Volatilization of urania in steam at elevated temperatures

Kenichi Hashizume, Wei E. Wang, Donald R. Olander

    Research output: Contribution to journalArticle

    4 Citations (Scopus)

    Abstract

    The volatilization rates of urania in pure steam and in mixtures of steam and argon, steam and helium, and in steam/Ar/H2 were measured in a thermogravimetric apparatus at atmospheric pressure and temperatures from 1250 °C to 1600 °C. The objective was to clarify the kinetics and mechanism of the volatilization process and to assess the validity of existing thermodynamic data that is needed to interpret the kinetic data. The mass transfer characteristics of the system were determined independently by measuring the evaporation rates of metals of well-known vapor pressures. The measurements of urania volatilization show that the rate-controlling process is gas-phase mass transfer of uranium-bearing species such as UO3. Analysis of the volatilization data also suggests that the calculated UO3 vapor pressures are somewhat in error at the lower temperatures in the range tested.

    Original languageEnglish
    Pages (from-to)277-286
    Number of pages10
    JournalJournal of Nuclear Materials
    Volume275
    Issue number3
    DOIs
    Publication statusPublished - Nov 1999

    All Science Journal Classification (ASJC) codes

    • Nuclear and High Energy Physics
    • Materials Science(all)
    • Nuclear Energy and Engineering

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