FIELD EXPERIENCE OF WATER JET PEENING APPLICATION ON BWR REACTOR INTERNALS WITH CRACKED SURFACES

摘要

Water Jet Peening (WJP) has been widely applied to Japanese nuclear power plants since 1999, as an approved mechanical mitigation technique against stress corrosion cracking (SCC) on materials used for nuclear reactors [1]. Existing laboratory experience and analysis indicated that WJP had no negative impact on pre-existing cracks, such as crack propagation during its application, although there was no field experience of applying WJP on cracked surfaces. Recently, The Japan Atomic Power Company (JAPC) and Hitachi-GE Nuclear Energy, Ltd. (HGNE) have successfully applied WJP on cracked surfaces, where the cracks left as is with the requirement that they should be inspected periodically under JSME code.