公开(公告)号：EP2940693A4

公开(公告)日：2016-08-10

申请号：EP13866595

申请日：2013-12-24

申请人： MITSUBISHI HEAVY IND LTD

发明人： NISHIMURA TSUYOSHI ,  YAMAMOTO TAKESHI ,  SAKASHITA HIDESHI ,  SATO TOMONOBU ,  YAMAMOTO AKIO

IPC分类号： G21C19/02 ,  G21C1/08 ,  G21C13/00 ,  G21C13/036 ,  G21C13/06 ,  G21C17/003 ,  G21C17/017 ,  G21C17/10 ,  G21C19/20

CPC分类号： G21C13/036 ,  G21C1/086 ,  G21C7/14 ,  G21C13/06 ,  G21C17/003 ,  G21C17/017 ,  G21C19/02 ,  G21C19/207 ,  Y02E30/40

摘要： A nozzle repair method and a nuclear reactor vessel include: removing a trepanning portion (208) as a connection portion with respect to an in-core instrumentation cylinder (204) in a groove-welding portion (206); removing the in-core instrumentation cylinder (204) from a lower end plate (66); forming a plug attachment opening (211) by removing the groove-welding portion (206); applying a pressing load to the lower end plate (66) by attaching a plug (212) to the plug attachment opening (211); and welding and fixing the plug (212) attached to the plug attachment opening (211). Accordingly, since a repair is easily performed, it is possible to improve the workability and to decrease a repair cost.

公开(公告)号：EP2940694A4

公开(公告)日：2016-08-03

申请号：EP13866884

申请日：2013-12-24

申请人： MITSUBISHI HEAVY IND LTD

发明人： NISHIMURA TSUYOSHI ,  YAMAMOTO TAKESHI ,  SAKASHITA HIDESHI ,  TSUBOI KENSUKE ,  SATO TOMONOBU

IPC分类号： G21C19/02 ,  G21C13/00 ,  G21C13/036 ,  G21C17/003 ,  G21C17/017 ,  G21C17/10 ,  G21C19/20

CPC分类号： G21C13/036 ,  G21C17/003 ,  G21C17/017 ,  G21C19/02 ,  G21C19/207 ,  Y02E30/40

摘要： A nozzle repair method and a nuclear reactor vessel include: removing a trepanning portion (208) as a connection portion with respect to an in-core instrumentation cylinder (204) in a groove-welding portion (206); removing the in-core instrumentation cylinder (204) from a semi-spherical portion (66) as a lower end plate; forming a surface buttered-welding portion (210) by buttered-welding the surface of the groove-welding portion (206); forming a welding groove (212) by grooving the surface buttered-welding portion (210); inserting a new in-core instrumentation cylinder (204A) provided with a circumferential groove portion (204f) outside an instrumentation equipment guide passage (204d) into an attachment hole (203); and fixing the new in-core instrumentation cylinder (204A) by groove-welding the welding groove (212). Accordingly, since the nozzle welding area is suppressed to a predetermined range, the workability of the repair is improved.