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

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

B. O. Wey
Central Electricity Generating Board, Performance & Safety Division, Berkeley Nuclear Laboratories, Berkeley, Gloucestershire, GL13 9PB UK

R. W. Hall
Central Electricity Generating Board, Performance & Safety Division, Berkeley Nuclear Laboratories, Berkeley, Gloucestershire, GL13 9PB UK

S. J. Board
Central Electricity Generating Board, Performance & Safety Division, Berkeley Nuclear Laboratories, Berkeley, Gloucestershire, GL13 9PB UK

M. Baines
Central Electricity Generating Board, Performance & Safety Division, Berkeley Nuclear Laboratories, Berkeley, Gloucestershire, GL13 9PB UK

Аннотация

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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