SPECTRAL SHIFT CONTROL REACTOR BASIC PHYSICS PROGRAM EXPONENTIAL EXPERIMENTS AT ELEVATED TEMPERATURES ON LATTICES MODERATED BY D2O-H2O MIXTURES

摘要

Summarized here are the results of exponential experiments conducted at elevated temperatures on rod lattices of slightly-enriched U02 moderated by D20-H20 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% D20) and a D20-H20 mixture containing 81.5 mole % D20.nThe experimental facility and techniques are described. Material buckling values derived from radial and axial flux measurements are summarized below.