STP306

    Study of Factors Controlling the Release of Xenon-133 from Bulk UO2

    Published: Jan 1962


      Format Pages Price  
    PDF (280K) 14 $25   ADD TO CART
    Complete Source PDF (6.3M) 14 $62   ADD TO CART


    Abstract

    The postirradiation anneal technique was used to determine the release rate of xenon-133 from 95 per cent dense UO2 pellets between 1000 and 2000 C. The information was required for design of the Experimental Gas-Cooled Reactor (EGCR) fuel elements.

    Release rate measurements indicated that below the sintering temperature an initial rapid release of xenon was followed by a slower diffusion-controlled release. The release rate parameter, D′ (where D′ = D/a2), ranges between 10−10 and 10−14 per sec at 1400 C. These data are related to the total surface area of the pellet by the equation: log D1400 c (sec−1) = −14.0 + 2 log S.A. (sq cm per g) …….. (1) Below approximately 1600 C, the rate of release can be explained in terms of the equivalent sphere model for fission-gas release. Above approximately 1600 C, the rate of release is higher than would be predicted on the basis of diffusion.

    The release rate data have been compared with the release rates obtained in-pile. Results showed that the release rate was independent of burnup up to 16,400 Mw days per metric ton of UO2.


    Author Information:

    Toner, DF
    Metallurgy Division, Oak Ridge National Laboratory, Oak Ridge, Tenn.

    Scott, JL
    Metallurgy Division, Oak Ridge National Laboratory, Oak Ridge, Tenn.


    Paper ID: STP44387S

    Committee/Subcommittee: E10.07

    DOI: 10.1520/STP44387S


    CrossRef ASTM International is a member of CrossRef.