Title: Matrix Swelling Rate and Cavity Volume Balance of UO2 Fuels at High Burn-Up
Citation: JOURNAL OF NUCLEAR MATERIALS no. 346 p. 131-144
Publication Year: 2005
JRC N°: JRC30230
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC30230
Type: Articles in periodicals and books
Abstract: The low temperature matrix swelling of UO2-fuels was analysed as a function of burn-up, taking into account changes in the fuel density, porosity and retained Xe-concentration as measured by EPMA. The combined evaluation of these data leads to the conclusion that at average pellet burn-ups ≥ 60 GWd/tM the total matrix swelling rate is gradually reduced from ~1 %/10 GWd/tM to ~0.3 %/10 GWd/tM; the latter value being reached at an average burn-up above 110 GWd/tM. The decrease in the swelling rate is due to the progressive depletion of fission gas in the fuel matrix by thermal and athermal processes, such that at very high burn-up the matrix swelling becomes dominated by the precipitation of solid fission products. Owing to volume conservation, the volume occupied by the depleted gas is replaced by porosity.
JRC Directorate:Nuclear Safety and Security

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