Effects of closure cap and liner on contaminant release rates from grouted wastes Metadata

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Title

  • Main Title Effects of closure cap and liner on contaminant release rates from grouted wastes

Creator

  • Author: Yu, A.D.
    Creator Type: Personal
  • Author: Fowler, J.R.
    Creator Type: Personal
  • Author: Bignell, D.T.
    Creator Type: Personal

Contributor

  • Sponsor: United States. Department of Energy.
    Contributor Type: Organization
    Contributor Info: USDOE, Washington, DC (United States)

Publisher

  • Name: Westinghouse Savannah River Company
    Place of Publication: Aiken, South Carolina
    Additional Info: Westinghouse Savannah River Co., Aiken, SC (United States)

Date

  • Creation: 1996-08-01

Language

  • English

Description

  • Content Description: This paper describes a groundwater modeling study of waste disposal concepts using grouted waste forms. The focus of the study is on the effects of clay caps and concrete vaults on contaminant migration. The authors modeled three waste disposal scenarios: (1) Grouted waste was solidified in an earthen trench and covered with soil, there was no vault and no cap; (2) grouted waste was solidified in an earthen trench, the entire waste disposal facility was then closed under a clay cap; (3) grouted waste was solidified in a concrete vault and protected by the same closure as in 2. Because of the huge contrast in hydraulic conductivities and highly non-linear multi-phase flow characteristics, these waste disposal concepts presented a difficult problem for numerical simulation. Advanced fluid flow and contaminant transport codes were used to solve the problem. Among the codes tested, ECLIPSE out-performed other codes in speed, accuracy (smaller material balance errors) and capability in handling sophisticated scenarios. The authors used nitrate as a tracer for the simulation. Nitrate does not absorb in the solid phase and does not decay. As a result, predicted release rate based on nitrate is conservative. They also assumed that the facility is intact for 10,000 years. In other words, properties of the materials used for this study do not change with time. Predicted peak flux for the no vault and no closure case was 5.8 {times} 10{sup {minus}4} per year at 12 years. If a clay cap was installed, predicted peak flux was 8.5 {times} 10{sup {minus}5} per year at 110 years. If the grout was disposed in a concrete vault and covered by a clay cap, predicted peak flux became 4.4 {times} 10{sup {minus}6} per year at 8,000 years. Both concrete liner and clay cap can reduce the rate of contaminant release to the water table and delay the peak time.
  • Physical Description: 8 p.

Subject

  • Keyword: Radioactive Waste Facilities
  • Keyword: Liners
  • Keyword: Sealing Materials
  • Keyword: Concretes
  • Keyword: Contamination
  • Keyword: Hydraulic Conductivity
  • Keyword: Ground Water
  • Keyword: Radionuclide Migration
  • Keyword: Clays
  • Keyword: Coverings
  • Keyword: Flow Models
  • Keyword: Solidification
  • Keyword: Ground Disposal
  • Keyword: Waste Forms
  • Keyword: Computerized Simulation
  • STI Subject Categories: 05 Nuclear Fuels
  • Keyword: Soils
  • Keyword: Savannah River Plant
  • Keyword: Permeability
  • Keyword: Radioactive Waste Disposal
  • Keyword: E Codes
  • Keyword: Performance

Source

  • Conference: Society of Computer Simulation (SCS) multiconference: high performance computing, New Orleans, LA (United States), 8-11 Apr 1996

Collection

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

Institution

  • Name: UNT Libraries Government Documents Department
    Code: UNTGD

Resource Type

  • Article

Format

  • Text

Identifier

  • Other: DE96012429
  • Report No.: WSRC-MS--96-0042
  • Report No.: CONF-960482--9
  • Grant Number: AC09-89SR18035
  • Office of Scientific & Technical Information Report Number: 270697
  • Archival Resource Key: ark:/67531/metadc665311

Note

  • Display Note: INIS; OSTI as DE96012429