Abstract
The migration velocity of a closed lenticular pore in hyperstoichiometric mixed oxide fuel has been calculated, and the U/Pu ratio of the solid near the moving pore has been determined. Pore migration in mixed oxides differs from the analogous process in pure stoichiometric urania in that the composition as well as the temperature of the two faces of the pore are different. It was found that pore migration is not as effective a mechanism of actinide redistribution as vapor transport along cracks. The velocity of the pores in (U 0,8Pu 0,2) O 2 + x is ∼3 1 2 times faster than that in pure UO 2.
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