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논문 기본 정보

자료유형
학술저널
저자정보
김종성 (세종대학교) 김준영 (세종대학교)
저널정보
한국원자력학회 Nuclear Engineering and Technology Nuclear Engineering and Technology 제52권 제12호
발행연도
2020.12
수록면
2,918 - 2,927 (10page)
DOI
https://doi.org/10.1016/j.net.2020.05.008

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This paper proposes a simplified elastic-plastic analysis procedure using the penalty factors presented inthe Code Case N-779 for strain-based fatigue assessment of nuclear safety class 1 components undersevere seismic loads such as safety shutdown earthquake and beyond design-basis earthquake. First, asimplified elastic-plastic analysis procedure for strain-based fatigue assessment of nuclear safety class 1components under the severe seismic loads was proposed based on the analysis result for the simplifiedelastic-plastic analysis procedure in the Code Case N-779 and the stress categories corresponding tonormal operation and seismic loads. Second, total strain amplitude was calculated directly by performingfinite element cyclic elastic-plastic seismic analysis for a hot leg nozzle in pressurizer surge line subject tocombined loading including deadweight, pressure, seismic inertia load, and seismic anchor motion, aswell as was derived indirectly by applying the proposed analysis procedure to the finite element elasticstress analysis result for each load. Third, strain-based fatigue assessment was implemented by applyingthe strain-based fatigue acceptance criteria in the ASME B&PV Code, Sec. III, Subsec. NB, Article NB-3200and by using the total strain amplitude values calculated. Last, the total strain amplitude and the fatigueassessment result corresponding to the simplified elastic-plastic analysis were compared with thoseusing the finite element elastic-plastic seismic analysis results. As a result of the comparison, it wasidentified that the proposed analysis procedure can derive reasonable and conservative results.

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