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非能动安全壳冷却系统依靠上升段和下降段密度差驱动形成的自然循环流动排出安全壳内热量。在地下核电厂中,非能动安全壳冷却系统换热器与换热水箱之间的水位差高达180 m,可形成很大的自然循环驱动压头,利于自然循环流动和换热。对非能动安全壳冷却系统的启动过程进行程序计算模拟,发现在系统建立自然循环的过程中,如果换热水箱温度过高或者系统设计不合理,可能不能建立自然循环。同时,流体可能会在上升段出现闪蒸现象,引起两相自然循环流动振荡。
The passive containment cooling system relies on the natural circulation formed by the density difference driving of the ascending section and the descending section to discharge the heat in the containment. In the underground nuclear power plant, the water level difference between the passive containment cooling system heat exchanger and the heat exchange water tank is as high as 180 m, forming a large natural circulation driving pressure head, which is conducive to natural circulation and heat exchange. The program simulation of the startup process of the passive containment cooling system shows that natural circulation may not be established if the temperature of the heat exchange tank is too high or the system design is not reasonable during the natural circulation of the system. At the same time, the fluid may flash in the ascending section, causing two-phase natural circulation to oscillate.