Criticality safety of low-density storage arrays

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This note proposes a straightforward and simple method for the criticality safety analysis of fissionable materials configured into large arrays of standard containers. While criticality-safe storage limits have been well-established for standard containers--even under flooded conditions, it is also necessary to rule out the potential for criticality arising from neutronic interactions among multiple containers that might build up over long distances in a large array. Traditionally, the array problem has been approached by individual Monte Carlo analyses of explicit arrangements of single units and their surroundings. Here, the authors show how multiple Monte Carlo analyses can be usefully combined for ... continued below

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6 p.

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Bauer, T.H. May 1, 1996.

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  • Bauer, T.H. Argonne National Lab., IL (United States). Reactor Engineering Div.

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Description

This note proposes a straightforward and simple method for the criticality safety analysis of fissionable materials configured into large arrays of standard containers. While criticality-safe storage limits have been well-established for standard containers--even under flooded conditions, it is also necessary to rule out the potential for criticality arising from neutronic interactions among multiple containers that might build up over long distances in a large array. Traditionally, the array problem has been approached by individual Monte Carlo analyses of explicit arrangements of single units and their surroundings. Here, the authors show how multiple Monte Carlo analyses can be usefully combined for wide-ranging general application. The technique takes advantage of low average density of fissionable material in typical storage arrays to separate neutron interactions that take place in the neutron`s ``birth unit`` from subsequent interactions in a highly dilute array. Effects of array size, in particular, are conservatively calculated by straightforward analyses which simply smear array contents uniformly across the extent of the array. For given unit loadings in standard containers, practical expressions for neutron multiplication depend only on overall array shape, size and reflective boundary.

Physical Description

6 p.

Notes

INIS; OSTI as DE96009448

Source

  • Annual meeting of the American Nuclear Society (ANS), Reno, NV (United States), 16-20 Jun 1996

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  • Other: DE96009448
  • Report No.: ANL/RE/SUMM--88739
  • Report No.: CONF-9606116--24
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 238573
  • Archival Resource Key: ark:/67531/metadc665511

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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.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • May 1, 1996

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  • June 29, 2015, 9:42 p.m.

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  • Dec. 16, 2015, 12:14 p.m.

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Bauer, T.H. Criticality safety of low-density storage arrays, article, May 1, 1996; Illinois. (digital.library.unt.edu/ark:/67531/metadc665511/: accessed October 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.