Numerical modeling of a thermohydrochemical (T-H-C) coupling and the implications to radionuclide transport.

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Thermohydrochemical (T-H-C) processes result from the placement of heat-generating radioactive materials in unsaturated, fractured geologic materials. The placement of materials in the proposed Yucca Mountain repository will result in complex environmental conditions. Simple models are developed liking the thermohydrological effects simulated with TOUGHZ to system chemistry, with an example presented for chloride. Perturbations to near-field chemistry could have a significant impact on the migration of actinides and fission products in geologic materials. Various conceptual models to represent fractures are utilized in TOUGHZ simulations of thermohydrological processes. The simulated moisture redistribution is then coupled to simple chemical models to demonstrate the ... continued below

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17 p.

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Esh, D. W. & Scheetz, B. E. September 21, 1999.

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Thermohydrochemical (T-H-C) processes result from the placement of heat-generating radioactive materials in unsaturated, fractured geologic materials. The placement of materials in the proposed Yucca Mountain repository will result in complex environmental conditions. Simple models are developed liking the thermohydrological effects simulated with TOUGHZ to system chemistry, with an example presented for chloride. Perturbations to near-field chemistry could have a significant impact on the migration of actinides and fission products in geologic materials. Various conceptual models to represent fractures are utilized in TOUGHZ simulations of thermohydrological processes. The simulated moisture redistribution is then coupled to simple chemical models to demonstrate the potential magnitude of T-H-C processes. The concentration of chloride in solution (returning to the engineered barrier system) is demonstrated, in extreme cases, to exceed 100,000 mg/L. The implication is that the system (typically ambient chemical and hydrological conditions) in which radionuclide transport is typically simulated and measured may be significantly different from the perturbed system.

Physical Description

17 p.

Notes

INIS; OSTI as DE00750503

Medium: P; Size: 17 pages

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  • Migration '99, Lake Tahoe, NV (US), 09/26/1999--10/01/1999

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  • Report No.: ANL/NT/CP-100065
  • Grant Number: W-31-109-ENG-38
  • Office of Scientific & Technical Information Report Number: 750503
  • Archival Resource Key: ark:/67531/metadc708149

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Office of Scientific & Technical Information Technical Reports

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  • September 21, 1999

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  • Sept. 12, 2015, 6:31 a.m.

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  • April 7, 2017, 3:44 p.m.

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Esh, D. W. & Scheetz, B. E. Numerical modeling of a thermohydrochemical (T-H-C) coupling and the implications to radionuclide transport., article, September 21, 1999; Illinois. (digital.library.unt.edu/ark:/67531/metadc708149/: accessed October 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.