%AOgino, Teruhisa
%ANaito, Yoshitaka [Japan Atomic Energy Research Inst., Tokai, Ibaraki (Japan). Tokai Research Establishment]
%D1991
%I; Japan Atomic Energy Research Inst., Tokyo (Japan)
%J
%K22 GENERAL STUDIES OF NUCLEAR REACTORS, 11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS, NUCLEAR FUELS, MULTIPLICATION FACTORS, DENSITY, CRITICALITY, REACTOR SAFETY, URANIUM DIOXIDE, NEUTRON REFLECTORS, PLUTONIUM DIOXIDE, CRITICAL MASS, NEUTRON LEAKAGE, URANIUM 235, PLUTONIUM 239, 220300, 050700, FUEL ELEMENTS, FUELS PRODUCTION AND PROPERTIES
%PMedium: X; Size: 30 p.
%TEffect of fuel density on neutron multiplication factor
%XFrom the nuclear criticality safety point of view, a case study has been carried out to investigate effect of uranium dioxide density on the neutron multiplication factor. The neutron multiplication factors k{sub eff}`s are predicted to increase as fuel density increases with fuel mass unchanged. In this case, the fuel volume decreases to increase its geometrical buckling B{sub g}{sup 2}. On the other hand, the neutron migration area M{sup 2} decrease more greatly so that the neutron leakage factor M{sup 2}B{sub g}{sup 2} decreases to result in the greater K{sub eff} calculated. As a conclusion, it is recommended that criticality safety of nuclear fuel with the same isotopic composition should be evaluated assuming the highest fuel density considered in the facility. This conclusion can be shown not to be influenced by difference of fuel materials or reflection conditions, and applicable not only for a single unit system but also for an interacting one. (author).
%0Technical Report
Japan Other: ON: DE92768126; TRN: JP9112204 JPN Japanese