压力容器外部自然循环冷却（ERVC）系统作为AP1000的非能动安全系统之一，对熔融物堆内滞留，阻止放射性物质大规模释放起到关键的作用。本文通过RELAP5程序针对AP1000的ERVC系统建立模型，进行自然循环冷却的物理过程模拟，并对加热功率、冷却水过冷度、安全壳压力等关键参数进行了敏感性分析。除此之外，本文还对分析模型进行简化，并对比了两个模型的计算结果，证明了简化的合理性。%External reactor vessel cooling (ERVC)system,as one of the passive systems of AP1000 reactor,plays a key role for the melt in-vessel retention and prevention large-scale release of radioactive materials. In this paper the AP1000 ERVC system was modeled by RELAP5 code, simulated the physical processes of natural circulation cooling and investigated the effects of various thermal-hydraulic parameters such as decay power,subcooling,containment pressure. In addition,in this paper the simula-tion model of ERVC system was simplified,and proved the reasonableness of simplifi-cation by the compare of the results to the before calculations.
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