Serial/Series Title
Chemical Processing Department Monthly Report
15
Fiscal Year 2004
3
Fiscal Year 2005
3
Fiscal Year 2001
2
Fiscal Year 2007
2
Irradiation Processing Department Monthly Record Report
2
A Novel Membrane Reactor for Direct Hydrogen Production From Coal Progress Report
1
A Real-Time Coal Content/Ore Grade (C2OG) Sensor, Technical Report
1
BEETIT Program
1
Carbon Sequestration on Surface Mine Lands Quarterly Report
1
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Inadvertent Intruder Analysis For The Portsmouth On-Site Waste Disposal Facility (OSWDF)
The inadvertent intruder analysis considers the radiological impacts to hypothetical persons who are assumed to inadvertently intrude on the Portsmouth OSWDF site after institutional control ceases 100 years after site closure. For the purposes of this analysis, we assume that the waste disposal in the OSWDF occurs at time zero, the site is under institutional control for the next 100 years, and inadvertent intrusion can occur over the following 1,000 year time period. Disposal of low-level radioactive waste in the OSWDF must meet a requirement to assess impacts on such individuals, and demonstrate that the effective dose equivalent to an intruder would not likely exceed 100 mrem per year for scenarios involving continuous exposure (i.e. chronic) or 500 mrem for scenarios involving a single acute exposure. The focus in development of exposure scenarios for inadvertent intruders was on selecting reasonable events that may occur, giving consideration to regional customs and construction practices. An important assumption in all scenarios is that an intruder has no prior knowledge of the existence of a waste disposal facility at the site. Results of the analysis show that a hypothetical inadvertent intruder at the OSWDF who, in the worst case scenario, resides on the site …
Date:
January 22, 2014
Creator:
Smith, Frank G. & Phifer, Mark A.
Object Type:
Report
System:
The UNT Digital Library
Instrument Qualification of Custom Fabricated Water Activity Meter for Hot Cell Use
This report describes a custom fabricated water activity meter and the results of the qualification of this meter as described in the laboratory test plan LAB-PLN-11-00012, Testing and Validation of an Enhanced Acquisition and Control System. It was calibrated against several NaOH solutions of varying concentrations to quantify the accuracy and precision of the instrument at 20 °C and 60 °C. Also, a schematic and parts list of the equipment used to make the water activity meter will be presented in this report.
Date:
January 22, 2014
Creator:
McCoskey, Jacob K.
Object Type:
Report
System:
The UNT Digital Library
Coop Progress Report
None
Date:
November 22, 2013
Creator:
Rivera, Z Z & Bond, E
Object Type:
Report
System:
The UNT Digital Library
CSPAD-140k - A Versatile Detector for LCLS Experiments
None
Date:
November 22, 2013
Creator:
Herrmann, Sven; Boutet, Sebastian; Duda, Brian; Fritz, David; Haller, Gunther; Hart, Philip et al.
Object Type:
Article
System:
The UNT Digital Library
Summary Report of Ecological Risk Assessment for the Operation of the Explosives Waste Treatment Facility at Site 300 of the Lawrence Livermore National Laboratory.
None
Date:
November 22, 2013
Creator:
Gallegos, G M & Terusaki, S H
Object Type:
Report
System:
The UNT Digital Library
Final Report for Regulation of Embryonic Development in Higher Plants
The overall goal of the project was to define the cellular processes that underlie embryo development in plants at a mechanistic level. Our studies focused on a critical transcriptional regulator, Arabidopsis LEAFY COTYLEDON (LEC1), that is necessary and sufficient to induce processes required for embryo development. Because LEC1 regulates lipid accumulation during the maturation phase of embryo development, information about LEC1 may be useful in designing approaches to enhance biofuel production in plants. During the tenure of this project, we determined the molecular mechanisms by which LEC1 acts as a transcription factor in embryos. We also identified genes directly regulated by LEC1 and showed that many of these genes are involved in maturation processes. This information has been useful in dissecting the gene regulatory networks controlling embryo development. Finally, LEC1 is a novel isoform of a transcription factor that is conserved among eukaryotes, and LEC1 is active primarily in seeds. Therefore, we determined that the LEC1-type transcription factors first appeared in lycophytes during land plant evolution. Together, this study provides basic information that has implications for biofuel production.
Date:
October 22, 2013
Creator:
Harada, John J.
Object Type:
Report
System:
The UNT Digital Library
Investigation on the Core Bypass Flow in a Very High Temperature Reactor
Uncertainties associated with the core bypass flow are some of the key issues that directly influence the coolant mass flow distribution and magnitude, and thus the operational core temperature profiles, in the very high-temperature reactor (VHTR). Designers will attempt to configure the core geometry so the core cooling flow rate magnitude and distribution conform to the design values. The objective of this project is to study the bypass flow both experimentally and computationally. Researchers will develop experimental data using state-of-the-art particle image velocimetry in a small test facility. The team will attempt to obtain full field temperature distribution using racks of thermocouples. The experimental data are intended to benchmark computational fluid dynamics (CFD) codes by providing detailed information. These experimental data are urgently needed for validation of the CFD codes. The following are the project tasks: • Construct a small-scale bench-top experiment to resemble the bypass flow between the graphite blocks, varying parameters to address their impact on bypass flow. Wall roughness of the graphite block walls, spacing between the blocks, and temperature of the blocks are some of the parameters to be tested. • Perform CFD to evaluate pre- and post-test calculations and turbulence models, including sensitivity studies to …
Date:
October 22, 2013
Creator:
Hassan, Yassin
Object Type:
Report
System:
The UNT Digital Library
A New Pad-Based Neutron Detector for Stereo Coded Aperture Thermal Neutron Imaging
N/A
Date:
October 22, 2013
Creator:
Dioszegi, I.; Yu, B.; Smith, G.; Schaknowski, N.; Fried, J.; Vanier, P. E. et al.
Object Type:
Article
System:
The UNT Digital Library
Technology Validation of Fuel Cell Vehicles and Their Hydrogen Infrastructure
This presentation summarizes NREL's analysis and validation of fuel cell electric vehicles and hydrogen fueling infrastructure technologies.
Date:
October 22, 2013
Creator:
Sprik, S.; Kurtz, J.; Wipke, K.; Saur, G. & Ainscough, C.
Object Type:
Presentation
System:
The UNT Digital Library
Use of Virtual Frisch-Grid CdZnTe Detectors to Attain Sub-millimeter Spatial Resolution
N/A
Date:
October 22, 2013
Creator:
Lee, K.; Bolotnikov, A. E.; Bae, S.; Roy. N. U.; Camarda, G. S.; Petric, M. et al.
Object Type:
Article
System:
The UNT Digital Library
Analyses of Inspection Reports at Fuel Cycle Facilities to Derive Insights for a Significance Determination Process
N/A
Date:
September 22, 2013
Creator:
P., Samantha; V., Mubayi & Bari, R. A.
Object Type:
Article
System:
The UNT Digital Library
Approaches for Addressing Risks in Reprocessing Facilities: An Assessment
N/A
Date:
September 22, 2013
Creator:
G., Martinez-Guridi; V., Mubayi & Bari, R. A.
Object Type:
Article
System:
The UNT Digital Library
A RE-LOOK AT THE US NRC SAFETY GOALS
Since they were adopted in 1986, the US NRC’s Safety Goals have played a valuable role as a de facto risk acceptance criterion against which the predicted performance of a commercial nuclear power reactor can be evaluated and assessed. The current safety goals are cast in terms of risk metrics called quantitative health objectives (QHOs), limiting numerical values of the risks of the early and latent health effects of accidental releases of radioactivity to the offsite population. However, while demonstrating compliance with current safety goals has been an important step in assessing the acceptance of the risk posed by LWRs, new or somewhat different goals may be needed that go beyond the current early fatality and latent cancer fatality QHOs in assessing reactor risk. Natural phenomena such as hurricanes seem to be suitable candidates for establishing a background rate to derive a risk goal as their order of magnitude cost of damages is similar to those estimated in severe accident Level 3 PRAs done for nuclear power plants. This paper obtains a risk goal that could have a wider applicability, compared to the current QHOs, as a technology-neutral goal applicable to future reactors and multi-unit sites.
Date:
September 22, 2013
Creator:
v., mubayi
Object Type:
Article
System:
The UNT Digital Library
Active Flow Control on Bidirectional Rotors for Tidal MHK Applications
A marine and hydrokinetic (MHK) tidal turbine extracts energy from tidal currents, providing clean, sustainable electricity generation. In general, all MHK conversion technologies are confronted with significant operational hurdles, resulting in both increased capital and operations and maintenance (O&M) costs. To counter these high costs while maintaining reliability, MHK turbine designs can be simplified. Prior study found that a tidal turbine could be cost-effectively simplified by removing blade pitch and rotor/nacelle yaw. Its rotor would run in one direction during ebb and then reverse direction when the current switched to flood. We dubbed such a turbine a bidirectional rotor tidal turbine (BRTT). The bidirectional hydrofoils of a BRTT are less efficient than conventional hydrofoils and capture less energy, but the elimination of the pitch and yaw systems were estimated to reduce levelized cost of energy by 7.8%-9.6%. In this study, we investigated two mechanisms for recapturing some of the performance shortfall of the BRTT. First, we developed a novel set of hydrofoils, designated the yy series, for BRTT application. Second, we investigated the use of active flow control via microtabs. Microtabs are small deployable/retractable tabs, typically located near the leading or trailing edge of an air/hydrofoil with height on the …
Date:
August 22, 2013
Creator:
Shiu, Henry & van Dam, Cornelis P.
Object Type:
Report
System:
The UNT Digital Library
THE APPLICATION OF A STATISTICAL DOWNSCALING PROCESS TO DERIVE 21{sup ST} CENTURY RIVER FLOW PREDICTIONS USING A GLOBAL CLIMATE SIMULATION
The ability of water managers to maintain adequate supplies in coming decades depends, in part, on future weather conditions, as climate change has the potential to alter river flows from their current values, possibly rendering them unable to meet demand. Reliable climate projections are therefore critical to predicting the future water supply for the United States. These projections cannot be provided solely by global climate models (GCMs), however, as their resolution is too coarse to resolve the small-scale climate changes that can affect hydrology, and hence water supply, at regional to local scales. A process is needed to ‘downscale’ the GCM results to the smaller scales and feed this into a surface hydrology model to help determine the ability of rivers to provide adequate flow to meet future needs. We apply a statistical downscaling to GCM projections of precipitation and temperature through the use of a scaling method. This technique involves the correction of the cumulative distribution functions (CDFs) of the GCM-derived temperature and precipitation results for the 20{sup th} century, and the application of the same correction to 21{sup st} century GCM projections. This is done for three meteorological stations located within the Coosa River basin in northern Georgia, …
Date:
August 22, 2013
Creator:
Werth, D. & Chen, K. F.
Object Type:
Report
System:
The UNT Digital Library
Characterization of a megapixel CMOS charge dump and read camera
None
Date:
August 22, 2013
Creator:
Kimbrough, J R; Bell, P M; Datte, P S; Thao, M S; de Dios, E & Peters, A S
Object Type:
Article
System:
The UNT Digital Library
COLLABORATIVE RESEARCH:USING ARM OBSERVATIONS & ADVANCED STATISTICAL TECHNIQUES TO EVALUATE CAM3 CLOUDS FOR DEVELOPMENT OF STOCHASTIC CLOUD-RADIATION
The long-range goal of several past and current projects in our DOE-supported research has been the development of new and improved parameterizations of cloud-radiation effects and related processes, using ARM data, and the implementation and testing of these parameterizations in global models. The main objective of the present project being reported on here has been to develop and apply advanced statistical techniques, including Bayesian posterior estimates, to diagnose and evaluate features of both observed and simulated clouds. The research carried out under this project has been novel in two important ways. The first is that it is a key step in the development of practical stochastic cloud-radiation parameterizations, a new category of parameterizations that offers great promise for overcoming many shortcomings of conventional schemes. The second is that this work has brought powerful new tools to bear on the problem, because it has been a collaboration between a meteorologist with long experience in ARM research (Somerville) and a mathematician who is an expert on a class of advanced statistical techniques that are well-suited for diagnosing model cloud simulations using ARM observations (Shen).
Date:
August 22, 2013
Creator:
Somerville, Richard
Object Type:
Report
System:
The UNT Digital Library
Crystal Williams NNSA Essay
None
Date:
August 22, 2013
Creator:
Williams, C
Object Type:
Report
System:
The UNT Digital Library
Crystalline Ceramic Waste Forms: Comparison Of Reference Process For Ceramic Waste Form Fabrication
The research conducted in this work package is aimed at taking advantage of the long term thermodynamic stability of crystalline ceramics to create more durable waste forms (as compared to high level waste glass) in order to reduce the reliance on engineered and natural barrier systems. Durable ceramic waste forms that incorporate a wide range of radionuclides have the potential to broaden the available disposal options and to lower the storage and disposal costs associated with advanced fuel cycles. Assemblages of several titanate phases have been successfully demonstrated to incorporate radioactive waste elements, and the multiphase nature of these materials allows them to accommodate variation in the waste composition. Recent work has shown that they can be produced from a melting and crystallization process. The objective of this report is to explore the phase formation and microstructural differences between lab scale melt processing in varying gas environments with alternative densification processes such as Hot Pressing (HP) and Spark Plasma Sintering (SPS). The waste stream used as the basis for the development and testing is a simulant derived from a combination of the projected Cs/Sr separated stream, the Trivalent Actinide - Lanthanide Separation by Phosphorous reagent Extraction from Aqueous Komplexes (TALSPEAK) …
Date:
August 22, 2013
Creator:
Brinkman, K. S.; Marra, J. C.; Amoroso, J. & Tang, M.
Object Type:
Report
System:
The UNT Digital Library
Design and implementation of Dilation X-ray Imager for National Ignition Facility "DIXI"
None
Date:
August 22, 2013
Creator:
Ayers, M. J.; Bell, P. M.; Bradley, D.; Chung, M.; Felker, B.; Hares, J. et al.
Object Type:
Article
System:
The UNT Digital Library
Determination Of Reportable Radionuclides For DWPF Sludge Batch 7B (Macrobatch 9)
The Waste Acceptance Product Specifications (WAPS) 1.2 require that “The Producer shall report the inventory of radionuclides (in Curies) that have half-lives longer than 10 years and that are, or will be, present in concentrations greater than 0.05 percent of the total inventory for each waste type indexed to the years 2015 and 3115”. As part of the strategy to comply with WAPS 1.2, the Defense Waste Processing Facility (DWPF) will report for each waste type, all radionuclides (with half-lives greater than 10 years) that have concentrations greater than 0.01 percent of the total inventory from time of production through the 1100 year period from 2015 through 3115. The initial listing of radionuclides to be included is based on the design-basis glass as identified in the Waste Form Compliance Plan (WCP) and Waste Form Qualification Report (WQR). However, it is required that this list be expanded if other radionuclides with half-lives greater than 10 years are identified that may meet the greater than 0.01% criterion for Curie content. Specification 1.6 of the WAPS, International Atomic Energy Agency (IAEA) Safeguards Reporting for High Level Waste (HLW), requires that the ratio by weights of the following uranium and plutonium isotopes be reported: …
Date:
August 22, 2013
Creator:
Crawford, C. L. & DiPrete, D. P.
Object Type:
Report
System:
The UNT Digital Library
DHS HS-STEM Summer Report
None
Date:
August 22, 2013
Creator:
Patel, Y H; Conway, A M & Swanberg, E L
Object Type:
Report
System:
The UNT Digital Library
Electron-Mediated Relaxation Following Ultrafast Pumping of Strongly Correlated Materials: Model Evidence of a Correlation-Tuned Crossover between Thermal and Nonthermal States
None
Date:
August 22, 2013
Creator:
Moritz, B.; /SIMES, Stanford /SLAC /North Dakota U. /Northern Illinois U.; Kemper, A.F.; Sentef, M.; Devereaux, T.P.; /SIMES, Stanford /SLAC et al.
Object Type:
Article
System:
The UNT Digital Library
High Performance Cathodes for Li-Air Batteries
The overall objective of this project was to develop and fabricate a multifunctional cathode with high activities in acidic electrolytes for the oxygen reduction and evolution reactions for Li-air batteries. It should enable the development of Li-air batteries that operate on hybrid electrolytes, with acidic catholytes in particular. The use of hybrid electrolytes eliminates the problems of lithium reaction with water and of lithium oxide deposition in the cathode with sole organic electrolytes. The use of acid electrolytes can eliminate carbonate formation inside the cathode, making air breathing Li-air batteries viable. The tasks of the project were focused on developing hierarchical cathode structures and bifunctional catalysts. Development and testing of a prototype hybrid Li-air battery were also conducted. We succeeded in developing a hierarchical cathode structure and an effective bifunctional catalyst. We accomplished integrating the cathode with existing anode technologies and made a pouch prototype Li-air battery using sulfuric acid as catholyte. The battery cathodes contain a nanoscale multilayer structure made with carbon nanotubes and nanofibers. The structure was demonstrated to improve battery performance substantially. The bifunctional catalyst developed contains a conductive oxide support with ultra-low loading of platinum and iridium oxides. The work performed in this project has been …
Date:
August 22, 2013
Creator:
Xing, Yangchuan
Object Type:
Report
System:
The UNT Digital Library