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Etude et Modélisation du Comportement sous Irradiation de l'Hélium dans le Dioxyde d'Uranium

Guillaume Martin 1
1 LM2C - Laboratoire de Modélisation Multi-échelles des Combustibles
SESC - Service d'Etudes de Simulation du Comportement du combustibles : DEN/DEC/SESC
Abstract : Large quantities of helium are produced from α-decay of actinides in nuclear fuels during its in-pile operating and its storage. It is important to understand the behaviour of helium in these matrix in order to well simulate the evolution and the resistance of the fuel element.
During this thesis, we have used nuclear reaction analyses (NRA) to follow the evolution of the helium implanted in polycristalline and monocristalline uranium dioxide (UO2). An experimental rig was developed to follow the on-line helium release in UO2 and the evolution of 3He profiles as a function of annealing temperature. An automated procedure taking into account the evolution of the depth resolution was developed. Analyses performed with a nuclear microprobe allowed to characterise the spatial distribution of helium at the grain scale and to study the influence of the sample microstructure on the helium migration.
This work put into evidence the particular role of grain boundaries and irradiation defects in the helium release process. The analyse of experimental results with a diffusion model corroborates these interpretations. It allowed to determine quantitatively physical properties that characterise the helium behaviour in uranium dioxide (diffusion cœfficient, activation energy...).
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Contributor : Guillaume Martin <>
Submitted on : Monday, February 4, 2008 - 11:24:23 AM
Last modification on : Wednesday, March 3, 2021 - 3:32:02 PM
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  • HAL Id : tel-00224864, version 2

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Guillaume Martin. Etude et Modélisation du Comportement sous Irradiation de l'Hélium dans le Dioxyde d'Uranium. Matériaux. Université d'Orléans, 2007. Français. ⟨tel-00224864v2⟩

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