Journal
JOURNAL OF NUCLEAR MATERIALS
Volume 376, Issue 2, Pages 174-180Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jnucmat.2008.01.026
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An advanced model for intragranular bubble diffusivity in irradiated UO2 fuel is developed. Three various (surface, volume and gas-phase) mechanisms for the gas-filled bubbles diffusivity are reconsidered. It is shown that the bubble mobility by the volume diffusion mechanism can be strongly enhanced under irradiation conditions. Influence of the two-phase interface kinetics at a bubble surface on the volume diffusion, evaporation/condensation and surface migration mechanisms that can strongly suppress diffusivity of small nanometre bubbles, is additionally studied using a non-linear adsorption law derived for the van-der-Waals gas in the bubbles, The improved model is implemented in the MFPR code and validated against measurements of the small bubbles mobility. (C) 2008 Elsevier B.V. All rights reserved.
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