The Mechanical Stress Improvement Process (MSIP) has been used successfully to mitigate intergranular stress corrosion cracking in boiling water reactor (BWR) welded stainless steel piping for many years. The MSIP technique creates compressive residual stresses at the inside surface of the welded joint while producing a slight permanent deformation of the pipe on one side of the weld. A prerequisite for use of MSIP on welded pipes susceptible to primary water stress corrosion cracking (PWSCC) in pressurized water reactors (PWR) is knowledge of the efficacy of the process when applied to dissimilar metal welds common to PWR primary cooling piping. This study uses two and three dimensional finite element models to evaluate the likely residual and operating stress profiles remaining after MSIP for typical dissimilar metal weld configurations, some of which are approved for leak-before-break (LBB) applications in pressurized water reactors.

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