核电厂事件序列的分阶段分析

概率安全评价(PSA)常用的技术手段是事件树(ET)结合故障树(FT)的分析方法,由于ET/FT都是以布尔逻辑为基础的静态分析技术,对于事件发生时间不同所引起的事故进程的变化缺乏足够的处理能力.然而,事件发生的准确时间对确定事故情景的发展有时是十分关键的.本研究针对压水堆核电厂丧失主给水后辅助给水系统失效时间对事故进程的影响,采用可靠性框图和事件树方法,分阶段对该事故序列进行评价,结果表明,此事故进程中,提高操纵员执行U1规程的可靠性有利于降低本事故情景下发生堆芯损坏的可能性.简要分析了该方法的适用性.

Accident Analysis by Phase-mission Methods in Nuclear Plant

Probabilistic Safety Assessment(PSA) is a systematic engineering evaluation technology,widely used in the nuclear power plant safety evaluation.In PSA,the Event Tree(ET) and Fault Tree(FT) are commonly used.However,it is common that a mission in different phases is executed by different systems or function modules in an engineering project.Conventional ET/FT are static analysis methods based on Boolean logic technology,not flexible enough to handle the dynamic problems directly,e.g.to change the accident sc...