Verification of Thermal Cooling Capacity for a Spent Fuel Pool Expansion in a 1000 MW PWR Nuclear Power Plant

In view of the capacity expansion project of a 1000 MW PWR NPP spent fuel pool, the thermal cooling capacity of the spent fuel pool after expansion is verified by using the Computational Fluid Dynamics（CFD） and theoretical analysis methods. Under the operating cooling condition of at least one of reactor pool and spent fuel pool cooling and processing system（PTR） in the spent fuel pool, the average water temperature of the spent fuel pool meets the corresponding acceptance criteria. The maximum local water temperature and the maximum temperature of the fuel cladding shell are lower than the local water saturation temperature. On the condition of lost two PTR systems, the time of heating the average water temperature to the boiling temperature and the exposure time of the fuel grid are both calculated, which provides a guidance for the operation intervention.