液态金属反应堆湿式燃料贮存桶内部事件概率安全分析

液态金属冷却剂在给反应堆带来运行安全与热效率优势的同时，也给反应堆带来了复杂的换料系统，其中大型液态金属反应堆采用的湿式乏燃料贮存桶是乏燃料卸料过程的核心设备，临时装载了大量的乏燃料组件，具备一定的安全风险。本文采用概率安全分析（PSA）方法对乏燃料贮存桶进行风险评价，通过运行状态分析、始发事件分析、事故序列分析以及简单的定量化，初步获得其导致乏燃料组件发生损伤的事故序列和最小割集，识别了关键系统与设备。结果表明，相对于反应堆本身的风险，乏燃料贮存桶本身风险虽低但依然不可忽略，且风险评价结果对反应堆的运行方式以及清洗系统的可靠性较为敏感。此外还对该系统的设计改进与安全优化进行了讨论。

Internal Event Probabilistic Safety Analysis of Liquid Metal Reactor Spent Fuel Container with Coolant

Liquid metal coolant brings advantage about nuclear safety and heat efficiency, at the same time, complicating the reactor refueling system. Spent fuel container with coolant is the core of the spent fuel unloading process of the large liquid metal reactor, and brings new risk because it maybe contain a large amount of spent fuels. The risk analysis of a typical spent fuel container with probability safety assessment (PSA) method was completed, and the spent fuel damage sequence/minimal cuts and list of key component about the risk with the plant operation state assessment, initial event assessment, accident sequence assessment and simply risk quantification were identified. The results show that the risk of spent fuel container is much lower than that of the core but not can be ignored, and the quantified result of PSA is sensitive to the operation mode of the reactor and the reliability of the fuel cleaning system. Finally some design improvement suggestions were given base the quantified result and sensitivity analysis.