美国NRC关于核电站设计地震动时程的相关规定

Acceptance criteria of US NRC on design ground motion time history for nuclear power plant

美国核管理委员会(NRC)颁布的标准审查大纲(SRP)第3.7.1节对核电站设计地震动时程进行了详细的规定,是目前核工程领域确定结构抗震分析所需输入地震动所遵循的基本准则。针对美国NRC-SRP3.7.1中关于核电站设计地震动时程的验收准则,分别从"种子"地震动时程的选取、设计地震动时程的相关性、持时参数、速度和位移特性以及结构非线性分析对设计地震动时程的特殊要求这五个方面,将不同版本SRP3.7.1(1989、2007和2014)对核电站设计地震动时程的规定进行了梳理,并对SRP3.7.1中的单组时程法(方法-1和方法-2)以及多组时程法进行了论述、分析和对比。在此基础上,给出了一数值算例,利用基于小波函数的地震动反应谱拟合方法合成了满足所有版本SRP3.7.1中第一种单组时程法要求的设计地震动时程。

The standard review plan （SRP） 3.7.1, issued by US Nuclear Regulatory Commission （ NRC ）, specifies detailed acceptance criteria for the design ground motion time history for nuclear power plant, which at present are followed when defining the input ground motion for seismic analysis of structures in nuclear engineering. In this study, as to the acceptance criteria of US NRC-SRP3.7.1 on the design ground motion time history for nuclear power plant, from the five aspects, namely, the selection of ＂seed＂ ground motion time history, the correlation of design ground motion time history, the duration, the characteristics of peak velocity and peak displacement, and the special requirements on the design ground motion time history for nonlinear structural analysis, the requirements in different versions of SRP 3.7.1 （ 1989, 2007 and 2014） on the design ground motion time history for nuclear power plant are reviewed. The single-group time history method （method-1 and method-2） and the multi-group time history method specified in SRP 3.7.1 are discussed, analyzed and compared. Furthermore, with the response spectral matching method based on wavelet function, a numerical example is presented to generate the design ground motion time history that satisfies the requirements of the first approach of single-group time history method specified in all versions of SRP3.7.1.