Novel insights in the study of water penetration into polycrystalline UO2 by secondary ion mass spectrometry
Oxygen and water diffusion in polycrystalline UO2 are key parameters to investigate in order to predict spent fuel behaviour in a final repository in the event of exposure to groundwater. In this work, 18O tracer diffusion is evaluated by means of secondary ion mass spectrometry on a UO2 pellet exposed to 18O-labelled water at room temperature for 3 months. Depth profiling up to 22 µm beneath the pellet surface clearly indicates a combination of oxygen diffusion into the UO2 lattice and water diffusion along grain boundaries, behaving as high diffusivity paths. The relevant coefficients have been estimated around 1.4*10-24 m2 s-1 for lattice diffusion and around 2.3*10-16 m2 s-1 for grain boundary diffusion.
MARCHETTI Ilaria;
BELLONI Fabio;
HIMBERT Jerome;
CARBOL Paul;
FANGHAENEL Thomas;
2011-01-14
ELSEVIER SCIENCE BV
JRC57873
0022-3115,
www.elsevier.com/locate/jnucmat,
https://publications.jrc.ec.europa.eu/repository/handle/JRC57873,
10.1016/j.jnucmat.2010.10.065,
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