Serial/Series Title
Electrofuels Program
8
Field Demonstration of a Membrane Process to Separate Nitrogen From Natural Gas Progress Report
6
Winter Fuels Report
4
ARM Facilities Newsletter
3
BEEST Program
3
Fiscal Year 2000
3
Fiscal Year 2005
3
Fiscal Year 2007
3
Petroleum Marketing Monthly
3
Establishment of an Industry-Driven Consortium Focused on Improving the Production Performance of Domestic Stripper Wells Quarterly Report
2
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Adaptive AMG with Coarsening Based on Compatible Weighted Matching
None
Date:
January 10, 2013
Creator:
D'Ambra, P & Vassilevski, P S
Object Type:
Report
System:
The UNT Digital Library
Characterization and Potential Remediation Approaches for Vadose Zone Contamination at Hanford 241-SX Tank Farm
Unplanned releases of radioactive and hazardous wastes have occurred at the 241-SX Tank Farm on the U.S. Department of Energy Hanford Site in southeast Washington State. Interim and long-term mitigation efforts are currently under evaluation for 241-SX Tank Farm. Two contiguous interim surface barriers have been designed for deployment at 241-SX Tank Farm to reduce future moisture infiltration; however, construction of the surface barriers has been deferred to allow testing of alternative technologies for soil moisture reduction and possibly contaminant source term reduction. Previous tests performed by other organizations at the Hanford Site have demonstrated that: vadose zone desiccation using large diameter (greater than 4 inch) boreholes is feasible; under certain circumstances, mobile contaminants may be removed in addition to water vapor; and small diameter (approximately 2 inch) boreholes (such as those placed by the direct push hydraulic hammer) can be used to perform vapor extractions. Evaluation of the previous work combined with laboratory test results have led to the design of a field proof-of-principle test to remove water and possibly mobile contaminants at greater depths, using small boreholes placed with the direct push unit.
Date:
January 10, 2013
Creator:
Eberlein, Susan J.; Sydnor, Harold A.; Parker, Danny L. & Glaser, Danney R.
Object Type:
Article
System:
The UNT Digital Library
Collaboration in long-term stewardship at DOE Hanford Site
The U.S. Department of Energy's (DOE) Hanford Site comprises approximately 1,517 km{sup 2} (586 mi{sup 2}) of land in southeastern Washington. The site was established in 1943 as part of the Manhattan Project to produce plutonium for the nation's nuclear weapons program. As the Cold War era came to an end, the mission of the site transitioned from weapons production to environmental cleanup. As the River Corridor area of the site cleanup is completed, the mission for that portion of the site will transition from active cleanup to continued protection of environment through the Long-Term Stewardship (LTS) Program. The key to successful transition from cleanup to LTS is the unique collaboration among three (3) different DOE Programs and three (3) different prime contractors with each contractor having different contracts. The LTS Program at the site is a successful model of collaboration resulting in efficient resolution of issues and accelerated progress that supports DOE's Richland Office 2015 Vision for the Hanford Site. The 2015 Vision for the Hanford Site involves shrinking the active cleanup footprint of the surface area of the site to approximately 20 mi{sup 2} on the Central Plateau. Hanford's LTS Program is defined in DOE's planning document, Hanford …
Date:
January 10, 2013
Creator:
Moren, R. J.; Zeisloft, J. H.; Feist, E. T.; Brown, D. & Grindstaff, K. D.
Object Type:
Article
System:
The UNT Digital Library
High Rate Laser Pitting Technique for Solar Cell Texturing
High rate laser pitting technique for solar cell texturing Efficiency of crystalline silicon solar cells can be improved by creating a texture on the surface to increase optical absorption. Different techniques have been developed for texturing, with the current state-of-the-art (SOA) being wet chemical etching. The process has poor optical performance, produces surfaces that are difficult to passivate or contact and is relatively expensive due to the use of hazardous chemicals. This project shall develop an alternative process for texturing mc-Si using laser micromachining. It will have the following features compared to the current SOA texturing process: -Superior optical surfaces for reduced front-surface reflection and enhanced optical absorption in thin mc-Si substrates -Improved surface passivation -More easily integrated into advanced back-contact cell concepts -Reduced use of hazardous chemicals and waste treatment -Similar or lower cost The process is based on laser pitting. The objective is to develop and demonstrate a high rate laser pitting process which will exceed the rate of former laser texturing processes by a factor of ten. The laser and scanning technologies will be demonstrated on a laboratory scale, but will use inherently technologies that can easily be scaled to production rates. The drastic increase in process …
Date:
January 10, 2013
Creator:
Herfurth, Hans J. & Pantsar, Henrikki
Object Type:
Report
System:
The UNT Digital Library
An Initial Evaluation Of Characterization And Closure Options For Underground Pipelines Within A Hanford Site Single-Shell Tank Farm
The Hanford Site includes 149 single-shell tanks, organized in 12 'tank farms,' with contents managed as high-level mixed waste. The Hanford Federal Facility Agreement and Consent Order requires that one tank farm, the Waste Management Area C, be closed by June 30, 2019. A challenge to this project is the disposition and closure of Waste Management Area C underground pipelines. Waste Management Area C contains nearly seven miles of pipelines and 200 separate pipe segments. The pipelines were taken out of service decades ago and contain unknown volumes and concentrations of tank waste residuals from past operations. To understand the scope of activities that may be required for these pipelines, an evaluation was performed. The purpose of the evaluation was to identify what, if any, characterization methods and/or closure actions may be implemented at Waste Management Area C for closure of Waste Management Area C by 2019. Physical and analytical data do not exist for Waste Management Area C pipeline waste residuals. To develop estimates of residual volumes and inventories of contamination, an extensive search of available information on pipelines was conducted. The search included evaluating historical operation and occurrence records, physical attributes, schematics and drawings, and contaminant inventories associated …
Date:
January 10, 2013
Creator:
Badden, Janet W.; Connelly, Michael P.; Seeley, Paul N. & Hendrickson, Michelle L.
Object Type:
Article
System:
The UNT Digital Library
The International Axion Observatory (IAXO)
None
Date:
January 10, 2013
Creator:
Vogel, J K
Object Type:
Article
System:
The UNT Digital Library
Physics of Radiation-driven Islands Near the Tokamak Density Limit
In previous work [1], the onset criterion for radiation driven islands [2] in combination with a simple cylindrical model of tokamak current channel behavior was shown to be consistent with the empirical scaling of the tokamak density limit [3]. A number of the unexplained phenomena at the density limit are consistent with this novel physics mechanism. In this work, a more formal theoretical underpinning, consistent with cylindrical tearing mode theory, is developed for the onset criteria of these modes. The appropriate derivation of the radiation-driven addition to the modified Rutherford equation is discussed. Additionally, the ordering of the terms in the MRE is examined in a regime near the density limit. It is hoped that given the apparent success of this simple model in explaining the observed global scalings will lead to a more comprehensive analysis of the possibility that radiation driven islands are the physics mechanism responsible for the density limit. In particular, with modern diagnostic capabilities detailed measurements of current densities, electron densities and impurity concentrations at rational surfaces should be possible, enabling verification of the concepts described above.
Date:
January 10, 2013
Creator:
D.A. Gates, L. Delgado-Apricio and R.B. White
Object Type:
Article
System:
The UNT Digital Library
Proceedings of RIKEN BNL Research Center Workshop: The Physics of p(up arrow)+A Collisions at RHIC
N/A
Date:
January 10, 2013
Creator:
Bai, M.; Goto, Y.; Heppelmann, S.; Jiang, X.; Liu, M.; Makdisi, Y. et al.
Object Type:
Report
System:
The UNT Digital Library
Saltstone SDU6 Modeling Study
A new disposal unit, designated as Saltstone Disposal Unit 6 (SDU6), is being designed for support of site accelerated closure goals and salt waste projections identified in the new Liquid Waste System Plan. The unit is a cylindrical disposal cell of 375 ft in diameter and 43 ft in height, and it has a minimum 30 million gallons of capacity. SRNL was requested to evaluate the impact of an increased grout placement height on the flow patterns radially spread on the floor and to determine whether grout quality is impacted by the height. The primary goals of the work are to develop the baseline Computational Fluid Dynamics (CFD) model and to perform the evaluations for the flow patterns of grout material in SDU6 as a function of elevation of grout discharge port and grout rheology. Two transient grout models have been developed by taking a three-dimensional multiphase CFD approach to estimate the domain size of the grout materials radially spread on the facility floor and to perform the sensitivity analysis with respect to the baseline design and operating conditions such as elevation height of the discharge port and fresh grout properties. For the CFD modeling calculations, air-grout Volume of Fluid …
Date:
January 10, 2013
Creator:
Lee, Si Y. & Hyun, Sinjae
Object Type:
Report
System:
The UNT Digital Library
Shifting the Paradigm for Long Term Monitoring at Legacy Sites to Improve Performance while Reducing Cost
A major issue facing many government and private industry sites that were previously contaminated with radioactive and chemical wastes is that often the sites cannot be cleaned up enough to permit unrestricted human access. These sites will require long-term management, in some cases indefinitely, leaving site owners with the challenge of protecting human health and environmental quality in a cost effective manner. Long-term monitoring of groundwater contamination is one of the largest projected costs in the life cycle of environmental management at the Savannah River Site (SRS), the larger DOE complex, and many large federal and private sites. Currently, most monitoring strategies are focused on laboratory measurements of contaminants measured in groundwater samples collected from wells. This approach is expensive, and provides limited and lagging information about the effectiveness of cleanup activities and the behavior of the residual contamination. Over the last twenty years, DOE and other federal agencies have made significant investments in the development of various types of sensors and strategies that would allow for remote analysis of contaminants in groundwater, but these approaches do not promise significant reductions in risk or cost. Scientists at SRS have developed a new paradigm to simultaneously improve the performance of long …
Date:
January 10, 2013
Creator:
Eddy-Dilek, Carol A.; Looney, Brian B.; Seaman, John & Kmetz, Thomas
Object Type:
Article
System:
The UNT Digital Library
A study of grout flow pattern analysis
A new disposal unit, designated as Salt Disposal Unit no. 6 (SDU6), is being designed for support of site accelerated closure goals and salt nuclear waste projections identified in the new Liquid Waste System plan. The unit is cylindrical disposal vault of 380 ft diameter and 43 ft in height, and it has about 30 million gallons of capacity. Primary objective was to develop the computational model and to perform the evaluations for the flow patterns of grout material in SDU6 as function of elevation of grout discharge port, and slurry rheology. A Bingham plastic model was basically used to represent the grout flow behavior. A two-phase modeling approach was taken to achieve the objective. This approach assumes that the air-grout interface determines the shape of the accumulation mound. The results of this study were used to develop the design guidelines for the discharge ports of the Saltstone feed materials in the SDU6 facility. The focusing areas of the modeling study are to estimate the domain size of the grout materials radially spread on the facility floor under the baseline modeling conditions, to perform the sensitivity analysis with respect to the baseline design and operating conditions such as elevation of …
Date:
January 10, 2013
Creator:
Lee, S. Y. & Hyun, S.
Object Type:
Article
System:
The UNT Digital Library
Tensor hypercontraction: A universal technique for the resolution of matrix elements of local, finite-range, N-body potentials in many-body quantum problems
None
Date:
January 10, 2013
Creator:
Parrish, R.; Hoenstein, E.; Schunck, N.; Sherrill, D. & Martinez, T.
Object Type:
Article
System:
The UNT Digital Library
Ulta-Low Temperature Properties of Amorphous and Glassy Materials
During the grant period we made detailed studies of the dynamics of two level tunneling systems in glasses at very low temperature and by the application of AC and DC electric fields. Models have been developed that now account for both the formation and subsequent breaking of resonant tunneling pairs, and strongly bound pairs in a swept electric field. Perhaps most importantly, we saw a critical field in the polymeric glass Mylar, beyond which recovery following the application of a strong electric field is substantially modified from the predictions of current models. It was essential during the final grant period to see how general these new properties were by testing for them in a new and broader set of glasses. At the same time, the discovery that tunneling systems with nuclei possessing electric quadrupole moments that couple the TS behavior to magnetic fields was studied in this laboratory, using some of the probes that we alone employ. Finally, we were developing our own dielectric pulsed echo system, operating for the first time at the low energy splittings and hence temperatures at which interactions between TS are important. We combined this technique with the sudden application of both electric and strain …
Date:
January 10, 2013
Creator:
Osheroff, Douglas D.
Object Type:
Report
System:
The UNT Digital Library
Waste feed delivery planning at Hanford
The Integrated Waste Feed Delivery Plan (IWFDP) describes how waste feed will be delivered to the Waste Treatment and Immobilization Plant (WTP) to safely and efficiently accomplish the River Protection Project (RPP) mission. The IWFDP, which is integrated with the Baseline Case operating scenario, is comprised of three volumes. Volume 1 - Process Strategy provides an overview of waste feed delivery (WFD) and describes how the WFD system will be used to prepare and deliver feed to the WTP based on the equipment configuration and functional capabilities of the WFD system. Volume 2 - Campaign Plan describes the plans for the first eight campaigns for delivery to the WTP, evaluates projected feed for systematic issues, projects 242-A Evaporator campaigns, and evaluates double-shell tank (DST) space and availability of contingency feed. Volume 3 - Project Plan identifies the scope and timing of the DST and infrastructure upgrade projects necessary to feed the WTP, and coordinates over 30 projectized projects and operational activities that comprise the needed WFD upgrades.
Date:
January 10, 2013
Creator:
Certa, Paul J.; West, Elizha B.; Rodriguez, Juissepp S.; Hohl, Ted M.; Larsen, Douglas C.; Ritari, Jaakob S. et al.
Object Type:
Article
System:
The UNT Digital Library
Blending Of Radioactive Salt Solutions In Million Gallon Tanks
Research was completed at Savannah River National Laboratory (SRNL) to investigate processes related to the blending of radioactive, liquid waste, salt solutions in 4920 cubic meter, 25.9 meter diameter storage tanks. One process was the blending of large salt solution batches (up to 1135 ? 3028 cubic meters), using submerged centrifugal pumps. A second process was the disturbance of a settled layer of solids, or sludge, on the tank bottom. And a third investigated process was the settling rate of sludge solids if suspended into slurries by the blending pump. To investigate these processes, experiments, CFD models (computational fluid dynamics), and theory were applied. Experiments were performed using simulated, non-radioactive, salt solutions referred to as supernates, and a layer of settled solids referred to as sludge. Blending experiments were performed in a 2.44 meter diameter pilot scale tank, and flow rate measurements and settling tests were performed at both pilot scale and full scale. A summary of the research is presented here to demonstrate the adage that, ?One good experiment fixes a lot of good theory?. Experimental testing was required to benchmark CFD models, or the models would have been incorrectly used. In fact, CFD safety factors were established by …
Date:
December 10, 2012
Creator:
Leishear, Robert A.; Lee, Si Y.; Fowley, Mark D. & Poirier, Michael R.
Object Type:
Article
System:
The UNT Digital Library
Challenges of 4th Generation Light Sources
This report talks about Challenges of 4th Generation Light Sources
Date:
December 10, 2012
Creator:
Pellegrini, C.
Object Type:
Article
System:
The UNT Digital Library
Engineered Geothermal Systems Energy Return On Energy Investment
Energy Return On Investment (EROI) is an important figure of merit for assessing the viability of energy alternatives. Too often comparisons of energy systems use âefficiencyâ when EROI would be more appropriate. For geothermal electric power generation, EROI is determined by the electricity delivered to the consumer compared to the energy consumed to construct, operate, and decommission the facility. Critical factors in determining the EROI of Engineered Geothermal Systems (EGS) are examined in this work. These include the input energy embodied into the system. Embodied energy includes the energy contained in the materials, as well as, that consumed in each stage of manufacturing from mining the raw materials to assembling the finished system. Also critical are the system boundaries and value of the energy â heat is not as valuable as electrical energy. The EROI of an EGS depends upon a number of factors that are currently unknown, for example what will be typical EGS well productivity, as well as, reservoir depth, temperature, and temperature decline rate. Thus the approach developed is to consider these factors as parameters determining EROI as a function of number of wells needed. Since the energy needed to construct a geothermal well is a function …
Date:
December 10, 2012
Creator:
Mansure, A J
Object Type:
Report
System:
The UNT Digital Library
EXPERIMENTAL METHODS TO ESTIMATE ACCUMULATED SOLIDS IN NUCLEAR WASTE TANKS
The Department of Energy has a large number of nuclear waste tanks. It is important to know if fissionable materials can concentrate when waste is transferred from staging tanks prior to feeding waste treatment plants. Specifically, there is a concern that large, dense particles, e.g., plutonium containing, could accumulate in poorly mixed regions of a blend tank heel for tanks that employ mixing jet pumps. At the request of the DOE Hanford Tank Operations Contractor, Washington River Protection Solutions, the Engineering Development Laboratory of the Savannah River National Laboratory performed a scouting study in a 1/22-scale model of a waste tank to investigate this concern and to develop measurement techniques that could be applied in a more extensive study at a larger scale. Simulated waste tank solids and supernatant were charged to the test tank and rotating liquid jets were used to remove most of the solids. Then the volume and shape of the residual solids and the spatial concentration profiles for the surrogate for plutonium were measured. This paper discusses the overall test results, which indicated heavy solids only accumulate during the first few transfer cycles, along with the techniques and equipment designed and employed in the test. Those …
Date:
December 10, 2012
Creator:
Duignan, M.; Steeper, T. & Steimke, J.
Object Type:
Article
System:
The UNT Digital Library
Identification And Characterization Of The Solids Found In Extraction Contactor SEP-401 In June 2012
The Modular Caustic-Side Solvent Extraction Unit (MCU) recently conducted an outage that included maintenance on the centrifugal contactors. Operations personnel observed solids or deposits in two contactors and attempted to collect samples for analyses by Savannah River National Laboratory (SRNL). The residues found in Extraction Contactor SEP-401 are a mixture of amorphous silica, aluminosilicate, titanium, and debris from low alloy steel. The solids contain low concentrations of plutonium and strontium. These isotopes are associated with the titanium that came from the monosodium titanate (MST) added in the Actinide Removal Process (ARP) most likely as leached Ti from the MST that precipitated subsequently in MCU. An attempt was also made to obtain samples from the contents of Wash Contactor SEP-702. However, sampling provide ineffective.
Date:
December 10, 2012
Creator:
Fondeur, F. F. & Fink, S. D.
Object Type:
Report
System:
The UNT Digital Library
NIC Final Review November 13-14, 2012
None
Date:
December 10, 2012
Creator:
Nuckolls, J H
Object Type:
Report
System:
The UNT Digital Library
Nuclear imaging of the fuel assembly in ignition experiments
None
Date:
December 10, 2012
Creator:
Grim, G.; Guler, N.; Merrill, F.; Morgan, G.; Danly, C.; Volegov, P. et al.
Object Type:
Article
System:
The UNT Digital Library
Observation of Ion Acceleration and Heating during Collisionless Magnetic Reconnection in a Laboratory Plasma
The ion dynamics in a collisionless magnetic reconnection layer are studied in a laboratory plasma. The measured in-plane plasma potential profile, which is established by electrons accelerated around the electron diffusion region, shows a saddle-shaped structure that is wider and deeper towards the outflow direction. This potential structure ballistically accelerates ions near the separatrices toward the outflow direction. Ions are heated as they travel into the high pressure downstream region.
Date:
December 10, 2012
Creator:
Jongsoo Yoo, Masaaki Yamada, HantaoJi and Clayton E. Myers
Object Type:
Report
System:
The UNT Digital Library
On the Lack of Evolution in Galaxy Star Formation Efficiency
None
Date:
December 10, 2012
Creator:
Behroozi, Peter S.; Wechsler, Risa H.; /KIPAC, Menlo Park /SLAC; Conroy, Charlie & /UC, Santa Cruz, Astron. Astrophys.
Object Type:
Article
System:
The UNT Digital Library
Scalable Load Balancing for Massively Parallel Distributed Monte Carlo Particle Transport
None
Date:
December 10, 2012
Creator:
O'Brien, M. J.; Brantley, P. S. & Joy, K. I.
Object Type:
Article
System:
The UNT Digital Library