確率論的破壊力学手法を用いたステンレス鋳鋼配管の許容亀裂寸法の算出

抄録

The allowable flaw sizes of cast austenitic stainless steel(CASS) pipes were determined by probabilistic fracture mechanics (PFM) analysis code “PREFACE”, in a similar way as the technical basis of ASME Section XI Code Case N-838(CC-N-838) to set the target sizes of performance demonstration certification of nondestructive testing. In order to confirm the validity of PREFACE, the allowable flaw sizes calculated by PREFACE were compared with those in the technical basis of CC-N-838. As a result, although J calculation method and the embrittlement prediction model of CASS are different, these allowable flaw sizes were qualitatively consistent.