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概要

WJP (Water Jet Peening) technology generates the compressive residual stresses on the surface of the material by the extremely high impulse pressure caused by the collapse of cavitation bubbles when high-pressure water jet is discharged in the water. WJP is the promising technology for countermeasure of SCC initiated on the core structures of BWR with some advantages; Collection of foreign materials is not necessary, and WJP is applicable to the complicated structure in narrow space and improves relatively wide area with one scanning. This paper summarizes the effects of WJP on SCC mitigation and describes the development of application technology to BWR core support structures for SCC mitigation. In order to apply to the various welds of core support structures, various kinds of devices have been developed, which can effectively lead the water jet to the welds located in narrow spaces. Prior to the field application, confirmation tests and verification tests were executed on full-scale mockups in order to check the WJP shot parameters and to confirm the generated residual stresses.

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