Abstract
A previous paper has discussed the application to stable fission gas release of an enhanced Fick's Law transport process which also includes a so-called drift term arising from gas atom drag by moving dislocations. The new transport law was shown to be effective at describing stable fission gas release from the onset of grain-boundary tunnel interlinkage to the appearance of high burnup fuel restructuring. In the present work this law is applied to the release of unstable fission gases and is shown to be incapable of explaining the observed data. An explanation for this anomaly has been sought in the PIE of dislocations in irradiated fuel. The ultimate rationale focuses on the recognition not only that successfully released unstable gas atoms are created in the surface region of the fuel grain but also that the solute drag mechanism conspires to favour gas atom motion in the depth of the fuel grain rather than the surface.
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