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Restructuring in high burn-up UO2 fuels: Experimental characterization by electron backscattered diffraction

Article dans une revue avec comité de lecture
Author
ZACHARIE-AUBRUN, Isabelle
92792 CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) [CEA-DES (ex-DEN)]
DOWEK, Rebecca
92792 CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) [CEA-DES (ex-DEN)]
199957 Institut des Matériaux, de Microélectronique et des Nanosciences de Provence [IM2NP]
NOIROT, Jean
92792 CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) [CEA-DES (ex-DEN)]
BLAY, Thierry
92792 CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) [CEA-DES (ex-DEN)]
CABIÉ, Martiane
1903 Fédération des Sciences Chimiques de Marseille [FSCM]
163804 Centre Pluridisciplinaire de Microscopie Electronique et de Microanalyse [AMU CP2M]
ccDUMONT, Myriam
211915 Mechanics surfaces and materials processing [MSMP]

URI
http://hdl.handle.net/10985/23008
DOI
10.1063/5.0104865
Date
2022-11
Journal
Journal of Applied Physics

Abstract

This paper discusses the use of electron backscattered diffraction to characterize restructuring in a set of UO2 samples, irradiated in a pressurized water reactor at a burn-up between 35 and 73 GWd/tU, including standard UO2 samples and Cr-doped UO2 samples, to provide a better understanding of restructuring occurring both on the periphery and in the center of high-burn-up pellets. The formation of a high burn-up structure on the periphery of high burn-up UO2 was confirmed in our experiment. We found restructuring associated with bubble formation of all the samples in the central area, with higher irradiation temperatures when the burn-up exceeded 61 GWd/tU, regardless of their initial microstructure. This restructuring tended to progress with the increasing burn-up and to sub-divide the initial grains into sub-grains, with orientations close to that of the parent grains. Radial changes and differences between these samples showed that the burn-up and the temperature were not the only relevant parameters involved in restructuring.

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