Comparison of Experimental Database of SPARC and PANDA on Stratification Erosion for Hydrogen Risk Assessment

Hydrogen combustion can threaten the integrity of the containment building in a severe accident. Dynamic and thermal loads produced by hydrogen explosion can highly influence the containment structure. An amount of hydrogen can be generated by the core degradation, and it can then be released into the containment atmosphere. In the containment dome, hydrogen gas can be stratified by its low density. Hydrogen distribution will be changed by the complex physical phenomena such as diffusion, turbulent flow, and heat transfer during accident process. It is necessary to understand the erosion mechanism of stratification of a light gas for the assessment of hydrogen risk in a severe accident. This study compares the stratification behavior of the SPARC test cases with that of the PANDA test cases in a different scale. This study compared the stratification behavior of the SPARC test with that of the PANDA test in a different scale. The erosion rates of the SPARC test cases are faster than those of the PANDA test cases. In the future, we will consider the scale effect to make a general correlation for stratification behavior, and include the other test cases of THAI and MISTRA in our experimental database.