Abstract
Sodium boiling experiments have been performed under natural convection conditions in an electrically heated 37-pin bundle. The pin power was in the range of the decay power of an LMFBR. In the tests which aimed at approaching the limits of cooling of a pin bundle three aspects have been investigated: (1) increase of the flow resistance in the cold leg of the natural convection loop, (2) pin powers exceeding the decay power, and (3) the maximum power which can be removed continuously from a grid spaced bundle with totally blocked inlet. The results related to items one and two reveal the large safety margin which exists between nominal operation conditions in the case of emergency cooling and cooling failure. Theoretical work concentrates on flow stability and on the predictions of a model based on counter-current vapour-liquid flow.
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