Abstract
This paper presents the results of falling film rewetting experiments on two types of irradiated fuel pin and on a complementary range of tubes and heaters. Preliminary measurements of rewetting rate in bottom flooding are presented and a brief comparison is made between falling film and bottom flooding rewetting, including the effects of surface finish. It is demonstrated that fuel pin rewetting behaviour is broadly consistent with that for tubes and heaters and that there are no large systematic effects of irradiation. Surface finish is shown to have an important influence on the falling film rewetting rate and could have influenced the fuel pin behaviour. The preliminary findings for bottom flooding are that there are smaller differences between various heaters than for falling film, and surface finish does not significantly change rewetting behaviour. It is shown that subcooling local to the quench front is an important parameter in rewetting, and can be used as a basis for correlating data. This is in agreement with recent ideas.
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