Physico-chimie et modélisation du frittage des combustibles d'oxydes d'actinides

Abstract : This report gives a synthesis of the work I have carried out or to which I have numerically contributed to from 1996 up to 2012 in the Department of Plutonium Uranium and minor Actinides in Cadarache CEA Center. Their main goal is the study and the modeling of the sintering process of nuclear fuels which is the unifying thread of this document. Both in order to take into account the physical andchemical features of the actinide bearing oxide material and in order to combine the different transport phenomena leading to sintering, a sub-granular scale model is under development. Extension to a varying chemical composition as well as exchanges with the gaseous phase are foreseen. A simulation on a larger scale (pellet scale) is ongoing in the framework of a PhD thesis. Validation means have been tested with (U,Pu) O2 material on the scale of the pellet (Small Angle Neutron Diffusion), on the scale of powder granules (X-Ray High Resolution Micro-Tomography) and with CeO2 at the 'Institut de Chimie Séparative' in Marcoule on a single crystal scale (Environmental Scanning Electron Microscope). The required microstructure homogeneity for nuclear fuels has led to a campaign of experimental studies about the role of Cr2O3 as a sintering aid. Whole of these studies improve our understanding of fuel sintering and hence leads to an improved mastering of this process.
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Habilitation à diriger des recherches
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Submitted on : Thursday, December 4, 2014 - 10:01:28 AM
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Jacques Léchelle. Physico-chimie et modélisation du frittage des combustibles d'oxydes d'actinides. Matériaux. CEA, CEA/DEN/CAD/DEC/SPUA/LMPC, 2014. ⟨cea-01090740⟩

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