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Modélisation multi-échelle du couplage physico-chimie - mécanique du comportement du combustible à haute température des réacteurs à eau sous pression

Abstract : For the study of the Pellet-Cladding Interaction (PCI) in fuel rods, it is necessary to provide a good description of the thermomechanical behaviour of the fuel. During power fluctuations of the fuel, gaseous swelling induced by irradiation is one of the main phenomena to be dealt with. Indeed, fuel is a porous ceramic of UO2 containing several types of cavities and the accumulation of fission products in gaseous form in these cavities causes swelling of the pellet. This gaseous swelling has an influence on the mechanical behaviour of the pellet, in particular in terms of viscoplastic behaviour. To improve the description of this behaviour, it was necessary to develop a micromechanical model taking both into account two phenomena previously studied independently: the transfer of gas between the various cavities and the estimation of mechanical viscoplastic strains of the fuel. This thesis aims at linking these two problems through cavities present in the fuel: mechanics evaluates changes in the volume fraction of cavities according to their pressure and physics evaluates the evolution of the volume fraction of cavities to estimate a better internal pressure. In order to describe a more complex microstructure, a new micromechanical model was developed using a multi-scale approach to describe the viscoplastic behavior of nuclear fuel.
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https://tel.archives-ouvertes.fr/tel-00506540
Contributor : Jerome Julien <>
Submitted on : Wednesday, July 28, 2010 - 10:11:31 AM
Last modification on : Thursday, January 23, 2020 - 6:22:03 PM
Long-term archiving on: : Friday, October 29, 2010 - 10:11:32 AM

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  • HAL Id : tel-00506540, version 1

Citation

Jérôme Julien. Modélisation multi-échelle du couplage physico-chimie - mécanique du comportement du combustible à haute température des réacteurs à eau sous pression. Mécanique [physics.med-ph]. Université de Provence - Aix-Marseille I, 2008. Français. ⟨tel-00506540⟩

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