Abstract
Currently there is controversy surrounding the mechanism of fission-gas release from fuel subjected to transient heating. A recent model (SINGAR) suggests that the release mechanism is principally single-atom migration coupled with thermal resolution of atoms from intragranular bubbles. This contrasts markedly with the previous interpretation of the release in terms of biased gas bubble migration in the presence of a temperature gradient. Here we successfully model the extensive release observed during isothermal annealing of irradiated fuel samples. This is major evidence in favour of the SINGAR model since, in the absence of a temperature gradient, the bubble migration model will predict no release, contrary to observation.
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