RELAP5再淹没临界后传热模型不确定性研究

在大破口失水事故最佳估算加不确定性分析中，再淹没临界后传热模型的不确定性评价研究十分关键。本文针对RELAP5再淹没临界后传热模型展开研究，选取Weisman在0.1~0.4 MPa条件下进行的圆管过渡沸腾试验数据对再淹没过渡沸腾关系式进行评价，选取爱达荷国家实验室（INEL）低压下的圆管膜态沸腾试验数据对再淹没膜态沸腾关系式进行评价，给出其概率分布类型和范围，为进行大破口失水事故不确定性分析打下基础。

Uncertainty Study on RELAP5 Reflood Post-CHF Heat Transfer Model

In the best estimate plus uncertainty analysis of large break loss of coolant accident (LBLOCA), the key is the study on uncertainty analysis of reflood post-CHF heat transfer model. In this paper, the uncertainty of RELAP5 reflood post-CHF heat transfer model was studied. The transition boiling model of reflood was evaluated through the transition boiling test data at 0.1-0.4 MPa by Weisman and the film boiling model of reflood was evaluated through the film boiling test data at low pressure by Idaho National Engineering Laboratory (INEL). The probability distribution function of the model was obtained, which can be used in the LBLOCA uncertainty analysis.