Nuclear data uncertainties in intermediate neutron spectrum problems and the intermediate neutron spectrum experiment

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During the investigation of various surplus fissile material disposition proposals, uncertainties in the data of SiO{sub 2}/Pu mixtures were discovered. These uncertainties were detected for Si/Pu ratios ranging from approximately 20:1 to 200:1. Additionally, it has been reported that metal/U{sup 235} mixtures also have data uncertainties. These problems with large data uncertainties are typically intermediate spectrum problems, i.e. problems which are dominated by scattering and fissions occurring in the energy range of 10 eV to 1 MeV. ANSI/ANS-8.1-1983 states that the ``bias shall be established by correlating the results of criticality experiments with the results obtained for these same systems ... continued below

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8 p.

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Jaegers, P.J.; Hayes, D.; Sanchez, R.G. & Kimpland, R.H. February 1, 1996.

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Description

During the investigation of various surplus fissile material disposition proposals, uncertainties in the data of SiO{sub 2}/Pu mixtures were discovered. These uncertainties were detected for Si/Pu ratios ranging from approximately 20:1 to 200:1. Additionally, it has been reported that metal/U{sup 235} mixtures also have data uncertainties. These problems with large data uncertainties are typically intermediate spectrum problems, i.e. problems which are dominated by scattering and fissions occurring in the energy range of 10 eV to 1 MeV. ANSI/ANS-8.1-1983 states that the ``bias shall be established by correlating the results of criticality experiments with the results obtained for these same systems by the method being validated``. There is however, a definite lack of critical experiments with an intermediate neutron spectrum. We have identified two potential areas from which these uncertainties may arise. The first potential source of uncertainty in the nuclear data is due to fact that the cross-sections of the fissile material have not been tested in an intermediate energy spectrum. The second potential source of uncertainty is that the non-fissile material in the mixture may not have been appropriately tested in a critical experiment. To provide this benchmark data a critical experiment is necessary.

Physical Description

8 p.

Notes

INIS; OSTI as DE96004783

Source

  • SPECTRUM `96: international conference on nuclear and hazardous waste management, Seattle, WA (United States), 18-23 Aug 1996

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  • Other: DE96004783
  • Report No.: LA-UR--95-4060
  • Report No.: CONF-960804--3
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 249212
  • Archival Resource Key: ark:/67531/metadc669280

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  • February 1, 1996

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  • June 29, 2015, 9:42 p.m.

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  • Feb. 29, 2016, 6:32 p.m.

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Jaegers, P.J.; Hayes, D.; Sanchez, R.G. & Kimpland, R.H. Nuclear data uncertainties in intermediate neutron spectrum problems and the intermediate neutron spectrum experiment, article, February 1, 1996; New Mexico. (digital.library.unt.edu/ark:/67531/metadc669280/: accessed August 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.