Title: Oxygen Stoichiometry Shift of Irradiated LWR-fuels at High Burn-ups: Review of Data and Alternative Interpretation of Recently Published Results
Citation: JOURNAL OF NUCLEAR MATERIALS vol. 375 p. 8-25
Publication Year: 2008
JRC N°: JRC44009
ISSN: 0022-3115
URI: http://www.elsevier.com/locate/jnucmat
DOI: 10.1016/j.jnucmat.2007.10.007
Type: Articles in periodicals and books
Abstract: The available oxygen potential data of LWR-fuels by the EFM-method have been reviewed and compared with thermodynamic data of equivalent simulated fuels and mixed oxide systems, combined with the analysis of lattice parameter data. Up to burn-ups of 70¿ 80 GWd/tM the comparison confirmed traditional predictions anticipating the fuels to remain quasi stoichiometric along irradiation. However, recent predictions of a fuel with average burn-up around 100 GWd/tM becoming definitely hypostoichiometric were not confirmed. At average burn-ups around 80 GWd/tM and above, it is shown that the fuels tend to acquire progressively slightly hyperstoichiometric O/M ratios. The maximum derived O/M ratio for an average burn-up of 100 GWd/tM lies around 2.001 and 2.002. Though slight, the stoichiometry shift may have a measurable accelerating impact on fission gas diffusion and release.
JRC Directorate:Nuclear Safety and Security

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