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|Title:||Novel insights in the study of water penetration into polycrystalline UO2 by secondary ion mass spectrometry|
|Authors:||MARCHETTI Ilaria; BELLONI Fabio; HIMBERT Jerome; CARBOL Paul; FANGHAENEL Thomas|
|Citation:||JOURNAL OF NUCLEAR MATERIALS vol. 408 no. 1 p. 54 - 60|
|Publisher:||ELSEVIER SCIENCE BV|
|Type:||Articles in periodicals and books|
|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 Directorate:||Nuclear Safety and Security|
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