Microstructure of UO2 in a wide range of burnups and temperatures impacts on fission gas release mechanisms

摘要

This report gives a summary of the scanning electron microscope observations of fuel fracture surfaces for a wide range of temperatures and burnups. The results are given in the form of four observation criteria, in a burnup-temperature diagram: fracture mode, bubbles, channels at ternary grain boundaries, metallic precipitates. (authors). 8 figs., 10 refs. (Atomindex citation 26:037806)