IVR熔池分层模型对压力容器安全裕量分析的影响  

Impact of Melt Pool Configuration to RPV Safety Margin Analysis in IVR Assessment

作　　者：杨晓[1] 杨燕华[1] 

机构地区：[1]上海交通大学核科学与工程学院,上海200240

出　　处：《原子能科学技术》2013年第2期254-259,共6页Atomic Energy Science and Technology

摘　　要：严重事故缓解策略熔融物堆内滞留(IVR)有效性评价方法中,关于压力容器下封头内的熔池结构是最具争议的问题。本工作对目前国际上采用的稳定熔池2层和3层结构,以及在熔池形成过程中可能形成的4层结构进行了比较研究,建立了这3种结构下的熔池分层传热模型,并分析了3种结构在不同反应堆功率水平下对压力容器有效性的影响。结果表明,压力容器安全裕量随反应堆功率的升高而减小,在4层熔池结构下发生压力容器熔穿失效的可能性最大。Melt pool configuration in the lower plenum of reactor pressure vessel （RPV） is the most controversial issue in the assessment methodology for severe accident strategy in vessel retention （IVR）. The generally accepted two-layer and three-layer melt pool configurations and a four-layer configuration which may form during the procedure of stable melt pool configuration formation were described. Heat transfer models of the three configurations were established, and effects of the three models to RPV integrity of reactors with different power levels were analyzed. The results show that RPV safety margin decreases as power level increases, and RPV failure is most likely to occur under tile condition of a four layer configuration.

关 键 词：熔融物堆内滞留 堆芯熔化 熔池分层结构 压力容器失效 

分 类 号：TL328[核科学技术—核技术及应用]