核电厂设备抗震设计标准功率谱密度的生成方法

Generation Method of Target Power Spectral Density for Seismic Design of Nuclear Power Plant Equipment

对于核电厂设备抗震设计的输入地震波,通常要求其同时包络目标反应谱(RRS)和标准功率谱密度(PSD),然而目前国内外对标准PSD缺少统一的算法。在美国核管会标准审查大纲(SRP)3.7.1建议的标准PSD生成方法基础上,优化了迭代过程,提出了一个改进的标准PSD合成方法,并在2个核电设备RRS算例上实现了该方法。结果显示改进的标准PSD生成方法与RRS匹配程度较高,同时计算快速、简便,收敛精度与基于随机振动理论方法计算的结果相似,此法可以作为核电厂设备抗震设计输入人工地震波的标准PSD检验依据。

The input ground motion for the seismic design of nuclear power plant(NPP)equipment is required to envelop both the required response spectrum(RRS)and target power spectral density(PSD).However,no unified algorithm exists to generate the target PSD,whether at home or abroad.Based on the generation methodology for target PSD suggested in Section 3.7.1 of the Standard Review Plan(SRP)of U.S.Nuclear Regulatory Commission,this paper proposes an improved method for target PSD synthesis with the original iteration process optimized.The proposed method is applied successfully to the two RRS cases for nuclear equipment.The result shows that the improved method for target PSD generation is highly compatible with RRS and provides simple and rapid calculation,while its convergence accuracy is similar to the calculations by random vibration theory(RVT).This method is considered as the target PSD test basis for the input artificial ground motion(AGM)for the seismic design of NPP equipment.