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Measurements and analysises of lattice parametets in 36-rod PuO$$_{2}$$-UO$$_{2}$$ fuel clusters

Fukumura, Nobuo*; not registered; not registered; not registered; not registered; not registered; Hachiya, Yuki*

Measurements and analysises of lattice parameters have been made by use of the 36-rod PuO$$_{2}$$-UO$$_{2}$$ fuel clusters (0.54w/o PuO$$_{2}$$-UO$$_{2}$$) which are composed of the rods with the same diameters as the ones of Fugen type fuel rods. The nine 36-rod fuel clusters were loaded in the central region of the DCA eore with the square lattice of 25.0cm pitch and the surrounding region was occupied with eighty-eight 1.2w/o enriched UO$$_{2}$$ 28-rod fuel clusters. The experiments have been performed with (0% void)and without (100% void) H$$_{2}$$O coolant in the pressure tube. The lattice parameters such as $$^{238}$$U resonance capture ratio ($$rho$$$$^{28}$$), the epicadmium fission ratio of $$^{235}$$U or $$^{239}$$Pu ($$delta$$$$^{25}$$ or $$delta$$$$^{49}$$), the fast fission ratio of $$^{238}$$U ($$delta$$$$^{28}$$) and the fission ratio of $$^{239}$$Pu to $$^{235}$$U ($$delta$$$$^{49}$$$$_{25}$$) were obtained by the foil activation method using foils of plutonium and enriched, natural and depleted uranium. The analysises have been made by use of the sophisticated cell calculation code WIMS which is used for nuclear design of the commercial FUGEN. The results are shown in the table. Here, indices "cell" represent cell averaged values. It is concluded from these results that the code WIMS understimates the fission reaction rates of $$^{238}$$U, $$^{235}$$U and $$^{239}$$Pu, and capture reaction rates of $$^{238}$$U resonanee.

Language

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Japanese

Report No.

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PNC TN941 82-132

Pages

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54 Pages

Publication Year/Month

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1982/06

Patent information

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PDF

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PNC-TN941-82-132.pdf:1.28MB

Paper URL

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Keywords

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no keyword

Research Facility

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Press Release

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Article of JAEA R&D Review

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Cooperating Institute

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Other institute's report number

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Acecsses

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- Accesses

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