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EGS rock reactions with Supercritical CO2 saturated with water and water saturated with Supercritical CO2

Description: EGS using CO2 as a working fluid will likely involve hydro-shearing low-permeability hot rock reservoirs with a water solution. After that process, the fractures will be flushed with CO2 that is maintained under supercritical conditions (> 70 bars). Much of the injected water in the main fracture will be flushed out with the initial CO2 injection; however side fractures, micro fractures, and the lower portion of the fracture will contain connate water that will interact with the rock and the in… more
Date: February 1, 2013
Creator: Mattson, Earl D.; McLing, Travis L.; Smith, William & Palmer, Carl
Partner: UNT Libraries Government Documents Department
open access

High-Efficiency Retrofit Lessons for Retail from a SuperTarget: Preprint

Description: The National Renewable Energy Laboratory partnered with Target under the Commercial Building Program to design and implement a retrofit of a SuperTarget in Thornton, CO. The result was a retrofit design that predicted 37% energy savings over ASHRAE Standard 90.1-2004, and 29% compared to existing (pre-retrofit) store consumption. The largest savings came from energy efficient lighting, energy efficient cooling systems, improved refrigeration, and better control of plug loads.
Date: February 1, 2013
Creator: Langner, R.; Deru, M.; Hirsch, A. & Williams, S.
Partner: UNT Libraries Government Documents Department
open access

Simulated evolution of fractures and fracture networks subject to thermal cooling: A coupled discrete element and heat conduction model

Description: Advancement of EGS requires improved prediction of fracture development and growth during reservoir stimulation and long-term operation. This, in turn, requires better understanding of the dynamics of the strongly coupled thermo-hydro-mechanical (THM) processes within fractured rocks. We have developed a physically based rock deformation and fracture propagation simulator by using a quasi-static discrete element model (DEM) to model mechanical rock deformation and fracture propagation induced b… more
Date: February 1, 2013
Creator: Huang, Hai; Plummer, Mitchell & Podgorney, Robert
Partner: UNT Libraries Government Documents Department
open access

Characterizing surplus US plutonium for disposition

Description: The United States (US) has identified 61.5 metric tons (MT) of plutonium that is permanently excess to use in nuclear weapons programs, including 47.2 MT of weapons-grade plutonium. Surplus inventories will be stored safely by the Department of Energy (DOE) and then transferred to facilities that will prepare the plutonium for permanent disposition. The Savannah River National Laboratory (SRNL) operates a Feed Characterization program for the Office of Fissile Materials Disposition (OFMD) of th… more
Date: February 26, 2013
Creator: Allender, Jeffrey S. & Moore, Edwin N.
Partner: UNT Libraries Government Documents Department
open access

Validation of FSP Reactor Design with Sensitivity Studies of Beryllium-Reflected Critical Assemblies

Description: The baseline design for space nuclear power is a fission surface power (FSP) system: sodium-potassium (NaK) cooled, fast spectrum reactor with highly-enriched-uranium (HEU)-O2 fuel, stainless steel (SS) cladding, and beryllium reflectors with B4C control drums. Previous studies were performed to evaluate modeling capabilities and quantify uncertainties and biases associated with analysis methods and nuclear data. Comparison of Zero Power Plutonium Reactor (ZPPR)-20 benchmark experiments with th… more
Date: February 1, 2013
Creator: Bess, John D. & Marshall, Margaret A.
Partner: UNT Libraries Government Documents Department
open access

Benchmark Evaluation of the Medium-Power Reactor Experiment Program Critical Configurations

Description: A series of small, compact critical assembly (SCCA) experiments were performed in 1962-1965 at the Oak Ridge National Laboratory Critical Experiments Facility (ORCEF) for the Medium-Power Reactor Experiment (MPRE) program. The MPRE was a stainless-steel clad, highly enriched uranium (HEU)-O2 fuelled, BeO reflected reactor design to provide electrical power to space vehicles. Cooling and heat transfer were to be achieved by boiling potassium in the reactor core and passing vapor directly through… more
Date: February 1, 2013
Creator: Marshall, Margaret A. & Bess, John D.
Partner: UNT Libraries Government Documents Department
open access

Radiation Stability of Benzyl Tributyl Ammonium Chloride Towards Technetium-99 Extraction

Description: A closed nuclear fuel cycle combining new separation technologies along with generation III and generation IV reactors is a promising way to achieve a sustainable energy supply. But it is important to keep in mind that future recycling processes of used nuclear fuel (UNF) must minimize wastes, improve partitioning process, and integrate waste considerations into processes. New separation processes are being developed worldwide to complement the actual industrialized PUREX process which selectiv… more
Date: February 1, 2013
Creator: Horkley, Jared; Roman, Audrey; Campbell, Keri; Nunez, Ana & Espartero, Amparo
Partner: UNT Libraries Government Documents Department
open access

Characterization of a high-temperature superconducting conductor on round core cables in magnetic fields up to 20 T

Description: The next generation of high-field magnets that will operate at magnetic fields substantially above 20 T, or at temperatures substantially above 4.2 K, requires high-temperature superconductors (HTS). Conductor on round core (CORC) cables, in which RE-Ba{sub 2}Cu{sub 3}O{sub 7-{delta}} (RE = rare earth) (REBCO) coated conductors are wound in a helical fashion on a fl‚exible core, are a practical and versatile HTS cable option for low-inductance, high-field magnets. We performed the first tes… more
Date: February 13, 2013
Creator: van der Laan, Danko; Noyes, Patrick; Miller, George; Weijers, Hubertus & Willering, Gerard
Partner: UNT Libraries Government Documents Department
open access

Echo-Enabled X-Ray Vortex Generation

Description: No Description Available.
Date: February 7, 2013
Creator: Hemsing, E. & Marinelli, A.
Partner: UNT Libraries Government Documents Department
open access

NIF Target Fabrication

Description: No Description Available.
Date: February 6, 2013
Creator: Hamza, A V
Partner: UNT Libraries Government Documents Department
open access

Numerical Stability and Accuracy of Temporally Coupled Multi-Physics Modules in Wind-Turbine CAE Tools

Description: In this paper we examine the stability and accuracy of numerical algorithms for coupling time-dependent multi-physics modules relevant to computer-aided engineering (CAE) of wind turbines. This work is motivated by an in-progress major revision of FAST, the National Renewable Energy Laboratory's (NREL's) premier aero-elastic CAE simulation tool. We employ two simple examples as test systems, while algorithm descriptions are kept general. Coupled-system governing equations are framed in monolith… more
Date: February 1, 2013
Creator: Gasmi, A.; Sprague, M. A.; Jonkman, J. M. & Jones, W. B.
Partner: UNT Libraries Government Documents Department
open access

Multicomponent Equilibrium Models for Testing Geot

Description: Geothermometry is an important tool for estimating
Date: February 1, 2013
Creator: Palmer, Carl D.; Smith, Robert W. & McLing, Travis L.
Partner: UNT Libraries Government Documents Department
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