Analysis of a gross core melt-down accident In a Gas cooled Breeder Reactor

摘要

The present paper presents a first study of the gross core melt-down In a Gas cooled Bleeder Reactor with standing core. The migration process of the debris is analysed and the various phenomena which might occur during melting [compaction, recriticallty, reactivity insertion, energy release] are assessed.nThe analysis has shown that, in the most pessimistic conditions, reactivity ramps and energy releases would not exceed 3 $/sec and 8000 MJ respectively. No significant fuel vaporization is anticipated and the Prestressed Concrete Vessel Structure integrity would not be endangered. In terms of fast reactor safety, the accident can therefore be considered as rather mild.