Title: Novel insights in the study of water penetration into polycrystalline UO2 by secondary ion mass spectrometry
Authors: MARCHETTI IlariaBELLONI FabioHIMBERT JeromeCARBOL PaulFANGHAENEL Thomas
Citation: JOURNAL OF NUCLEAR MATERIALS vol. 408 no. 1 p. 54 - 60
Publisher: ELSEVIER SCIENCE BV
Publication Year: 2011
JRC Publication N°: JRC57873
ISSN: 0022-3115
URI: www.elsevier.com/locate/jnucmat
http://publications.jrc.ec.europa.eu/repository/handle/JRC57873
DOI: 10.1016/j.jnucmat.2010.10.065
Type: Articles in Journals
Abstract: 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.
JRC Institute:Institute for Transuranium Elements

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