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자료유형
학술저널
저자정보
저널정보
한국원자력학회 Nuclear Engineering and Technology Nuclear Engineering and Technology 제47권 제6호
발행연도
2015.1
수록면
766 - 775 (10page)

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The integrity assessment of reactor vessel internals should be conducted in the designprocess to secure the safety of nuclear power plants. Various loads such as self-weight,seismic load, flow-induced load, and preload are applied to the internals. Therefore, theAmerican Society of Mechanical Engineers (ASME) Code, Section III, defines the stress limitfor reactor vessel internals. The present study focused on structural response analyses ofthe upper guide structure upper flange. The distributions of the stress intensity in theflange body were analyzed under various design load cases during normal operation. Theallowable stress intensities along the expected sections of stress concentration werederived from the results of the finite element analysis for evaluating the structural integrityof the flange design. Furthermore, seismic analyses of the upper flange were performed toidentify dynamic behavior with respect to the seismic and impact input. The mode superpositionand full transient methods were used to perform timeehistory analyses, andthe displacement at the lower end of the flange was obtained. The effect of the dampingratio on the response of the flange was also evaluated, and the acceleration was obtained. The results of elastic and seismic analyses in this study will be used as basic information tojudge whether a flange design meets the acceptance criteria.

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