Monte Carlo analysis of Pu-H/sub 2/O and UO/sub 2/-PuO/sub 2/-H/sub 2/O critical assemblies with ENDF/B-IV data

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A set of critical experiments, comprising thirteen homogeneous Pu-H/sub 2/O assemblies and twelve UO/sub 2/-PuO/sub 2/ lattices, was analyzed with ENDF/B-IV data and the RCPO1 Monte Carlo program, which modeled the experiments explicitly. Some major data sensitivities were also evaluated. For the Pu-H/sub 2/O assemblies, calculated K/sub eff/ averaged 1.011. The large (2.7%) scatter of K/sub eff/ values for these assemblies was attributed mostly to uncertainties in physical specifications since no clear trends of K/sub eff/ were evident and data sensitivities were insignificant. The UO/sub 2/-PuO/sub 2/ lattices showed just one trend of K/sub eff/, which indicated an overprediction of … continued below

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75 pages

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Hardy, J. Jr. & Ullo, J.J. April 1, 1981.

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  • Main Title: Monte Carlo analysis of Pu-H/sub 2/O and UO/sub 2/-PuO/sub 2/-H/sub 2/O critical assemblies with ENDF/B-IV data
  • Series Title: AWBA Development Program

Description

A set of critical experiments, comprising thirteen homogeneous Pu-H/sub 2/O assemblies and twelve UO/sub 2/-PuO/sub 2/ lattices, was analyzed with ENDF/B-IV data and the RCPO1 Monte Carlo program, which modeled the experiments explicitly. Some major data sensitivities were also evaluated. For the Pu-H/sub 2/O assemblies, calculated K/sub eff/ averaged 1.011. The large (2.7%) scatter of K/sub eff/ values for these assemblies was attributed mostly to uncertainties in physical specifications since no clear trends of K/sub eff/ were evident and data sensitivities were insignificant. The UO/sub 2/-PuO/sub 2/ lattices showed just one trend of K/sub eff/, which indicated an overprediction of U238 capture consistent with that observed for uranium-H/sub 2/O experiments. There was however a approx. 1% discrepancy in calculated K/sub eff/ between the two sets of UO/sub 2/-PuO/sub 2/ lattices studied.

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75 pages

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NTIS, PC A04/MF A01.

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  • April 1, 1981

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  • July 3, 2018, 8:14 a.m.

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Hardy, J. Jr. & Ullo, J.J. Monte Carlo analysis of Pu-H/sub 2/O and UO/sub 2/-PuO/sub 2/-H/sub 2/O critical assemblies with ENDF/B-IV data, report, April 1, 1981; West Mifflin, Pennsylvania. (https://digital.library.unt.edu/ark:/67531/metadc1188358/: accessed September 27, 2023), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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