Experimental and Theoretical Studies of Heavy-Water Homogeneous Two-Region System

概要

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A series of critical experiments and theoretical analyses has been made on two-region systems in which a heavy water solution of uranyl sulfate with 235U enrichment of about 20% is surrounded by heavy water, poisoned with B or mixed with ThO2. D-to-235U atomic ratios in the core solutions ranged 4, 500-1, 000, depending on the core diameter and the blanket oncentration. The theoretical effective multiplication factor is decreased by treating the leakage of fast neutrons from the core rigorously, and is increased by using spatial-dependent effective cross sections. These treatments are justified by the agreement found between the calculated and measured values for the Cd ratio and the thermal flux distribution. The disagreement seen in the effective multiplication factor between the theoretical and experimental values may be attributed to uncertainty in the resonance integral of 235U. The discrepancy in the effective multiplication factors does not exceed 1%, when the accepted value of νIf-Ia is reduced to a smaller value.
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