BWR再循環系配管溶接継手のSCG亀裂進展解析と試験実施時期の検討

抄録

Stress Corrosion Cracking (SCC) has occurred in the weld joint of BWR PLR piping made of low carbon stainless steel from 2002. NISA of those days points to doing a volumetric examination by the frequency within 5 year operation for BWR PLR piping weld joint with which the measures against SCC are not taken, and has continued up to now. These instructions are based on the knowledge on JSME Fitness for Service 2002 edition. This paper examines a suitable successive examination frequency based on the measurement result of the crack depth detected for BWR PLR piping until now, and the SCC growth analysis using the SCC crack growth rate reference curve acquired in JNES.