Performance assessment of the Greater Confinement Disposal facility on the Nevada Test Site: Comparing the performance of two conceptual site models

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A small amount of transuranic (TRU) waste has been disposed of at the Greater Confinement Disposal (GCD) site located on the Nevada Test Site`s (NTS) Radioactive Waste Management Site (RWMS). The waste has been buried in several deep (37 m) boreholes dug into the floor of an alluvial basin. For the waste to remain in its current configuration, the DOE must demonstrate compliance of the site with the TRU disposal requirements, 40 CFR 191. Sandia`s approach to process modelling in performance assessment is to use demonstrably conservative models of the site. Choosing the most conservative model, however, can be uncertain. … continued below

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11 p.

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Baer, T. A.; Price, L. L. & Gallegos, D. P. December 31, 1993.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM (United States)
    Place of Publication: Albuquerque, New Mexico

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A small amount of transuranic (TRU) waste has been disposed of at the Greater Confinement Disposal (GCD) site located on the Nevada Test Site`s (NTS) Radioactive Waste Management Site (RWMS). The waste has been buried in several deep (37 m) boreholes dug into the floor of an alluvial basin. For the waste to remain in its current configuration, the DOE must demonstrate compliance of the site with the TRU disposal requirements, 40 CFR 191. Sandia`s approach to process modelling in performance assessment is to use demonstrably conservative models of the site. Choosing the most conservative model, however, can be uncertain. As an example, diffusion of contaminants upward from the buried waste in the vadose zone water is the primary mechanism of release. This process can be modelled as straight upward planar diffusion or as spherical diffusion in all directions. The former has high fluxes but low release areas, the latter has lower fluxes but is spread over a greater area. We have developed analytic solutions to a simple test problem for both models and compared the total integrated discharges. The spherical diffusion conceptual model results in at least five times greater release to the accessible environment than the planar model at all diffusivities. Modifying the planar model to allow for a larger release, however, compensated for the smaller original planar discharge and resulted in a new planar model that was more conservative that the spherical model except at low diffusivities.

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11 p.

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INIS; OSTI as DE94006195; Paper copy available at OSTI: phone, 865-576-8401, or email, reports@adonis.osti.gov

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  • Waste management `94: working towards a cleaner environment,Tucson, AZ (United States),27 Feb - 3 Mar 1994

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  • Other: DE94006195
  • Report No.: SAND--93-2174C
  • Report No.: CONF-940225--1
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 10119600
  • Archival Resource Key: ark:/67531/metadc1276748

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  • December 31, 1993

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  • Oct. 12, 2018, 6:44 a.m.

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  • Nov. 15, 2018, 2:40 p.m.

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Baer, T. A.; Price, L. L. & Gallegos, D. P. Performance assessment of the Greater Confinement Disposal facility on the Nevada Test Site: Comparing the performance of two conceptual site models, article, December 31, 1993; Albuquerque, New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc1276748/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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