Study of the Passive Containment Cooling System Behavior in Severe Accident
The passive containment cooling system(PCCS)can effectively remove the heat in the containment and maintain the pressure and temperature in case of accident,thus ensuring the containment integrity.PCCS can introduce the gaseous flow and stratification of containment.At the same time,the increasing temperature of PCCS water tank and the different state of containment will also change the heat transfer power of PCCS.In this paper,the integrated severe accident analysis code ASTEC(Accident Source Term Evaluation Code)is used to establish a Gen Ⅲ PWR model with PCCS,and the simulation result of PCCS is compared with unit experiment:In large break loss of coolant accident,the containment pressure reaches 0.7 MPa in 3 days without PCCS,while that is 0.3 MPa with PCCS.Meanwhile,PCCS heat transfer power decreases with the increasing temperature of PCCS water tank,and reaches the lowest point when the water tank is saturated.PCCS power rises again with the increasing containment temperature.In the whole process,PCCS heat transfer power can be divided into high power stage,low power stage and saturation stage.The stage conversion mainly depends on the water temperature of the PCCS tank.Increasing the water capacity can delay the arrival of the low power stage and the saturation stage.
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