| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1569056 | Journal of Nuclear Materials | 2008 | 7 Pages |
Abstract
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.
Related Topics
Physical Sciences and Engineering
Energy
Nuclear Energy and Engineering
Authors
M.S. Veshchunov, V.E. Shestak,