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Overview Scientific Rationale Societal Imperatives Science and Engineering Needs Approach

Some Needs and Potential Benefits Related to a National Underground Science Laboratory NUSL–Geo-Hydrology–Engineering-Team. Overview Scientific Rationale Societal Imperatives Science and Engineering Needs Approach Anticipated Benefits. Scientific Rationale Societal Imperatives.

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Overview Scientific Rationale Societal Imperatives Science and Engineering Needs Approach

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  1. Some Needs and Potential Benefits Related to aNational Underground Science LaboratoryNUSL–Geo-Hydrology–Engineering-Team • Overview • Scientific Rationale • Societal Imperatives • Science and Engineering Needs • Approach • Anticipated Benefits ARMA-NSF-NeSS Workshop

  2. Scientific RationaleSocietal Imperatives • Resource Recovery • Petroleum and Natural Gas Recovery in Conventional & Unconventional Reservoirs • In Situ Mining • HDR/EGS • Potable Water Supply • Mining Hydrology • Waste Containment/Disposal • Deep Waste Injection • Nuclear Waste Disposal • CO2 Sequestration • Cryogenic Storage/Petroleum/Gas • Site Restoration • Acid-Rock Drainage • Aquifer Remediation ARMA-NSF-NeSS Workshop

  3. Scientific Rationale (Cont’d)Science & Engineering Needs 1.Mechanical &Transport Behavior (momentum, fluid, mass, & energy fluxes) 2. Solid- and Fluid-Environment Interaction 3. Characterization of Mechanical and Transport Properties 4. Sensing, Data Fusion, and Modeling Natural fracture Artificial fracture ARMA-NSF-NeSS Workshop

  4. Science & Engineering Needs (Cont’d) 1. Mechanical and Transport Behavior • Connectivity of Fracture Networks • Multi-phase Flow • Particulate (Colloid/Bacterial) Transport ARMA-NSF-NeSS Workshop

  5. Percolation Solute flux (Dagan et al. 1992) Remote Sensing ARMA-NSF-NeSS Workshop

  6. Science & Engineering Needs (Cont’d) 2. Solid- & Fluid-Environment Interaction • Models of Fracture Development • Coupled Processes • THM • CB • THMCB 800C 1200C 1500C 800C 1200C ARMA-NSF-NeSS Workshop

  7. Importance of Large-Scale In-Situ Experiments Example of thermal-hydrological- chemical processes in boiling unsaturated fractured rock • Validation of coupled reaction-transport conceptual and numerical models requires well-controlled in-situ experiments (not found in nature) • Effective reaction rates are controlled by the hierarchy of scale of fluid flow - e.g., flow in a fracture, through the fracture network, and flow between the rock matrix and the adjacent fractures • Reaction-transport processes can be strongly coupled to permeability changes from rock mechanical processes and can affect rock deformation as a result of changing mineralogy, permeability, and the chemical environment at fracture tips • The Drift-Scale Test at Yucca Mountain has been used to study coupled thermal-hydrological-chemical-mechanical processes in unsaturated fractured tuff • However, different geological and chemical environments can result in different system evolutions ARMA-NSF-NeSS Workshop

  8. Coupled Thermal, Hydrological, and Chemical Processes in the Drift Scale Test at Yucca Mountain Purpose of the test is to evaluate coupled thermal, hydrological, mechanical and chemical processes surrounding the potential repository Dimensions: ~ 50 meters long by 5 meters in diameter Electric heaters activated Dec. 1997, turned off Jan. 2002 Maximum drift wall temperature reached ~ 200°C Water, gas, and rock samples collected from boreholes for geochemical and isotopic studies Reaction-transport modeling performed prior to and during test (examples on following slides) ARMA-NSF-NeSS Workshop

  9. Science & Engineering Needs (Cont’d) 3. Characterization of Mechanical & Transport Properties • Hydraulic Methods • Tracer Methods • Natural • Forced • Aqueous (Conservative/Reactive) • Thermal • Particulate • Geophysical Methods • Drilling Methods ARMA-NSF-NeSS Workshop

  10. We think that this image might be telling us something about fracture orientations and intensity, but it is not clear what 7% 0% ARMA-NSF-NeSS Workshop

  11. Science & Engineering Needs (Cont’d) 4. Sensing, Data Fusion, and Modeling • Sensing • Data Fusion • Modeling ARMA-NSF-NeSS Workshop

  12. Science & Engineering Needs (Cont’d) • Imperatives • Strong scale dependence • THMCB processes incompletely understood • The role of serendipity in scientific advance • Approach • Run-of-Mine Experiments (HCB) • Experiments Concurrent with Excavation of the Detector Caverns (THM) • Purpose-Built Experiments (THMCB) • Large Block Tests • Mine-By and Drift Structure Tests • Educational Opportunities ARMA-NSF-NeSS Workshop

  13. Science & Engineering Needs (Cont’d) • Anticipated Benefits and Applications • Resource Recovery and Security • Waste Containment/Disposal • Site Restoration • Education ARMA-NSF-NeSS Workshop

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