针对基于回路热管技术的非能动安全壳冷却系统开展瞬态特性试验,根据试验数据分析系统在液柱启动方式下自然循环流量、安全壳压力、流动不稳定性等过渡特性。结果表明:基于回路热管技术的非能动安全壳冷却系统具有良好的启动特性,可实现事故工况下安全壳内热量的顺利导出,且能够在启动阶段实现安全壳压力的快速下降。系统具有流动不稳定性工况区域,其影响因素与冷却水箱温度、安全壳压力及系统输入功率有关,流动不稳定性未对安全壳内压力趋势造成明显影响。 A transient test of passive containment cooling system based on loop heat pipe technology was carried out. Based on the experimental data, the transient characteristics of natural circulation flow, containment pressure and flow instability were analyzed. The results show that the passive containment cooling system based on the loop heat pipe technology has a good start-up characteristic, can successfully derive the heat in the containment under accident conditions, and can rapidly reduce the pressure in the containment during the start-up phase. The system has a working area with unstable flow conditions, and its influencing factors are related to the temperature of the cooling water tank, the pressure of the containment and the input power of the system. The instability of flow has no obvious effect on the pressure trend in the containment.