CFD Analysis of Flow Distribution of Reactor Core and Temperature Rise of Coolant in Fuel Assembly for VVER Reactor

Flow field of VVER-1000 reactor core was investigated by using computational fluid dynamics code CFX, and the temperature rise of coolant in hot assembly was calculated. The results show that the maximum value of flow distribution factor is 1.12 and the minimum value is 0.92. The average value of flow distribution factor in hot assembly is 0.97. The temperature rise in hot assembly is higher than current warning limit value ΔT_t under the deviated operation condition. The results can provide reference for setting ΔT_t during the operation of nuclear power plant.