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Damping is the generic name ascribed to the numerous energy dissipation mechanisms in a system. Damping ratio is an important input parameter in the seismic analysis of the main circuit of nuclear power plants. The new national standard GB50267-2019 has refined and updated the damping ratios of various items. The biggest difference compared to the 1997 version is that the damping ratio of equipment items in the SL-2 situation has been decreased from 4 to 3% overall, while the mature application experience at home and abroad is 4%. This article investigates the requirements for damping values of equipment components in various national regulations to trace the changes in damping ratio values. In addition, sensitivity analysis was conducted on typical damping values based on existing models by establishing a classical dynamic model. The impact of damping ratio changes on the seismic analysis of main equipment was studied, which can provide reference or suggested solutions for subsequent new designs.

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Brief Introduction and Analysis of Damping Values in Seismic Analysis of for Nuclear Power Plants

  • 会议论文

  • 发表日期：

    2026年

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  • Zhaoyu Nie,
  • Shijian Wu,
  • Xiao Xu,
  • Bingchi Lin,
  • Xingang Li,
  • Zhicheng Lu

摘要

Damping is the generic name ascribed to the numerous energy dissipation mechanisms in a system. Damping ratio is an important input parameter in the seismic analysis of the main circuit of nuclear power plants. The new national standard GB50267-2019 has refined and updated the damping ratios of various items. The biggest difference compared to the 1997 version is that the damping ratio of equipment items in the SL-2 situation has been decreased from 4 to 3% overall, while the mature application experience at home and abroad is 4%. This article investigates the requirements for damping values of equipment components in various national regulations to trace the changes in damping ratio values. In addition, sensitivity analysis was conducted on typical damping values based on existing models by establishing a classical dynamic model. The impact of damping ratio changes on the seismic analysis of main equipment was studied, which can provide reference or suggested solutions for subsequent new designs.