Local Fission Gas Release and Swelling in Water Reactor Fuel during Slow Power Transients

Mogens Bjerg Mogensen, C.T. Walker, I.L.F. Ray, M. Coquerelle,

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    Gas release and fuel swelling caused by a power increase in a water reactor fuel (burn-up 2.7–4.5% FIMA) is described. At a bump terminal level of about 400 W/cm (local value) gas release was 25–40%. The formation of gas bubbles on grain boundaries and their degree of interlinkage are the two factors that determine the level of fission gas release during a power bump. Release begins when gas bubbles on grain boundaries start o interlink. This occurred at r/r0 ~ 0.75. Release tunnels were fully developed at r/r0 ~ 0.55 with the result that gas release was 60–70% at this position.
    Original languageEnglish
    JournalJournal of Nuclear Materials
    Volume131
    Issue number2-3
    Pages (from-to)162-171
    ISSN0022-3115
    DOIs
    Publication statusPublished - 1985

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