Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Effect of slab stiffness on floor response spectrum and fragility of equipment in nuclear power plant building

  • Yousang Lee (Department of Architecture and Architectural Engineering, Seoul National University) ;
  • Ju-Hyung Kim (Department of Civil Engineering, University of Colorado Denver) ;
  • Hong-Gun Park (Department of Architecture and Architectural Engineering, Seoul National University)
  • Received : 2023.02.23
  • Accepted : 2023.07.07
  • Published : 2023.11.25
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Abstract

The floor response spectrum (FRS) is used to evaluate the seismic demand of equipment installed in nuclear power plants. In the conventional design practice of NPP structure, the FRS is simplified using the lumped-mass stick model (LMSM), assuming the floor slab as a rigid diaphragm. In the present study, to study the variation of seismic response in a floor, the FRSs at different locations were generated by 3-D finite element model, and the response was compared to that of the rigid diaphragm model. The result showed that the FRS significantly varied due to the large opening in a floor, which was not captured by the rigid diaphragm model. Based on the result, seismic fragility analysis was performed for the anchorage of a heat exchanger, to investigate the effect of location-dependent FRS disparity on the high confidence low probability of failure (HCLPF).

Keywords

Acknowledgement

This work was supported by the National Research Foundation of Korea(NRF) grant funded by the Korea Government(MSIT) (No. RS2022-00144409).

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