Critical Experiments with Low-Moderated Homogeneous Mixtures of Plutonium and Uranium Oxides Containing 8, 15, and 30 wt% Plutonium

Autor:	E.D. Clayton, S.R. Bierman
Rok vydání:	1976
Předmět:	Materials science Uranium dioxide Analytical chemistry chemistry.chemical_element Uranium Methacrylate Plutonium Nuclear physics chemistry.chemical_compound Nuclear Energy and Engineering chemistry Criticality Homogeneous Slab Polystyrene
Zdroj:	Nuclear Science and Engineering. 61:370-376
ISSN:	1943-748X 0029-5639
DOI:	10.13182/nse76-a26923
Popis:	The results from a series of criticality experiments with three different mixtures of oxides of plutonium and uranium are presented. The fuel mixtures consisted of /sup 235/U-depleted uranium homogenized with approximately 8, 15, and 30 wt percent plutonium and blended, homogeneously, with polystyrene to achieve H:(Pu + U) atomic ratios of approximately 7, 3, and 3, respectively. Critical sizes are given for rectangular parallelepipeds of each of the fuels fully reflected with a methacrylate plastic (Plexiglas). Critical sizes are also given for unreflected parallelepipeds of the 30-wt percent plutonium-enriched fuel mixture. For the 30-wt percent plutonium-enriched mixture, sufficient fuel was available to permit determining that the critical thickness of a fully reflected slab of this material, infinite in two dimensions, was 12.93 + 0.14 cm. Comparisons were made between the critical assemblies and calculational results using ENDF/B-III cross sections and the KENO and DTF-IV computer codes. Wherever comparisons could be made, the DTF-IV and KENO results were within 1 percent of each other; however, some of the comparisons between calculations and experiments differed by 2 to 3 percent in k/sub eff/.
Databáze:	OpenAIRE
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