Seismic Response Sensitivity Analysis of the Raft Foundation NPP Reactor Building under Different Site Conditions

Liang Li (), Rong Pan and Yu Lu
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Liang Li: Nuclear and Radiation Safety Center, Ministry of Ecology and Environment, Beijing 100082, China
Rong Pan: Nuclear and Radiation Safety Center, Ministry of Ecology and Environment, Beijing 100082, China
Yu Lu: Nuclear and Radiation Safety Center, Ministry of Ecology and Environment, Beijing 100082, China

Energies, 2022, vol. 15, issue 19, 1-15

Abstract: The seismic sensors used for automatic seismic trip systems (ASTS) of nuclear power plants (NPPs) are mainly arranged on the raft foundation of reactor buildings; however, the arrangement principle of seismic sensors is not clear. In order to analyze the seismic response sensitivity of the raft foundation of reactor building in NPPs, this paper carried out the seismic response sensitivity research at seven positions on the raft foundation of a reactor building under three site conditions, with two sets of time histories as input. The results show that (1) the peak acceleration of the outer ring point of the raft foundation was the largest, and the peak acceleration of the center point was the smallest; (2) the peak value of the floor response spectrum at the outer ring point of the raft foundation was the largest, and the peak value at the center point was the smallest. In an earthquake, the outer ring point of the raft foundation of the reactor building was the most sensitive. It was suggested that the seismic sensors used for ASTS should be arranged at the outer ring of the raft foundation NPP reactor building, and the shutdown threshold shall be calculated according to site conditions and structural characteristics.

Keywords: nuclear power plant; automatic seismic trip systems; ground motion parameters; soil–structure interaction (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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