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.
Restructuring in high burn-up UO2 fuels: Experimental characterization by electron backscattered diffraction
Note: This paper is part of the Special Topic on Radiation Effects in Materials.
Isabelle Zacharie-Aubrun, Rebecca Dowek, Jean Noirot, Thierry Blay, Martiane Cabié, Myriam Dumont; Restructuring in high burn-up UO2 fuels: Experimental characterization by electron backscattered diffraction. J. Appl. Phys. 21 November 2022; 132 (19): 195903. https://doi.org/10.1063/5.0104865
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