Study on Seismic Decoupling Criteria of Primary and Secondary System of Nuclear Power Plant
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摘要: 为拓展核电厂中主子系统抗震解耦范围，本文研究了核电规范中抗震解耦准则的要求、制定依据、适用范围和局限性，据此提出了一种修正刚度抗震解耦模型；采用两质点弹簧振子模型推导了主子系统耦联频率，基于误差分析绘制了各解耦模型解耦图；对各解耦模型进行适用性分析，并将解耦图准则与条款抗震解耦准则进行对比分析。结果表明：当主子系统频率比λfi<1且质量比λm<0.166时，本文提出的修正刚度抗震解耦模型可较好地模拟耦联效应引起的主子系统频率偏移，较规范中的解耦模型具有更小的频率误差；采用规范提供的解耦模型进行抗震设计时，条款抗震解耦准则基本可以保证解耦后主子系统的频率误差均小于10%。本文提出的修正刚度抗震解耦模型拓展了解耦图准则的适用范围，研究工作可为核电厂主子系统抗震解耦判断和解耦模型的选择提供参考。Abstract: To expand the scope of seismic decoupling of primary and secondary systems in nuclear power plants, the requirements, basis, scope of application and limitations of seismic decoupling criteria in nuclear power plant codes were studied in this paper, and a decoupling model with modified stiffness was proposed. The coupling frequency of the primary and secondary system was derived by spring-mass model of two mass points, decoupling diagrams of each decoupling model were drawn based on the error analysis. Analyzed the applicability of each decoupling model, and compared seismic decoupling diagram criterion with seimic clause decoupling criterion. The results show that when frequency ratio of primary and secondary system λfi <1 and mass ratio λm <0.166, the decoupling model proposed in this paper can better simulate the secondary system frequency offset caused by coupling effect, with smaller frequency error; the seismic decoupling criteria can ensure that frequency errors of the primary and secondary system after decoupling are less than 10% when adopted decoupling model provided in codes. The proposed modified stiffness decoupling model expands the applicability range of the seismic decoupling diagram criterion. The research work provide references for the assessment of seismic decoupling and the selection of decoupling models for the primary and secondary systems of nuclear power plants.
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图 1 主子系统连接形式
$ m $—质量；k—刚度；下标p、s—主系统、子系统；下标a、b—主子系统质量或支承刚度编号
Figure 1. Connection Form of Primary and Secondary Systems
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