Investigation on constraint effect of reactor pressure vessel under pressurized thermal shock |
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Authors: | Jin-Su KimJae-Boong Choi Young-Jin Kim Youn-Won Park |
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Affiliation: | a School of Mechanical Engineering, Sungkyunkwan University, 300 Chunchun-dong, Jangan-gu, Suwon, Kyonggi-do 440-746, South Korea b Radiation and Engineering Research Department, Korea Institute of Nuclear Safety, 19 Kusong-dong, Yusong-gu, Taejon 305-338, South Korea |
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Abstract: | In recent years, the integrity of reactor pressure vessels (RPVs) under pressurized thermal shock (PTS) accident has been treated as one of the most critical issues. Under PTS condition, the combination of thermal stress due to a steep temperature gradient and mechanical stress due to internal pressure causes considerable tensile stress inside the RPV wall. As a result, cracks on the inner surface of RPVs can experience elastic-plastic behavior that can be explained using the J-integral. In such a case, however, the J-integral may possibly lose its validity due to the constraint effect. The degree of constraint effect is influenced by the loading mode, the crack geometry and the material properties. In this paper, three-dimensional finite element analyses are performed for various surface cracks to investigate the effect of clad thickness and crack geometry on the constraint effect. A total of 36 crack geometries are analyzed and results are presented by the two-parameter characterization based on the J-integral and the Q-stress. |
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Keywords: | EPFM elastic-plastic fracture mechanics HRR Hutchinson and Rice Rosengren LEFM linear elastic fracture mechanics NESC network for evaluating structural components PTS pressurized thermal shock RPV reactor pressure vessel |
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