The potential for criticality following disposal of uranium at low-level waste facilities: Uranium blended with soil Metadata

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  • Main Title The potential for criticality following disposal of uranium at low-level waste facilities: Uranium blended with soil


  • Author: Toran, L.E.
    Creator Type: Personal
  • Author: Hopper, C.M.
    Creator Type: Personal
  • Author: Naney, M.T.
    Creator Type: Personal


  • Sponsor: U.S. Nuclear Regulatory Commission
    Contributor Type: Organization
    Contributor Info: Nuclear Regulatory Commission, Washington, DC (United States)


  • Name: Nuclear Regulatory Commission, Washington, DC (United States). Div. of Waste Management
    Place of Publication: United States
  • Name: Oak Ridge National Laboratory
    Place of Publication: Tennessee
    Additional Info: Oak Ridge National Lab., TN (United States)


  • Creation: 1997-06-01


  • English


  • Content Description: The purpose of this study was to evaluate whether or not fissile uranium in low-level-waste (LLW) facilities can be concentrated by hydrogeochemical processes to permit nuclear criticality. A team of experts in hydrology, geology, geochemistry, soil chemistry, and criticality safety was formed to develop achievable scenarios for hydrogeochemical increases in concentration of special nuclear material (SNM), and to use these scenarios to aid in evaluating the potential for nuclear criticality. The team`s approach was to perform simultaneous hydrogeochemical and nuclear criticality studies to (1) identify some achievable scenarios for uranium migration and concentration increase at LLW disposal facilities, (2) model groundwater transport and subsequent concentration increase via sorption or precipitation of uranium, and (3) evaluate the potential for nuclear criticality resulting from potential increases in uranium concentration over disposal limits. The analysis of SNM was restricted to {sup 235}U in the present scope of work. The outcome of the work indicates that criticality is possible given established regulatory limits on SNM disposal. However, a review based on actual disposal records of an existing site operation indicates that the potential for criticality is not a concern under current burial practices.
  • Physical Description: 136 p.


  • Keyword: Low-Level Radioactive Wastes
  • STI Subject Categories: 42 Engineering Not Included In Other Categories
  • Keyword: Criticality
  • Keyword: Ground Disposal
  • STI Subject Categories: 05 Nuclear Fuels
  • Keyword: Fissile Materials
  • Keyword: Safety Analysis
  • Keyword: Geochemistry
  • Keyword: Uranium 235
  • Keyword: Radionuclide Migration


  • Other Information: PBD: Jun 1997


  • Name: Office of Scientific & Technical Information Technical Reports
    Code: OSTI


  • Name: UNT Libraries Government Documents Department
    Code: UNTGD

Resource Type

  • Report


  • Text


  • Other: TI97007300
  • Report No.: NUREG/CR--6505-Vol.1
  • Grant Number: AC05-96OR22464
  • DOI: 10.2172/501506
  • Office of Scientific & Technical Information Report Number: 501506
  • Archival Resource Key: ark:/67531/metadc695408


  • Display Note: INIS; OSTI as TI97007300