Heat transfer experiment for spray cooling in spent fuel facility

Abstract

If the cooling systems of the spent fuel pool (SFP) is lost, scenarios such as evaporation of pool water, fuel exposure, fuel damage, and environmental release of radioactive materials are possible. As a measure against such a severe accident, SFP has provided portable spray equipment. However, it has been pointed out that the technical knowledge on thermal-hydraulic behavior and fuel damage expected when the SFP water level has lost is not enough. In this study, assuming a severe accident in which the SFP water level dropped abnormally, technical bases were established to evaluate the effectiveness of the spent fuel assembly cooling effect of the spray equipment under these conditions.