Etude des défauts étendus induits par irradiation dans UO2 par microscopie électronique en transmission

Abstract : During in-reactor irradiation, several phenomena take place in the uranium dioxide fuel: fission gas bubbles and extended defects (dislocation loops and lines) generation, doping by fission products, etc. Fission gas release is an important nuclear safety issue and represent, among others, a limiting factor for the fuel lifetime in reactors. It has been shown experimentally that the extended defects are preferential growth sites for fission gas bubbles. Hence, the study of extended defects created under irradiation is a significant step to better understand the fuel behavior. The aims of this study are to determine the extended defect characteristics (Burgers vectors, habit planes, interstitial or vacancy nature), their evolution mechanisms and the effect of the different irradiation parameters, such as fluence, temperature and exogenous atoms, on the evolution kinetics. To do that, separated-effects studies have been performed using ion irradiations/implantations (JANNuS facilities in Orsay and in Saclay) followed by in situ TEM characterizations (CEMES, JANNuS Orsay), XRD and Raman spectroscopy measurements. Finally, the characterization of fuel irradiated in reactor performed at JRC-ITU, revealed that extended defects are very much closed to those induced by ion irradiations, in terms of density and characteristics.
Keywords : MET Dislocations
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Claire Onofri. Etude des défauts étendus induits par irradiation dans UO2 par microscopie électronique en transmission. Physique Nucléaire Expérimentale [nucl-ex]. Université Paul Sabatier - Toulouse III, 2016. Français. ⟨NNT : 2016TOU30183⟩. ⟨tel-01620533⟩

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