Abstract
The Water Jet Peening (WJP) is a well-known method to reduce residual stress. While direct injection water jet is usually used for the WJP, it was found that reflected water jet is also effective for reducing stress. By using this Reflected Water Jet Peening (RWJP), it can be easier and simpler to conduct the WJP onto secluded surfaces or components with a complicated shape. The RWJP was applied to a shroud weld line behind a core spray sparger in a pressure vessel of a domestic BWR.
