 3. As shown in FIG.
[0059]
Moreover, in this embodiment, although each cover member 14-18 is made into the 2 layer structure of upper part 14a-18a and lower part 14b-18b, it is not limited to this, FIG. As shown in b), it may have a three-layer structure. Moreover, as shown to Fig.16 (a), each cover member 14-18 of this embodiment may be bent in the orthogonal | vertical direction with respect to the upper surface and the lower surface, as shown in FIG. As shown in b) and (c), both end surfaces in the width direction may be bent at a predetermined inclination angle θ with respect to the upper surface and the lower surface. In general, (1) the mounting is facilitated by the inclined surface as a guide during mounting, and (2) the effective shielding thickness is more vertical than that shown in FIGS. 16 (b) and 16 (c). In many cases, it is inclined.
[0060]
Furthermore, in the present embodiment, as shown in FIG. 12B, the first lid member 14 is formed by integrating the upper portion 14a and the lower portion 14b. However, the present invention is not limited to this. That is, the first lid member 14 divides the upper portion 14a and the lower portion 14b of the first lid member 14 into two parts in the vertical direction as needed, and as shown in FIGS. 17 (a) and 17 (b), the upper member 19a. The first lid member 19 may be formed separately from the lower member 19b. Further, as shown in FIGS. 18A and 18B, the first lid member 14 includes a first member 20b formed in the same shape as the other second to fifth lid members 15 to 18, and a first lid. The first lid member 20 may be divided into a reverse convex member 20a having a reverse convex shape in cross section obtained by subtracting the first member 20b from the member 14. In the case of these configurations, the weight of the first lid member 19 is distributed to the upper member 19a (reverse convex member 20a) and the lower member 19b (first member 20b), and the members 19a and 19b (20a) are dispersed. -Since 20b) can be reduced in weight rather than the other 2nd-5th cover members 15-18, the crane apparatus corresponding to the 2nd-5th cover members 15-18 can be employ | adopted.
[0061]
[Embodiment 4]
A fourth embodiment of the present invention will be described below with reference to FIGS. In addition, the same code | symbol is attached | subjected to the member same as 3rd Embodiment, and the description is abbreviate | omitted.
[0062]
As shown in FIG. 22 (a), the split type shielding lid according to the fourth embodiment includes a first lid member 14 that is a main lid member 21 having an inverted convex cross section having an upper portion 14a and a lower portion 14b. Upper part 15a-18a and lower part 15b-18b have the 2nd-5th cover member 15-18 which is the sub cover member 22 displaced in the horizontal direction as a set. The lower portion 14b of the first lid member 14 is set to have a width equal to or wider than the lower portions 15b to 18b of the second to fifth lid members 15 to 18. And each division | segmentation type | mold shielding cover has block | closed several 1st-3rd loading / unloading exit 1a * 1a '* 1a' 'formed in the storage main bodies 1, such as a pit type and a silo type, respectively.
[0063]
The first to third loading / unloading ports 1a, 1a ′, and 1a ″ are arranged in the loading / unloading width direction (longitudinal direction of the lid members 14 to 18) as shown in FIG. The same applies to the arrangement in the longitudinal direction of the loading / unloading port, which is the width direction of the lid members 14 to 18 as shown in FIG. The split-type shielding lid that closes the first loading / unloading port 1a has the first lid member 14 disposed at the left end position in the figure before the loading starts, and the second lid member 15 to the fifth lid member 15 to 18 are arranged from the first lid member 14. The configuration is a regular array arranged in order on the right side of the figure. On the other hand, the split type shielding lids for closing the second and third loading / unloading ports 1a ′ and 1a ″ have the respective lid members 14˜ from the right side to the left side in the drawing in the direction opposite to the divided shielding lids for closing the first loading / unloading port 1a. 18 is arranged in a reverse arrangement. In addition, the subsequent loading / unloading ports (not shown) are closed by the split type shielding lid having the reverse arrangement. The sub lid members 22 are all in the same shape, and are installed in a state where they are rotated by 180 ° between the normal arrangement and the reverse arrangement. Moreover, the both ends of the carry-in / out port longitudinal direction in the split type shielding lid are respectively supported by support steps 3c formed on the outer peripheral wall 3 of the storage body 1 as shown in FIG. Other configurations are the same as those of the third embodiment.
[0064]
In the above configuration, a method for attaching and detaching the split type shielding lid when the radioactive substance is carried into the storage body 1 will be described.
[0065]
Before the start of carrying in the radioactive substance 10, as shown in FIGS. 19 and 22 (a), all the first to third loading / unloading ports 1a, 1a ′, and 1a ″ are blocked by the divided shielding lids. It is in a state. When carrying in the radioactive substance 10, first, the first lid member 14 of the split type shielding lid that closes the first carry-in / out opening 1 a is lifted and removed by the crane device, and temporarily placed in a predetermined standby place. At the same time, the first lid member 14 ′ of the second loading / unloading port 1a ′ is pulled out and temporarily placed by the same operation, so that as shown in FIG. 22 (b), A right end portion in the drawing of the second loading / unloading port 1a ′ is opened (temporary placing step). And the radioactive substance 10 is carried in through the opening part of the 1st loading / unloading exit 1a (carrying-in / out process).
[0066]
Next, as shown in FIG. 22 (c), the second lid member 15 ′ of the second loading / unloading port 1a ′ is lifted upward by the crane device and horizontally moved in the direction of the opening of the first loading / unloading port 1a. It mounts in the opening part of the 1st entrance / exit 1a. At this time, since the shape of the support stage 3c of the first loading / unloading port 1a and the end of the second lid member 15 ′ coincide with each other, it is not necessary to turn the second lid member 15 ′. Thereafter, as shown in FIG. 22 (d), the second lid member 15 of the first loading / unloading port 1a is lifted upward by the crane device and horizontally moved in the direction of the opening of the second loading / unloading port 1a ′. 2 Placed in the opening of the loading / unloading port 1a ′. Even in this case, since the shape of the support stage 3c of the second loading / unloading port 1a ′ and the end of the second lid member 15 coincide with each other, it is not necessary to turn the second lid member 15 (transfer step). . When the opening appears between the second lid member 15 ′ and the third lid member 16 at the first loading / unloading port 1a in this way, the radioactive substance 10 is loaded through the opening (loading / unloading step). ).
[0067]
Thereafter, as shown in FIG. 22 (e), the third lid member 16 of the first loading / unloading port 1a is transferred to the side of the second lid member 15 of the second loading / unloading port 1a ′, and the second loading / unloading port. By transferring the third lid member 16 ′ of 1a ′ to the side of the second lid member 15 ′ of the first loading / unloading port 1a, a new opening appears at the first loading / unloading port 1a. The radioactive substance 10 is carried in through. And the radioactive substance 10 is carried in with respect to the 1st loading / unloading exit 1a by repeating such operation in order (repetition process). Then, when the radioactive material 10 is filled into the first loading / unloading port 1a, for example, when the radioactive material 10 is full, and subsequently the radioactive material 10 is loaded into the second storage, as shown in FIG. The first lid member 14 '' of the third loading / unloading outlet 1a '' is transferred to the opening on the right side of the outlet 1a in the drawing (separate container transfer step).
[0068]
Thereafter, as shown in FIG. 23, the operation between the first loading / unloading port 1a and the second loading / unloading port 1a ′ is performed between the second loading / unloading port 1a ′ and the third loading / unloading port 1a ″. In the same way, the radioactive substance 10 is carried in at the second loading / unloading port 1a ′. Further, for example, when the carrying of the radioactive substance 10 at the second loading / unloading port 1a ′ is stopped halfway, as shown in FIG. 24, the radioactive material 10 is temporarily placed in a standby place (not shown) at the opening of the first loading / unloading port 1a. The opening can be closed by transferring the first lid member 14 (shielding step).
[0069]
As described above, according to the configuration and the attaching / detaching method of the present embodiment, the openings are sequentially made to appear at the first to third loading / unloading ports 1a, 1a ′, 1a ″ without rotating the lid members 14-18. Since the radioactive substance 10 can be carried in through the opening, it is not necessary to provide a turning mechanism in the crane device, and the device cost can be reduced.
[0070]
[Embodiment 5]
A fifth embodiment of the present invention will be described below with reference to FIGS. In addition, the same code | symbol is attached | subjected to the member same as 4th Embodiment, and the description is abbreviate | omitted.
[0071]
As shown in FIG. 25, the split type shielding lid according to the fifth embodiment is a pit type or silo type storage body main body 1 in the loading / unloading width direction (longitudinal direction of the first to tenth lid members 2 a to 2 e ′). A plurality of, for example, the first to fourth loading / unloading ports 1a, 1a ', 1a ", and 1a" "formed in (1) are respectively closed. The odd-numbered loading / unloading outlets such as the first loading / unloading port 1a and the third loading / unloading port 1a '' are arranged in the forward direction by alternately arranging the divisional shielding lids of the normal arrangement and the divisional shielding lids of the reverse arrangement. On the other hand, even-numbered loading / unloading ports such as the second loading / unloading port 1a ′ and the fourth loading / unloading port 1a ′ ″ are blocked by reverse-divided dividing-type shielding lids. Other configurations are the same as those of the fourth embodiment.
[0072]
In the present embodiment, the divisional shielding lids of the normal arrangement and the divisional shielding lids of the reverse arrangement are alternately arranged one by one. However, the present invention is not limited to this. For example, As shown in FIG. 26, the divisional shielding lid of the normal arrangement and the divisional shielding lid of the reverse arrangement may be alternately arranged in a plurality of rows such as two rows. Further, for example, as shown in FIG. 27, in the case where a plurality of, for example, first to fourth loading / unloading ports 1a, 1a ′, 1a ″, and 1a ″ ″ are formed in the longitudinal direction of the loading / unloading port of the storage body 1. The divided shielding lids may be arranged alternately in the above-mentioned one row or plural rows.
[0073]
In the above configuration, a method for attaching and detaching the split type shielding lid when the radioactive substance is carried into the storage body 1 will be described.
[0074]
Before starting to carry in the radioactive substance 10, as shown in FIG. 25 and FIG. 29 (a), all the first to fourth loading / unloading ports 1a, 1a ′, 1a ″, and 1a ″ ″ are divided and shielded. It is in a state closed by a lid. When carrying in the radioactive substance 10, first, the first lid member 14 of the split type shielding lid that closes the first carry-in / out opening 1 a is lifted and removed by the crane device, and temporarily placed in a predetermined standby place. At the same time, by removing and temporarily placing the first lid member 14 'of the second loading / unloading port 1a' by the same operation, as shown in FIG. 29 (b), the left end portion of the first loading / unloading port 1a in FIG. A right end portion in the drawing of the second loading / unloading port 1a ′ is opened (temporary placing step). And the radioactive substance 10 is carried in through the opening part of these 1st loading / unloading exits 1a (1st loading / unloading process).
[0075]
Next, as shown in FIG. 29 (c), after the second lid member 15 ′ of the second loading / unloading port 1a ′ is lifted upward by the crane device and horizontally moved in the direction of the opening of the first loading / unloading port 1a, It mounts in the opening part of the 1st loading / unloading exit 1a (1st transfer process). And the radioactive substance 10 is carried in through the opening part of 2nd carrying in / out opening 1a 'expanded by removal of 2nd cover member 15' (2nd carrying in / out process). Thereafter, as shown in FIG. 29 (d), the second lid member 15 of the first loading / unloading port 1a is transferred to the opening of the second loading / unloading port 1a ′ by the crane device (second transfer step), The radioactive substance 10 is carried in through an opening that appears between the second lid member 15 ′ and the third lid member 16 in the first carry-in / out port 1a (first carry-in / out step).
[0076]
Next, as shown in FIG. 30 (a), the third lid member 16 of the first loading / unloading port 1a is transferred to the opening of the second loading / unloading port 1a ′, whereby the third lid member 16 is removed. By carrying the radioactive substance 10 through the enlarged opening of the first loading / unloading port 1a, and further transferring the third lid member 16 'of the second loading / unloading port 1a' to the opening of the first loading / unloading port 1a. Then, the radioactive substance 10 is carried in through the opening of the second loading / unloading port 1a ′ expanded by removing the third lid member 16 ′. Then, such an operation is repeated in order (repetition process), and finally closed by the first lid members 14 and 14 ′, whereby the first loading / unloading port 1a and the second loading / unloading port 2 are performed as shown in FIG. 30 (b) and FIG. The radioactive substance 10 can be carried in simultaneously at the carry-in / out port 1a ′. Further, when the work is interrupted in the middle, it is sufficient to close the work with the first lid members 14 and 14 'at the time, similarly to the other embodiments.
[0077]
In addition, although the case where the attachment / detachment method of this embodiment is applied to the division | segmentation type | mold shielding cover provided with the 1st cover member 14 formed integrally is demonstrated, for example to Fig.18 (a) * (b) As shown, the present invention can also be applied to a split type shielding lid provided with a first lid member 20 that is divided into a first member 20b and an inverted convex member 20a. That is, since the first member 20b of the first lid member 20 is formed in the same shape as the other second to fifth lid members 15 to 18, first, the reverse convex member 20a is temporarily placed in the temporary placement step. Then, the radioactive substance 10 can be carried in by transferring the inverted convex member 20a in the first and second transfer steps in the same manner as the second to fifth lid members 15-18.
[0078]
In addition, when the radioactive substance 10 is radioactive waste, there are many examples in which the shape is normalized and stored in an orderly manner. Therefore, as shown in FIG. 31, in the case where the radioactive substances 10 having the same width dimension P are arranged at equal intervals in the storage as a storage object, the following conditional expressions (1) to (3) are satisfied. It is desirable. If these conditional expressions (1) to (3) are satisfied, (1) it is possible to facilitate the production of the split type shielding cover and the handling work management, and (2) the radioactive substance 10 At the time of loading / unloading, the radioactive substance 10 is moved up and down while maintaining an appropriate gap (more than the interval c between the loaded radioactive substances 10) with respect to the end face of the opening (end faces of the lid members 14 to 18). be able to.
[0079]
LA ≧ LB + e + f (1)
LB ≧ m (P + c) (2)
LA + (N−1) LB = W + 2f (3)
[0080]
However,
W: Width of loading / unloading exit
e: Distance from the end face of the loading / unloading exit to the outermost surface of the radioactive substance
P: Width P of radioactive material 10
c: Clearance of radioactive material 10
f: Support width of the bottom surface of the lid member at the loading / unloading port
LA: Lower surface width of main lid member
(In the case of the first lid member 19 in FIG. 17, the width of the lower member 19b)
LB: width of the lower surface of the sub lid member
m: Quantity of radioactive substance 10 that can be installed with the width of the lower surface of the sub lid member
N: Number of divisions by the lid member composed of the main lid member and the sub lid member (total of the main lid member and the sub lid member)
It is.
[0081]
In the case where the split type shielding lid does not satisfy the conditional expressions (1) to (3), for example, in the case shown in FIG. 33, an attempt is made to carry in / out the radioactive substance 10 in the second accommodating portion (2). Sometimes it interferes with the left end of the B1 lid member at stage A and interferes with the right end of the b1 lid member at stage A. Therefore, if it is going to carry in / out in the second housing portion {circle around (2)}, it becomes necessary to remove the main lid member and the sub lid member or to move up and down while avoiding the interference point.
[0082]
Further, as shown in FIG. 32, the split type shielding lid divides the main lid member (bottom surface width: LA) into the reverse convex member AO (bottom surface width: LA0) and the first member BA (bottom surface width: LBA). In this case, if the following conditional expressions (4) and (5) are satisfied in addition to the conditional expressions (1) to (3), as in the case described above, the production of the split type shielding lid and the handling work management The above simplification can be realized, and at the time of loading / unloading of the radioactive substance 10, an appropriate gap (between the loaded radioactive substances 10) with respect to the end faces of the openings (end faces of the lid members 14 to 18). The radioactive substance 10 can be moved up and down while maintaining the interval c).
[0083]
LBA = LB (4)
LA = LAO + LBA (5)
In the above general description, the joining surface is vertical. However, in actuality, for the purpose of (1) facilitating the attachment / detachment of the lid member and (2) compensating for the shielding defect on the joining surface, FIG. Of course, the present invention can also be applied to the case where the joint surface is inclined as illustrated in FIGS.
[0093]
【The invention's effect】
  Claim1The invention ofA main lid member having a step portion formed on each of the one end face and the other end face so as to reduce the horizontal width from the upper surface side to the lower surface side, and the horizontal width from the upper surface side to the lower surface side in the predetermined amount unit. A plurality of sub lid members each provided with a step portion formed on one end surface and the other end surface so as to decrease and increase, and arranging the main lid member and the sub lid member while overlapping the step portions. Block the loading / unloading outlet of the storageA method for attaching and detaching the split type shielding lid,The main lid member is composed of a layered main member divided into layers for each step portion, and the sub cover member is integrally joined to each step portion constituting each sub cover member,Removing the main lid member and temporarily placing it in the standby position, thereby forming a temporary placement step for forming an opening at the removal position of the main lid member, and carrying in / out the radioactive substance to / from the storage body through the opening. A loading / unloading step for removing the sub lid member adjacent to the opening and turning on a horizontal plane, and then transferring to the opening to form a new opening; and the loading / unloading step It is the structure which has the repetition process which repeats a process and the said rotation transfer process to completion | finish or interruption of carrying in / out, and the shielding process which transfers the main cover member of the said standby position to the said opening part after the said repetition process.
  According to a second aspect of the present invention, there is provided a main lid member provided with a step portion formed on each of the one end surface and the other end surface so as to reduce the horizontal width in units of a predetermined amount from the upper surface side to the lower surface side; A plurality of sub-cover members provided on one end surface and the other end surface, respectively, so as to reduce and increase the horizontal width in units of a predetermined amount toward the side, and the main cover member and the sub-cover member are stepped. It is a method of attaching and detaching a split type shielding lid that closes the loading / unloading port of the storage body by arranging the parts while overlapping each other, wherein the main lid member is a first member formed in the same shape as the sub lid member, The main lid member comprises a reverse convex member obtained by subtracting the width of the first member, and the sub lid member is integrally joined to each step portion constituting each sub lid member. By removing the member and temporarily placing it in the standby position A temporary placement step of forming an opening at a position where the main lid member is removed, a loading / unloading step of carrying in / out a radioactive substance to / from the storage body through the opening, and a sub lid adjacent to the opening After the member is pulled out and swiveled on a horizontal plane, the swivel transfer step of transferring to the opening to form a new opening, and the loading / unloading step and the swivel transfer step are completed or interrupted. And a shielding process for transferring the main lid member at the standby position to the opening after the repeating process.
  According to the above configuration, since the radioactive substance can be carried in / out while sequentially forming the opening corresponding to the size of the main lid member and the sub lid member, the opening area of the carry-in / out port is minimized. Thus, radiation leakage can be sufficiently reduced. In addition, it can be carried out for each single opening, and there is an effect that only a space for the main lid member is required as a temporary place for the lid.
[0094]
  Claim3The present invention is a method for attaching and detaching a split type shielding lid, which has a horizontal width from the upper surface side to the lower surface side.TheDecrease by unitFormed to letMain lid member with stepped parts on one end surface and the other end surface, and horizontal width from upper surface side to lower surface sideTheDecrease and increase by a given unitFormed to letA plurality of sub lid members each having one end surface and the other end surface, and the main lid member and the sub lid member are arranged with the step portions overlapping each other, thereby closing the loading / unloading port of the storage body. A method for attaching and detaching a split type shielding lid, wherein the main lid member is removed and temporarily placed in a standby position, thereby forming an opening at the removal position of the main lid member, and the opening A loading / unloading process for loading / unloading the radioactive substance into / from the storage body, and after removing the sub lid member adjacent to the opening and turning on a horizontal plane, the new opening is transferred to the opening. A swivel transfer step to be formed, a repetitive step of repeating the carry-in / out step and the swivel transfer step until completion or interruption of carry-in / out, and a transfer of the main lid member at the standby position to the opening after the repetitive step. And a shielding step.
  According to the above configuration, since the radioactive substance can be carried in / out while sequentially forming the opening corresponding to the size of the main lid member and the sub lid member, the opening area of the carry-in / out port is minimized. Thus, radiation leakage can be sufficiently reduced. In addition, it can be carried out for each single opening, and there is an effect that only a space for the main lid member is required as a temporary place for the lid.
[0095]
  Claim4The present invention is a method for attaching and detaching a split type shielding lid, which has a horizontal width from the upper surface side to the lower surface side.TheDecrease by unitFormed to letMain lid member with stepped parts on one end surface and the other end surface, and horizontal width from upper surface side to lower surface sideTheDecrease and increase by a given unitFormed to letA plurality of sub lid members each having one end surface and the other end surface, and the main lid member and the sub lid member are arranged with the step portions overlapping each other, thereby closing the loading / unloading port of the storage body. A method of attaching and detaching a split type shielding lid, wherein the storage body has a first loading / unloading port closed with a split type shielding lid arranged in a positive direction so that the main lid member is positioned on one end side; The plurality of second loading / unloading ports closed by the divided shielding lids arranged in the opposite direction so that the main lid member is located on the other end side have the same dimensions in the loading / unloading port longitudinal direction or loading / unloading width direction Arranged in parallel in either direction, the main lid members of the first loading / unloading port and the specific second loading / unloading port are each pulled out and temporarily placed in a standby position, thereby allowing each main lid member to be pulled out. A temporary placing step for forming an opening, and an opening for the first loading / unloading port. A loading / unloading step of loading / unloading the radioactive substance into / from the storage body, and removing the sub lid members adjacent to the openings of the first loading / unloading port and the second loading / unloading port, respectively, In the transfer step of transferring each to the opening of the loading / unloading port to form a new opening, the repetition step of repeating the loading / unloading step and the transfer step until completion or interruption of loading / unloading, and the repetition step After the opening position of the first loading / unloading port has moved to the extreme end, the main lid member of the next second loading / unloading port is transferred to the opening of the first loading / unloading port, and the specific second loading / unloading port is moved to the first. A separate container transfer step for performing the repetitive process between the new first loading / unloading port and the second loading / unloading port, after setting the next second loading / unloading port as the specific second loading / unloading port, After the iterative process, the main lid member at the standby position is moved to the first position. Each opening of the transfer port and a second transfer port is configured to have a transfer shielding process.
  According to the above configuration, since the radioactive substance can be carried in / out while sequentially forming the opening corresponding to the size of the main lid member and the sub lid member, the opening area of the carry-in / out port is minimized. Thus, radiation leakage can be sufficiently reduced. Claims1 toClaim3In this case, it is possible to eliminate the need for a turning device for turning the sub lid member on a horizontal plane. Furthermore, the detachment operation of the main lid member when the repetitive process performed between the first loading / unloading port and the second loading / unloading port is transferred between the new first loading / unloading port and the second loading / unloading port to be separate containers. There is an effect that can be reduced.
[0096]
  Claim5The present invention is a method for attaching and detaching a split type shielding lid, which has a horizontal width from the upper surface side to the lower surface side.TheDecrease by unitFormed to letMain lid member with stepped parts on one end surface and the other end surface, and horizontal width from upper surface side to lower surface sideTheDecrease and increase by a given unitFormed to letA plurality of sub lid members each having one end surface and the other end surface, and the main lid member and the sub lid member are arranged with the step portions overlapping each other, thereby closing the loading / unloading port of the storage body. A method of attaching and detaching a split type shielding lid, wherein the storage body has a first loading / unloading port closed with a split type shielding lid arranged in a positive direction so that the main lid member is positioned on one end side; A plurality of sets including a second loading / unloading port closed by a divided shielding lid arranged in the opposite direction so that the main lid member is located on the other end side have the same size and are in the longitudinal direction of the loading / unloading port. By being arranged in parallel in any direction of the loading / unloading width direction, the main lid members of the first loading / unloading port and the second loading / unloading port in the specific set of the plurality of sets are respectively removed and temporarily placed in the standby position , Temporary placing step of forming an opening at the removal position of each main lid member A first loading / unloading step of loading / unloading a radioactive substance into / from the storage body through the opening of the first loading / unloading port; and removing the sub lid member adjacent to the opening of the second loading / unloading port; A first transfer step of transferring to the opening of the loading / unloading port to form a new opening at the second loading / unloading port, and loading / unloading of the radioactive substance to / from the storage body through the opening of the second loading / unloading port. In the second loading / unloading step, the sub lid member adjacent to the opening of the first loading / unloading port is removed and transferred to the opening of the second loading / unloading port to form a new opening at the first loading / unloading port. A second transfer step, a repetition step for repeating the first transfer step, the first transfer step, the second transfer step, and the second transfer step until the end of loading / unloading or interruption, and the repetition step Later, the main lid member at the standby position is moved to the first loading / unloading port and the second loading / unloading port. A structure having a shielding step of respectively transferred to the mouth portion. Further, during the repetition process, when the first loading / unloading port and the second loading / unloading port move to the end portion and further work is performed, the first and second loading / unloading ports are closed using another set of main lid members. It is also possible to move to a separate warehouse by providing an opening in a new set of storage. It should be noted that the first transfer process and the second transfer process are not hindered even if the order is reversed.
  According to the above configuration, the claims4It is possible to carry in / out the radioactive material with fewer lid member attaching / detaching operations than in the case of the above, and carry in / out the radioactive material while sequentially forming openings corresponding to the size of the main lid member and sub lid member. Since it can be performed, there is an effect that radiation leakage can be sufficiently reduced by suppressing the opening area of the carry-in / out port to the necessary minimum.
[0097]
  Claim6The present invention is a method for attaching and detaching a split type shielding lid, which has a horizontal width from the upper surface side to the lower surface side.TheDecrease by unitFormed to letMain lid member with stepped parts on one end surface and the other end surface, and horizontal width from upper surface side to lower surface sideTheDecrease and increase by a given unitFormed to letA plurality of sub lid members each having one end surface and the other end surface, and the main lid member and the sub lid member are arranged with the step portions overlapping each other, thereby closing the loading / unloading port of the storage body. A split-type shielding lid attaching / detaching method, wherein the main lid member includes a first member formed in the same shape as the sub lid member, and a reverse convex type obtained by subtracting a width of the first member from the main lid member. The sub lid member is composed of a member,Configure each sub lid memberEach step portion is integrally coupled, and the storage body has a first loading / unloading port closed by a divided shielding lid arranged in a forward direction so that the main lid member is positioned on one end side. , A plurality of sets including a second loading / unloading port closed by a split type shielding lid arranged in the opposite direction so that the main lid member is located on the other end side have the same size and the loading / unloading port longitudinal direction Are arranged in parallel in any direction of the loading / unloading width direction, and each of the first loading / unloading port and the reverse loading-type member of the second loading / unloading port and the first loading / unloading port in the specific set of the plurality of sets A temporary placing step of forming an opening that enables loading and unloading of a radioactive substance at the first loading / unloading port by pulling out and temporarily placing it at the standby position, and the storage body through the opening of the first loading / unloading port. A first loading / unloading step for loading / unloading radioactive material and the second loading / unloading port; A first transfer step in which the first member or the sub lid member adjacent to the opening is removed and transferred to the opening of the first loading / unloading port to form a new opening at the second loading / unloading port; A second loading / unloading step of loading / unloading a radioactive substance into / from the storage body through the opening of the second loading / unloading port; and a sub lid member adjacent to the opening of the first loading / unloading port is removed, and the second loading / unloading port A second transfer step of transferring to the opening and forming a new opening at the first loading / unloading port; the first loading / unloading step; the first transfer step; the second loading / unloading step; An iterative process that repeats the transfer process until completion of loading / unloading, and a shielding process that transfers the main lid member at the standby position to the openings of the first loading / unloading port and the second loading / unloading port after the repeating process, respectively. It is the composition which has.
  According to said structure, a separate warehouse transfer process is also claimed.5Can be implemented according to the method described in4Claims corresponding to the size of the main lid member and the sub lid member, enabling the radioactive substance to be carried in and out with a smaller number of operations of attaching and detaching the lid member than the case of5Since radioactive substances can be carried in and out while sequentially forming fewer openings, it is possible to sufficiently reduce radiation leakage by suppressing the opening area of the carry-in / out opening to the minimum necessary. .
[Brief description of the drawings]
FIG. 1 is an explanatory view showing a basic structure of a split type shielding lid.
FIG. 2 is a perspective view of a pit type storage body.
FIG. 3 is a perspective view of a silo storage body.
4A and 4B are diagrams showing examples of engaging portions of a lid member, where FIG. 4A is a plan view, FIG. 4B is a cross-sectional view taken along line AA, and FIG. 4C is a cross-sectional view taken along line BB. It is.
FIGS. 5A and 5B are diagrams illustrating an example of a state in which a suspension member is engaged with an engagement portion, where FIG. 5A is a front view and FIG. 5B is a side view.
FIGS. 6A and 6B are explanatory views showing a basic carrying-in process of a radioactive substance, in which FIG. 6A shows a state before starting the carrying-in, FIG. 6B shows a state immediately after the carrying-in starts, and FIG. 6C forms a new opening. A state, (d) is a state of carrying in through a new opening, and (e) is a state where carrying-in is completed.
FIG. 7 is an explanatory view showing a state in which the split type shielding lid is closed in the middle of carrying in.
FIG. 8 is an explanatory diagram showing a problem of the split type shielding lid.
FIGS. 9A and 9B are configuration diagrams of the split type shielding lid, in which FIG. 9A is before the start of loading, and FIG. 9B is after the completion of loading.
FIGS. 10A and 10B are configuration diagrams of a split type shielding lid, in which FIG. 10A is before the start of loading, and FIG. 10B is after the completion of loading.
FIGS. 11A and 11B are explanatory diagrams showing a process of carrying in a radioactive substance, where FIG. 11A is a state before the start of carry-in, FIG. 11B is a state immediately after the start of carry-in, and FIG. , (D) shows a state where the carry-in is completed.
12A is a front view of a lid member, FIG. 12A is a front view of a sub lid member, and FIG. 12B is a front view of a main lid member;
FIG. 13 is an explanatory diagram showing a state in which the split type shielding lid is closed in the middle of carrying in.
FIG. 14 is an explanatory view showing an aspect of a stepped portion.
FIGS. 15A and 15B are configuration diagrams of a split type shielding lid, in which FIG. 15A is before the start of loading, and FIG. 15B is after the completion of loading.
FIG. 16 is an explanatory diagram showing an aspect of a stepped portion.
FIGS. 17A and 17B are configuration diagrams of a split type shielding lid, in which FIG. 17A is before the start of loading, and FIG. 17B is after the completion of loading.
FIGS. 18A and 18B are configuration diagrams of a split type shielding lid, in which FIG. 18A is before the start of loading, and FIG. 18B is after the completion of loading.
FIG. 19 is an explanatory diagram showing an arrangement state in the loading / unloading width direction of the split type shielding lid.
FIG. 20 is an explanatory diagram showing an arrangement state in the longitudinal direction of the loading / unloading port in the split type shielding lid.
FIG. 21 is an explanatory view showing an arrangement state of split type shielding lids.
22A and 22B are explanatory diagrams showing a process of carrying in a radioactive substance, where FIG. 22A is a state before the start of carry-in, FIG. 22B is a state immediately after the start of carry-in, and FIG. 22C is a state where a new opening is formed; d) is a state of carrying in through a new opening, and (e) is a state of carrying in through a new next opening.
FIG. 23 is an explanatory diagram showing a process of carrying in a radioactive substance.
FIG. 24 is an explanatory diagram showing a state in which the split type shielding lid is closed in the middle of carrying in.
FIG. 25 is an explanatory view showing an arrangement state of the divided shielding lids.
FIG. 26 is an explanatory diagram showing an arrangement state of the divided shielding lids.
FIG. 27 is an explanatory view showing an arrangement state of the divided shielding lids.
FIG. 28 is an explanatory view showing an arrangement state of the split type shielding lids.
FIG. 29 is an explanatory view showing a process of carrying in a radioactive substance, where (a) is a state before the start of carry-in, (b) is a state immediately after the start of carry-in, and (c) is a state carried through a new opening. , (D) is a state of carrying in through a new next opening.
FIGS. 30A and 30B are explanatory diagrams showing a process of carrying in a radioactive substance, in which FIG. 30A shows a state where the radioactive substance is carried in through the opening, and FIG. 30B shows a state where the carrying-in is completed.
FIG. 31 is an explanatory diagram showing the relationship between the size of each lid member of the split-type shielding lid and the size of the radioactive substance.
FIG. 32 is an explanatory diagram showing the relationship between the size of each lid member of the split type shielding lid and the size of the radioactive substance when the joining surface is inclined and the main lid member is divided.
FIG. 33 is an explanatory diagram showing the relationship between the size of each lid member of the split-type shielding lid and the size of the radioactive substance.
FIGS. 34A and 34B are diagrams showing a structure of a conventional split type shielding lid, where FIG. 34A is a plan view, FIG. 34B is a cross-sectional view taken along line YY, and FIG. 34C is a cross-sectional view taken along line XX. It is.
FIG. 35 is an explanatory diagram showing a state in which radiation leaks.
[Explanation of symbols]
1 Storage body
1a First loading / unloading exit
2a to 2e First to fifth lid members
2a ′ to 2e ′ 6th to 10th lid members
3 outer wall
4 partition walls
5 Beam members
6 Suspension member
7 Upper layer
8 Lower layer
9 Engagement part
10 Radioactive material
12 Reverse convex member
14-18 First to fifth lid members
21 Main lid member
22 Sub lid member

Claims (6)

上面側から下面側にかけて水平幅を所定量単位で減少させるように形成された段部を一端面および他端面にそれぞれ備えた主蓋部材と、上面側から下面側にかけて水平幅を所定量単位で減少および増加させるように形成された段部を一端面および他端面にそれぞれ備えた複数の副蓋部材とを有し、これら主蓋部材および副蓋部材を段部同士を重複させながら配列することにより貯蔵庫本体の搬入出口を塞ぐ分割式遮蔽蓋の着脱方法であって、
前記主蓋部材は、各段部ごとに層状に分割された層状主部材からなり、前記副蓋部材は、各副蓋部材を構成する各段部が一体的に結合されており、
前記主蓋部材を抜脱して待機位置に仮置きすることによって、該主蓋部材の抜脱位置に開口部を形成する仮置き工程と、
前記開口部を介して貯蔵庫本体に対する放射性物質の搬入出を行う搬入出工程と、
前記開口部に隣接する副蓋部材を抜脱して水平面で旋回した後、該開口部に移載して新たな開口部を形成する旋回移載工程と、
前記搬入出工程と前記旋回移載工程とを搬入出の終了または中断まで繰り返す反復工程と、
前記反復工程後に前記待機位置の主蓋部材を前記開口部に移載する遮蔽工程と
を有することを特徴とする分割式遮蔽蓋の着脱方法。 A main lid member having a step portion formed on each of the one end face and the other end face so as to reduce the horizontal width from the upper surface side to the lower surface side, and the horizontal width from the upper surface side to the lower surface side in the predetermined amount unit. A plurality of sub lid members each provided with a step portion formed on one end surface and the other end surface so as to decrease and increase, and arranging the main lid member and the sub lid member while overlapping the step portions. Is a method for attaching and detaching a split type shielding lid that closes the loading / unloading port of the storage body ,
The main lid member is composed of a layered main member divided into layers for each step portion, and the sub cover member is integrally joined to each step portion constituting each sub cover member,
Temporary placing step of forming an opening at the removal position of the main lid member by pulling out the main lid member and temporarily placing it at the standby position;
A loading / unloading step for loading / unloading radioactive substances to / from the storage body through the opening,
A swivel transfer step of removing a sub lid member adjacent to the opening and turning on a horizontal plane, and then transferring to the opening to form a new opening.
Repeating the loading / unloading step and the swivel transfer step until the loading / unloading is completed or interrupted;
And a shielding step of transferring the main lid member at the standby position to the opening after the repeating step. 上面側から下面側にかけて水平幅を所定量単位で減少させるように形成された段部を一端面および他端面にそれぞれ備えた主蓋部材と、上面側から下面側にかけて水平幅を所定量単位で減少および増加させるように形成された段部を一端面および他端面にそれぞれ備えた複数の副蓋部材とを有し、これら主蓋部材および副蓋部材を段部同士を重複させながら配列することにより貯蔵庫本体の搬入出口を塞ぐ分割式遮蔽蓋の着脱方法であって、A main lid member having a step portion formed on each of the one end surface and the other end surface so as to reduce the horizontal width in a predetermined amount unit from the upper surface side to the lower surface side, and the horizontal width in a predetermined amount unit from the upper surface side to the lower surface side. A plurality of sub lid members each provided with a step portion formed on one end surface and the other end surface so as to decrease and increase, and arranging the main lid member and the sub lid member while overlapping the step portions. Is a method of attaching and detaching a split type shielding lid that closes the loading / unloading port of the storage body
前記主蓋部材は、前記副蓋部材と同一形状に形成された第１部材と、前記主蓋部材から前記第１部材の幅を差し引いた逆凸型部材とからなり、前記副蓋部材は、各副蓋部材を構成する各段部が一体的に結合されており、The main lid member includes a first member formed in the same shape as the sub lid member, and an inverted convex member obtained by subtracting the width of the first member from the main lid member, Each step portion constituting each sub lid member is integrally coupled,
前記主蓋部材を抜脱して待機位置に仮置きすることによって、該主蓋部材の抜脱位置に開口部を形成する仮置き工程と、Temporary placing step of forming an opening at the removal position of the main lid member by pulling out the main lid member and temporarily placing it at the standby position;
前記開口部を介して貯蔵庫本体に対する放射性物質の搬入出を行う搬入出工程と、A loading / unloading step for loading / unloading radioactive substances to / from the storage body through the opening,
前記開口部に隣接する副蓋部材を抜脱して水平面で旋回した後、該開口部に移載して新たな開口部を形成する旋回移載工程と、A swivel transfer step of removing a sub lid member adjacent to the opening and turning on a horizontal plane, and then transferring to the opening to form a new opening.
前記搬入出工程と前記旋回移載工程とを搬入出の終了または中断まで繰り返す反復工程と、Repeating the loading / unloading step and the swivel transfer step until completion of loading / unloading or interruption, and
前記反復工程後に前記待機位置の主蓋部材を前記開口部に移載する遮蔽工程とA shielding step of transferring the main lid member at the standby position to the opening after the repeating step;
を有することを特徴とする分割式遮蔽蓋の着脱方法。A method for attaching and detaching a split type shielding lid characterized by comprising: 上面側から下面側にかけて水平幅を所定量単位で減少させるように形成された段部を一端面および他端面にそれぞれ備えた主蓋部材と、上面側から下面側にかけて水平幅を所定量単位で減少および増加させるように形成された段部を一端面および他端面にそれぞれ備えた複数の副蓋部材とを有し、これら主蓋部材および副蓋部材を段部同士を重複させながら配列することにより貯蔵庫本体の搬入出口を塞ぐ分割式遮蔽蓋の着脱方法であって、
前記主蓋部材を抜脱して待機位置に仮置きすることによって、該主蓋部材の抜脱位置に開口部を形成する仮置き工程と、
前記開口部を介して貯蔵庫本体に対する放射性物質の搬入出を行う搬入出工程と、
前記開口部に隣接する副蓋部材を抜脱して水平面で旋回した後、該開口部に移載して新たな開口部を形成する旋回移載工程と、
前記搬入出工程と前記旋回移載工程とを搬入出の終了または中断まで繰り返す反復工程と、
前記反復工程後に前記待機位置の主蓋部材を前記開口部に移載する遮蔽工程と
を有することを特徴とする分割式遮蔽蓋の着脱方法。A main lid member provided on each of the one end surface and the other end surface so as to reduce the horizontal width in a predetermined amount unit from the upper surface side to the lower surface side, and the horizontal width in a predetermined amount unit from the upper surface side to the lower surface side A plurality of sub lid members each provided with a step portion formed on one end surface and the other end surface so as to be reduced and increased at the same time, and arranging the main lid member and the sub lid member while overlapping the step portions. It is a method of attaching and detaching a split type shielding lid that closes the carry-in / out port of the storage body by doing,
Temporary placing step of forming an opening at the removal position of the main lid member by pulling out the main lid member and temporarily placing it at the standby position;
A loading / unloading step for loading / unloading radioactive substances to / from the storage body through the opening,
A swivel transfer step of removing a sub lid member adjacent to the opening and turning on a horizontal plane, and then transferring to the opening to form a new opening.
Repeating the loading / unloading step and the swivel transfer step until the loading / unloading is completed or interrupted;
And a shielding step of transferring the main lid member at the standby position to the opening after the repeating step. 上面側から下面側にかけて水平幅を所定量単位で減少させるように形成された段部を一端面および他端面にそれぞれ備えた主蓋部材と、上面側から下面側にかけて水平幅を所定量単位で減少および増加させるように形成された段部を一端面および他端面にそれぞれ備えた複数の副蓋部材とを有し、これら主蓋部材および副蓋部材を段部同士を重複させながら配列することにより貯蔵庫本体の搬入出口を塞ぐ分割式遮蔽蓋の着脱方法であって、
前記貯蔵庫本体には、前記主蓋部材が一端側に位置するように正方向に配列された分割式遮蔽蓋で塞がれた第１搬入出口と、前記主蓋部材が他端側に位置するように逆方向に配列された分割式遮蔽蓋で塞がれた複数の第２搬入出口とが、同一寸法で搬入出口長手方向か搬入出口幅方向の何れかの方向に並列配置されており、
前記第１搬入出口および特定の第２搬入出口の主蓋部材をそれぞれ抜脱して待機位置に仮置きすることによって、各主蓋部材の抜脱位置に開口部を形成する仮置き工程と、
前記第１搬入出口の開口部を介して貯蔵庫本体に対する放射性物質の搬入出を行う搬入出工程と、
前記第１搬入出口および前記第２搬入出口の開口部に隣接する副蓋部材をそれぞれ抜脱し、前記第２搬入出口および第１搬入出口の開口部にそれぞれ移載して新たな開口部を形成する移載工程と、
前記搬入出工程と前記移載工程とを搬入出の終了または中断まで繰り返す反復工程と、
前記反復工程において第１搬入出口の開口位置が最端部まで移動した後に、前記第１搬入出口の開口部に次の第２搬入出口の主蓋部材を移載し、前記特定の第２搬入出口を第１搬入出口とし、前記次の第２搬入出口を特定の第２搬入出口とした後、これら新たな第１搬入出口と第２搬入出口との間で前記反復工程を行う別庫移行工程と、
前記反復工程後に、前記待機位置の主蓋部材を前記第１搬入出口および第２搬入出口の開口部にそれぞれ移載する遮蔽工程と
を有することを特徴とする分割式遮蔽蓋の着脱方法。A main lid member provided on each of the one end surface and the other end surface so as to reduce the horizontal width in a predetermined amount unit from the upper surface side to the lower surface side, and the horizontal width in a predetermined amount unit from the upper surface side to the lower surface side A plurality of sub lid members each provided with a step portion formed on one end surface and the other end surface so as to be reduced and increased at the same time, and arranging the main lid member and the sub lid member while overlapping the step portions. It is a method of attaching and detaching a split type shielding lid that closes the carry-in / out port of the storage body by doing,
The storage body has a first loading / unloading port closed by a split type shielding lid arranged in the forward direction so that the main lid member is located on one end side, and the main lid member is located on the other end side. The plurality of second loading / unloading ports closed by the division type shielding lids arranged in the opposite direction as described above are arranged in parallel in either the loading / unloading port longitudinal direction or the loading / unloading width direction with the same dimensions,
Temporary placing step of forming an opening at the withdrawal position of each main lid member by pulling out the main lid members of the first carry-in exit and the specific second carry-out exit and temporarily placing them at the standby position;
A loading / unloading step of loading / unloading a radioactive substance to / from the storage body through the opening of the first loading / unloading port;
The sub lid members adjacent to the opening portions of the first loading / unloading port and the second loading / unloading port are respectively removed and transferred to the opening portions of the second loading / unloading port and the first loading / unloading port to form new openings. A transfer process,
Repeating the loading / unloading step and the transfer step until completion of loading / unloading or interruption,
After the opening position of the first loading / unloading port has moved to the end in the repetition step, the main lid member of the next second loading / unloading port is transferred to the opening of the first loading / unloading port, and the specific second loading After changing the exit to the first loading / unloading port and the next second loading / unloading port to the specific second loading / unloading port, the relocation process is performed between the new first loading / unloading port and the second loading / unloading port. Process,
A method for attaching and detaching a split type shielding lid, comprising: a shielding step of transferring the main lid member at the standby position to the openings of the first loading / unloading port and the second loading / unloading port after the repeating step. 上面側から下面側にかけて水平幅を所定量単位で減少させるように形成された段部を一端面および他端面にそれぞれ備えた主蓋部材と、上面側から下面側にかけて水平幅を所定量単位で減少および増加させるように形成された段部を一端面および他端面にそれぞれ備えた複数の副蓋部材とを有し、これら主蓋部材および副蓋部材を段部同士を重複させながら配列することにより貯蔵庫本体の搬入出口を塞ぐ分割式遮蔽蓋の着脱方法であって、
前記貯蔵庫本体には、前記主蓋部材が一端側に位置するように正方向に配列された分割式遮蔽蓋で塞がれた第１搬入出口と、前記主蓋部材が他端側に位置するように逆方向に配列された分割式遮蔽蓋で塞がれた第２搬入出口とを一組とする複数組が、同一寸法で搬入出口長手方向か搬入出口幅方向の何れかの方向に並列配置されており、
前記複数組中の特定組における第１搬入出口および第２搬入出口の主蓋部材をそれぞれ抜脱して待機位置に仮置きすることによって、各主蓋部材の抜脱位置に開口部を形成する仮置き工程と、
前記第１搬入出口の開口部を介して貯蔵庫本体に対する放射性物質の搬入出を行う第１搬入出工程と、
前記第２搬入出口の開口部に隣接する副蓋部材を抜脱し、前記第１搬入出口の開口部に移載して新たな開口部を第２搬入出口に形成する第１移載工程と、
前記第２搬入出口の開口部を介して貯蔵庫本体に対する放射性物質の搬入出を行う第２搬入出工程と、
前記第１搬入出口の開口部に隣接する副蓋部材を抜脱し、前記第２搬入出口の開口部に移載して新たな開口部を第１搬入出口に形成する第２移載工程と、
前記第１搬入出工程、前記第１移載工程、前記第２搬入出工程および前記第２移載工程を搬入出の終了または中断まで繰り返す反復工程と、
前記反復工程後に前記待機位置の主蓋部材を前記第１搬入出口および第２搬入出口の開口部にそれぞれ移載する遮蔽工程と
を有することを特徴とする分割式遮蔽蓋の着脱方法。A main lid member provided on each of the one end surface and the other end surface so as to reduce the horizontal width in a predetermined amount unit from the upper surface side to the lower surface side, and the horizontal width in a predetermined amount unit from the upper surface side to the lower surface side A plurality of sub lid members each provided with a step portion formed on one end surface and the other end surface so as to be reduced and increased at the same time, and arranging the main lid member and the sub lid member while overlapping the step portions. It is a method of attaching and detaching a split type shielding lid that closes the carry-in / out port of the storage body by doing,
The storage body has a first loading / unloading port closed by a split type shielding lid arranged in the forward direction so that the main lid member is located on one end side, and the main lid member is located on the other end side. In this way, a plurality of sets including the second loading / unloading port closed by the divided shielding lids arranged in the opposite direction are arranged in parallel in either the longitudinal direction of the loading / unloading port or the width direction of the loading / unloading port. Has been placed,
Temporarily forming an opening at the removal position of each main lid member by pulling out the main lid members of the first carry-in exit and the second carry-out exit in the specific set of the plurality of sets and temporarily placing them in the standby position. Placing process;
A first loading / unloading step of loading / unloading a radioactive substance to / from the storage body through the opening of the first loading / unloading port;
A first transfer step in which the sub lid member adjacent to the opening of the second loading / unloading port is removed and transferred to the opening of the first loading / unloading port to form a new opening at the second loading / unloading port;
A second loading / unloading step of loading / unloading a radioactive substance to / from the storage body through the opening of the second loading / unloading port;
A second transfer step in which the sub lid member adjacent to the opening of the first loading / unloading port is removed and transferred to the opening of the second loading / unloading port to form a new opening at the first loading / unloading port;
Repeating the first loading / unloading step, the first transfer step, the second loading / unloading step and the second transfer step until the loading / unloading is completed or interrupted;
A method for attaching and detaching a split type shielding lid, comprising: a shielding step of transferring the main lid member at the standby position to the openings of the first loading / unloading port and the second loading / unloading port after the repeating step. 上面側から下面側にかけて水平幅を所定量単位で減少させるように形成された段部を一端面および他端面にそれぞれ備えた主蓋部材と、上面側から下面側にかけて水平幅を所定量単位で減少および増加させるように形成された段部を一端面および他端面にそれぞれ備えた複数の副蓋部材とを有し、これら主蓋部材および副蓋部材を段部同士を重複させながら配列することにより貯蔵庫本体の搬入出口を塞ぐ分割式遮蔽蓋の着脱方法であって、
前記主蓋部材は、前記副蓋部材と同一形状に形成された第１部材と、前記主蓋部材から前記第１部材の幅を差し引いた逆凸型部材とからなり、前記副蓋部材は、各副蓋部材を構成する各段部が一体的に結合されており、
前記貯蔵庫本体には、前記主蓋部材が一端側に位置するように正方向に配列された分割式遮蔽蓋で塞がれた第１搬入出口と、前記主蓋部材が他端側に位置するように逆方向に配列された分割式遮蔽蓋で塞がれた第２搬入出口とを一組とする複数組が、同一寸法で搬入出口長手方向か搬入出口幅方向の何れかの方向に並列配置されており、
前記複数組中の特定組における第１搬入出口および第２搬入出口の逆凸型部材および第１搬入出口の第１部材をそれぞれ抜脱して待機位置に仮置きすることによって、第１搬入出口に放射性物質の搬入出を可能とする開口部を形成する仮置き工程と、
前記第１搬入出口の開口部を介して貯蔵庫本体に対する放射性物質の搬入出を行う第１搬入出工程と、
前記第２搬入出口の開口部に隣接する第１部材または副蓋部材を抜脱し、前記第１搬入出口の開口部に移載して新たな開口部を第２搬入出口に形成する第１移載工程と、
前記第２搬入出口の開口部を介して貯蔵庫本体に対する放射性物質の搬入出を行う第２搬入出工程と、
前記第１搬入出口の開口部に隣接する副蓋部材を抜脱し、前記第２搬入出口の開口部に移載して新たな開口部を第１搬入出口に形成する第２移載工程と、
前記第１搬入出工程、前記第１移載工程、前記第２搬入出工程および前記第２移載工程を搬入出の終了または中断まで繰り返す反復工程と、
前記反復工程後に前記待機位置の主蓋部材を前記第１搬入出口および第２搬入出口の開口部にそれぞれ移載する遮蔽工程と
を有することを特徴とする分割式遮蔽蓋の着脱方法。A main lid member provided on each of the one end surface and the other end surface so as to reduce the horizontal width in a predetermined amount unit from the upper surface side to the lower surface side, and the horizontal width in a predetermined amount unit from the upper surface side to the lower surface side A plurality of sub lid members each provided with a step portion formed on one end surface and the other end surface so as to be reduced and increased at the same time, and arranging the main lid member and the sub lid member while overlapping the step portions. It is a method of attaching and detaching a split type shielding lid that closes the carry-in / out port of the storage body by doing,
The main lid member includes a first member formed in the same shape as the sub lid member, and an inverted convex member obtained by subtracting the width of the first member from the main lid member, Each step portion constituting each sub lid member is integrally coupled,
The storage body has a first loading / unloading port closed by a split type shielding lid arranged in the forward direction so that the main lid member is located on one end side, and the main lid member is located on the other end side. In this way, a plurality of sets including the second loading / unloading port closed by the divided shielding lids arranged in the opposite direction are arranged in parallel in either the longitudinal direction of the loading / unloading port or the width direction of the loading / unloading port. Has been placed,
By removing and temporarily placing the first convex / inverted members of the first and second loading / unloading ports and the first member of the first loading / unloading port in the specific group of the plurality of sets and temporarily placing them in the standby position, A temporary placing step for forming an opening that enables loading and unloading of radioactive materials;
A first loading / unloading step of loading / unloading a radioactive substance to / from the storage body through the opening of the first loading / unloading port;
A first transfer that removes the first member or the sub lid member adjacent to the opening of the second loading / unloading port and transfers it to the opening of the first loading / unloading port to form a new opening at the second loading / unloading port. Loading process;
A second loading / unloading step of loading / unloading a radioactive substance to / from the storage body through the opening of the second loading / unloading port;
A second transfer step in which the sub lid member adjacent to the opening of the first loading / unloading port is removed and transferred to the opening of the second loading / unloading port to form a new opening at the first loading / unloading port;
Repeating the first loading / unloading step, the first transfer step, the second loading / unloading step and the second transfer step until the loading / unloading is completed or interrupted;
A method for attaching and detaching a split type shielding lid, comprising: a shielding step of transferring the main lid member at the standby position to the openings of the first loading / unloading port and the second loading / unloading port after the repeating step.
JP32360798A 1998-11-13 1998-11-13 Attaching / detaching the split-type shielding lid of the radioactive material storage Expired - Lifetime JP3842458B2 (en)

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