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http://dx.doi.org/10.3795/KSME-A.2004.28.11.1741

Assessment of Steam Generator Tubes with Multiple Axial Through-Wall Cracks  

Moon, Seong-In (성균관대학교 기계공학부)
Chang, Yoon-Suk (성균관대학교 기계공학부)
Kim, Young-Jin (성균관대학교 기계공학부)
Lee, Jin-Ho (한국원자력안전기술원)
Song, Myung-Ho (한국원자력안전기술원)
Choi, Young-Hwan (한국원자력안전기술원)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.28, no.11, 2004 , pp. 1741-1751 More about this Journal
Abstract
It is commonly requested that the steam generator tubes wall-thinned in excess of 40% should be plugged. However, the plugging criterion is known to be too conservative for some locations and types of defects and its application is limited to a single crack in spite of the fact that the occurrence of multiple through-wall cracks is more common in general. The objective of this research is to propose the optimum failure prediction models for two adjacent through-wall cracks in steam generator tubes. The conservatism of the present plugging criteria was reviewed using the existing failure prediction models for a single crack, and six new failure prediction models for multiple through-wall cracks have been introduced. Then, in order to determine the optimum ones among these new local or global failure prediction models, a series of plastic collapse tests and corresponding finite element analyses for two adjacent through-wall cracks in thin plate were carried out. Thereby, the reaction force model, plastic zone contact model and COD (Crack-Opening Displacement) base model were selected as the optimum ones for assessment of steam generator tubes with multiple through-wall cracks. The selected optimum failure prediction models, finally, were used to estimate the coalescence pressure of two adjacent through-wall cracks in steam generator tubes.
Keywords
Steam Generator Tube; Plastic Collapse; Failure Prediction Model; Limit Load Method; Plugging Criteria; Tube Rupture; Interaction Effect;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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