先进非能动轻水堆应急行动水平的优化方法建议

Suggestions on Optimization Method of Emergency Action Level of Advanced Passive Light Reactor

应急行动水平(EAL)是核事故应急响应中确定应急状态等级的重要依据。大型先进非能动轻水堆的设计特性使得它的风险谱特征相对于目前在运的核电厂已发生了一定变化,其EAL也因此进行了改进。为了检验并优化先进非能动轻水堆的EAL,本文建议了一种风险指引的评价方法,利用核电厂概率安全分析(PSA)模型,在EAL与条件堆芯损伤概率(CCDP)之间建立近似关系,并由CCDP表示应急状态等级的区间范围,筛选出与应急状态等级不匹配的EAL,实现对其调整和优化的目的。

Emergency Action Level(EAL)is one important tool to determine the emergency classification level in nuclear emergency response.Because of its design characteristics,the risk spectrum characteristics of a large advanced passive light water reactor are different with that of the nuclear power plants currently in operation,and its EALs have been improved.This paper proposes a risk-informed assessment method,using the probabilistic safety assessment(PSA)model,to establish an approximate relationship between the EAL and the conditional core damage probability(CCDP).Based on the range of emergency classification by CCDP,the EAL mismatched with the emergency classification level can be screened to achieve the adjustment and optimization.