Abstract
Equilibrium fission-gas release rates from single crystal U02 specimens were studied at temperatures from 400° to 1300°C and with neutron fluxes from 1 × 1013 to 4 × 1013 neutrons per cm2.second. The behavior of the fission-gas release for different neutron flux levels and temperatures indicates that two processes are occurring. One release method appears to be caused by a disturbance of the specimen surface by fission recoils. A temperature-dependent process dominates the gas release above about 7000C. This high-temperature release, once thought to be by diffusion, is now postulated to be controlled by a trapping process. A first-approach mathematical model is given in which a concentration of traps is assumed to be controlled by fission density, temperature, burnup, and initial structure of the specimen. It is also assumed that the trapped gas has an escape probability which increases with temperature.
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