Safety analysis of marine nuclear reactor in severe accident with dynamic fault trees based on cut sequence method
Safety analysis of marine nuclear reactor in severe accident with dynamic fault trees based on cut sequence method
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DOI：
10.1016/j.net.2022.08.014
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发表时间：
2022-09
影响因子：
2.7
通讯作者：
Fang Zhao;Shuliang Zou;Shoulong Xu;Junlong Wang;Tao Xu;D. Tang
中科院分区：
文献类型：
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作者：
Fang Zhao;Shuliang Zou;Shoulong Xu;Junlong Wang;Tao Xu;D. Tang
动态故障树（DFT）及其相关研究方法在安全分析和可靠性工程中受到广泛关注。DFT可以对具有顺序相关、资源共享和冷热备件的系统进行可靠性建模。提出了船舶碰撞事故和失水事故的DFT技术建模方法。采用切割序列（CS）/扩展切割序列（ECS）方法对DFT进行了定性和定量分析。结果表明，船舶碰撞事故中存在9种动态故障失效模式，描述了一个动态系统的故障传播过程，反映了整个事故系统的动态变化。用CS法求出发生船舶碰撞事故的概率为2.378 × 10− 9。船用核反应堆发生失水事故后，由于系统中含有热备件，这种失效模式不能用同一事件框架内的基本事件组合来表示。因此，使用ECS计算出反应堆失去控制的概率为8.125 × 10− 6。与CS相比，ECS在表达和处理能力方面更高效，在成本方面具有显著优势。
Dynamic fault tree (DFT) and its related research methods have received extensive attention in safety analysis and reliability engineering. DFT can perform reliability modelling for systems with sequential correlation, resource sharing, and cold and hot spare parts. A technical modelling method of DFT is proposed for modelling ship collision accidents and loss-of-coolant accidents (LOCAs). Qualitative and quantitative analyses of DFT were carried out using the cutting sequence (CS)/extended cutting sequence (ECS) method. The results show nine types of dynamic fault failure modes in ship collision accidents, describing the fault propagation process of a dynamic system and reflect the dynamic changes of the entire accident system. The probability of a ship collision accident is 2.378 × 10−9by using CS. This failure mode cannot be expressed by a combination of basic events within the same event frame after an LOCA occurs in a marine nuclear reactor because the system contains warm spare parts. Therefore, the probability of losing reactor control was calculated as 8.125 × 10−6using the ECS. Compared with CS, ECS is more efficient considering expression and processing capabilities, and has a significant advantage considering cost.