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Treatment of the interaction with the free surface of the component for combined subsurface flaws; Technical basis for revision of IWA-3300 and Table IWB/IWC-3510-1

機器の自由表面近傍にある内部欠陥と自由表面の干渉の扱い; IWA-3300と表IWB/IWC-3510-1の改定のための技術根拠

Lacroix, V.*; Dulieu, P.*; 長谷川 邦夫; Mares, V.*

Lacroix, V.*; Dulieu, P.*; Hasegawa, Kunio; Mares, V.*

耐圧機器に複数欠陥が検出されたとき、欠陥の形状をはっきりと決めるために欠陥の特性化(形状の作成化)が行われる。この特性化は維持規格のルールに従ってなされる。最初のステップは、欠陥と機器の自由表面の干渉であり、2番目に欠陥と欠陥の干渉である。ASME Code Sec. XIでは如何にして欠陥の合体と自由表面の干渉の扱いが欠けており、欠陥の特性化が明確になっていない。いくつかの非現実な欠陥の配列ではあるが欠陥評価の代表例を図で論文の中に示す。この論文は、IWA-3300, IWB/IWC-3510-1の欠陥の特性化における合体欠陥の扱いを明確にするためにASME Codeの改定の技術根拠として用いられる。

When flaws are detected in pressure retaining components, a flaw characterization has to be carried out in order to determine unequivocally the flaw geometry. This flaw characterization is done according to rules provided in the FFS codes. The first step of the flaw characterization addresses the interaction of the flaw and the free surface. The second step of the flaw characterization addresses the interaction of the flaw with the adjacent flaws. In the ASME Code Sec. XI, there is a lack on how to treat the interaction of a combined flaw and the free surface of the component. The ASME Code Sec. XI flaw characterization is not clear. Some typical examples of unrealistic flaw assessment rules are depicted in this paper. The paper is used as technical basis for improvement of the ASME Code in order to clarify the treatment of combined flaw in the flaw characterization (IWA-3300, IWB/IWC-3510-1)

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