JP2004333251A - Method and device for assembling pipe in high- pressure core water injection system - Google Patents

Method and device for assembling pipe in high- pressure core water injection system Download PDF

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Publication number
JP2004333251A
JP2004333251A JP2003128044A JP2003128044A JP2004333251A JP 2004333251 A JP2004333251 A JP 2004333251A JP 2003128044 A JP2003128044 A JP 2003128044A JP 2003128044 A JP2003128044 A JP 2003128044A JP 2004333251 A JP2004333251 A JP 2004333251A
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Japan
Prior art keywords
pipe
pressure vessel
pressure
connection pipe
sleeve
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JP2003128044A
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Japanese (ja)
Inventor
Minoru Hashinokuchi
稔 橋之口
Hiromasa Tada
浩正 多田
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Toshiba Corp
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Toshiba Corp
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00Energy generation of nuclear origin
    • Y02E30/30Nuclear fission reactors

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Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and a device for assembling pipes in a high-pressure core water injection system which have good workability and make it possible to obtain high precision in assembling. <P>SOLUTION: This invention relates to the method for assembling the pipes in the high-pressure core water injection system where the device is equipped with a pipe 7 on the side of a pressure vessel 43 connected to a pressure vessel nozzle 44 placed in the pressure vessel 43 of a reactor , a connection pipe 3 connected to the pipe 7 on the side of the pressure vessel 43 via a sleeve 6, a 90° elbow 2 connected to the connection pipe 3 and a pipe 1 on the side of a high-pressure core water injection sparger 42 connected to a point between the 90° elbow 2 and the sparger 42 placed in a top guide 50 and the connection pipe 3 is fixed onto the top guide 50 via a supporting member 4. In the method for assembling them, the connection pipe 3 is fixed onto the top guide 50 via the supporting member 4 after the pipe 7 on the side of the pressure vessel 43, the sleeve 6, the connection pipe 3, the 90° elbow 2 and the pipe 1 on the side of the high-pressure core water injection sparger 42 are connected in a prescribed condition. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【0001】
本発明は、沸騰水型原子炉の圧力容器ノズルから高圧炉心注水スパージャまでの流路を形成する高圧炉心注水系配管の組立方法および組立装置に関する。
【0002】
【従来の技術】
沸騰水型原子炉においては、図14に示すように、圧力容器43の内部に燃料集合体49と気水分離器51と蒸気乾燥器52が設けられており、圧力容器43の底部からリアクターインターナルポンプ47が挿入されている。燃料集合体49はシュラウド46と炉心支持体48と上部格子板50に囲まれている。そして圧力容器43内の圧力が高圧のときおよび低圧のときに冷却水を注入する機能、ならびに燃料集合体49に直接冷却水をスプレーする機能を兼ね備えた高圧炉心スプレー系(HPCS)が設けられている(下記非特許文献1参照)。
【0003】
高圧炉心スプレー系は、圧力容器43に設けられた圧力容器ノズル44と上部格子板50の内壁に配置された高圧炉心注水スパージャ42の間に接続された高圧炉心注水系配管41を備えている。この高圧炉心注水系配管41は、図15(a)の平面図および図15(b)の正面図に示すように、圧力容器ノズル44側でサーマルスリーブ45、パイプ(圧力容器側配管)7で溶接され、上部格子板50側でパイプ(高圧炉心注水スパージャ側配管)1、90°エルボ2、パイプ(接続配管)3でそれぞれ溶接され、パイプ3は上部格子板50にブレース(支持部材)4により溶接固定されている。
【0004】
図16(a)の側面図に示すように、パイプ7とパイプ3は、スリーブ6との間にカラー5により機械的に固定されている。また、図16(b)および図16(c)に示すように、スリーブ6とカラー5の隙間にはスリーブ6の外周の溝にシールリング8が組み込まれている。
【0005】
次に、この高圧炉心注水系配管41の組立方法を図17から図18により説明すると、まずパイプ7を圧力容器ノズル44に溶接し、パイプ1を上部格子板50に溶接する。そして、一体化されたパイプ3とブレース4を90°エルボ2と共に、パイプ1とパイプ7の軸心に位置合わせする。その後、パイプ3およびブレース4端部に設けた調整代9のパイプ切断長さ54、ブレース切断長さ55、およびパイプ3と90°エルボ2の溶接開先に隙間が生じないよう90°エルボ2とパイプ3の面調整するための隙間14を計測する。
【0006】
その後、パイプ切断長さ54およびブレース切断長さ55を切断し、溶接するための開先を加工する。そしてパイプ1とパイプ7の軸心に位置合わせした後、パイプ1と90°エルボ2を溶接する。次に、90°エルボ2とパイプ7の軸心に位置合わせした後、パイプ3と90°エルボ2、およびブレース4と上部格子板50を溶接する。
【0007】
最後に、図16に示したように、シールリング8およびカラー5を取り付けたスリーブ6をパイプ7とパイプ3の間に組み込み、パイプ7およびパイプ3をスリーブ6を介して機械的に結合する。
【0008】
【非特許文献1】
新版原子力ハンドブック(1989年オーム社発行)第III編第6章
【0009】
【発明が解決しようとする課題】
しかしながら、上述した従来の高圧炉心注水系配管の組立方法では、パイプ3にブレース4を取り付けた形でパイプ切断長さ54の計測および調整代切断ならびに開先加工した後にパイプAおよび90°エルボ2を取り付ける場合、ブレース4が取り付けられているためパイプ3のバランスが悪く、パイプAおよび90°エルボ2に対し所定の位置に設置できない。そのためパイプ切断長さ54に誤差が生じて配管の接続位置がずれる惧れがある。また、バランスの悪いパイプ3を上部格子板50と圧力容器43の狭いスペースで保持しなければならないため安全上の配慮が必要である。
【0010】
また、パイプ3とブレース4の溶接を90°エルボ2とパイプ3の溶接後に行う場合は、ブレース4とパイプ3の溶接によりパイプ3が変形してパイプ7との芯位置がずれ、端面間の距離が規定値を満足できなくなり、ひいてはスリーブ6が組み込めなくなる。
【0011】
さらに、スリーブ6をパイプ7とパイプ3の間に組み込む場合、カラー5をパイプ7とパイプ3に締付ける際、シールリング8がスリーブ6の溝から脱落しカラー5のネジ部に嵌合して、所定の位置にシールリングが装着できない惧れがある。
【0012】
本発明はこのような課題を解決するためになされたものであり、作業性がよく、高い組立精度を得ることのできる高圧炉心注水系配管の組立方法および組立装置を提供することを目的とする。
【0013】
【課題を解決するための手段】
上記目的を達成するために請求項1の発明の高圧炉心注水系配管の組立方法は、原子炉の圧力容器に設けられた圧力容器ノズルに接続された圧力容器側配管と、この圧力容器側配管にスリーブを介して接続された接続配管と、この接続配管に接続された90°エルボと、この90°エルボと原子炉の上部格子板に設けられた高圧炉心注水スパージャとの間に接続された高圧炉心注水スパージャ側配管とを備え、前記接続配管は支持部材を介して前記上部格子板に固定されてなる高圧炉心注水系配管の組立方法において、前記圧力容器側配管と前記スリーブと前記接続配管と前記90°エルボと前記高圧炉心注水スパージャ側配管を所定の状態に接続したのちに前記接続配管を前記支持部材を介して前記上部格子板に固定する構成とする。
【0014】
請求項2の発明は、前記圧力容器側配管と前記接続配管を接続する際、原子炉の圧力容器と上部格子板の間に挿入された保持装置によって前記接続配管を保持し位置決めする構成とする。
【0015】
請求項3の発明は、前記圧力容器側配管の端部に取り付けたパイプ芯出し治具と前記接続配管の端部に取り付けた配管長さ計測治具によって前記接続配管の切断長さを計測し、前記接続配管に取り付けたブレース長さ計測治具によって前記支持部材の切断長さを計測する構成とする。
【0016】
請求項4の発明は、前記90°エルボと前記接続配管の接続は、前記接続配管と前記支持部材の溶接による溶接変形量を見込んで行う構成とする。
請求項5の発明は、前記圧力容器側配管または前記接続配管と前記スリーブとの接続は、前記スリーブと前記スリーブの端に結合されるカラーの間に挿入されるシールリング押え治具によって前記スリーブの外周面に形成された溝に設けられたシールリングを押えて脱落を防止しながら行う構成とする。
【0017】
請求項6の発明は、原子炉の圧力容器に設けられた圧力容器ノズルに接続された圧力容器側配管と、この圧力容器側配管にスリーブを介して接続された接続配管と、この接続配管に接続された90°エルボと、この90°エルボと原子炉の上部格子板に設けられた高圧炉心注水スパージャとの間に接続された高圧炉心注水スパージャ側配管とを備え、前記接続配管は支持部材を介して前記上部格子板に固定されてなる高圧炉心注水系配管の組立装置において、前記圧力容器側配管と前記接続配管を接続する際、原子炉の圧力容器と上部格子板の間に挿入され前記接続配管を保持する保持装置を備えた構成とする。
【0018】
請求項7の発明は、前記圧力容器側配管の端部および前記接続配管の端部に取り付けられて前記接続配管の切断長さを計測するパイプ芯出し治具および配管長さ計測治具を備えた構成とする。
【0019】
請求項8の発明は、前記接続配管に取り付けられて前記支持部材の切断長さを計測するブレース長さ計測治具を備えた構成とする。
請求項9の発明は、前記圧力容器側配管または前記接続配管と前記スリーブとを接続するときに前記スリーブと前記スリーブの端に結合されるカラーの間に挿入され前記スリーブの外周面に形成された溝に設けられたシールリングを押えて脱落を防止するシールリング押え治具を備えた構成とする。
【0020】
【発明の実施の形態】
以下、本発明の実施の形態について図面を参照して説明する。
図1は本発明の第1の実施の形態を説明する図である。この実施の形態では、パイプ(接続配管)3にブレース(支持部材)4を取り付けない状態でのパイプ3およびブレース4の切断長さを計測した後、調整代を切断し開先加工する(図17,18参照)。開先加工したパイプ3と90°エルボ2の軸心をパイプ7の軸心に合わせて溶接する。さらに、上部格子板50とパイプ3の間に調整代を切断し開先加工したブレース4を溶接する。
【0021】
この実施の形態の高圧炉心注水系配管の組立方法においては、圧力容器ノズル44から高圧炉心注水スパージャ42までの流路を形成する高圧炉心注水系配管において、パイプ3と90°エルボ2を接続した後にブレース4を溶接することで、パイプ3の切断長さ及びブレース4の切断長さを精度よく計測することができるとともに、配管長さ調整後の接続を容易、且つ、安全に行うことができる。
【0022】
つぎに図2および図3を参照して本発明の第2の実施の形態を説明する。この実施の形態では、圧力容器43と上部格子板50の間に配管保持装置11を設置し、配管保持装置11のベース10上に配置された配管保持治具12により90°エルボ2を保持し、配管保持治具13でパイプ3を保持する。パイプ3および90°エルボ2を保持した状態でパイプ7の軸心とパイプ3および90°エルボ2の軸心が一致するように配管保持治具12および配管保持治具13で調整して配管を接続する。また、パイプ7とパイプ3の端面間の距離についても配管保持治具12および13により高さ方向の調整を行う。
【0023】
この実施の形態においては、ベース10上に配置された配管保持治具12,13により空間にある90°エルボ2及びパイプ3の軸方向及び水平方向の位置合わせを行うことができる。
【0024】
つぎに図4から図7を参照して本発明の第3の実施の形態を説明する。この実施の形態では、90°エルボ2を配管支持治具12および配管保持治具13で保持し、パイプ3を90°エルボ2およびパイプ7の軸心に合わせて固定する。次に、パイプ7にパイプ芯出し治具17および下げ振り18を取り付ける。さらに、パイプ3に配管長さ計測治具16を取り付けて、パイプ7とパイプ3の芯ずれ量15およびパイプ3と90°エルボ2の隙間14を計測する。このようにしてパイプ3の切断長さを計測する。また、パイプ3に取り付けたブレース長さ計測治具34と上部格子板50の間の隙間を計測することでブレース4の切断長さを計測する。
【0025】
パイプ7とパイプ3の芯ずれ量15の計測の詳細を図6および図8を参照して説明する。すなわち、パイプ7の軸心より降ろした下げ振り18を予め配管長さ計測治具16の長穴32に通しておく。次に、パイプ3の配管端に配管長さ計測治具16を取り付け、パイプ3の軸心に基準面31を合わせ、固定ボルト35により固定し、下げ振り18と軸芯33の芯ずれ量15を計測する。このようにしてパイプ3の切断長さを計測することができる。
【0026】
また、ブレース4の切断長さ計測の詳細は次のように行う。すなわち、図7および図9に示すように、ブレース4の形状を模擬したブレース長さ計測治具34をパイプ3の外表面に取り付け、固定ボルト35で固定して、上部格子板50の外表面からブレース長さ計測治具34の基準線36までの寸法を数ヶ所計測する。このようにしてブレース切断長さを計測することができる。
【0027】
この実施の形態によれば、パイプ7の軸心を基準にしてパイプ3の軸心の位置を正確に決めることができるとともにパイプ3の切断長さを容易に計測することができる。また、計測治具34をパイプ3の外表面に取り付けてパイプ3と上部格子板50の距離を計測し、ブレース4の取り付け位置における切断長さを計測することができる。
【0028】
つぎに図10を参照して本発明の第4の実施の形態を説明する。パイプ3とブレース4の溶接によりパイプ7とパイプ3の端面間距離20が端面間距離21に対し1.5〜3.0mm短くなるため、この実施の形態では、端面間距離20が端面間距離21より1.5mm〜3.0mm長くなるように予めパイプ3と90°エルボ2を溶接しておく。次に、ブレース4をパイプ3と溶接することによってパイプB3が溶接により変位するので端面間距離20と端面間距離21を等しくすることができる。
【0029】
この実施の形態においては、パイプ3にブレース4を溶接するときのパイプ3の溶接変位量を見こんでパイプ3と90°エルボ2を溶接することで、パイプ7とパイプ3の芯ずれを防止することができ、且つ、正しい端面距離を得ることができる。
【0030】
つぎに図11を参照して本発明の第5の実施の形態を説明する。この実施の形態では、パイプ3とパイプ7を接続するスリーブ6に予めシールリング8およびカラー5を取り付け、シールリング8とカラー5の間に周方向に分割可能なシールリング押さえ治具23を挿入した状態で、パイプ7およびパイプ3の間に取り付ける。その後、シールリング押さえ治具23を組み込んだ状態でカラー5をパイプ7およびパイプ3に締結し、締結後シールリング押さえ治具23を引き抜く。
【0031】
シールリング押え治具23は、リング37の周上に数ヶ所配置されたスペーサ38を有し、スペーサ38をスリーブ6およびシールリング8とカラー5の間の隙間に挿入することで、スリーブ6のシールリング溝より、シールリング8が脱落することなくカラー5をパイプ7およびパイプ3に組み込むことができる。なお、リング37はスリーブ6から分解可能とするため分割されている。
この実施の形態においては、リング37によってスリーブ6とカラー5の間の隙間を一時的に小さくすることでシールリング8の脱落を防止することができる。
【0032】
つぎに図12および図13を参照して本発明の第6の実施の形態を説明する。この実施の形態では、配管保持装置11の配管保持治具12および配管保持治具13はベース10上にフッ素樹脂シート27を介して設置され、90°エルボ2は配管保持治具12に設けられた支持台29aおよびサポート28a,28bで保持する。そして位置調整ボルト30および高さ調整ボルト25および押しボルト24により位置調整を行う。また、配管保持治具13はパイプ3を支持台29b,29cで支持し、ストッパ26に設けた固定ボルト30bでパイプ3を固定すると共に高さ調整ボルト25および押しボルト24により位置調整および固定を行う。
この実施の形態によれば90°エルボ2とパイプ3の位置調整と芯出しを容易かつ正確に行うことができる。
【0033】
以上説明したように、本発明の実施の形態の高圧炉心注水系配管の組立方法および組立装置によれば、高圧炉心注水系配管を接続するために、上流側配管であるパイプ7と下流側配管であるパイプ1を接続および固定するために、パイプ3およびブレース4に予め設けられている調整代を精度良く、且つ、容易に計測することができる。また、90°エルボ2およびパイプ3を接続する際、原子炉の圧力容器43と上部格子板50の間に設けられた足場等にベース10を設置し、このベース10上に90°エルボ2およびパイプ3を保持し、保持治具12,13により90°エルボ2およびパイプ3を位置出し固定することで作業性および安全性を向上させることができる。
【0034】
【発明の効果】
本発明によれば、作業性がよく、高い組立精度の得られる高圧炉心注水系配管の組立方法および組立装置を提供することができる。
【図面の簡単な説明】
【図1】本発明の第1の実施の形態の高圧炉心注水系配管の組立方法を示し、(a)は組立途中の平面図、(b)は組立完了時の平面図、(c)は接続配管の正面図。
【図2】本発明の第2の実施の形態の高圧炉心注水系配管の組立方法を示し、(a)は90°エルボの支持方法を示す正面図、(b)は接続配管と圧力容器側配管の接続方法を示す正面図。
【図3】本発明の第2の実施の形態の高圧炉心注水系配管の組立方法の原子炉内での実施状況を示す図。
【図4】本発明の第3の実施の形態の高圧炉心注水系配管の組立方法を示し、(a)は90°エルボの支持方法を示す正面図、(b)は接続配管と圧力容器側配管および90°エルボとの接続方法を示す正面図。
【図5】本発明の第3の実施の形態の高圧炉心注水系配管の組立方法の原子炉内での実施状況を示す図。
【図6】本発明の第3の実施の形態の高圧炉心注水系配管の組立方法において接続配管と圧力容器側配管の芯合わせの状況を示す図。
【図7】本発明の第3の実施の形態の高圧炉心注水系配管の組立方法においてブレース長さの計測状況を示す図。
【図8】本発明の第3の実施の形態の高圧炉心注水系配管の組立方法において使用する配管長さ計測治具を示し、(a)は平面図、(b)は縦断面図。
【図9】本発明の第3の実施の形態の高圧炉心注水系配管の組立方法において使用するブレース長さ計測治具を示し、(a)は側面図、(b)は正面図。
【図10】本発明の第4の実施の形態の高圧炉心注水系配管の組立方法を示す正面図。
【図11】本発明の第5の実施の形態の高圧炉心注水系配管の組立方法による接続配管と圧力容器側配管の接続状況を示し、(a)は要部断面図、(b)はシールリング押え治具の断面図。
【図12】本発明の第6の実施の形態の高圧炉心注水系配管の組立装置を示し、(a)は正面図、(b)は側面図。
【図13】本発明の第6の実施の形態の高圧炉心注水系配管の組立装置の詳細を示し、(a)および(b)は配管保持治具12の側面図および正面図、(c)および(d)は配管保持治具13のそれぞれ異なる部分を示す図。
【図14】本発明の適用される沸騰水型原子炉を示す断面図。
【図15】従来の高圧炉心注水系配管の取付け状態を示し、(a)は平面図、(b)は正面図。
【図16】従来の高圧炉心注水系配管の取付け状態を示し、(a)は側面図、(b)は(a)の要部断面図、(c)は(b)のC部拡大図。
【図17】従来の高圧炉心注水系配管における接続配管と支持部材を結合した構成を示し、(a)は正面図、(b)は平面図。
【図18】従来の高圧炉心注水系配管のパイプ切断長さの計測方法を示し、(a)は正面図、(b)は平面図。
【符号の説明】
1…パイプ(高圧炉心注水スパージャ側配管)、2…90°エルボ、3…パイプ(接続配管)、4…ブレース(支持部材)、5…カラー、6…スリーブ、7…パイプ(圧力容器側配管)、8…シールリング、9…調整代、10…ベース、11…配管保持装置、12,13…配管保持治具、14…隙間、15…芯ずれ量、16…配管長さ計測治具、17…パイプ芯出し治具、18…下げ振り、19…隙間、20,21…端面間距離、23…シールリング押え治具、24…押しボルト、25…高さ調整ボルト、26…ストッパ、27…フッ素樹脂シート、28a,28b…サポート、29a,29b,29c…支持台、30…位置調整ボルト、30b…固定ボルト、31…基準面、32…長穴、33…軸芯、34…ブレース長さ計測治具、35…固定ボルト、36…基準線、37…リング、38…スペーサ、41…高圧炉心注水系配管、42…高圧炉心注水スパージャ、43…圧力容器、44…圧力容器ノズル、45…サーマルスリーブ、46…シュラウド、47…リアクターインターナルポンプ、48…炉心支持板、49…燃料集合体、50…上部格子板、51…気水分離器、52…蒸気乾燥器、54…パイプ切断長さ、55…ブレース切断長さ。
[0001]
The present invention relates to an assembling method and an assembling apparatus for a high-pressure core injection system piping for forming a flow path from a pressure vessel nozzle of a boiling water reactor to a high-pressure core injection sparger.
[0002]
[Prior art]
In the boiling water reactor, as shown in FIG. 14, a fuel assembly 49, a steam separator 51, and a steam dryer 52 are provided inside a pressure vessel 43, and a reactor interface is provided from the bottom of the pressure vessel 43. A null pump 47 is inserted. The fuel assembly 49 is surrounded by a shroud 46, a core support 48, and an upper grid plate 50. A high-pressure core spray system (HPCS) is provided which has a function of injecting cooling water when the pressure in the pressure vessel 43 is high and low, and a function of spraying cooling water directly to the fuel assembly 49. (See Non-Patent Document 1 below).
[0003]
The high-pressure core spray system includes a high-pressure core injection pipe 41 connected between a pressure vessel nozzle 44 provided in the pressure vessel 43 and a high-pressure core injection sparger 42 disposed on the inner wall of the upper lattice plate 50. As shown in the plan view of FIG. 15 (a) and the front view of FIG. 15 (b), the high pressure core water injection system pipe 41 is connected to the thermal sleeve 45 and the pipe (pressure vessel side pipe) 7 on the pressure vessel nozzle 44 side. The upper lattice plate 50 is welded with a pipe (high pressure core injection sparger side piping) 1, a 90 ° elbow 2, and a pipe (connection piping) 3 on the upper lattice plate 50 side. Is fixed by welding.
[0004]
As shown in the side view of FIG. 16A, the pipe 7 and the pipe 3 are mechanically fixed between the sleeve 6 and the collar 5. As shown in FIGS. 16B and 16C, a seal ring 8 is incorporated in a groove on the outer periphery of the sleeve 6 in a gap between the sleeve 6 and the collar 5.
[0005]
Next, a method of assembling the high-pressure core injection pipe 41 will be described with reference to FIGS. 17 to 18. First, the pipe 7 is welded to the pressure vessel nozzle 44, and the pipe 1 is welded to the upper lattice plate 50. Then, the integrated pipe 3 and brace 4 together with the 90 ° elbow 2 are aligned with the axis of the pipes 1 and 7. Thereafter, the 90 ° elbow 2 is provided so that no gap is formed between the pipe cutting length 54 and the brace cutting length 55 of the adjustment allowance 9 provided at the ends of the pipe 3 and the brace 4 and the welding groove between the pipe 3 and the 90 ° elbow 2. The gap 14 for adjusting the surface of the pipe 3 is measured.
[0006]
Thereafter, the pipe cutting length 54 and the brace cutting length 55 are cut, and a groove for welding is processed. Then, after the pipe 1 and the pipe 7 are aligned with each other, the pipe 1 and the 90 ° elbow 2 are welded. Next, after the 90 ° elbow 2 and the pipe 7 are aligned with each other, the pipe 3 and the 90 ° elbow 2 and the brace 4 and the upper lattice plate 50 are welded.
[0007]
Finally, as shown in FIG. 16, the sleeve 6 to which the seal ring 8 and the collar 5 are attached is assembled between the pipes 7 and 3, and the pipes 7 and 3 are mechanically connected via the sleeve 6.
[0008]
[Non-patent document 1]
New Version Nuclear Handbook (issued by Ohmsha, 1989) Part III, Chapter 6 [0009]
[Problems to be solved by the invention]
However, in the above-described conventional method of assembling the high pressure core water injection pipe, the pipe A and the 90 ° elbow 2 When the brace 4 is attached, the balance of the pipe 3 is poor, and the brace 4 cannot be installed at a predetermined position with respect to the pipe A and the 90 ° elbow 2. Therefore, there is a possibility that an error occurs in the pipe cutting length 54 and the connection position of the pipe is shifted. Further, since the unbalanced pipe 3 must be held in a narrow space between the upper lattice plate 50 and the pressure vessel 43, safety considerations are required.
[0010]
When the welding of the pipe 3 and the brace 4 is performed after the welding of the 90 ° elbow 2 and the pipe 3, the welding of the brace 4 and the pipe 3 causes the pipe 3 to be deformed and the center position of the pipe 7 to be shifted, so that the end face The distance cannot satisfy the specified value, and the sleeve 6 cannot be assembled.
[0011]
Further, when the sleeve 6 is incorporated between the pipe 7 and the pipe 3, when the collar 5 is fastened to the pipe 7 and the pipe 3, the seal ring 8 falls off from the groove of the sleeve 6 and fits into the thread portion of the collar 5, There is a possibility that the seal ring cannot be mounted at a predetermined position.
[0012]
The present invention has been made to solve such a problem, and an object of the present invention is to provide an assembling method and an assembling apparatus for a high-pressure core water injection system piping which has good workability and can obtain high assembling accuracy. .
[0013]
[Means for Solving the Problems]
In order to achieve the above object, a method for assembling a high pressure reactor core injection system pipe according to the present invention includes a pressure vessel side pipe connected to a pressure vessel nozzle provided in a pressure vessel of a nuclear reactor, and a pressure vessel side pipe. A connection pipe connected to the connection pipe via a sleeve, a 90 ° elbow connected to the connection pipe, and a high-pressure core injection sparger provided on the upper lattice plate of the reactor and the 90 ° elbow. A method for assembling a high-pressure core water injection system pipe, comprising: a high-pressure core water injection sparger side pipe, wherein the connection pipe is fixed to the upper lattice plate via a support member, wherein the pressure vessel side pipe, the sleeve, and the connection pipe And the 90 ° elbow and the high pressure core injection sparger side pipe are connected in a predetermined state, and then the connection pipe is fixed to the upper lattice plate via the support member.
[0014]
The invention of claim 2 is configured such that, when connecting the pressure vessel side pipe and the connection pipe, the connection pipe is held and positioned by a holding device inserted between the pressure vessel of the reactor and the upper lattice plate.
[0015]
According to a third aspect of the present invention, the cutting length of the connection pipe is measured by a pipe centering jig attached to an end of the pressure vessel side pipe and a pipe length measuring jig attached to an end of the connection pipe. The cutting length of the support member is measured by a brace length measuring jig attached to the connection pipe.
[0016]
The invention according to a fourth aspect is configured such that the connection between the 90 ° elbow and the connection pipe is performed in consideration of a welding deformation caused by welding between the connection pipe and the support member.
The invention according to claim 5, wherein the connection between the pressure vessel side pipe or the connection pipe and the sleeve is performed by a seal ring pressing jig inserted between the sleeve and a collar coupled to an end of the sleeve. The seal ring provided in the groove formed on the outer peripheral surface is pressed to prevent the seal ring from falling off.
[0017]
The invention of claim 6 provides a pressure vessel side pipe connected to a pressure vessel nozzle provided in a pressure vessel of a nuclear reactor, a connection pipe connected to the pressure vessel side pipe via a sleeve, and a connection pipe. A 90 ° elbow connected thereto, and a high-pressure core injection sparger-side pipe connected between the 90 ° elbow and a high-pressure core injection sparger provided on the upper lattice plate of the reactor, wherein the connection pipe is a supporting member. In the apparatus for assembling a high-pressure core water injection system piping fixed to the upper lattice plate via the above, when connecting the pressure vessel side piping and the connection piping, the connection is inserted between the pressure vessel of the reactor and the upper lattice plate. A configuration is provided that includes a holding device that holds the pipe.
[0018]
The invention according to claim 7 is provided with a pipe centering jig and a pipe length measuring jig attached to an end of the pressure vessel side pipe and an end of the connection pipe to measure a cutting length of the connection pipe. Configuration.
[0019]
The invention according to claim 8 is configured to include a brace length measuring jig attached to the connection pipe and measuring a cutting length of the support member.
The invention according to claim 9 is formed on the outer peripheral surface of the sleeve by being inserted between the sleeve and a collar coupled to an end of the sleeve when the pressure vessel side pipe or the connection pipe is connected to the sleeve. And a seal ring holding jig for holding the seal ring provided in the groove to prevent the seal ring from falling off.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram for explaining a first embodiment of the present invention. In this embodiment, after measuring the cutting length of the pipe 3 and the brace 4 in a state where the brace (support member) 4 is not attached to the pipe (connection pipe) 3, the adjustment margin is cut and the groove is machined (FIG. 17, 18). The pipe 3 and the 90 ° elbow 2 on which the beveling process is performed are aligned with the axis of the pipe 7 and welded. Further, the adjustment margin is cut between the upper lattice plate 50 and the pipe 3, and the grooved brace 4 is welded.
[0021]
In the method for assembling the high-pressure core water injection system pipe of this embodiment, the pipe 3 and the 90 ° elbow 2 are connected in the high-pressure core water injection system pipe that forms a flow path from the pressure vessel nozzle 44 to the high-pressure core water injection sparger 42. By welding the brace 4 later, the cut length of the pipe 3 and the cut length of the brace 4 can be accurately measured, and the connection after adjusting the pipe length can be easily and safely performed. .
[0022]
Next, a second embodiment of the present invention will be described with reference to FIGS. In this embodiment, the pipe holding device 11 is installed between the pressure vessel 43 and the upper lattice plate 50, and the 90 ° elbow 2 is held by the pipe holding jig 12 arranged on the base 10 of the pipe holding device 11. The pipe 3 is held by the pipe holding jig 13. With the pipe 3 and the 90 ° elbow 2 held, the pipe is adjusted by adjusting the pipe holding jig 12 and the pipe holding jig 13 so that the axis of the pipe 7 matches the axis of the pipe 3 and the 90 ° elbow 2. Connecting. Also, the distance between the end faces of the pipe 7 and the pipe 3 is adjusted in the height direction by the pipe holding jigs 12 and 13.
[0023]
In this embodiment, the 90 ° elbow 2 and the pipe 3 in the space can be axially and horizontally aligned by the pipe holding jigs 12 and 13 arranged on the base 10.
[0024]
Next, a third embodiment of the present invention will be described with reference to FIGS. In this embodiment, the 90 ° elbow 2 is held by the pipe support jig 12 and the pipe holding jig 13, and the pipe 3 is fixed in accordance with the axes of the 90 ° elbow 2 and the pipe 7. Next, a pipe centering jig 17 and a plunger 18 are attached to the pipe 7. Further, a pipe length measuring jig 16 is attached to the pipe 3 to measure the misalignment 15 between the pipe 7 and the pipe 3 and the gap 14 between the pipe 3 and the 90 ° elbow 2. Thus, the cutting length of the pipe 3 is measured. Also, the cut length of the brace 4 is measured by measuring the gap between the brace length measuring jig 34 attached to the pipe 3 and the upper lattice plate 50.
[0025]
Details of the measurement of the misalignment amount 15 between the pipe 7 and the pipe 3 will be described with reference to FIGS. That is, the down swing 18 lowered from the axis of the pipe 7 is previously passed through the elongated hole 32 of the pipe length measuring jig 16. Next, the pipe length measuring jig 16 is attached to the pipe end of the pipe 3, the reference surface 31 is aligned with the axis of the pipe 3, and the pipe 3 is fixed with the fixing bolt 35. Is measured. Thus, the cutting length of the pipe 3 can be measured.
[0026]
The details of the measurement of the cutting length of the brace 4 are performed as follows. That is, as shown in FIGS. 7 and 9, a brace length measuring jig 34 simulating the shape of the brace 4 is attached to the outer surface of the pipe 3 and fixed with fixing bolts 35, and the outer surface of the upper grid plate 50 is fixed. Then, several dimensions from the reference line 36 of the brace length measuring jig 34 to the reference line 36 are measured. In this way, the brace cutting length can be measured.
[0027]
According to this embodiment, the position of the axis of the pipe 3 can be accurately determined based on the axis of the pipe 7, and the cutting length of the pipe 3 can be easily measured. Further, the measuring jig 34 is attached to the outer surface of the pipe 3 to measure the distance between the pipe 3 and the upper lattice plate 50, so that the cutting length at the position where the brace 4 is attached can be measured.
[0028]
Next, a fourth embodiment of the present invention will be described with reference to FIG. Since the distance 20 between the end faces of the pipe 7 and the pipe 3 is shorter than the distance 21 between the end faces by 1.5 to 3.0 mm by welding the pipe 3 and the brace 4, in this embodiment, the distance 20 between the end faces is the distance between the end faces. The pipe 3 and the 90 ° elbow 2 are welded in advance so as to be 1.5 mm to 3.0 mm longer than 21. Next, by welding the brace 4 to the pipe 3, the pipe B3 is displaced by welding, so that the end face distance 20 and the end face distance 21 can be made equal.
[0029]
In this embodiment, the pipe 3 and the 90 ° elbow 2 are welded in anticipation of the welding displacement of the pipe 3 when the brace 4 is welded to the pipe 3, thereby preventing the pipe 7 from being misaligned with the pipe 3. And a correct end face distance can be obtained.
[0030]
Next, a fifth embodiment of the present invention will be described with reference to FIG. In this embodiment, a seal ring 8 and a collar 5 are attached to a sleeve 6 connecting the pipe 3 and the pipe 7 in advance, and a seal ring holding jig 23 that can be divided in the circumferential direction is inserted between the seal ring 8 and the collar 5. In this state, it is attached between the pipe 7 and the pipe 3. Thereafter, the collar 5 is fastened to the pipe 7 and the pipe 3 with the seal ring holding jig 23 incorporated therein, and after the fastening, the seal ring holding jig 23 is pulled out.
[0031]
The seal ring holding jig 23 has spacers 38 arranged at several places on the circumference of the ring 37, and by inserting the spacers 38 into the sleeve 6 and the gap between the seal ring 8 and the collar 5, The collar 5 can be incorporated into the pipe 7 and the pipe 3 without the seal ring 8 falling off from the seal ring groove. The ring 37 is divided so that it can be disassembled from the sleeve 6.
In this embodiment, the gap between the sleeve 6 and the collar 5 is temporarily reduced by the ring 37 to prevent the seal ring 8 from falling off.
[0032]
Next, a sixth embodiment of the present invention will be described with reference to FIGS. In this embodiment, the pipe holding jig 12 and the pipe holding jig 13 of the pipe holding device 11 are installed on the base 10 via the fluororesin sheet 27, and the 90 ° elbow 2 is provided on the pipe holding jig 12. It is held by the support base 29a and the supports 28a and 28b. Then, the position is adjusted by the position adjusting bolt 30, the height adjusting bolt 25, and the push bolt 24. Further, the pipe holding jig 13 supports the pipe 3 with the support bases 29b and 29c, fixes the pipe 3 with the fixing bolt 30b provided on the stopper 26, and adjusts and fixes the position with the height adjustment bolt 25 and the push bolt 24. Do.
According to this embodiment, the position adjustment and centering of the 90 ° elbow 2 and the pipe 3 can be performed easily and accurately.
[0033]
As described above, according to the assembling method and the assembling apparatus of the high-pressure core water injection system piping of the embodiment of the present invention, in order to connect the high-pressure core water injection system piping, the pipe 7 as the upstream pipe and the downstream pipe are connected. In order to connect and fix the pipe 1, the adjustment allowance provided in advance to the pipe 3 and the brace 4 can be accurately and easily measured. When connecting the 90 ° elbow 2 and the pipe 3, the base 10 is placed on a scaffold or the like provided between the pressure vessel 43 of the reactor and the upper lattice plate 50, and the 90 ° elbow 2 and the pipe 10 are placed on the base 10. The workability and safety can be improved by holding the pipe 3 and positioning and fixing the 90 ° elbow 2 and the pipe 3 by the holding jigs 12 and 13.
[0034]
【The invention's effect】
According to the present invention, it is possible to provide an assembling method and an assembling apparatus for a high-pressure core water injection system pipe that have good workability and high assembling accuracy.
[Brief description of the drawings]
FIGS. 1A and 1B show a method of assembling a high-pressure core water injection pipe according to a first embodiment of the present invention, wherein FIG. 1A is a plan view during assembly, FIG. 1B is a plan view at the time of completion of assembly, and FIG. The front view of a connection piping.
2A and 2B show a method of assembling a high-pressure core water injection system pipe according to a second embodiment of the present invention, wherein FIG. 2A is a front view showing a method of supporting a 90 ° elbow, and FIG. The front view which shows the connection method of piping.
FIG. 3 is a diagram showing a state of implementation in a reactor of a method for assembling a high-pressure core water injection system pipe according to a second embodiment of the present invention.
4A and 4B show a method of assembling a high-pressure core water injection pipe according to a third embodiment of the present invention, wherein FIG. 4A is a front view showing a method of supporting a 90 ° elbow, and FIG. The front view which shows the connection method with piping and a 90 degree elbow.
FIG. 5 is a diagram showing a state of implementation in a nuclear reactor of a method of assembling a high-pressure core water injection system piping according to a third embodiment of the present invention.
FIG. 6 is a diagram showing a state of centering of a connection pipe and a pressure vessel side pipe in a method of assembling a high pressure core injection system pipe according to a third embodiment of the present invention.
FIG. 7 is a diagram showing a measurement state of a brace length in a method for assembling a high-pressure core water injection pipe according to a third embodiment of the present invention.
FIGS. 8A and 8B show a pipe length measuring jig used in the method for assembling a high pressure reactor core injection system pipe according to the third embodiment of the present invention, wherein FIG. 8A is a plan view and FIG.
FIG. 9 shows a brace length measuring jig used in the method for assembling a high-pressure core water injection system pipe according to the third embodiment of the present invention, where (a) is a side view and (b) is a front view.
FIG. 10 is a front view showing a method for assembling a high-pressure core water injection system pipe according to a fourth embodiment of the present invention.
11A and 11B show a connection state between a connection pipe and a pressure vessel side pipe according to a method for assembling a high-pressure core water injection pipe according to a fifth embodiment of the present invention, wherein FIG. Sectional drawing of a ring holding jig.
FIGS. 12A and 12B show an assembling apparatus for a high-pressure core water injection pipe according to a sixth embodiment of the present invention, wherein FIG. 12A is a front view and FIG.
FIGS. 13A and 13B show details of an assembling apparatus for a high-pressure core water injection system piping according to a sixth embodiment of the present invention, wherein FIGS. 13A and 13B are side and front views of the piping holding jig 12, and FIG. (D) is a figure which shows each different part of the piping holding jig.
FIG. 14 is a sectional view showing a boiling water reactor to which the present invention is applied.
15 (a) is a plan view, and FIG. 15 (b) is a front view, showing a mounting state of a conventional high pressure core water injection system piping.
16 (a) is a side view, FIG. 16 (b) is a cross-sectional view of a main part of FIG. 16 (a), and FIG. 16 (c) is an enlarged view of a part C of FIG. 16 (b).
17A and 17B show a configuration in which a connection pipe and a support member in a conventional high-pressure core water injection system pipe are connected, (a) is a front view, and (b) is a plan view.
FIGS. 18A and 18B show a conventional method for measuring a pipe cutting length of a high-pressure core water injection pipe, where FIG. 18A is a front view and FIG. 18B is a plan view.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Pipe (high pressure core injection sparger side piping), 2 ... 90 degree elbow, 3 ... pipe (connection piping), 4 ... brace (supporting member), 5 ... collar, 6 ... sleeve, 7 ... pipe (pressure vessel side piping) ), 8: seal ring, 9: adjustment allowance, 10: base, 11: pipe holding device, 12, 13: pipe holding jig, 14: gap, 15: misalignment, 16: pipe length measuring jig, 17: Pipe centering jig, 18: Down swing, 19: Gap, 20, 21: Distance between end faces, 23: Seal ring holding jig, 24: Push bolt, 25: Height adjusting bolt, 26: Stopper, 27 ... Fluororesin sheet, 28a, 28b ... Support, 29a, 29b, 29c ... Support base, 30 ... Position adjustment bolt, 30b ... Fixing bolt, 31 ... Reference plane, 32 ... Elongated hole, 33 ... Shaft core, 34 ... Brace length Sa measuring jig, 35 ... Constant bolt, 36 ... Reference line, 37 ... Ring, 38 ... Spacer, 41 ... High pressure core injection pipe, 42 ... High pressure core injection sparger, 43 ... Pressure vessel, 44 ... Pressure vessel nozzle, 45 ... Thermal sleeve, 46 ... Shroud 47, reactor internal pump, 48, core support plate, 49, fuel assembly, 50, upper lattice plate, 51, steam-water separator, 52, steam dryer, 54, pipe cutting length, 55, brace cutting length.

Claims (9)

原子炉の圧力容器に設けられた圧力容器ノズルに接続された圧力容器側配管と、この圧力容器側配管にスリーブを介して接続された接続配管と、この接続配管に接続された90°エルボと、この90°エルボと原子炉の上部格子板に設けられた高圧炉心注水スパージャとの間に接続された高圧炉心注水スパージャ側配管とを備え、前記接続配管は支持部材を介して前記上部格子板に固定されてなる高圧炉心注水系配管の組立方法において、前記圧力容器側配管と前記スリーブと前記接続配管と前記90°エルボと前記高圧炉心注水スパージャ側配管を所定の状態に接続したのちに前記接続配管を前記支持部材を介して前記上部格子板に固定することを特徴とする高圧炉心注水系配管の組立方法。A pressure vessel side pipe connected to a pressure vessel nozzle provided in the pressure vessel of the reactor, a connection pipe connected to the pressure vessel side pipe via a sleeve, and a 90 ° elbow connected to the connection pipe. A high-pressure core injection sparger-side pipe connected between the 90 ° elbow and the high-pressure core injection sparger provided on the upper grid plate of the reactor, wherein the connection pipe is connected to the upper grid plate via a support member. In the method of assembling the high pressure core injection system piping fixed to the above, after connecting the pressure vessel side piping, the sleeve, the connection piping, the 90 ° elbow and the high pressure core injection sparger side piping in a predetermined state, A method for assembling a high-pressure core water injection pipe, wherein a connection pipe is fixed to the upper lattice plate via the support member. 前記圧力容器側配管と前記接続配管を接続する際、原子炉の圧力容器と上部格子板の間に挿入された保持装置によって前記接続配管を保持し位置決めすることを特徴とする請求項1記載の高圧炉心注水系配管の組立方法。2. The high-pressure reactor core according to claim 1, wherein, when connecting the pressure vessel side pipe and the connection pipe, the connection pipe is held and positioned by a holding device inserted between a pressure vessel of a nuclear reactor and an upper lattice plate. How to assemble the water injection system. 前記圧力容器側配管の端部に取り付けたパイプ芯出し治具と前記接続配管の端部に取り付けた配管長さ計測治具によって前記接続配管の切断長さを計測し、前記接続配管に取り付けたブレース長さ計測治具によって前記支持部材の切断長さを計測することを特徴とする請求項1記載の高圧炉心注水系配管の組立方法。The cutting length of the connection pipe was measured by a pipe centering jig attached to an end of the pressure vessel side pipe and a pipe length measuring jig attached to an end of the connection pipe, and the jig was attached to the connection pipe. 2. The method for assembling a high-pressure core water injection system piping according to claim 1, wherein a cutting length of said support member is measured by a brace length measuring jig. 前記90°エルボと前記接続配管の接続は、前記接続配管と前記支持部材の溶接による溶接変形量を見込んで行うことを特徴とする請求項1記載の高圧炉心注水系配管の組立方法。2. The method for assembling a high-pressure core injection system according to claim 1, wherein the connection between the 90 ° elbow and the connection pipe is performed in consideration of a welding deformation caused by welding between the connection pipe and the support member. 前記圧力容器側配管または前記接続配管と前記スリーブとの接続は、前記スリーブと前記スリーブの端に結合されるカラーの間に挿入されるシールリング押え治具によって前記スリーブの外周面に形成された溝に設けられたシールリングを押えて脱落を防止しながら行うことを特徴とする請求項1記載の高圧炉心注水系配管の組立方法。The connection between the pressure vessel side pipe or the connection pipe and the sleeve was formed on the outer peripheral surface of the sleeve by a seal ring holding jig inserted between the sleeve and a collar coupled to an end of the sleeve. 2. The method for assembling a high-pressure core water injection pipe according to claim 1, wherein the sealing is performed while pressing a seal ring provided in the groove to prevent the pipe from falling off. 原子炉の圧力容器に設けられた圧力容器ノズルに接続された圧力容器側配管と、この圧力容器側配管にスリーブを介して接続された接続配管と、この接続配管に接続された90°エルボと、この90°エルボと原子炉の上部格子板に設けられた高圧炉心注水スパージャとの間に接続された高圧炉心注水スパージャ側配管とを備え、前記接続配管は支持部材を介して前記上部格子板に固定されてなる高圧炉心注水系配管の組立装置において、前記圧力容器側配管と前記接続配管を接続する際、原子炉の圧力容器と上部格子板の間に挿入され前記接続配管を保持する保持装置を備えたことを特徴とする高圧炉心注水系配管の組立装置。A pressure vessel side pipe connected to a pressure vessel nozzle provided in the pressure vessel of the reactor, a connection pipe connected to the pressure vessel side pipe via a sleeve, and a 90 ° elbow connected to the connection pipe. A high-pressure core injection sparger-side pipe connected between the 90 ° elbow and the high-pressure core injection sparger provided on the upper grid plate of the reactor, wherein the connection pipe is connected to the upper grid plate via a support member. In the assembling apparatus of the high-pressure core water injection system piping fixed to, when connecting the pressure vessel side pipe and the connection pipe, a holding device that is inserted between the pressure vessel of the reactor and the upper lattice plate and holds the connection pipe An assembling apparatus for a high-pressure core water injection system piping provided. 前記圧力容器側配管の端部および前記接続配管の端部に取り付けられて前記接続配管の切断長さを計測するパイプ芯出し治具および配管長さ計測治具を備えたことを特徴とする請求項6記載の高圧炉心注水系配管の組立装置。A pipe centering jig and a pipe length measuring jig attached to an end of the pressure vessel side pipe and an end of the connection pipe for measuring a cutting length of the connection pipe are provided. Item 7. An apparatus for assembling a high-pressure core injection system piping according to Item 6. 前記接続配管に取り付けられて前記支持部材の切断長さを計測するブレース長さ計測治具を備えたことを特徴とする請求項6記載の高圧炉心注水系配管の組立装置。7. The apparatus for assembling a high-pressure core injection system piping according to claim 6, further comprising a brace length measuring jig attached to said connection piping to measure a cutting length of said support member. 前記圧力容器側配管または前記接続配管と前記スリーブとを接続するときに前記スリーブと前記スリーブの端に結合されるカラーの間に挿入され前記スリーブの外周面に形成された溝に設けられたシールリングを押えて脱落を防止するシールリング押え治具を備えたことを特徴とする請求項6記載の高圧炉心注水系配管の組立装置。A seal provided in a groove formed in an outer peripheral surface of the sleeve and inserted between the sleeve and a collar coupled to an end of the sleeve when connecting the pressure vessel side pipe or the connection pipe to the sleeve; The assembly apparatus for a high-pressure core water injection pipe according to claim 6, further comprising a seal ring holding jig for holding the ring to prevent the ring from falling off.
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008261854A (en) * 2007-04-09 2008-10-30 General Electric Co <Ge> Methods and devices for operating and repairing nuclear reactor
KR20190058030A (en) * 2017-11-21 2019-05-29 정진만 Method fixing thermal sleeve between cold leg and SI nozzle
WO2023135724A1 (en) * 2022-01-14 2023-07-20 日立Geニュークリア・エナジー株式会社 In-reactor piping structure for nuclear reactor

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008261854A (en) * 2007-04-09 2008-10-30 General Electric Co <Ge> Methods and devices for operating and repairing nuclear reactor
KR20190058030A (en) * 2017-11-21 2019-05-29 정진만 Method fixing thermal sleeve between cold leg and SI nozzle
KR101993668B1 (en) 2017-11-21 2019-06-26 정진만 Method fixing thermal sleeve between cold leg and SI nozzle
WO2023135724A1 (en) * 2022-01-14 2023-07-20 日立Geニュークリア・エナジー株式会社 In-reactor piping structure for nuclear reactor

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