Journal
JOURNAL OF NUCLEAR MATERIALS
Volume 551, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jnucmat.2021.152942
Keywords
Uranium dioxide; Xenon; Bubbles; Diffusion; Gas concentration; Molecular dynamics simulation
Funding
- Russian Foundation for Basic Research [18-08-01495-a]
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In this study, molecular dynamics modeling revealed a new diffusion mechanism for xenon nanobubbles in UO2, which could potentially explain the contradictory data on bubble diffusion and fission gas release rate in UO2.
Molecular dynamics modeling of diffusion of xenon nanobubbles in UO2 is carried out in this work in a wide range of gas concentrations. For small overpressurized nanobubbles emitted interstitials gather in a cluster near the bubble that significantly accelerates bubble diffusion and lowers its activation energy. This new diffusion mechanism could be a way towards an explanation of contradictory data for UO2 on bubble diffusivity and fission gas release rate. (C) 2021 Elsevier B.V. All rights reserved.
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