Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Investigation of seismic responses of reactor vessel and internals for beyond-design basis earthquake using elasto-plastic time history analysis

  • Lee, Sang-Jeong (Department of Mechanical Engineering, Yonsei University) ;
  • Lee, Eun-ho (Department of Mechanical Engineering, Yonsei University) ;
  • Lee, Changkyun (Department of Mechanical Engineering, Yonsei University) ;
  • Park, No-Cheol (Department of Mechanical Engineering, Yonsei University) ;
  • Choi, Youngin (Korea Institute of Nuclear Safety) ;
  • Oh, Changsik (Korea Institute of Nuclear Safety)
  • Received : 2020.04.28
  • Accepted : 2020.08.11
  • Published : 2021.03.25
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Abstract

Existing elastic analysis methods cannot be adhered to in order to assess the structural integrity of a reactor vessel and internals for a beyond design basis earthquake. Elasto-plastic analysis methods are required, and the factors that affect the elasto-plastic behavior of reactor materials should be taken into account. In this study, a material behavior model was developed that considers the irradiation embrittlement effect, which affects the elasto-plastic behavior of the reactor material. This was used to perform the elasto-plastic time history analyses of the reactor vessel and its internals for beyond design basis earthquake. For this investigation, appropriate beyond design basis earthquakes and reliable finite element models were used. Based on the analysis results, consideration was given to the load reduction effect and the margin change. These were transferred to the internals due to the plastic deformation of the reactor vessel.

Keywords

Acknowledgement

This work was supported by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the Ministry of Trade, Industry and Energy (MOTIE) of the Republic of Korea (No.20194030202460). Also, this work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. NRF-2019M2D2A2048296)

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