西安脉冲堆满功率运行工况内部始发事件一级概率安全评价

针对西安脉冲堆(XAPR)2 MW满功率运行工况,建立了内部始发事件一级概率安全评价(PSA)模型,对始发事件识别、事故序列分析及可靠性数据处理等进行了研究。应用小事件树-大故障树方法,在Risk Spectrum平台上完成XAPR堆芯损伤事故序列的定量分析。结果表明,XAPR内部事件导致的堆芯损伤频率(CDF)为4.14×10~(-6)/(堆·年),对CDF贡献最大的为堆水池堆芯高度处大破口失水事故,支配性事故序列是大破口失水事故后紧急排水系统失效。研究结果证明XAPR具有较高的安全性。

Level 1 Probabilistic Safety Assessment of Xi'an Pulsed Reactor for Internal Initial Event at Full-power Operation

The model of level 1 probabilistic safety assessment (PSA) of Xi'an Pulsed Reactor (XAPR) was established for internal initial event at 2 MW full-power operation,and the initial event identification,accident sequence analysis and reliability data processing were studied.The quantitative analysis of core damage accident sequence was performed at Risk Spectrum software platform by using small event tree and large fault tree methodology.The results show that the core damage frequency (CDF) caused by internal initial event is about 4.14×10-6/(reactor·year) for XAPR.Large LOCA at reactor core height is the most important event leading to core damage,and the dominant accident sequence for the CDF is large LOCA at experimental hole,combined with the emergency pumping system failure.The final result confirms the relative high safety characteristics of XAPR.