B-43 内圧曲げ複合荷重を受ける配管に対する新しい J 積分評価法の開発とその欠陥評価クライテリアへの適用

概要

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Considering a rational maintenance rule of Light Water Reactor piping, reliable flaw evaluation criteria are essential to determine how a detected flaw is detrimental to continuous plant operation. Some analytical efforts are provided as the flaw evaluation criteria using load-correction factors such like the Z-factor in the ASME Code Section XI. The present correction factors were conventionally determined taken conservatism and simplicity into account, however, the effect of internal pressure, which would be an important factor under actual plant condition, was not adequately considered. In this study, a J-estimation scheme, "LBB.ENGC" for ductile fracture analysis of circumferentially through-wall-cracked pipes subjected to combined loading was newly developed to have a better prediction with more realistic manner. This method is explicitly incorporated the contribution of both bending and tension due to internal pressure by means of the scheme compatible with an arbitrary combined loading history. The correction factor based on the new J-estimation scheme was then compared with the present correction factors, and the predictability of the current flaw evaluation criteria was quantitatively evaluated in consideration of internal pressure.
一般社団法人日本機械学会の論文
2000-03-29