Distribution of fast hydrologic paths in the unsaturated zone at Yucca Mountain

Technical Report · Wed Jun 02 04:00:00 EDT 1999

DOI:https://doi.org/10.2172/776505· OSTI ID:776505

Fabryka-Martin, J. T. ^[1]; Wolfsberg, A. V. ^[1]; Levy, S. S. ^[1]; Roach, J. L. ^[1]; Winters, S. T. ^[1]; Wolfsberg, L. E. ^[1]; Elmore, D. ^[2]; Sharma, P. ^[2]

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1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
2. Purdue Univ., West Lafayette, IN (United States). PRIME Lab.

Development and testing of conceptual flow and transport models for hydrologic systems are strengthened when natural environmental tracers are incorporated into the process. One such tracer is chlorine-36 ({sup 36}Cl, half-life, 301,000 years), a radioactive isotope produced in the atmosphere and carried underground with percolating groundwater. High concentrations of this isotope were also added to meteoric water during a period of global fallout from atmospheric testing of nuclear devices, primarily in the 1950s. This bomb-pulse signal has been used to test for the presence of fast transport paths in the unsaturated zone at Yucca Mountain and to provide the basis for a conceptual model for their distribution. Yucca Mountain is under investigation by the US Department of Energy as a potential site at which to host an underground high-level radioactive waste repository. Under wetter climatic conditions, fast-flow pathways will respond quickly to increases in infiltration and have the potential to become seeps in the tunnel drifts. The {sup 36}Cl data are also being used in numerical flow and transport models to establish lower bounds on infiltration rates, estimate ground water ages, and establish bounding values for hydrologic flow parameters governing fracture transport.

• Research Organization: Yucca Mountain Project, Las Vegas, NV (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC01-91RW00134
• OSTI ID: 776505
• Report Number(s): MOL.19990701.0135
• Country of Publication: United States
• Language: English

Related Subjects

12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES