Safety Analysis of NPP Spent Fuel Pit When Losing of Final Heat Trap

The equipment cooling water used in primary circuit loop and spent fuel system is provided by seawater cooler in nuclear power station.A hypothesis is the seawater cooler quit operation as certain accidents occurred.By employing heat balance equation,we have calculated and analyzed safety of the spent fuel pit and possibility of cooling other important primary circuit loop user.Our results show that the spent fuel pit operates safely at various situations in this paper.Except one condition,cooling water in the spent fuel pit is available to cool other equipments.