Validation of the Multiscale Thermohydrologic Model used for analysis of a proposed repository at Yucca Mountain

Buscheck, Thomas A.; Glascoe, L; Lee, K.H; Gansemer, J.; Sun, Yunwei; Mansoor, Kayyum

doi:10.1016/s0169-7722(02)00157-2

Cited by 35 publications

(17 citation statements)

References 7 publications

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“…However, this is beyond the scope of the current study. For the purpose of this study, we assign appropriate boundary conditions on the surfaces of the drift wall, invert, and drip shield on the basis of results fiom the Multiscale Thermohydrologic Model (MSTHM) [8,9,101. The MSTHM, which is based on porousmedium Darcy-flow approximations, predicts the coupled thermal-hydrological conditions at both drift-scale and mountain-scale.…”

Section: Ill Results and Discussionmentioning

confidence: 99%

Double-Diffusive Natural Convection in a Nuclear Waste Repository

Nitao

Buscheck

et al. 2008

Nuclear Technology

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-In this study, we conduct a two-dimensional numerical analysis of double diffusive natural convection in an er?lplacement drift for a nuclear waste repository. In-drift heat and moisture transport is driven by combined thermal-and conlpositional-induced buoyancy forces. Numerical results demonstrate buoyancy-driven convective flow patterns and configurations during both repository heat-up and cool-down phases. It is also shown that bounda ry conditions, particularly on the drip-shield surfnce, have strong impacts on the in-drift convective flow and transport.

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Section: Ill Results and Discussionmentioning

confidence: 99%

Double-Diffusive Natural Convection in a Nuclear Waste Repository

Nitao

Buscheck

et al. 2008

Nuclear Technology

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“…In this study, we used the NUFT (Nonisothermal Unsaturated-saturated Flow and Transport) code, which was developed at Lawrence Livermore National Laboratory (LLNL) to simulate multi-phase multicomponent heat and mass flow and reactive transport in unsaturated and saturated porous media (Nitao, 1998;Buscheck et al, 2003;Johnson et al, 2004aJohnson et al, , 2004bCarroll et al, 2009;Morris et al, 2011). The pore and fluid compressibility are 4.5 × 10 -10 and 3.5 × 10 -10 Pa -1 , respectively.…”

Section: Model Methodologymentioning

confidence: 99%

Two-Stage, Integrated, Geothermal-CO2 Storage Reservoirs: An Approach for Sustainable Energy Production, CO2-Sequestration Security, and Reduced Environmental Risk

Buscheck¹,

Chen²,

Sun³

et al. 2012

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We introduce a hybrid two-stage energy-recovery approach to sequester CO 2 and produce geothermal energy at low environmental risk and low cost by integrating geothermal production with CO 2 capture and sequestration (CCS) in saline, sedimentary formations. Our approach combines the benefits of the approach proposed by Buscheck et al. (2011b), which uses brine as the working fluid, with those of the approach first suggested by Brown (2000) and analyzed by Pruess (2006), using CO 2 as the working fluid, and then extended to saline-formation CCS by Randolph and Saar (2011a). During stage one of our hybrid approach, formation brine, which is extracted to provide pressure relief for CO 2 injection, is the working fluid for energy recovery. Produced brine is applied to a consumptive beneficial use: feedstock for fresh water production through desalination, saline cooling water, or make-up water to be injected into a neighboring reservoir operation, such as in Enhanced Geothermal Systems (EGS), where there is often a shortage of a working fluid. For stage one, it is important to find economically feasible disposition options to reduce the volume of brine requiring reinjection in the integrated geothermal-CCS reservoir (Buscheck et al. 2012a). During stage two, which begins as CO 2 reaches the production wells; coproduced brine and CO 2 are the working fluids. We present preliminary reservoir engineering analyses of this approach, using a simple conceptual model of a homogeneous, permeable CO 2 storage formation/geothermal reservoir, bounded by relatively impermeable sealing units. We assess both the CO 2 sequestration capacity and geothermal energy production potential as a function of well spacing between CO 2 injectors and brine/CO 2 producers for various well patterns and for a range of subsurface conditions.

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“…The Monod-type reaction and inhibition terms become one and the kinetics are controlled only by the power law format in this case. The verification and validation of transport and reaction capabilities are described in Buscheck et al (2003) and Hao et al (2010). Although the simulation-emulation approach is applicable to a wide range of reaction kinetics, we prefer to use the sequentially reactive transport as a benchmark problem for demonstrating the methodology.…”

Section: Simulationmentioning

confidence: 99%

Combining Simulation and Emulation for Calibrating Sequentially Reactive Transport Systems

et al. 2011

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Reaction rates are usually identified at laboratory scale, by comparing measured concentrations with those of the corresponding mathematical models. However, laboratoryscale reaction rates may not necessarily reflect the reactive transport scenarios at the field scale. Thus, a major challenge for field-scale modeling is the determination of reaction kinetics and rates. The conventional inversion of reaction rates relies on optimization approaches that require expensive computation to obtain the gradient of objective functions. In this manuscript, we present a combined simulation-emulation approach for calibrating the first-order reaction rates at the field scale. A number of sample points are adaptively selected to represent the high-dimensional parametric space including dimensions of reaction rates. Correspondingly, reactive transport models are generated and executed for constructing response surfaces of objective functions. Taking the advantage of smooth response surfaces, optimization of reaction rates is efficiently performed. For several benchmark cases, the advantage of using global sensitivity analysis and uncertainty quantification of the objective functions in terms of uncertain reaction rates is demonstrated.

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Validation of the Multiscale Thermohydrologic Model used for analysis of a proposed repository at Yucca Mountain

Cited by 35 publications

References 7 publications

Double-Diffusive Natural Convection in a Nuclear Waste Repository

Double-Diffusive Natural Convection in a Nuclear Waste Repository

Two-Stage, Integrated, Geothermal-CO2 Storage Reservoirs: An Approach for Sustainable Energy Production, CO2-Sequestration Security, and Reduced Environmental Risk

Combining Simulation and Emulation for Calibrating Sequentially Reactive Transport Systems

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