WATERJET PEENING APPARATUS AND WATERJET PEENING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a waterjet peening apparatus and a waterjet peening method that are capable of decreasing risk of damage to each structure which is disposed in the periphery of a spray nozzle for spraying a waterjet flow and which is not to be subjected to waterjet peening, without influencing residual stress improvement effects due to shock waves generated by collapse of each bubble contained in the waterjet flow.;SOLUTION: Among WJP devices 5, a nozzle moving device 4 to which a spray nozzle 1 and an air bag 7 are mounted is disposed in a downcomer filled with cooling water 18 between a reactor pressure vessel and a reactor core shroud 15. The air bag 7 incorporating gas is expanded and placed between a cavitation jet flow 2 and a non-constructed object 6 until contacting a structure in the periphery.;SELECTED DRAWING: Figure 1;COPYRIGHT: (C)2016,JPO&INPIT