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秦山二期核电厂是两环路电功率为 ６００ ＭＷ的核电厂，而已进行过概率安全分析的广东大亚湾核电厂则为三环路９００ＭＷ核电厂。本文以去掉一个环路的９００ＭＷ三环路核电厂为参考电厂来进行两环路核电厂概率安全分析（ＰＳＡ）。分析结果指出：１）只要满足确定论安全审查，两环路核电厂的概率安全特性不亚于三环路核电厂的概率安全特性；２）参考的两环路核电厂堆熔频率为２．４２×１０－５／（堆年）；３）参考的两环路核电厂严重事故的支配性初因依次为失水事故（ＬＯＣＡ）和丧失热阱。本研究对两环路核电厂设计、建造和运行提供了有益的参考。
The Qinshan Phase II NPP is a nuclear power plant with two MWs of 600 MW and the Daya Bay Nuclear Power Plant, which has conducted probabilistic safety analysis, is the 900 MW NPP of the Third Ring Road. In this paper, a loop of 900MW Third Ring Road nuclear power plant as the reference power plant to carry out the two loop nuclear power plant probability safety analysis (PSA). The results of the analysis indicate that: 1) As long as the deterministic safety review is satisfied, the probability and safety characteristics of the two-ring nuclear power plant are as good as those of the third-ring nuclear power plant; 2) The heap melting frequency of the two-loop nuclear power plant is two. 42 × 10-5 / (pile year); 3) The dominant initial causes of the serious accidents in the two-ring nuclear power plant at reference are followed by loss of water (LOCA) and loss of heat traps. This research provides a useful reference for the design, construction and operation of Lianglun NPP.