三层熔池结构对AP1000反应堆压力容器外壁面热流密度的影响

严重事故后期，反应堆压力容器（RPV）下腔室内熔融物（U-Zr-O-Fe）可能发生分层。但目前采用的三层熔池结构分析模型之间有较大差异。本文采用了3种不同熔池结构模型:Esmaili & Khatib-Rahbar模型、Seiler模型、MAAP5程序模型分别计算了AP1000电厂的三层熔池结构并对RPV外壁面热流密度分布进行分析。结果表明，3种计算模型计算的熔池结构差异很大，进而影响了RPV外侧的热流密度分布。相比Esmaili & Khatib-Rahbar模型，Seiler模型更为保守。而MAAP5程序模型虽然在计算氧化物层和重金属层成分时是基于热力学理论，但轻金属层成分的确定方法尚待进一步改进。 

Effect?of 3-Layer Corium Pool Configurations on Heat Flux Distribution of RPV Outside Wall for AP1000

The corium in the lower plenum mainly containing U-Zr-O-Fe may separate into two immiscible liquids. However, there are significant differences?between existing 3-layer models.?The configurations of the pool in the lower plenum for AP1000 is assessed by three well-accepted 3-layer models developed by Esmaili & Khatib-Rahbar, Seiler, Salay & Fichot respectively. In addition, the heat transfer in the pool for these configurations is calculated in present study. The results show that the configuration which has the higher heat flux on the vessel contacted with the light metallic layer is obtained by the model developed by Seiler compared with Esmaili & Khatib-Rahbar model. The 3-layer model implemented in MAAP5 code is based on the Salay & Fichot model to treat the compositions in oxide and heavy metallic layers,?but assumes that the light metallic layer forms automatically after the corium falls down, which should be developed further.