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• W789039745 abstract "Abstract Spent nuclear fuel generated at nuclear power plants must be safely stored during interim storage periods. A concrete storage cask to safely store spent nuclear fuel should be able to adequately emit the decay heat from the spent nuclear fuel. Moreover, the concrete storage cask must ensure that the temperatures of the spent nuclear fuel assemblies are maintained within the allowable values for normal, off-normal, and accident conditions. Therefore, the concrete storage cask must be designed to have heat removal capabilities with appropriate reliability. However, the thermal conductivity of concrete is not good and the allowable temperature of concrete is lower than that of steel. In this study, a thermal test was performed to evaluate the heat removal performance of the concrete storage cask under development by KORAD (Korea Radioactive Waste Agency), under normal and off-normal conditions. In addition, a thermal test was performed to evaluate the thermal integrity of the concrete under accident conditions. The heat transfer rate to the ambient atmosphere by convective airflow through the passive heat removal system of the concrete storage cask was found to reach 93.5% under normal conditions. Thus, it was confirmed that the passive heat removal system was well designed and worked adequately. In addition, the heat transfer rate to the ambient atmosphere by convective airflow through the passive heat removal system under off-normal conditions was estimated to reach 87.4%. Therefore, it was deduced that the half-blockage of the inlet openings has a relatively small effect on the maximum temperatures and temperature distributions. Moreover, no significant temperature differences were detected with respect to the location of the half-blockage of the inlet openings. This indicated that, the influence of the direction of the half-blockage of the inlet openings on the heat removal performance was minimal. Finally, the maximum temperature of the over-pack inner surface under accident conditions was measured as 103 °C, thus verifying that the thermal integrity of the concrete is adequately maintained under accident conditions." @default.
• W789039745 created "2016-06-24" @default.
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• W789039745 date "2015-11-01" @default.
• W789039745 modified "2023-09-24" @default.
• W789039745 title "Experimental investigation of heat removal performance of a concrete storage cask" @default.
• W789039745 cites W1796743216 @default.
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• W789039745 doi "https://doi.org/10.1016/j.anucene.2015.06.024" @default.
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