Summarized here are the results of exponential experiments conducted at elevated temperatures on rod lattices of slightly-enriched UO2 moderated by D2O-H2O mixtures. The fuel rods, 4%-enriched UO2 swaged in stainless steel, were 0.476-inch OD by 0. 016-inch wall. The non-moderator-to-moderator volume ratio was 1. 006. The two moderator compositions studied were light water {0% DjO) and a D2O-H2O mixture containing 81.5 mole % D2O. The experimental facility and techniques are described. Material buckling values derived from radial and axial flux measurements are summarized below. 0% D2O
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