JP2006058010A - Shielding lid for concrete-made storage facility - Google Patents

Shielding lid for concrete-made storage facility Download PDF

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JP2006058010A
JP2006058010A JP2004236946A JP2004236946A JP2006058010A JP 2006058010 A JP2006058010 A JP 2006058010A JP 2004236946 A JP2004236946 A JP 2004236946A JP 2004236946 A JP2004236946 A JP 2004236946A JP 2006058010 A JP2006058010 A JP 2006058010A
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concrete
exhaust
shielding
cask
shielding lid
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JP4366493B2 (en
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Koji Shirai
孝治 白井
Masumi Watari
真澄 亘
Hirofumi Takeda
浩文 竹田
Yasuaki Fukushima
泰明 福島
Hitoshi Shimizu
清水　　仁
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Kajima Corp
Central Research Institute of Electric Power Industry
Hitachi Ltd
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Central Research Institute of Electric Power Industry
Hitachi Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To improve an efficiency in the exhaust of cooled air especially as to a concrete-made storage facility (cask) to store cylindrical metal canisters accommodating radioactive substances. <P>SOLUTION: A shielding lid is used for the concrete facility which has a cylindrical storage section to store the cylindrical metal canisters 25 accommodating radioactive substances and has a structure that allows cooling air to be sucked from a lower suction port 34 of the storage section by natural convection and forces cooled air to be exhausted outside from an upper exhaust port by way of a cooling flow channel around the metal canisters 25 accommodated in the storage section. The lid is constituted by placing at plural points exhaust holes 27 to exhaust the cooled air upward from the cooling flow channel 26 around the metal canisters 25 and by locating plural bar-shaped shields 28 for each of the exhaust holes 27 in the points so that they cannot be seen through in the direction of the openings of the exhaust holes 27. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、放射性物質を収納した筒状の金属製キャニスタを貯蔵するためのコンクリート製貯蔵設備（キャスク）に関し、特にこのコンクリート製貯蔵設備の遮蔽蓋の構造に関するものである。   The present invention relates to a concrete storage facility (cask) for storing a cylindrical metal canister containing a radioactive substance, and more particularly to the structure of a shielding lid of the concrete storage facility.

原子力発電所等で使用された核燃料の使用済燃料を再処理し、回収されるプルトニウム等の再利用が計られているが、この使用済燃料は再処理するまでの間、適切に貯蔵・保管する必要がある。この使用済燃料の燃料集合体を貯蔵・保管する貯蔵設備は、通常、金属製のキャニスタに密封収容され、更に金属製のキャニスタは金属キャスク又はコンクリートキャスクに収容して、外部への放射線の遮蔽を行うと共に、空気の対流による使用済燃料の冷却を行うようにしている。
この貯蔵設備としてのキャスクは、わが国においては、金属製キャスクに比較して貯蔵設備コストの点で有利な鉄筋コンクリート製又は充填コンクリート製のコンクリートキャスクの使用が今後見込まれている。 The spent fuel of nuclear fuel used in nuclear power plants, etc. is reprocessed, and the recovered plutonium, etc. is reused. This spent fuel is properly stored and stored until it is reprocessed. There is a need to. The storage facility for storing and storing the spent fuel assembly is usually sealed in a metal canister, and the metal canister is housed in a metal cask or concrete cask to shield radiation from the outside. In addition, the spent fuel is cooled by air convection.
As for the cask as the storage facility, in Japan, the use of a concrete cask made of reinforced concrete or filled concrete, which is advantageous in terms of the cost of the storage facility compared with the metal cask, is expected in the future.

使用済燃料を収容する金属製のキャニスタの大きさは、通常、外径１．７ｍ，長さ４．５ｍ程度の円筒状であり、このキャニスタを収容するコンクリートキャスクの大きさは、外径４ｍ，高さ６ｍ程度の円筒状のものが多い。
従来のコンクリートキャスクの構造の一例を図５及び図６に示す。図５（ａ）はコンクリートキャスク１の上面図、図５（ｂ）はその側面の縦断面図であり、図６はコンクリートキャスク１の一部を切欠した断面斜視図である。図５及び図６において２は有底の円筒状に形成されたコンクリート製のキャスク本体であり、その底部に後述する金属製のキャニスタを支持する支持台３が設けられている。 The size of the metal canister that accommodates the spent fuel is usually a cylindrical shape having an outer diameter of 1.7 m and a length of about 4.5 m. The size of the concrete cask that accommodates the canister is 4 m in outer diameter. ， Many cylinders are about 6m high.
An example of the structure of a conventional concrete cask is shown in FIGS. 5A is a top view of the concrete cask 1, FIG. 5B is a longitudinal sectional view of the side, and FIG. 6 is a cross-sectional perspective view in which a part of the concrete cask 1 is cut away. 5 and 6, reference numeral 2 denotes a concrete cask main body formed in a bottomed cylindrical shape, and a support base 3 for supporting a metal canister described later is provided on the bottom thereof.

４は円筒状の鋼板の内部に遮蔽用のコンクリートが充填された遮蔽蓋であり、コンクリート部５と鋼板６より構成されており、キャスク本体２の上面に載せられ、ボルト７で固定される。８は炭素鋼製ライナ，９は吸気口であり、キャスク本体２の下部４箇所に設けられている。１０は排気口であり、キャスク本体２に遮蔽蓋４を載置したとき、両者の接触面の４箇所において階段状の開口部として形成されるようになっている。１１は冷却用空気の冷却流路であり、キャスク本体２の内壁面と金属製キャニスタの外壁面との間に形成される。１２は遮蔽蓋４をキャスク本体２の上面に固定するボルト、１３は遮蔽蓋４を吊上げるために鋼板６の上面４箇所に設けられたアイプレートである。１４はコンクリートキャスク１に収容される金属製のキャニスタである。   Reference numeral 4 denotes a shielding lid in which a shielding steel is filled in a cylindrical steel plate, which is composed of a concrete portion 5 and a steel plate 6, and is placed on the upper surface of the cask body 2 and fixed with bolts 7. Reference numeral 8 denotes a carbon steel liner, and 9 denotes an air inlet, which is provided at four lower portions of the cask body 2. Reference numeral 10 denotes an exhaust port, which is formed as a stepped opening at four locations on the contact surface when the shielding lid 4 is placed on the cask body 2. Reference numeral 11 denotes a cooling flow path for cooling air, which is formed between the inner wall surface of the cask body 2 and the outer wall surface of the metal canister. Reference numeral 12 denotes a bolt for fixing the shielding lid 4 to the upper surface of the cask body 2, and 13 is an eye plate provided at four locations on the upper surface of the steel plate 6 for lifting the shielding lid 4. A metal canister 14 is accommodated in the concrete cask 1.

この従来例のコンクリートキャスク１は、遮蔽蓋４の上面に設けられたアイプレート１３を利用して、図示していないクレーンなどにより遮蔽蓋４を一時的に除去して内部にキャニスタ１４を収容した後、遮蔽蓋４を固定してキャニスタ１４を長期間貯蔵・保管する。この貯蔵状態においては、キャスク本体２の下部に設けられた複数（４箇所）の吸気口９から自然対流により吸気された空気は、キャニスタ１４内に収納された使用済燃料から出る崩壊熱によって熱せられて、その外壁面とキャスク本体２の内壁面との間に形成される冷却用空気の冷却流路１１を通って、キャスク本体２上部と遮蔽蓋４との間に形成される４箇所の複数の排気口１０から排気され、長期間に亘って冷却される。また、キャニスタ１４内の使用済燃料からの放射線は、吸気口９及び排気口１０の形状が２段階に折れ曲っているため、外部への放射漏れの影響は軽減される（例えば、特許文献１参照）。
特開２００２−７１８９６号公報 The concrete cask 1 of this conventional example uses the eye plate 13 provided on the upper surface of the shielding lid 4 to temporarily remove the shielding lid 4 by a crane (not shown) and accommodate the canister 14 inside. Thereafter, the shielding lid 4 is fixed and the canister 14 is stored and stored for a long period of time. In this storage state, air sucked by natural convection from a plurality (four places) of the inlets 9 provided in the lower part of the cask main body 2 is heated by decay heat emitted from the spent fuel stored in the canister 14. The four locations formed between the upper part of the cask body 2 and the shielding lid 4 through the cooling air cooling channel 11 formed between the outer wall surface and the inner wall surface of the cask body 2. The gas is exhausted from the plurality of exhaust ports 10 and cooled over a long period of time. Moreover, since the shape of the intake port 9 and the exhaust port 10 bends the radiation from the spent fuel in the canister 14 in two stages, the influence of radiation leakage to the outside is reduced (for example, Patent Document 1). reference).
JP 2002-71896 A

しかしながら、従来のコンクリートキャスク１は、キャスク本体２の上部側面に設けられている排気口１０付近、及びコンクリート製の遮蔽蓋４部分の温度が高くなるという問題がある。即ち、このキャスク本体２のコンクリート部の温度は、現在関係機関で検討され、このコンクリート部の温度の上限を９０℃とする案が検討されているが、キャスク本体２の上部側面や遮蔽蓋４の温度は、１２０℃を超える場合もあるため、この種貯蔵設備へのコンクリートキャスク１は適合しなくなるという問題がある。   However, the conventional concrete cask 1 has a problem that the temperature of the vicinity of the exhaust port 10 provided on the upper side surface of the cask main body 2 and the portion of the concrete cover 4 is increased. That is, the temperature of the concrete portion of the cask main body 2 is currently studied by related organizations, and a plan for setting the upper limit of the temperature of the concrete portion to 90 ° C. is being studied. Since the temperature of may exceed 120 ° C., there is a problem that the concrete cask 1 for this kind of storage facility is not suitable.

本発明の目的は、キャスク本体２の上部側面付近やその遮蔽蓋の温度を、少なくとも９０℃以下になるような構造のコンクリート製の遮蔽蓋を提供することである。   An object of the present invention is to provide a concrete shielding lid having a structure in which the temperature of the upper side surface of the cask body 2 and the temperature of the shielding lid are at least 90 ° C. or less.

この目的を達成するために、本願の第１の発明によるコンクリート製貯蔵設備の遮蔽蓋は、放射性物質を収納した円筒状の金属製キャニスタを貯蔵するための円筒状の貯蔵部を有し、該貯蔵部の下部吸気口から冷却用空気を自然対流により吸入し、該貯蔵部に収容される前記金属製キャニスタの周囲の冷却流路を経由して、上部排気口から外部に冷却済空気を排気せしめる構造のコンクリート製貯蔵設備の遮蔽蓋において、
前記金属製キャニスタの周囲の冷却流路の直上から鉛直方向に前記冷却済空気を排気する排気孔を複数箇所に設けると共に、該複数箇所の排気孔にそれぞれ棒状の遮蔽材を該排気孔の開口方向で見通すことができないように複数本配置して構成したものである。 In order to achieve this object, the shielding lid of the concrete storage facility according to the first invention of the present application has a cylindrical storage portion for storing a cylindrical metal canister containing a radioactive substance, Cooling air is sucked by natural convection from the lower intake port of the storage unit, and the cooled air is exhausted from the upper exhaust port to the outside via the cooling channel around the metal canister accommodated in the storage unit. In the shielding lid of the concrete storage equipment of the structure
Exhaust holes for exhausting the cooled air in a vertical direction from directly above the cooling flow path around the metal canister are provided at a plurality of locations, and bar-shaped shielding materials are respectively provided in the exhaust holes at the plurality of locations. A plurality of them are arranged so that they cannot be seen in the direction.

前記の目的を達成するために、本願の第２の発明によるコンクリート製貯蔵設備の遮蔽蓋は、放射性物質を収納した円筒状の金属製キャニスタを貯蔵するための円筒状の貯蔵部を有し、該貯蔵部の下部吸気口から冷却用空気を自然対流により吸入し、該貯蔵部に収容される前記金属製キャニスタの周囲の冷却流路を経由して、上部排気口から外部に冷却済空気を排気せしめる構造のコンクリート製貯蔵設備の遮蔽蓋において、
前記金属製キャニスタの周囲の冷却流路の直径と同程度の直径を有する円盤状であって、該円盤の周縁部の複数箇所に厚さ方向に排気溝を設け、該各排気溝にそれぞれ棒状の遮蔽材を該排気溝の上下方向で見通すことができないように複数本配置して構成したものである。 To achieve the above object, the shielding cover of the concrete storage facility according to the second invention of the present application has a cylindrical storage portion for storing a cylindrical metal canister containing a radioactive substance, Cooling air is sucked by natural convection from the lower intake port of the storage unit, and cooled air is discharged from the upper exhaust port to the outside via the cooling channel around the metal canister accommodated in the storage unit. In the shielding lid of the concrete storage facility with the structure to exhaust,
A disk shape having a diameter approximately equal to the diameter of the cooling flow path around the metal canister, wherein exhaust grooves are provided in a thickness direction at a plurality of peripheral portions of the disk, and each exhaust groove has a rod shape. A plurality of the shielding materials are arranged so that they cannot be seen in the vertical direction of the exhaust groove.

以上説明したように、本発明によれば、金属製キャニスタの外周面とコンクリートキャスクの内壁との間に形成される冷却用空気の冷却流路の直上から鉛直方向に当該冷却済空気を排気する排気孔又は排気溝を設けたものであるため、冷却済空気の排気が効率的に行えるものであり、コンクリートキャスクの上部側面やコンクリート製の遮蔽蓋の温度を低下させることができる。また、排気孔又は排気溝には棒状の遮蔽材を開口方向で見通すことができないように複数設けられているため、外部への放射漏れの影響は従来と同程度である。   As described above, according to the present invention, the cooled air is exhausted in the vertical direction from directly above the cooling flow path of the cooling air formed between the outer peripheral surface of the metal canister and the inner wall of the concrete cask. Since the exhaust hole or the exhaust groove is provided, the cooled air can be efficiently exhausted, and the temperature of the upper side surface of the concrete cask and the concrete shielding lid can be lowered. Further, since a plurality of rod-shaped shielding materials are provided in the exhaust holes or exhaust grooves so that they cannot be seen through in the opening direction, the influence of radiation leakage to the outside is almost the same as in the past.

〔実施例１〕
図１は、本発明の第１の実施例を示すものであり、図１（ａ）はコンクリートキャスク２０の上面図，図１（ｂ）はその側面縦断面図，図１（ｃ）はコンクリート製のキャスク本体上部の斜視図，図１（ｄ）はコンクリート製の遮蔽蓋の斜視図を示すものである。
図１において、２１はコンクリート製のキャスク本体，２２は円盤状の遮蔽蓋であり、内部にコンクリートが充填された鋼板製の円筒部２３とその上面の鋼板製の蓋板２４で構成されている。遮蔽蓋２２は、図示していないボルト等によりキャスク本体２１に固定されている。２５は金属製のキャニスタ，２６は金属製キャニスタ２５の外壁面とキャスク本体２１の内壁面との間に形成された冷却用空気の冷却流路である。 [Example 1]
FIG. 1 shows a first embodiment of the present invention. FIG. 1 (a) is a top view of a concrete cask 20, FIG. 1 (b) is a side longitudinal sectional view thereof, and FIG. 1 (c) is concrete. FIG. 1D is a perspective view of the upper part of the made cask body, and FIG. 1D is a perspective view of the concrete shielding lid.
In FIG. 1, 21 is a concrete cask main body, 22 is a disk-shaped shielding lid, and is composed of a steel plate cylindrical portion 23 filled with concrete and a steel plate lid plate 24 on the upper surface thereof. . The shielding lid 22 is fixed to the cask main body 21 with a bolt or the like (not shown). Reference numeral 25 denotes a metal canister, and 26 denotes a cooling flow path for cooling air formed between the outer wall surface of the metal canister 25 and the inner wall surface of the cask main body 21.

２７は遮蔽蓋２２に複数箇所（例えば４箇所）設けられた方形の冷却済空気の排気孔、２８は排気孔２７に設けられた複数の棒状の遮蔽材であり、排気孔２７に水平かつ平行であって、当該排気孔２７の上下方向から見通すことができないように、例えば千鳥配列に設けられている。２９は遮蔽蓋２２を支持するキャスク本体２１の支持部である。３０は遮蔽蓋２２をキャスク本体２１に固定するボルトであり、遮蔽蓋２２の鋼板２４の取付孔３１を介してキャスク本体２１のねじ孔３２にねじ込まれて固定される。３３は遮蔽蓋２２をキャスク本体２１に着脱する際に、例えばクレーン等により吊上げる時に使用されるアイプレートである。３４はキャスク本体２１の下部に設けられた吸気口，３５はキャニスタ２５を支持する支持台である。   Reference numeral 27 denotes a rectangular cooled air exhaust hole provided at a plurality of locations (for example, four locations) on the shielding lid 22, and 28 denotes a plurality of rod-shaped shielding materials provided at the exhaust aperture 27, which are horizontal and parallel to the exhaust aperture 27. Thus, for example, the exhaust holes 27 are provided in a staggered arrangement so that they cannot be seen from above and below. Reference numeral 29 denotes a support portion of the cask main body 21 that supports the shielding lid 22. Reference numeral 30 denotes a bolt for fixing the shielding lid 22 to the cask main body 21. The bolt 30 is screwed into the screw hole 32 of the cask main body 21 via the mounting hole 31 of the steel plate 24 of the shielding lid 22 and fixed. Reference numeral 33 denotes an eye plate that is used when the shielding lid 22 is attached to and detached from the cask main body 21, for example, when it is lifted by a crane or the like. Reference numeral 34 denotes an air inlet provided in the lower part of the cask main body 21, and reference numeral 35 denotes a support base for supporting the canister 25.

このように構成されているので、キャスク本体２１の下部の吸気口３４から自然対流により吸気された冷却用空気は、冷却流路２６でキャニスタ２５の内部の崩壊熱によって熱せられて排気されるが、排気孔２７は冷却流路２６の直上に鉛直方向に設けられているため、自然対流が阻害されることなく効率的に排気されることになる。なお、排気孔２７には前述したように複数の棒状の遮蔽材２８が設けられているため、使用済燃料から出る放射線は、遮蔽材２８で十分に遮蔽される。
なお、排気孔２７に設置される棒状の遮蔽材２８の配置は、図１の実施例においてはキャスク本体２１の中心部から外側に向かって平行に設けられているが、円周方向に平行に設けるようにしてもよい。 Since it is configured in this manner, the cooling air sucked by natural convection from the lower air inlet 34 of the cask body 21 is heated by the decay heat inside the canister 25 in the cooling channel 26 and exhausted. Since the exhaust hole 27 is provided in the vertical direction directly above the cooling flow path 26, natural convection is efficiently prevented without being disturbed. Since the exhaust hole 27 is provided with the plurality of rod-shaped shielding materials 28 as described above, the radiation emitted from the spent fuel is sufficiently shielded by the shielding material 28.
The arrangement of the rod-shaped shielding members 28 installed in the exhaust holes 27 is provided in parallel from the center of the cask main body 21 to the outside in the embodiment of FIG. 1, but in parallel to the circumferential direction. You may make it provide.

棒状の遮蔽材２８の断面形状は、冷却用空気の流れをよくする（空気抵抗を少なくする）うえから、円形，流線形，半円を直線で結んだようなレーストラック形状などが適している。また、この遮蔽材２８の材質は、放射線（γ線，中性子線）を遮蔽する必要があるため、γ線遮蔽用としての鉄，ステンレスなどの鋼材や鋼材と鉛の組合せなどと、中性子線遮蔽用としてのポリエチレンなどの高分子材料とを適宜組合せて使用する。   The cross-sectional shape of the rod-shaped shielding material 28 is suitable for improving the flow of cooling air (reducing air resistance), and also for a race track shape in which a circular shape, a streamline shape, or a semicircle is connected by a straight line. . Further, since the material of the shielding material 28 needs to shield radiation (γ rays and neutron rays), steel materials such as iron and stainless steel for shielding γ rays, a combination of steel materials and lead, etc., and neutron radiation shielding. A suitable polymer material such as polyethylene is used in combination.

〔実施例２〕
図２は、本発明の第２の実施例を示すものであり、図１に示した第１の実施例における複数の棒状の遮蔽材２８を排気孔２７に着脱自在に設置できるようにしたものである。
図２（ａ）はコンクリートキャスク４０の上面図、図２（ｂ）はコンクリートキャスク４０の上部の側面断面図、図２（ｃ）は遮蔽蓋に装着される遮蔽材ブロックである。図２において、４１は円盤状の遮蔽蓋であり、内部にコンクリートが充填された鋼板製の円筒部４２と、その上面の鋼板４３からなり、この鋼板部分で図示していないボルト等によりキャスク本体２１に固定されている。この遮蔽蓋４１の複数（例えば４箇所）の排気孔４４に着脱自在に設けられる遮蔽材ブロック４５は、図２（ｃ）に示すようにＬ字状の鋼板からなる２個の支持部材４６，４６に、複数の棒状の遮蔽材４７が水平にかつ平行であって、排気孔４４の上下方向から見通すことができないように、例えば千鳥配列に設けられているものである。 [Example 2]
FIG. 2 shows a second embodiment of the present invention, in which a plurality of rod-shaped shielding materials 28 in the first embodiment shown in FIG. It is.
2A is a top view of the concrete cask 40, FIG. 2B is a side sectional view of the upper portion of the concrete cask 40, and FIG. 2C is a shielding material block attached to the shielding lid. In FIG. 2, reference numeral 41 denotes a disc-shaped shielding lid, which is composed of a steel plate cylindrical portion 42 filled with concrete and a steel plate 43 on the upper surface thereof. 21 is fixed. A shielding material block 45 detachably provided in a plurality of (for example, four) exhaust holes 44 of the shielding lid 41 includes two support members 46 made of L-shaped steel plates, as shown in FIG. 46, a plurality of rod-shaped shielding members 47 are provided horizontally, for example, in a staggered arrangement so that they cannot be seen from the vertical direction of the exhaust holes 44.

なお、前述の遮蔽蓋４１が装着されるキャスク本体２１は、図１に示した構成と同じであるため、同一の記号を付し、その説明を省略する。
遮蔽蓋４１の排気孔４４は通し孔となっており、この排気孔４４に遮蔽材ブロック４５を上方から挿入し、図示していないボルト等により遮蔽蓋４１に固定できるようになっている。従って、コンクリートキャスク４０の内部の状況をテレビカメラで観察する場合は、排気孔４４から遮蔽材ブロック４５を外して通し孔になった排気孔４４からテレビカメラ等を挿入して内部の状態を観察することが可能となる。
なお、遮蔽材ブロック４５の支持部材４６を、断面形状がコの字状又はロの字状の鋼板による枠体に形成して、この枠体に棒状の遮蔽材４７を固定するようにしてもよい。また、遮蔽材４７の設置方向は、図２に示すように円周を横切る方向に平行に設置してもよいし、円周方向に平行に設置してもよい。 Since the cask main body 21 to which the above-described shielding lid 41 is attached has the same configuration as that shown in FIG. 1, the same symbols are attached and the description thereof is omitted.
The exhaust hole 44 of the shielding lid 41 is a through hole, and a shielding material block 45 is inserted into the exhaust hole 44 from above, and can be fixed to the shielding lid 41 with a bolt or the like (not shown). Therefore, when observing the inside of the concrete cask 40 with a television camera, the shielding material block 45 is removed from the exhaust hole 44 and a television camera or the like is inserted through the exhaust hole 44 formed as a through hole to observe the internal state. It becomes possible to do.
The support member 46 of the shielding material block 45 is formed in a frame made of a steel plate having a U-shaped or B-shaped cross section, and the rod-shaped shielding material 47 is fixed to the frame. Good. Moreover, the installation direction of the shielding material 47 may be installed in parallel to the direction crossing the circumference as shown in FIG. 2, or may be installed in parallel to the circumferential direction.

〔実施例３〕
図３は、本発明の第３の実施例を示すものであり、図３（ａ）はコンクリートキャスク５０の上面図，図３（ｂ）はその側面縦断面図，図３（ｃ）はコンクリート製のキャスク本体上部の斜視図，図３（ｄ）はコンクリート製の遮蔽蓋の斜視図であり、コンクリート製の蓋本体とその上面に固定される鋼板を分離した状態を示すものである。
図３において、５１はコンクリート製のキャスク本体，５２は円盤状の遮蔽蓋であり、内部にコンクリートが充填された鋼板製の円筒部５３の上面に鋼板５４が溶接等により固定されるものである。５５は金属製のキャニスタ，５６は金属製キャニスタ５５の外壁面とキャスク本体５１の内壁面との間に形成された冷却用空気の冷却流路である。５７は遮蔽蓋５２の周縁の４箇所に凹部として設けられた冷却済空気の排気用の排気溝であり、断面形状はコの字に形成されている。 Example 3
FIG. 3 shows a third embodiment of the present invention. FIG. 3 (a) is a top view of the concrete cask 50, FIG. 3 (b) is a side longitudinal sectional view thereof, and FIG. 3 (c) is concrete. FIG. 3D is a perspective view of a concrete cask main body, and FIG. 3D is a perspective view showing a concrete lid main body and a steel plate fixed to the upper surface thereof.
In FIG. 3, 51 is a concrete cask body, 52 is a disk-shaped shielding lid, and a steel plate 54 is fixed to the upper surface of a cylindrical portion 53 made of steel plate filled with concrete by welding or the like. . 55 is a metal canister, and 56 is a cooling flow path for cooling air formed between the outer wall surface of the metal canister 55 and the inner wall surface of the cask main body 51. Reference numeral 57 denotes an exhaust groove for exhausting cooled air provided as recesses at four locations on the periphery of the shielding lid 52, and the cross-sectional shape is formed in a U shape.

５８は排気溝５７に設けられた複数の棒状の遮蔽材であり、排気溝５７に水平かつ平行であって、当該排気溝５７の上下方向から見通すことができないように、例えば千鳥配列に設けられているものである。５９は遮蔽蓋５２をキャスク本体５１に固定するボルトであり、遮蔽蓋５２の鋼板５４の取付孔６０を介してキャスク本体５１のねじ孔６１にねじ込まれて固定される。前述の遮蔽蓋５２の周縁に設けられた排気溝５７の溝底部は円弧状ではなく、平らに（直線状に）して固定作業が容易に行えるようにしてある。６２は遮蔽蓋５２をキャスク本体５１に着脱する際に、例えばクレーン等により吊上げる時に使用されるアイプレートである。
なお、キャスク本体５１の下部には、金属製のキャニスタ５５を支持する支持台６３と、冷却用空気を自然対流により吸入する吸気口６４が複数箇所（４箇所）に設けられている。 Reference numeral 58 denotes a plurality of rod-shaped shielding members provided in the exhaust groove 57, which are horizontal and parallel to the exhaust groove 57, and are provided in, for example, a staggered arrangement so that they cannot be seen from above and below the exhaust groove 57. It is what. A bolt 59 fixes the shielding lid 52 to the cask main body 51 and is screwed into the screw hole 61 of the cask main body 51 through the mounting hole 60 of the steel plate 54 of the shielding lid 52 and fixed. The groove bottom portion of the exhaust groove 57 provided on the peripheral edge of the shielding lid 52 is not arcuate, but flat (straight) so that the fixing work can be easily performed. Reference numeral 62 denotes an eye plate used when the shielding lid 52 is attached to and detached from the cask main body 51, for example, when it is lifted by a crane or the like.
In the lower part of the cask main body 51, a support base 63 for supporting the metal canister 55 and an intake port 64 for sucking cooling air by natural convection are provided at a plurality of locations (four locations).

〔実施例４〕
第４の実施例は、図３に示した第３の実施例において、遮蔽蓋５２の周縁の４箇所に形成された排気溝５７に設置される遮蔽材５８を、着脱自在に設けることができる遮蔽材ブロックを示すものである。この遮蔽材ブロック６５は、図４に示すように、一辺が円弧状に形成されている略方形の鋼板による枠体６６に、複数の棒状の遮蔽材６７を排気溝５７に水平かつ平行であって当該排気溝５７の上下方向で見通すことができないように、例えば千鳥配列に配置されるものである。
なお、図４に示した遮蔽材ブロック６５は、断面形状が略方形（ロの字状）の枠体としてあるが、コの字状の枠体としてもよい。
また、コンクリート製の蓋本体５３が挿入されるキャスク本体５１の内周面のうち、蓋本体５３に設けられる排気溝５７に対応する部分を直線状態に形成することにより、排気溝５７に装着する枠体を方形に形成させて、遮蔽材６７の装着を容易に行えるようにすることもできる。 Example 4
In the fourth embodiment, in the third embodiment shown in FIG. 3, the shielding member 58 installed in the exhaust groove 57 formed at four positions on the peripheral edge of the shielding lid 52 can be detachably provided. It shows a shielding material block. As shown in FIG. 4, the shielding material block 65 has a frame body 66 made of a substantially rectangular steel plate having an arc shape on one side, and a plurality of rod-like shielding materials 67 horizontally and parallel to the exhaust groove 57. For example, the exhaust grooves 57 are arranged in a staggered pattern so that they cannot be seen in the vertical direction.
In addition, although the shielding material block 65 shown in FIG. 4 is a frame having a substantially square (B-shaped) cross section, it may be a U-shaped frame.
Further, a portion of the inner peripheral surface of the cask main body 51 into which the concrete lid main body 53 is inserted corresponding to the exhaust groove 57 provided in the lid main body 53 is formed in a straight line, thereby being attached to the exhaust groove 57. It is also possible to form the frame body in a rectangular shape so that the shielding material 67 can be easily attached.

なお、図１及び図３の実施例では、コンクリート製の蓋本体２３又は５３に遮蔽材２８又は５８を直接装着するように示してあるが、例えば図２又は図４に示すように、コの字状又はロの字状等の鋼板による枠体に遮蔽材２８又は５８を装着して、遮蔽材ブロック４５又は６５として構成してから蓋本体２３又は５３に装着固定するようにしてもよい。   In the embodiment shown in FIGS. 1 and 3, the shielding member 28 or 58 is directly attached to the concrete lid body 23 or 53. For example, as shown in FIG. The shielding material 28 or 58 may be attached to a frame made of a steel plate such as a letter shape or a square shape, and may be configured as the shielding material block 45 or 65 before being attached and fixed to the lid body 23 or 53.

本発明によるコンクリート製貯蔵設備の遮蔽蓋は、核燃料サイクル資源としての使用済核燃料を再処理するまでの貯蔵用の設備等に適用できるものである。   The shielding cover of the concrete storage facility according to the present invention can be applied to storage facilities until reprocessing of spent nuclear fuel as a nuclear fuel cycle resource.

本発明の第１の実施例を示すコンクリートキャスクの上面図，側面縦断面図，斜視図などである。1 is a top view, a side longitudinal sectional view, and a perspective view of a concrete cask showing a first embodiment of the present invention. FIG. 本発明の第２の実施例を示すコンクリートキャスクの上面図，側面の一部縦断面図，斜視図などである。It is the top view of the concrete cask which shows the 2nd Example of this invention, the partial longitudinal cross-sectional view of a side surface, a perspective view. 本発明の第３の実施例を示すコンクリートキャスクの上面図，側面縦断面図，斜視図などである。It is the upper side figure of the concrete cask which shows the 3rd Example of this invention, a side surface longitudinal cross-sectional view, a perspective view. 本発明の第４の実施例を示すもので、遮蔽蓋に装着される遮蔽材ブロックの斜視図である。FIG. 7 is a perspective view of a shielding material block mounted on a shielding lid, showing a fourth embodiment of the present invention. 従来のコンクリートキャスクの上面図と側面縦断面図である。It is the upper side figure and side surface longitudinal cross-sectional view of the conventional concrete cask. 従来のコンクリートキャスクの一部切欠の斜視図である。It is a perspective view of the partial notch of the conventional concrete cask.

符号の説明Explanation of symbols

１，２０，４０，５０ コンクリートキャスク
２，２１，５１ コンクリート製のキャスク本体
３，３５，６３ 支持台
４，２２，４１，５２ 遮蔽蓋
５，２３，４２，５３ 内部にコンクリートが充填された鋼板製の円筒部
６，２４，４３，５４ 円盤状の鋼板
７，１２，３０，５９ ボルト
８ 炭素鋼製のライナ
９，３４，６４ 吸気口
１０， 排気口
１１，２６，５６ 冷却用空気の冷却流路
１３，３３，６２ アイプレート
１４，２５，５５ 金属製のキャニスタ
２７，４４ 排気孔
２８，４７，５８，６７ 遮蔽材
２９ キャスク本体の遮蔽蓋の支持部
３１，６０ 鋼板の取付孔
３２，６１ キャスク本体のねじ穴
４５，６５ 遮蔽材ブロック
４６ 遮蔽材の支持部材
５７ 排気溝
６６ 遮蔽材装着用の枠体 1,20,40,50 Concrete cask 2,21,51 Concrete cask body 3,35,63 Support base 4,22,41,52 Shielding lid 5,23,42,53 Steel plate filled with concrete Made of cylindrical part 6,24,43,54 Disc-shaped steel plate 7,12,30,59 bolt 8 Carbon steel liner 9,34,64 Intake port 10, Exhaust port 11,26,56 Cooling of cooling air Flow path 13, 33, 62 Eye plate 14, 25, 55 Metal canister 27, 44 Exhaust hole 28, 47, 58, 67 Shielding material 29 Shield cover support part 31, 60 Steel plate mounting hole 32, 61 Screw hole 45, 65 of shield body 45 Shield material block 46 Shield material support member 57 Exhaust groove 66 Frame for attaching shield material

Claims (4)

放射性物質を収納した円筒状の金属製キャニスタを貯蔵するための円筒状の貯蔵部を有し、該貯蔵部の下部吸気口から冷却用空気を自然対流により吸入し、該貯蔵部に収容される前記金属製キャニスタの周囲の冷却流路を経由して、上部排気口から外部に冷却済空気を排気せしめる構造のコンクリート製貯蔵設備の遮蔽蓋において、
前記金属製キャニスタの周囲の冷却流路の直上から鉛直方向に前記冷却済空気を排気する排気孔を複数箇所に設けると共に、該複数箇所の排気孔にそれぞれ棒状の遮蔽材を該排気孔の開口方向で見通すことができないように複数本配置して構成したコンクリート製貯蔵設備の遮蔽蓋。 It has a cylindrical storage part for storing a cylindrical metal canister containing a radioactive substance, the cooling air is sucked from the lower intake port of the storage part by natural convection, and is stored in the storage part In a shielding lid of a concrete storage facility having a structure in which cooled air is exhausted from an upper exhaust port to the outside via a cooling channel around the metal canister,
Exhaust holes for exhausting the cooled air in a vertical direction from directly above the cooling flow path around the metal canister are provided at a plurality of locations, and bar-shaped shielding materials are respectively provided in the exhaust holes at the plurality of locations. Shielding lid for concrete storage equipment that is arranged in multiple numbers so that it cannot be seen in the direction. 放射性物質を収納した円筒状の金属製キャニスタを貯蔵するための円筒状の貯蔵部を有し、該貯蔵部の下部吸気口から冷却用空気を自然対流により吸入し、該貯蔵部に収容される前記金属製キャニスタの周囲の冷却流路を経由して、上部排気口から外部に冷却済空気を排気せしめる構造のコンクリート製貯蔵設備の遮蔽蓋において、
前記金属製キャニスタの周囲の冷却流路の直径と同程度の直径を有する円盤状であって、該円盤の周縁部の複数箇所に厚さ方向に排気溝を設け、該各排気溝にそれぞれ棒状の遮蔽材を該排気溝の上下方向で見通すことができないように複数本配置して構成したコンクリート製貯蔵設備の遮蔽蓋。 It has a cylindrical storage part for storing a cylindrical metal canister containing a radioactive substance, the cooling air is sucked from the lower intake port of the storage part by natural convection, and is stored in the storage part In a shielding lid of a concrete storage facility having a structure in which cooled air is exhausted from an upper exhaust port to the outside via a cooling channel around the metal canister,
A disk shape having a diameter approximately equal to the diameter of the cooling flow path around the metal canister, wherein exhaust grooves are provided in a thickness direction at a plurality of peripheral portions of the disk, and each exhaust groove has a rod shape. A shielding cover for a concrete storage facility in which a plurality of the shielding materials are arranged so that they cannot be seen in the vertical direction of the exhaust groove. 前記排気孔又は排気溝にそれぞれ配置される棒状の前記遮蔽材は、該排気孔又は排気溝に着脱自在に嵌め込まれる支持部材に支持されて設けられたものである請求項１又は２に記載のコンクリート製貯蔵設備の遮蔽蓋。   The rod-shaped shielding material respectively disposed in the exhaust hole or the exhaust groove is provided by being supported by a support member that is detachably fitted in the exhaust hole or the exhaust groove. Shield cover for concrete storage equipment. 前記遮蔽蓋は、円筒状に形成された鋼板製の枠体にコンクリートが充填され、該コンクリートの上面に固定された円盤状の鋼板により構成された請求項１，２又は３に記載のコンクリート製貯蔵設備の遮蔽蓋。   4. The concrete cover according to claim 1, 2 or 3, wherein the shielding lid is composed of a disk-shaped steel plate fixed to the upper surface of the concrete, in which a steel plate frame formed in a cylindrical shape is filled with concrete. Shielding lid for storage equipment.
JP2004236946A 2004-08-17 2004-08-17 Shield cover for concrete storage equipment Expired - Fee Related JP4366493B2 (en)

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US20170125132A1 (en) * 2015-10-30 2017-05-04 Central Research Institute Of Electric Power Industry Cooling Air Amount Adjustment Device of Concrete Cask and Concrete Cask
JP2021001860A (en) * 2019-06-18 2021-01-07 三菱重工業株式会社 Storage container and method for designing storage container
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Cited By (5)

* Cited by examiner, † Cited by third party
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US20170125132A1 (en) * 2015-10-30 2017-05-04 Central Research Institute Of Electric Power Industry Cooling Air Amount Adjustment Device of Concrete Cask and Concrete Cask
US11081246B2 (en) * 2015-10-30 2021-08-03 Central Research Institute Of Electric Power Industry Cooling air amount adjustment device of concrete cask and concrete cask
JP7427033B2 (en) 2019-05-23 2024-02-02 ウェスティングハウス エレクトリック カンパニー エルエルシー Passive venting equipment for stoichiometric hydrogen and oxygen gases produced in shielded containers
JP2021001860A (en) * 2019-06-18 2021-01-07 三菱重工業株式会社 Storage container and method for designing storage container
JP7285182B2 (en) 2019-06-18 2023-06-01 三菱重工業株式会社 Storage container and storage container design method

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