基于动态事件树的核电厂全厂断电事故分析  

Analysis of Station Blackout Accident in Nuclear Power Plant Based on Dynamic Event tree

作　　者：陈浩尹 王贺 赵强[1] 李磊[1] 王珑璁 Chen Haoyin;Wang He;Zhao Qiang;Li Lei;Wang Longcong(College of Nuclear Science and Technology,Harbin Engineering University,Harbin,150001,China)

机构地区：[1]哈尔滨工程大学核科学与技术学院,哈尔滨150001

出　　处：《核动力工程》2024年第5期192-198,共7页Nuclear Power Engineering

摘　　要：为解决传统事件树分析中缺少动态时间参数影响和较多依赖专家判断的不足,本研究使用动态事件树(DET)方法建立中国改进型三环路压水堆(CPR1000)核电厂全厂断电(SBO)事故响应模型。针对汽动辅助给水系统、交流电源恢复等分支节点建立时间相关分支,全面仿真事故分支结果,并计算分支概率与SBO事故下堆芯损伤的失效概率。计算结果表明,不同的汽动辅助给水系统运行时间与交流电源恢复时间对事故后果有明显影响,汽动辅助给水系统运行时间的增长可以延长电源恢复的时间窗口,但电源恢复时间存在上限,超过上限值则堆芯损伤不可避免。相比于传统事件树中计算得到的失效概率,动态事件树方法降低了失效概率值,挖掘出了潜在的安全裕度。Traditional event tree analysis ignores the dynamic time parameters and heavily relies on expert judgement.To tackle these issues,this study utilizes dynamic event tree(DET)method to to establish a response model for station blackout(SBO)accidents of China's improved three-loop PWR(CPR1000)nuclear power plant.Time-dependent branching is established for branch nodes such as turbine-driven auxiliary feedwater system and AC power recovery,and the accident branching results are comprehensively simulated,and the branching probability and the failure probability of core damage under SBO accident are calculated.The calculation results show that different running time of turbine-driven auxiliary feedwater system and recovery time of AC power supply have obvious influence on the accident consequences.The increase of running time of turbine-driven auxiliary feedwater system can prolong the time window of power supply recovery,but there is an upper limit for power supply recovery time,beyond which core damage is inevitable.Compared with the failure probability calculated by the traditional event tree,the dynamic event tree method reduces the failure probability value and develops the potential safety margin.

关 键 词：动态事件树(DET) 全厂断电(SBO)事故 动态方法 分支建模 

分 类 号：TL364.4[核科学技术—核技术及应用]