Measurement of local power peaking factors in heavy-water moderated plutonium lattices.
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概要
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Local power peaking factors (LPF) in the heavy-water moderated plutonium lattices were measured by a new method of r-scanning of fuel pins using the calculated power correction factor of which accuracy was evaluated with the aid of foil activation method. Accuracy in measurement of the LPF was evaluated to be within 1%. <BR>By this measurement, behaviors of the LPF have been made clear concerning the dif-ferences in fuel materials, coolant materials and arrangement in fuel enrichments. Depres-sion of the thermal power in the fuel cluster makes LPF in the plutonium fuel lattice larger than in the uranium lattice. This tendency is more remarkable in air coolant lattice than in H<SUB>2</SUB>O coolant lattice. The value of LPF for the plutonium fuel cluster of different enrich-ments is smaller than that of a uniformly enriched fuel cluster. The reduction of LPF is smaller in H<SUB>2</SUB>O coolant than in air coolant lattice.<BR>The values of LPF by WIMS-D code based on the transport theory and by METHUSE-LAH-II code based on the diffusion theory are in agreement with the measured ones, within 1.5 and 2.4% respectively.
- 一般社団法人 日本原子力学会の論文