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J. Noirot,I. Zacharie-Aubrun,T. Blay 한국원자력학회 2018 Nuclear Engineering and Technology Vol.50 No.2
Focused ion beamescanning electron microscope and electron backscattered diffraction examinationswere conducted in the center of a 73 GWd/tU UO2 fuel. They showed the formation of subdomains withinthe initial grains. The local crystal orientations in these domains were close to that of the original grain. Most of the fission gas bubbles were located on the boundaries. Their shapes were far from spherical andfar from lenticular. No interlinked bubble network was found. These observations shed light on previousunexplained observations. They plead for a revision of the classical description of fission gas releasemechanisms for the center of high burn-up UO2. Yet, complementary detailed observations are needed tobetter understand the mechanisms involved