Structure for suppressing flow vibration of instrumentation guide tube

Abstract

An upper holeA and a lower holeB are provided at two positions, namely, upper and lower portions, of a side surface of a guide tube, and a thimble tubeis pressed against an inner circumferential surface of the guide tube, by a differential pressure between coolant inside and outside the upper holeA and the lower holeB. 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, 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.