华龙一号非能动安全壳冷却系统热工水力分析

本文采用不可压缩流体均匀流模型对华龙一号(HPR1000)的非能动安全壳冷却系统（PCS）进行数值模拟，在反应堆冷却剂系统（RCS）大破口丧失冷却剂事故（LOCA）工况下对PCS进行热工水力分析，并对PCS设计工况进行性能分析计算。结果表明：PCS的非能动运行特性与事故进程具有很好的匹配能力，能在事故早期极快启动，并在24 h内将安全壳的温度和压力稳定在安全范围内。通过PCS设计工况的换热性能分析，PCS在运行5 h后进入两相流传热阶段，当换热水箱介质达到饱和温度后仍能长期稳定运行，导出安全壳内热量。

Thermal-hydraulic Analysis of Passive Containment Cooling System of HPR1000

The incompressible fluid uniform flow model was used to simulate the passive containment cooling system (PCS) of HPR1000 in this paper. The thermal-hydraulic analysis of PCS was carried out under the condition of large break loss of coolant accident (LOCA) of reactor coolant system (RCS) and the performance analysis and calculation of PCS design conditions were carried out. The results show that the passive operation characteristics of PCS have a good matching ability with the accident process. PCS can start very quickly in the early stage of the accident and keep the temperature and pressure of the containment in a safe range within 24 h. According to the analysis of heat transfer performance of PCS design conditions, PCS enters the two-phase heat transfer stage after 5 h of operation, and can run steadily for a long time after the water in the tank reaches saturation temperature. The heat in the containment can be removed.