Rectangular beams of high density single-crystal UO₂ were prepared from large grains of fused UO₂.They were deformed under constant load in four-point bending in hydrogen at temperatures from 1340 to 1420°C. The results appear to fit a creep equation of the form (formula omitted) where e = steady-state creep rate (formula omitted) Q = 118 ± 23 kcal/mole C = constant ; and 3 < n <4 in the regions of stress and temperatures examined. Faint slip lines were observed. / Applied Science, Faculty of / Materials Engineering, Department of / Graduate