This paper describes the effects of residual stress improvement by water jet peening, which is expected to improve the residual stress on various component surfaces in nuclear power plants as a preventative maintenance technique for preventing stress corrosion cracking and fatigue fracturing. Numerical analysis is performed to clarify the fundamental mechanism of residual stress improvement, and various tests are done to determine the fundamental characteristics of and suitable conditions for the residual stress improvement. Fundamental tests confirm the applicability of the water jet peening technique for nuclear power plants that can improve residual stress.
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