池式低温供热堆内部始发事件的确定

The Internal Initiating Events Identification of Pool-Type Low Temperature Heating Reactor

池式低温供热堆可以在冬季为北方城市提供清洁供暖,减缓因冬季供暖导致的环境污染。因此,低温供热堆需贴近城市建设,对其安全性要求更高。而通过概率安全分析能够量化反应堆放射性释放风险,识别反应堆设计薄弱环节并提供设计改进建议。始发事件分析是PSA(probabilistic safety analysis,概率安全分析)工作的第一步,也是PSA工作的基础。对典型池式低温供热堆功率运行工况下的内部始发事件开展分析,通过运用工程评价、主逻辑图分析和参考清单等方法的结合,完成了始发事件的识别。通过分析,确定了6组始发事件,可分为失去冷却剂和瞬态两大类别。

For pool-type low temperature heating reactor,it can provide clean heating for northern cities in winter and reduce the environmental pollution caused by heating.Therefore,it needs to be constructed close to the city,with high safety performance.The probabilistic safety analysis can quantify the radioactive release risk of the reactor,and identify reactor design weaknesses and provide suggestions for design improvement.The analysis of initiating events is the first step and the basis of PSA.This paper analyzes the internal initiating events of pool-type low temperature heating reactor under power operation condition,and completes the identification of initiating events by using the combination of engineering evaluation,main logic diagram analysis and reference list analysis.Then six groups of initiating events are identified,which can be divided into two categories:loss of coolant and transient.