Study on Start-up Characteristics of Passive Containment Cooling System for Underground Nuclear Power Plant
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摘要: 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。Abstract: Passive containment cooling system（PCCS） is used to remove the heat in the containment. The mechanism is the natural circulation driven by the density difference between the downward-pipe and the upward-pipe. In the underground nuclear power plant, the difference of water level between heat exchanger and tank is 180 m, which leads to large pressure head to increase the capability of nature circulation. In this paper, the start-up process of PCCS is studied. It is found that the nature circulation may be not established if the initial temperature of the heat-removal tank is too high or the system layout is not reasonable. Meanwhile, flash distillation may occur in the backward of upward-pipe, resulting in the natural circulation oscillation and excurse.
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