Analysis of Complete Loss of Forced Flow Accident in China Super-Critical Water Reactor

China supercritical water reactor（CRS1000） was developed by NPIC,which has pressure vessel,double flow pass core,and directly cycle loop.As these characteristics,loss of feed water or loss of offsite power will cause the complete loss of forced flow accident,and the first pass core will encounter flow reversal course during the accident,which make the LOFA（Loss Of forced Flow Accident） become the more serious accident in CRS1000.The CRS1000 system model was created by APROS,and LOFA was analyzed by this model.The result shows that,during the short time of LOFA,the operation of HFT（High pressure Feed water Tank） will mitigate the accident,and in long time,the PRHR（Passive Residual Heat Removal system） will function and make the core at the safety condition.