二次侧非能动余热排出系统启动特性试验研究

二次侧非能动余热排出（ASP）系统是国内二代加型百万千瓦级压水堆核电厂应对全厂断电事故的重要改进项。为获取ASP系统的启动特性，基于比例模化方法设计建造了ASP系统试验装置。试验结果获取了不同因素对ASP系统启动特性的影响。结果表明：蒸汽发生器二次侧水装量与ASP系统隔离阀动作时间对ASP系统的启动特性影响较小；ASP系统的流量随蒸汽管线与回水管线阻力系数的增大而降低；蒸汽释放阀（VDA）的往复开启引起自然循环流量的波动，当VDA关闭后自然循环可恢复至稳定状态；换热管内初装水的水量影响ASP系统初始流量峰值；所有试验工况中均建立了稳定的自然循环。

Experimental Investigation on Starting Performance of Advanced Secondary Passive Residual Heat Removal System

Advanced secondary passive residual heat removal (ASP) system is one of the most important improving measures to cope with station blackout accident in the domestic second generation+ 1 000 MWe PWR nuclear power plant. In order to obtain the starting performance of ASP system, the ASP system test facility was constructed based on scaling criteria. The effects of different influencing factors on starting performance of ASP system were obtained. The results show that the secondary-side water inventory of steam generator and operating time of ASP system isolation valve have little influence on starting performance of ASP system. The flow rate of ASP system decreases with the increase of drag coefficient of steam pipeline and backwater pipeline. The flow rate of ASP system is unstable with reciprocating opening of vapor discharge to atmosphere valve (VDA), and it is recovered to stable state when VDA is closed. The peak value of flow rate of ASP system is mainly affected by the initial water volume of heat exchanger tube. The stable natural circulation is established during all the experiments.