Abstract
The number of traditionally excellent coastal lithologic nuclear power plants is limited. It is a trend to develop nuclear power plants on soil sites in inland areas. Therefore, the seismic safety and adaptability of non-rock nuclear power plant (NPP) sites are the key concerns of nuclear safety researchers. Although the five site categories are clearly defined in the AP1000 design control documents, the effects of nuclear power five site conditions and soil nonlinearity on the seismic response characteristics of nuclear island buildings have not been systematically considered in previous related studies. In this study, targeting the AP1000 nuclear island structure as the research object, three-dimensional finite element models of a nuclear island structure at five types of sites (firm rock site (FR), soft rock site (SR), soft-to-medium soil site (SMS), upper bound soft-to-medium site (SMS-UB), and soft soil site (SS)) are established. The partitioned analysis method of soil-structure interaction (PASSI) in the time-domain is used to investigate the effects of site hardness and nonlinearity on the acceleration, displacement, and acceleration response spectrum of the nuclear island structure under seismic excitation. The incremental equilibrium equation and explicit decoupling method are used to analyze the soil nonlinearity described by the Davidenkov model with simplified loading-reloading rules. The results show that, in the linear case, with the increase of site hardness, the peak ground acceleration (PGA) and the peak of acceleration response spectrum of the nuclear island structure increase except for the FR site, while the maximum displacement decreases. In nonlinear analysis, as the site hardness increases, the PGA, maximum displacement, and the peak of acceleration response spectrum of the nuclear island structure increase. The peak value of the acceleration response spectrum in the nonlinear case is greater than that in the linear case for FR, while smaller for SR and soil sites. The site nonlinearity reduces the peak values of the response spectrum for SR and soil sites much more as the site hardness decreases. The results of this study can provide a reference for design of nuclear island structures on soil and rock sites.
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The authors gratefully acknowledge the financial support of this work by the National Natural Science Foundation of China (Nos. 51978337, U2039209).
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Supported by: National Natural Science Foundation of China under Grant Nos. 51978337 and U2039209
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Lv, H., Chen, S. Seismic response characteristics of nuclear island structure at generic soil and rock sites. Earthq. Eng. Eng. Vib. 22, 667–688 (2023). https://doi.org/10.1007/s11803-023-2186-8
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DOI: https://doi.org/10.1007/s11803-023-2186-8