基于WGOTHIC程序的非能动安全壳冷却系统传热特性分析

Analysis of the Heat Transfer Phenomenon in Passive Containment Cooling System Based on WGOTHIC

本文基于WGOTHIC程序对非能动安全壳冷却系统(Passive Containment Cooling System,简称PCS)原型及其整体性能试验台架进行建模,分析了基准工况和恶劣工况下安全壳内的压力变化和传热特性变化过程。结果表明:恶劣工况下PCS系统的冷却能力受到了一定限制,使安全壳在事故初期的冷却降压速率略有下降,但从长期来看仍可有效实现安全壳的降温降压。事故后安全壳内热阱吸热速率迅速下降,通过安全壳内壁面冷凝吸收的热量比例逐渐增大,最终通过安全壳壳体壁面"冷凝—导热—蒸发"通道载出能量的速率和事故中破口输入能量的速率将达到平衡。

To verify the cooling capacity margin of passive containment cooling system （PCS）, the calcu- lating model of test facility and PCS prototype are established respectively using dedicated containment safety analysis program WGOTHIC. The development of pressure inside containment and change process of heat transfer characteristics in base and severe accident condition were gotten from the calculation. The analysis results show that ： as the PCS appliance is limited during the severe accident condition, the depres-surization rate inside containment decreases slightly in the early accident, however the containment can still be cooled down effectively in the long term. The heat absorption rate of thermal conductor decreases rap-idly after the outer shell cooling water coverage established, but the condensation heat transfer rate inner shell wall increases gradually. Finally, a balance would be made up between the energy carried out by condensation-evaporation at the shell wall and the energy released by loss of coolant accident