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Advanced Course in Heat Transfer in Nuclear Reactor Safety
September, 1-5, 1980, Dubrovnik, Yugoslavia

DOI: 10.1615/ICHMT.1982.AdvCourHeatTransfNucReactSaf


ISBN Print: 978-0-89116-223-0

5.4 Boiling Fragmentation Studies and Their Relevance to the Initiation and Propagation of FCI's

pages 867-882
DOI: 10.1615/ICHMT.1982.AdvCourHeatTransfNucReactSaf.560
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ABSTRACT

The rapid escalation of FCI's from small triggers, observed experimentally, suggests that mechanisms other than differential velocity fragmentation are operating. We describe small scale experiments with water/tin and Freon 22/ water in which evidence for a boiling fragmentation process has been observed. The basic feature of this process is the rapid growth of submillimetre-scale bubbles. We suggest that turbulent-mixing is produced by the bubble-driven velocity field. The likelihood of this mechanism occurring with Na/UO2 and its implications are briefly considered.

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