安全壳卸压排放过程模化分析

针对大型非能动先进压水堆安全壳卸压排放过程中涉及的重要热工现象，采用系统性的关键现象识别及重要性分析方法，得到了大型非能动先进压水堆卸压排放过程中的现象过程识别与排序表（PIRT）。结果表明：排放管线及鼓泡器中对安全壳卸压排放过程影响程度较高的现象为临界和摩擦流、两相压降、几何尺寸及流动状态；乏燃料水池中对安全壳卸压排放过程影响程度较高的现象为冷凝、传热、几何尺寸、流体混合、不凝性气体及热分层。利用关键现象识别及重要性分析结果与现有缩放实验台架的搭建经验及研究结果，得到了安全壳卸压排放过程验证性试验装置搭建中应该遵循的相似准则，从而为安全壳卸压排放验证性试验装置的搭建提供设计基础和理论依据。

Scaling Analysis of Containment Depressurization Venting Process

The important thermal phenomena involved in containment depressurization venting process of large passive advanced pressurized water reactor (PWR) containment vessel were studied by systematic key phenomena identification and ranking method. The phenomena identification and ranking table (PIRT) of containment depressurization venting process was developed. The results show that critical and frictional flow, two phase pressure drop, geometric dimension and flow state are the phenomena which have higher influence on the depressurization venting process of containment vessel in vent line and sparger. The condensation, heat transfer, geometric dimensions, fluid mixing, non-condensable gases and thermal stratification are the phenomena with high influence on the depressurization venting process in spent fuel pools. Based on the results of key phenomena identification and importance analysis and the experience and research results of the existing scale test bench, the similarity criterion which should be followed in the model test equipment was obtained. The similarity criterion provides design basis and theoretical basis for the construction of the verification test device.