Abstract
Abstract A major concern following a meltdown accident in an LMFBR is the possibility of secondary criticality. In this paper an approximate method is presented for determining criticality as a function of pool depth, geometry and reflectivity of the surrounding material. Using this method, ramp rates are determined for the case of a subcritical pool being filled by core debris falling from above. It is shown that in addition to the very large ramps which are normally considered, several configurations lead to much smaller ramps, which should also be considered in subsequent safety analyses.
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