公开(公告)号：EP2128870B1

公开(公告)日：2013-12-25

申请号：EP08711857.6

申请日：2008-02-22

申请人： Mitsubishi Heavy Industries, Ltd.

发明人： UDA, Nobuki ,  WATANABE, Shigeyuki ,  HIROTA, Kazuo ,  SAKATA, Hideyuki ,  MORITA, Hideyuki ,  NAKAJIMA, Makoto ,  KURIMURA, Chikara ,  ICHIKAWA,Toshio

IPC分类号： G21C17/10 ,  G21C17/08 ,  G21C3/322

CPC分类号： G21C17/10 ,  G21C3/322 ,  G21C17/08 ,  G21Y2002/207 ,  G21Y2002/303 ,  G21Y2004/30

摘要： An upper hole 37A and a lower hole 37B are provided at two positions, namely, upper and lower portions, of a side surface of a guide tube 27, and a thimble tube 22 is pressed against an inner circumferential surface of the guide tube 27, by a differential pressure between coolant inside and outside the upper hole 37A and the lower hole 37B. It is preferable that an upper pressure adjustment hole and a lower pressure adjustment hole are provided at two positions, namely, upper and lower portions, of a side surface of an upper core support column 21, and a coolant flowing into the guide tube from an upper end of the guide tube flows out to the outside from inside the guide tube through a gap between the thimble tube and the upper hole, and also flows out to the outside from inside the upper core support column through the upper pressure adjustment hole, and a coolant flowing into the guide tube from a lower end of the guide tube flows out to the outside from inside the guide tube through a gap between the thimble tube and the lower hole, and also flows out to the outside from inside the upper core support column through the lower pressure adjustment hole.