Heat removal verification tests of full-scale concrete casks under accident conditions

Heat removal verification tests using two kinds of full-scale concrete casks under accident conditions were performed. One is reinforced concrete cask and the other is concrete filled steel cask. From the test results, their safety on heat removal performance under accident conditions was confirmed. Accident conditions for the tests were partial (50%) and complete (100%) blockage of the air inlets. Because the shape of air flow area in the concrete casks are different between two types of the cask, it was found that the change of the temperature distribution and air flow pattern were different for each accident condition.