Possibility of experimental validation of criticality safety methodology in support of underground fuel storage efforts

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Critical systems which might be formed in geologic repositories as a result of long-term degradation of the storage media, leaching of plutonium from the storage media, and the redistribution of low concentrations of plutonium into underground sand layers or lenses can be characterized by positive reactivity feedback. Formation of such a systems can not be excluded when considering the burial of high enriched uranium or plutonium contaminated wastes or spent nuclear fuels. Although the probability of formation of a critical systems under such conditions is very low, the reliable prediction of neutron multiplication properties appears to be of great interest ... continued below

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6 p.

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Nikolaev, M.N. & Briggs, J.B. October 1, 1997.

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  • Nikolaev, M.N. State Scientific Center of Russian Federation, Obninsk (Russian Federation). Institute of Physics and Power Engineering
  • Briggs, J.B. Idaho National Engineering and Environment, Idaho Falls, ID (United States)

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Description

Critical systems which might be formed in geologic repositories as a result of long-term degradation of the storage media, leaching of plutonium from the storage media, and the redistribution of low concentrations of plutonium into underground sand layers or lenses can be characterized by positive reactivity feedback. Formation of such a systems can not be excluded when considering the burial of high enriched uranium or plutonium contaminated wastes or spent nuclear fuels. Although the probability of formation of a critical systems under such conditions is very low, the reliable prediction of neutron multiplication properties appears to be of great interest from a criticality safety view point. At the present time, all estimations of criticality are based only on evaluated neutron data because critical experiments are not available for large systems containing small quantities plutonium distributed throughout a typically encountered matrix material such as silicon dioxide. The possibility of providing such an experiment using the large Russian critical assemblies, BFS-1 or BFS-2, is considered. It is shown that critical systems containing small amounts of hydrogenous material (polyethylene) with positive reactivity feedback can by modeled in the BFS Facility.

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6 p.

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INIS; OSTI as DE98050309

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  • American Nuclear Society (ANS) topical meeting on criticality safety challenges in the next decade, Chelan, WA (United States), 7-11 Sep 1997

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  • Other: DE98050309
  • Report No.: INEL/CON--97-00636
  • Report No.: CONF-970926--
  • Grant Number: AC07-94ID13223
  • Office of Scientific & Technical Information Report Number: 565640
  • Archival Resource Key: ark:/67531/metadc694236

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • October 1, 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • April 25, 2016, 1:09 p.m.

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Nikolaev, M.N. & Briggs, J.B. Possibility of experimental validation of criticality safety methodology in support of underground fuel storage efforts, article, October 1, 1997; Idaho Falls, Idaho. (digital.library.unt.edu/ark:/67531/metadc694236/: accessed October 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.