OS1405 評価不要欠陥規定における内部欠陥の応力拡大係数の評価(エネルギー機器の経年変化に関する健全性評価,オーガナイズドセッション)

概要

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Rules on Fitness-for-Service for nuclear power plants in JSME Code define allowable flaw depth for Class 1 vessels and piping in the Acceptance Standards. When a detected flaw is a subsurface flaw located near the component surface, the subsurface flaw should be transformed into the surface flaw. However, the inconsistency of allowable flaw depth could be seen at the transformation of subsurface flaw to the surface flaw. For the proposal of new revised Acceptance Standards, which keep a consistency of allowable flaw depth at the transformation, the effect of distance of subsurface flaw from the component surface on structural integrity of the flawed component should be evaluated. In this paper, the stress intensity factors of the subsurface flaws near the component surface were calculated to discuss the revised allowable flaw depth of subsurface flaw in Acceptance Standards. Since the estimations of stress intensity factors indicated that the stress intensity factors of subsurface flaws are not sensitive with distance from the component surface, the new revised Acceptance Standards for subsurface flaws should be only considered from the viewpoint of the consistency of allowable flaw depth at the transformation of subsurface into surface flaw.
一般社団法人日本機械学会の論文
2009-07-24