Development of the MFPR/R code for characterization of the rim zone and high burnup structure evolution in UO2 fuel pellets

The MFPR/R code designed for mechanistic modelling of irradiated UO2 fuel, was further developed for characterization of the rim zone and high burnup structure (HBS) evolution in UO2 fuel pellets. The application of the MFPR/R semi-empirical criterion for fuel restructuring, related to the dislocati...

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Bibliographic Details
Published in:Journal of nuclear materials 2019-04, Vol.517, p.214-224
Main Authors: Tarasov, V.I., Polovnikov, P.V., Shestak, V.E., Veshchunov, M.S.
Format: Article
Language:English
Subjects:
Coalescence
Coalescing
Coarsening
Data processing
Dislocation
Dislocation density
Evolution
Fuels
Impingement
Modelling
Pellets
Penetration depth
Porosity
Uranium dioxide
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Summary:The MFPR/R code designed for mechanistic modelling of irradiated UO2 fuel, was further developed for characterization of the rim zone and high burnup structure (HBS) evolution in UO2 fuel pellets. The application of the MFPR/R semi-empirical criterion for fuel restructuring, related to the dislocation density threshold, allows calculating the penetration depth of HBS as a function of burnup, in a reasonable agreement with observations. For modelling of the porosity evolution in HBS at the UO2 fuel pellet periphery, the MFPR/R model for coalescence of randomly distributed immobile pores owing to their growth and impingement was further developed and validated. The advanced model considering multiple collisions provides a reasonable consent with experimental data, thus demonstrating the validity of the proposed pore coarsening mechanism in HBS.
ISSN:0022-3115
1873-4820
DOI:10.1016/j.jnucmat.2019.01.055