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<p>Passive cooling systems (PCS) are installed in third-generation nuclear power plants (NPP). The mass of the water tank constitutes a non-negligible portion of the total system mass. Existing studies demonstrated that PCS tanks have remarkable influences on the seismic response of NPP. However, the influence mechanisms are not fully understood due to the lack of experimental testing. Through numerical analysis and real-time hybrid simulation, this work investigates the influence of the PCS mass and liquid sloshing on the horizontal seismic response of NPP, respectively. The findings revealed that the addition of the PCS tank reduced the first-order frequency of the NPP by 12%. The reduced frequency was closer to the main frequency of ground motion specified in the RG1.60 code, which amplified the seismic response of the NPP. Given that the liquid sloshing frequency is approximately 60 times lower than the PCS-NPP system frequency, and the impulsive mass constitutes only 0.65% of the total system mass, the contribution of water to the seismic response of the NPP is negligible. Consequently, passive cooling systems can be considered as added mass while neglecting liquid sloshing in the seismic analysis and design for NPP.</p>

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Influence mechanisms of cooling water tanks on seismic response of nuclear power plants

  • 期刊论文

  • 发表日期：

    2025年12月8日

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  • Xiaohui Dong,
  • Zhenyun Tang,
  • Di Yao,
  • Xiuli Du,
  • Mi Zhao

摘要

Passive cooling systems (PCS) are installed in third-generation nuclear power plants (NPP). The mass of the water tank constitutes a non-negligible portion of the total system mass. Existing studies demonstrated that PCS tanks have remarkable influences on the seismic response of NPP. However, the influence mechanisms are not fully understood due to the lack of experimental testing. Through numerical analysis and real-time hybrid simulation, this work investigates the influence of the PCS mass and liquid sloshing on the horizontal seismic response of NPP, respectively. The findings revealed that the addition of the PCS tank reduced the first-order frequency of the NPP by 12%. The reduced frequency was closer to the main frequency of ground motion specified in the RG1.60 code, which amplified the seismic response of the NPP. Given that the liquid sloshing frequency is approximately 60 times lower than the PCS-NPP system frequency, and the impulsive mass constitutes only 0.65% of the total system mass, the contribution of water to the seismic response of the NPP is negligible. Consequently, passive cooling systems can be considered as added mass while neglecting liquid sloshing in the seismic analysis and design for NPP.