A model for trapping and re-solution regarding intra-granular bubbles in UO2, linked to atomic-scale simulations

Vergani, M.; Cooper, M. W. D.; Noirot, Laurence

doi:10.1016/j.jnucmat.2024.155562

A model for trapping and re-solution regarding intra-granular bubbles in UO₂, linked to atomic-scale simulations

Journal Article · Tue Dec 10 00:00:00 EST 2024 · Journal of Nuclear Materials

DOI:https://doi.org/10.1016/j.jnucmat.2024.155562· OSTI ID:2481567

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CEA, DES, IRESNE, DEC, Saint Paul Lez Durance (France)
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

In the literature, a clear definition of the irradiation re-solution frequency of gas from bubbles in the UO₂ fuel is absent. Moreover, for intra-granular bubbles, a detailed calculation of the cumulated displaced gas quantities in function of the distance from the radius of the bubble after a re-solution event has never been published. The assessment of these two elements is very useful if we want to increase the adherence of fission gas release codes to our present knowledge of the behavior of fission gases. Hence, we suggest to link the definition of the re-solution frequency to atomic-scale simulations. Furthermore, we present the cumulated displaced gas quantities obtained from Molecular Dynamics calculations, from which we have derived a re-solution profile that can be exploited to better consider the irradiation re-solution phenomenon inside Fission Gas Release codes. On top of that, we have built a new trapping/re-solution model for intra-granular bubbles linked to Molecular Dynamics simulations that can be easily incorporated into Fission Gas Release codes. In conclusion, we also check that the model is properly built through the comparison of the new model against a reference.

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This content will become publicly available on Wed Dec 10 00:00:00 EST 2025

Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Office of Nuclear Energy (NE); USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 2481567

Report Number(s):: LA-UR-23-32630

Journal Information:: Journal of Nuclear Materials, Vol. 605; ISSN 0022-3115

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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A model for trapping and re-solution regarding intra-granular bubbles in UO₂, linked to atomic-scale simulations