Basic elements in the review of criteria for nuclear criticality safety in transportation are the magnitudes of reactivity changes that may occur to a shipment of packages and those inherent in the regulatory procedure of assessment. The generic representation of criticality of reflected arrays of uncontained fissionable materials is used as a basis for comparison of packaged fissionable materials. The reactivities associated with array changes and perturbations representative of credible conditions that may occur in storage or transportation are summarized for air-spaced units of fissionable materials. Calculations of packaged fissionable material determined reactivities associated with similar changes to arrays of packages. Typical thermal insulating materials being studied are Celotex, wood, Foamglas, and a bonded vermiculite. The effect on the array neutron multiplication of these, with and without steel as an inner and outer container material, is examined. The present stage of the study has produced results illustrating the variable margin of subcriticality manifested by the criteria. Depending upon the packaging, mass loading and array reflector condition, the margin of subcriticality can be of the order of 1% in k/sub eff/. (ERA citation 03:044273)

  • Supplemental Notes:
    • Symposium on Packaging and Transportation of Radioactive Materials, Las Vegas, Nevada, May 7, 1978.
  • Corporate Authors:

    Oak Ridge National Laboratory

    P. O. Box 2008
    Oak Ridge, TN  United States  37831

    Los Alamos National Laboratory

    P.O. Box 1663
    Los Alamos, NM  United States  87545

    Department of Energy

    1000 Independence Avenue, SW
    Washington, DC  United States  20585
  • Authors:
    • Thomas, J T
    • Smith, D R
  • Publication Date: 1978

Media Info

  • Pagination: 20 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00186390
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Contract Numbers: W-7405-ENG-26
  • Files: TRIS
  • Created Date: Feb 27 1979 12:00AM