An approximate-reasoning-based method for screening flammable gas tanks Metadata

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  • Main Title An approximate-reasoning-based method for screening flammable gas tanks


  • Author: Eisenhawer, S.W.
    Creator Type: Personal
  • Author: Bott, T.F.
    Creator Type: Personal
  • Author: Smith, R.E.
    Creator Type: Personal


  • Sponsor: United States. Department of Energy. Office of the Assistant Secretary, Management and Administration.
    Contributor Type: Organization
    Contributor Info: USDOE Assistant Secretary for Management and Administration, Washington, DC (United States)


  • Name: Los Alamos National Laboratory
    Place of Publication: New Mexico
    Additional Info: Los Alamos National Lab., NM (United States)


  • Creation: 1998-03-01


  • English


  • Content Description: High-level waste (HLW) produces flammable gases as a result of radiolysis and thermal decomposition of organics. Under certain conditions, these gases can accumulate within the waste for extended periods and then be released quickly into the dome space of the storage tank. As part of the effort to reduce the safety concerns associated with flammable gas in HLW tanks at Hanford, a flammable gas watch list (FGWL) has been established. Inclusion on the FGWL is based on criteria intended to measure the risk associated with the presence of flammable gas. It is important that all high-risk tanks be identified with high confidence so that they may be controlled. Conversely, to minimize operational complexity, the number of tanks on the watchlist should be reduced as near to the true number of flammable risk tanks as the current state of knowledge will support. This report presents an alternative to existing approaches for FGWL screening based on the theory of approximate reasoning (AR) (Zadeh 1976). The AR-based model emulates the inference process used by an expert when asked to make an evaluation. The FGWL model described here was exercised by performing two evaluations. (1) A complete tank evaluation where the entire algorithm is used. This was done for two tanks, U-106 and AW-104. U-106 is a single shell tank with large sludge and saltcake layers. AW-104 is a double shell tank with over one million gallons of supernate. Both of these tanks had failed the screening performed by Hodgson et al. (2) Partial evaluations using a submodule for the predictor likelihood for all of the tanks on the FGWL that had been flagged previously by Whitney (1995).
  • Physical Description: [200] p.


  • Keyword: Flammability
  • Keyword: Radioactive Waste Storage
  • Keyword: Computerized Simulation
  • STI Subject Categories: 05 Nuclear Fuels
  • Keyword: Safety Analysis
  • Keyword: Degassing
  • Keyword: Tanks
  • Keyword: High-Level Radioactive Wastes
  • Keyword: Hanford Reservation


  • Other Information: PBD: Mar 1998


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


  • Name: UNT Libraries Government Documents Department
    Code: UNTGD

Resource Type

  • Report


  • Text


  • Other: DE99000571
  • Report No.: LA-UR--98-1207
  • Grant Number: W-7405-ENG-36
  • DOI: 10.2172/290839
  • Office of Scientific & Technical Information Report Number: 290839
  • Archival Resource Key: ark:/67531/metadc674754


  • Display Note: INIS; OSTI as DE99000571