非能动安全壳冷却系统配水管路进气问题研究

Analysis on Air Inlet Problem of Passive Containment Cooling Piping

为研究非能动安全壳冷却系统(PCS)配水系统的水力特性,以及分析配水管路中可能出现的进气问题,采用FLOWMASTER软件,建立PCS一维水力模型,计算非能动安全壳冷却水箱(PCCWST)向安全壳重力供水过程中的流量变化;并利用FLUENT软件对配水过程进行二维数值模拟,分析配水管路进气对冷却水流量的影响。研究表明,部分立管裸露后,空气将被吸入配水管路,影响配水稳定性;进气后实际的配水流量相对于未考虑进气的配水流量有略微下降。

For analyzing the hydraulic performance and air inlet problem of passive containment cooling system （PCS）, the software FLOWMASTER is used to establish an one-dimensional hydraulic model, and using it, the PCCWST water supply flow rate for 72 hours after accident is calculated; The two-dimensional FLUENT model is used to analyze the air inlet phenomenon. The result indicates that the air will be drawn to the water supply piping after the highest vertical pipe uncovered by water, which creates disadvantage to the water supply piping. And the actual cooling water supply flow rate is slightly less than the flow rate without considering the air inlet.