Abstract
ABSTRACT The objective of this study is to evaluate nonuniformity effect relevant to criticality safety evaluation by means of the flattened principle of fuel importance distribution. We proposed a novel approach using an MVP3.0 perturbation function with JENDL-4.0 and then built a tool to calculate the nonuniformity effect. The tool estimated an optimum fuel distribution that corresponding to the highest multiplication factor in a homogeneity model of UO2–H2O slurry. Consequently, nonuniformity effects specified by the reactivity of a multiplication factor were as much as 0.5 to 5.6%dk/k. Further, preliminary evaluations of heterogeneity effects on optimum fuel distributions were computed using statistical geometry model incorporated in MVP3.0 and then heterogeneity effects observed in optimum fuel distributions also reached 2.3%dk/k at the maximum in multiplication factor. Thus, the effects of both nonuniformity and heterogeneity should be properly taken into account in criticality evaluations.
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