Evaluation of flooded 3 x3x3 arrays of plutonium metal

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In the early 1980`s, thirteen experiments using plutonium metal cylinders were performed at the Rocky Flats Critical Mass Laboratory. The experimental method consisted of flooding a 3 x3 x3 array with water until criticality was achieved. Ten of the thirteen experiments went critical while the other three remained subcritical upon full reflection. This paper evaluates these experiments to develop benchmark descriptions for validation of computational tools used by criticality safety specialists. Six of the ten critical experiments were found acceptable as benchmark experiments. Sensitivity studies were performed to find the effect of experimental limits and uncertainties on the k{sub eff} ... continued below

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12 p.

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Pitts, M.; Rahnema, F. & Williamson, T.G. September 1, 1997.

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  • Pitts, M.
  • Rahnema, F. Georgia Institute of Technology, Atlanta, GA (United States). George Woodruff School of Mechanical Engineering
  • Williamson, T.G. Westinghouse Savannah River Company, Aiken, SC (United States)

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Description

In the early 1980`s, thirteen experiments using plutonium metal cylinders were performed at the Rocky Flats Critical Mass Laboratory. The experimental method consisted of flooding a 3 x3 x3 array with water until criticality was achieved. Ten of the thirteen experiments went critical while the other three remained subcritical upon full reflection. This paper evaluates these experiments to develop benchmark descriptions for validation of computational tools used by criticality safety specialists. Six of the ten critical experiments were found acceptable as benchmark experiments. Sensitivity studies were performed to find the effect of experimental limits and uncertainties on the k{sub eff} value. Analysis of the experiments was performed by MCNP with continuous energy ENDF/B-V cross section data. K{sub eff} values for all benchmark experiments were computed using MCNP with ENDF/B-V data, KENO-Va with Hansen Roach cross section, and KENO-Va with 27-group ENDF/B-IV cross sections. Although these experiments were flooded, KENO-Va calculations show that these were, in fact, fast systems. 3 refs., 1 fig., 7 tabs.

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12 p.

Notes

INIS; OSTI as DE97008647

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  • Joint international conference on mathematical methods and supercomputing in nuclear applications, Saratoga Springs, NY (United States), 6-10 Oct 1997

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  • Other: DE97008647
  • Report No.: WSRC-MS--97-0315
  • Report No.: CONF-971005--12
  • Grant Number: AC09-89SR18035
  • Office of Scientific & Technical Information Report Number: 522722
  • Archival Resource Key: ark:/67531/metadc689551

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  • September 1, 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • Feb. 9, 2016, 8:28 p.m.

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Pitts, M.; Rahnema, F. & Williamson, T.G. Evaluation of flooded 3 x3x3 arrays of plutonium metal, article, September 1, 1997; Aiken, South Carolina. (digital.library.unt.edu/ark:/67531/metadc689551/: accessed September 26, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.