Abstract
A self-heating pool of corium may form at the bottom of a CANDU calandria during a postulated severe accident. Computational fluid dynamics has been used to model natural convection in such a pool. The split in heat flow to the top, end shield, and bottom surfaces of the pool and the angular distribution of heat flux toward the main shell were calculated. The results indicate that about half of the heat flow occurs through the pool’s top surface. The influence of corium thermophysical properties was calculated to be minor.
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