WATER JET PEENING METHOD AND DEVICE

摘要

PROBLEM TO BE SOLVED: To maintain a proper injection distance region and to vertically inject in the axial direction of a control rod driving housing by placing an oscillating center of a nozzle at a position separated from a straight line connecting a center of the control rod driving housing on which a water jet peening device is placed and a center of the control rod driving housing to perform water jet peening to each other. SOLUTION: WJP(water jet peening) is carried out toward ICM.HSG1.1 (reactor core monitor housing) from a nozzle an oscillating center of which is placed on a position separated from straight line A.A and B.B connecting a center of control rod driving housings (CRD.HSG)2.1 and 2.2 on which a water jet peening(WJP) device 3 is placed and a center of the reactor core monitor housing (ICM.HSG)1.1 to each other. Consequently, it is possible to secure a proper jetting distance region 80-200 mm even in the case where the smallest distance between an ICM.HSG surface and a CRD.HSG surface is small. Accordingly, it is possible to jet in the proper jetting distance region in a state where the nozzle 4 is vertically directed in the axial direction of ICM.HSG.