Modeling high burnup structure in oxide fuels for application to fuel performance codes. Part II: Porosity evolution
We propose a model describing the high burnup structure inter-granular porosity evolution under irradiation. This evolution of the porosity collecting the gas diffusing from the grains is accounted for by exploiting a second-order Fokker-Planck expansion of the cluster-dynamics master equations governing the problem. It considers nucleation of pores, gas absorption due to the diffusional flow from the grains, size-dependent re-solution of pores due to their interactions with fission fragments, vacancy absorption, and pores coalescence. Model predictions on xenon local retention, matrix fuel swelling, and porosity evolution are compared to experimental data and to models available in fuel performance codes.
BARANI Tommaso;
PIZZOCRI Davide;
CAPPIA Fabiola;
PASTORE Giovanni;
LUZZI Lelio;
VAN UFFELEN Paul;
2022-03-14
ELSEVIER
JRC126155
0022-3115 (online),
https://www.sciencedirect.com/science/article/pii/S0022311522001234,
https://publications.jrc.ec.europa.eu/repository/handle/JRC126155,
10.1016/j.jnucmat.2022.153627 (online),
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