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A Study on the Integrity Evaluation Method of Subclad Crack Under Pressurized Thermal Shock
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 Title & Authors
A Study on the Integrity Evaluation Method of Subclad Crack Under Pressurized Thermal Shock
Kim, Yeong-Jin; Kim, Jin-Su; Gu, Bon-Geol; Choe, Jae-Bung; Park, Yun-Won;
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 Abstract
The reactor pressure vessel(RPV) is usually cladded with stainless steel to prevent corrosion and radiation embrittlement, and a number of subclad cracks have been found during an in-service-inspection. These subclad cracks should be assured for a safe operation under normal conditions and faulted conditions such as pressurized thermal shock(PTS). Currently available integrity assessment procedure for an RPV, ASME Code Sec. XI, are built on the basis of linear fracture mechanics (LEFM). In PTS condition, however, thermal stress and mechanical stress give rise to high tensile stress at the cladding and elastic-plastic behavior is expected in this area. Therfore, ASME Code Sec. XI is overly conservative in assessing the structural integrity under PTS condition. In this paper, the fracture parameter (stress intensity factor, K, and RT(sub)NDT) from elastic analysis using ASME Sec. XI and finite element method were validated against 3-D elastic-plastic finite element analyses. The difference between elastic and elastic-plastic analysis became significant with increasing crack depth. Therfore, it is recommended to perform elastic-plastic analysis for the accurate assessment of subclad cracks under TPS which causes plastic deformation at the cladding.
 Keywords
Reactor Pressure Vessel;Subclad Crack;Cladding;Surface Crack;Pressurized Thermal Shock;Stress Intensify Factor;
 Language
Korean
 Cited by
1.
PTS 사고하에서 J-Q해석법을 이용한 표면균열의 구속효과 고찰,김진수;최재붕;김윤재;김영진;

대한기계학회논문집A, 2002. vol.26. 1, pp.105-112 crossref(new window)
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