西安脉冲堆定量安全目标初步研究

Preliminary study on quantitative safety goals of the Xi'an pulsed reactor

为了提高西安脉冲堆运行安全管理水平,结合西安脉冲堆纵深防御特点及现有运行安全水平,以概率安全分析结果为依据,分析提出了西安脉冲堆安全目标体系构成和安全目标定量化数值。研究表明,西安脉冲堆安全目标体系应补充概率安全目标和辐射防护定量约束目标,概率安全目标包含堆芯损伤频率值、少量放射性释放频率值。提出的定量化安全目标建议为:堆芯损伤频率限值1×10^(-5)/堆年,少量放射性释放频率限值1×10-^(7)/堆年;正常工况下,公众有效剂量不超过0.1 m Sv·a^(-1),工作人员有效剂量不超过2 m Sv·a^(-1);事故工况下的定量辐射防护目标还需要进一步的研究。

To promote the safety standards and operation management in Xi＇an pulsed reactor,the construction of a system of safety goals and its quantitative value were put forward and analyzed on the basis of the result of probabilistic safety assessment（ PSA）,with considering of the characteristic of XAPR＇s defense in-depth and its operational safety level. The results demonstrated that XAPR safety goals should be supplemented with objectives of probability quantitative and radiation protection dose constraints. Safety goals were proposed including core damage frequency of less than 1 × 10^-5 per reactor year,and small release frequency of less than 1 × 10^-7 per reactor year; public dose of less than 0.1 m Sv·a^-1,and occupational dose of less than 2 m Sv·a^-1 in normal conditions. In accident conditious however,further work about the protection goals is expected.