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Spectral Shift Control Reactor Basic Physics Program: Measurement and Analysis of Uniform Lattices of Slightly Enriched UO2 Moderated by D2O-H2O Mixtures

Technical Report ·
DOI:https://doi.org/10.2172/4122783· OSTI ID:4122783
This report summarizes the experimental results and theoretical interpretation of a series of twenty uniform lattice critical experiments in which the neutron spectrum is varied over a fairly broad range. Two types of fuel rods were studied: 4.02%-enriched UO2 in stainless steel tubes and 2.46%-enriched UO2 in aluminum tubes. Lattice nonmoderator-to-moderator volume ratios ranged from 0.65 to 1.2. The moderators were mixtures of light and heavy water ranging in composition from zero to 77% D2O, with and without boric acid. Measurements A include critical size and composition, ∂p/∂h, buckling and reflector savings, thermal disadvantage factor, and cadmium ratios of U235 and U238. Theoretical methods used to analyze the data are given, and results are compared.
Research Organization:
Babcock &Wilcox Co., Lynchburg, VA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA), Nuclear Criticality Safety Program (NCSP); US Atomic Energy Commission (AEC)
NSA Number:
NSA-18-004786
OSTI ID:
4122783
Report Number(s):
BAW-1273
Country of Publication:
United States
Language:
English