SPECIAL ANALYSIS: REVISION OF INTERMEDIATE LEVEL VAULT DISPOSAL LIMITS

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New disposal limits have been computed for the IL vaults based on several revisions to the performance assessment. The most important changes are implementation of a 1,000 year time for compliance, rather than 10,000 years, and consideration of additional radon precursors. Other revisions include refinement of the aquifer mesh to more accurately model the footprint of two intermediate level (IL) vaults, a new Pu chemistry model accounting for the different transport properties of oxidation states III/IV and V/VI, and implementation of a timed sum-of-fractions approach to setting limits. A significant decrease in the groundwater pathway limits for I-129 was speculated ... continued below

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FLACH, GREGORY July 20, 2004.

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Description

New disposal limits have been computed for the IL vaults based on several revisions to the performance assessment. The most important changes are implementation of a 1,000 year time for compliance, rather than 10,000 years, and consideration of additional radon precursors. Other revisions include refinement of the aquifer mesh to more accurately model the footprint of two intermediate level (IL) vaults, a new Pu chemistry model accounting for the different transport properties of oxidation states III/IV and V/VI, and implementation of a timed sum-of-fractions approach to setting limits. A significant decrease in the groundwater pathway limits for I-129 was speculated in the FY2003 interim measures assessment, in response to refinement of the aquifer mesh and source node definition. In fact, the new limits for these nuclides are only slightly lower. Based on the IL vault inventory as of 7/2/04 and disposal limits developed herein, the largest inventory fractions are 30 per cent for Ra-226 and the radon analysis, 11 per cent for I-129 (generic) and the groundwater pathway, and 9 percent for C-14 and the air pathway. For comparison the volume-filled fraction is at about 36 percent. Continued operation of the IL vault should not challenge performance objectives, assuming future disposal patterns are similar to historic use of the facility.

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  • Other Information: PBD: 20 Jul 2004

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  • Report No.: WSRC-TR-2004-00346
  • Grant Number: AC09-96SR18500
  • DOI: 10.2172/833396 | External Link
  • Office of Scientific & Technical Information Report Number: 833396
  • Archival Resource Key: ark:/67531/metadc780654

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  • July 20, 2004

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  • Dec. 3, 2015, 9:30 a.m.

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  • May 5, 2016, 5:31 p.m.

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FLACH, GREGORY. SPECIAL ANALYSIS: REVISION OF INTERMEDIATE LEVEL VAULT DISPOSAL LIMITS, report, July 20, 2004; South Carolina. (digital.library.unt.edu/ark:/67531/metadc780654/: accessed August 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.