自由液面饱和工况下压力容器外部自然循环及CHF的特性分析

Characteristics of Natural Circulation Flow and CHF under External Reactor Vessel Cooling within Surface Saturated Conditions

基于一维稳态两相守恒方程、低流速过冷沸腾净蒸汽点计算方法和漂移流模型,建立反应堆压力容器(RPV)外部自然循环特征分析的数值计算模型。结合SULTAN关系式,综合分析熔融物衰变热功率、流道间隙、入口阻力系数和堆腔淹没水位对RPV外部冷却过程的影响。

Based on the one-dimensional conservation equations, the numerical calculation model has been established for the analysis of the characteristics of natural circulation flow on the outer surface of reactor pressure vessel utilizing the net vapor generation model in low-flow subcooled boiling and drift flux model. Combined with the SULTAN correlation, a comprehensive study of the effects of heating power, flow channel clearance, loss coefficient of inlet area and flooding levels on the outer cooling process of lower head under in-vessel condition has been conducted in this study.