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核电厂地震裕度评价(SMA)的关键之一是分析结构和部件的高置信度、低失效概率(HCLPF)值。本文先对概率易损性法、保守的确定性失效裕度法(CDFM)、试验法以及非线性瞬态分析法等几种HCLPF值计算方法进行介绍,然后以稳压器支撑模型为研究对象,通过非线性瞬态分析法和CDFM分析计算HCLPF值。结果表明2种结果有所差别,CDFM法较为保守,非线性瞬态分析方法更加准确,建议对稳压器等含非线性的结构与部件,应通过非线性瞬态分析法分析HCLPF值。
One of the keys to nuclear power plant seismic margin evaluation (SMA) is the analysis of high confidence and low probability of failure (HCLPF) values for structures and components. In this paper, several methods of calculating HCLPF such as Probabilistic Vulnerability Method, Conservative Deterministic Failure Margin Method (CDFM), experimental method and nonlinear transient analysis are introduced. Then, the model of voltage regulator support is taken as the research object HCLPF values were calculated by non-linear transient analysis and CDFM analysis. The results show that the two results are different. The CDFM method is more conservative and the nonlinear transient analysis method is more accurate. It is suggested that HCLPF values should be analyzed by non-linear transient analysis for non-linear structures and components such as voltage regulators.