Abstract

Melting of the terminal debris bed at the bottom of a CANDU 6 calandria vessel during a severe accident is studied using a three-dimensional transient finite element analysis. Settling of the debris is modelled, as are the effects of changing temperature and porosity on debris material properties. The time and magnitude of maximum heat rejection from the debris bed, and the maximum mass of molten debris, are calculated as functions of the accident timing. Results are compared with those from the MAAP-CANDU severe accident code.

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