Determination of Retained Gas in Irradiated Fuel Samples

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    Full cross section samples from water reactor fuel pins are oxidized in molten NaNO3 containing about 10% NaOH and 5% Na2O2. During this oxidation the fission gases Kr and Xe are released. The gas volume is measured, and the gas is analysed by mass spectrometry.

    The generated amount of gas in the samples analysed is calculated from measured burn-up, from measured Xe and Kr isotope ratios and from fission yields of stable Xe and Kr isotopes with low neutron capture cross sections. From the fission gas generated and measured amount of gas retained, the gas retention and release percentage can be found.

    Examples of results are reported. Retained gas plus released gas (measured by puncturing) and the calculated gas generation agreed within 6 percent.
    Original languageEnglish
    Place of PublicationRoskilde, Denmark
    PublisherDanmarks Tekniske Universitet, Risø Nationallaboratoriet for Bæredygtig Energi
    Number of pages19
    ISBN (Print)87-550-0873-9
    Publication statusPublished - 1982

    Bibliographical note

    Paper presented at the EEC Hot Laboratory Committee Meeting, Mol, Belgium, 10-11 June 1982


    • Risø-M-2352
    • Fission yiled
    • Fission products
    • Fission product release
    • Fuel pins
    • Isotope ratio
    • Krypton
    • Krypton isotopes
    • Mass spectroscopy
    • Measuring methods
    • Molten salts
    • Oxidation
    • Post-irradiation examination
    • Radiation chemistry
    • Spent fuels
    • Uranium dioxide
    • Xenon
    • Xenon isotopes


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