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根据一级概率安全分析(Probabilistic Safety Analysis,PSA)的结果,安全壳内置换料水箱(In-containment Refueling Water Storage Tank,IRWST)子系统的初始设计导致安注管线破裂(Safety Injection Line Break,SI-LB)始发事件对堆芯损坏频率(Core Damage Frequency,CDF)有较大的贡献。本文提出了IRWST子系统的设计改进方案,将IRWST水箱内的滤网由两个(A/B)增加为三个(A/B/C),并通过管线实现滤网之间的相互连接。通过重新构建故障树对改进后的IRWST子系统进行建模分析,并对相应的事件树以及一级PSA模型进行详细的定量化计算。结果表明,IRWST子系统这一改进能够显著降低堆芯损坏风险。IRWST子系统的改进将SI-LB始发事件的CDF降低了53.5%,将整个一级PSA的CDF降低了21.5%。
According to the results of the Probabilistic Safety Analysis (PSA), the initial design of the In-containment Refueling Water Storage Tank (IRWST) subsystem resulted in a Safety Injection Line Break (SI) -LB) incidents have a greater contribution to the core damage frequency (CDF). This paper presents an improved design of the IRWST subsystem, which increases the number of filters in the IRWST tank by two (A / B) to three (A / B / C) and interconnects the filters through the pipeline. Through the reconstruction of the fault tree, the improved IRWST subsystem is modeled and analyzed, and the corresponding event tree and the first-level PSA model are quantitatively and quantitatively calculated. The results show that this improvement of the IRWST subsystem can significantly reduce the risk of core damage. Improvements in the IRWST subsystem reduced the CDF of SI-LB incidents by 53.5% and the CDF of whole-stage PSAs by 21.5%.