Abstract
Mechanistic models of nuclear fuels require development of multi-scale models that provides the necessary microscopic parameters that are usually cannot be determined experimentally. In this work we present the results of atomistic calculations of the surface diffusivity for nanometer bubbles in gamma-uranium that is used as a parameter in the rate-theory approach describing bubble diffusion. The unexpected features of surface diffusion are revealed and the accuracy of the rate-theory approach is estimated.
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