Los Alamos National Laboratory Facilities, Security and Safeguards Division, Safeguards and Security Program Office, Protective Force Oversight Program (open access)

Los Alamos National Laboratory Facilities, Security and Safeguards Division, Safeguards and Security Program Office, Protective Force Oversight Program

The purpose of this document is to identify and describe the duties and responsibilities of Facility Security and Safeguards (FSS) Safeguards and Security (SS) organizations (groups/offices) with oversight functions over the Protection Force (PF) subcontractor. Responsible organizations will continue their present PF oversight functions under the Cost Plus Award Fee (CPAF) assessment, but now will be required to also coordinate, integrate, and interface with other FSS S and S organizations and with the PF subcontractor to measure performance, assess Department of Energy (DOE) compliance, reduce costs, and minimize duplication of effort. The role of the PF subcontractor is to provide the Laboratory with effective and efficient protective force services. PF services include providing protection for the special nuclear material, government property and classified or sensitive information developed and/or consigned to the Laboratory, as well as protection for personnel who work or participate in laboratory activities. FSS S and S oversight of both performance and compliance standards/metrics is essential for these PF objectives to be met.
Date: November 30, 1995
Creator: unknown
Object Type: Report
System: The UNT Digital Library
Alternative Technical Summary Report: Electrometallurgical Treatment Variant (open access)

Alternative Technical Summary Report: Electrometallurgical Treatment Variant

Immobilization is the fixation of the surplus fissile materials in an acceptable matrix such as glass or ceramics to create an environmentally benign form for disposal in a repository. In addition to the traditional characteristics required of an immobilization form to achieve isolation of the fissile material from the biosphere over geologic times, the immobilization form for the Fissile Materials Disposition Program (FMDP) must also possess the property that it is inherently as unattractive and inaccessible as the fissile material from commercial spent fuel. This latter requirement is similar to the wording of the ''spent fuel standard'' invoked in the National Academy of Sciences (NAS) study on plutonium disposition. High-level wastes (HLW) or separated cesium ({sup 137}Cs), can be added with the fissile material into the waste form to create a radiation field that increases the proliferation resistance and decreases reuse by the host nation in the following ways: (1) Plutonium will be diluted with elements that must be removed by extensive chemical processing to return it to weapons-usable purity; (2) The immobilized plutonium canisters will contain approximately 2 tonnes (2000 kg; 2.2 tons) of mass, thereby forcing the use of heavy equipment to move the canisters; (3) A gamma …
Date: November 30, 1995
Creator: Gray, L.W.
Object Type: Report
System: The UNT Digital Library
Co-firing high sulfur coal with refuse derived fuels. Technical progress report No. 5, [October--December 1995] (open access)

Co-firing high sulfur coal with refuse derived fuels. Technical progress report No. 5, [October--December 1995]

Studies involving the tubular furnace are in the process of identifying the ideal experimental coal-to-refuse derived fuel(RDF) ratio for use in the AFBC system. A series of experiments with this furnace has been performed to determine the possible chemical pathway for formation of chlorinated organic compounds during the combustion of various RDF sources. Phenol and chlorine appear to be likely reactants necessary for the formation of these compounds. The main goal of these experiment is to determine the exact experimental conditions for the formation of chlorinated organic compounds, as well as methods to inhibit their development. Work on the fluidized bed combustor has involved five combustion runs, in which a combustion efficiency of greater than 96% and with a consistent CO{sub 2} concentration of approximately 13% was obtained. Modifications responsible for these improvements include the addition of the underbed fuel feed system and revision of the flue gas sampling system. New methods of determining combustion efficiency and percentage of SO{sub 2} capture using TG techniques to analyze combustion products are being developed. The current outlook using this TGA/FTIR method is very promising, since previously obscured reactions are being studied. the analysis of combustion products is revealing a more complete picture …
Date: November 30, 1995
Creator: Pan, Wei-Ping; Riley, J. T. & Lloyd, W. G.
Object Type: Report
System: The UNT Digital Library
Considerations on the performance and fabrication of candidate materials for the Yucca Mountain repository waste packages highly corrosion resistant nickel-base and titanium-base alloys (open access)

Considerations on the performance and fabrication of candidate materials for the Yucca Mountain repository waste packages highly corrosion resistant nickel-base and titanium-base alloys

Among the metallurgical factors that affect the performance of a material in a given environment are alloy composition, alloy segregation, depletion of alloying elements, non-uniform microstructures, precipitation leading to an increase in susceptibility to corrosion as well as decreases in ductility, residual plastic deformation, and residual stresses. Precipitation often occurs preferentially at grain boundaries, causing depletion of critical elements in regions adjacent to these boundaries. Continuous grain-boundary precipitates can lead to drops in ductility and toughness. The presence of non-metallic inclusions, if excessive and/or segregated, can also cause embrittlement. Segregation of alloying elements can result in localized galvanic action. Depletion of alloying elements as well as segregation can result in reductions in the concentrations of critical elements below those necessary to resist localized corrosion. Segregation and alloy depletion can also facilitate precipitation that could lead to embrittlement.
Date: November 30, 1995
Creator: Dalder, E & Goldberg, A
Object Type: Report
System: The UNT Digital Library
DUSCOBS - a depleted-uranium silicate backfill for transport, storage, and disposal of spent nuclear fuel (open access)

DUSCOBS - a depleted-uranium silicate backfill for transport, storage, and disposal of spent nuclear fuel

A Depleted Uranium Silicate COntainer Backfill System (DUSCOBS) is proposed that would use small, isotopically-depleted uranium silicate glass beads as a backfill material inside storage, transport, and repository waste packages containing spent nuclear fuel (SNF). The uranium silicate glass beads would fill all void space inside the package including the coolant channels inside SNF assemblies. Based on preliminary analysis, the following benefits have been identified. DUSCOBS improves repository waste package performance by three mechanisms. First, it reduces the radionuclide releases from SNF when water enters the waste package by creating a local uranium silicate saturated groundwater environment that suppresses (1) the dissolution and/or transformation of uranium dioxide fuel pellets and, hence, (2) the release of radionuclides incorporated into the SNF pellets. Second, the potential for long-term nuclear criticality is reduced by isotopic exchange of enriched uranium in SNF with the depleted uranium (DU) in the glass. Third, the backfill reduces radiation interactions between SNF and the local environment (package and local geology) and thus reduces generation of hydrogen, acids, and other chemicals that degrade the waste package system. In addition, the DUSCOBS improves the integrity of the package by acting as a packing material and ensures criticality control for the …
Date: November 30, 1995
Creator: Forsberg, C. W.; Pope, R. B.; Ashline, R. C.; DeHart, M. D.; Childs, K. W. & Tang, J. S.
Object Type: Report
System: The UNT Digital Library
Feasibility study on consolidation of Fernald Environmental Management Project depleted uranium materials (open access)

Feasibility study on consolidation of Fernald Environmental Management Project depleted uranium materials

In 1991, the DOE made a decision to close the FMPC located in Fernald, Ohio, and end its production mission. The site was renamed FEMP to reflect Fernald`s mission change from uranium production to environmental restoration. As a result of this change, the inventory of strategic uranium materials maintained at Fernald by DOE DP will need to be relocated to other DOE sites. Although considered a liability to the Fernald Plant due to its current D and D mission, the FEMP DU represents a potentially valuable DOE resource. Recognizing its value, it may be important for the DOE to consolidate the material at one site and place it in a safe long-term storage condition until a future DOE programmatic requirement materializes. In August 1995, the DOE Office of Nuclear Weapons Management requested, Lockheed Martin Energy Systems (LMES) to assess the feasibility of consolidating the FEMP DU materials at the Oak Ridge Reservation (ORR). This feasibility study examines various phases associated with the consolidation of the FEMP DU at the ORR. If useful short-term applications for the DU fail to materialize, then long-term storage (up to 50 years) would need to be provided. Phases examined in this report include DU material …
Date: November 30, 1995
Creator: unknown
Object Type: Report
System: The UNT Digital Library
The Fernald Citizens Task Force: Shifting the focus (open access)

The Fernald Citizens Task Force: Shifting the focus

In August 1995, the Fernald Citizens Task Force provided the US Department of Energy (DOE), the Environmental Protection Agency (EPA), the Ohio EPA (OEPA), and FERMCO with cost-effective, iplementable recommendations for addressing Fernald`s most pressing issues. Fernald is now proceeding with an accelerated cleanup plan to make these recommendations reality. With its initial work plan complete, the Task Force confronted a new challenge: How to shift its focus from developing recommendations designed to influence Fernald`s Records of Decision to advising project managers during remedial design and remedial action. This paper reports on the experiences of the Task Force, the DOE, Fernald regulators, and FERMCO as the Task Force made this shift. In the process, the parties encountered issues involving work plan development, membership, organization, and support resource allocation. Lessons learned as these issues were resolved are summarized. The Fernald experience supports the conclusion that ``hands-on`` citizen involvement in government decision- making at a major environmental remediation site can effectively transition from one area of focus to another.
Date: November 30, 1995
Creator: Stegner, G.D.; Applegate, J.S.; Hoopes, J. & Sarno, D.
Object Type: Article
System: The UNT Digital Library
High-Resolution NMR of Quadrupolar Nuclei in the Solid State (open access)

High-Resolution NMR of Quadrupolar Nuclei in the Solid State

This dissertation describes recent developments in solid state nuclear magnetic resonance (NMR), for the most part involving the use of dynamic-angle spinning (DAS) NMR to study quadrupolar nuclei. Chapter 1 introduces some of the basic concepts and theory that will be referred to in later chapters, such as the density operator, product operators, rotations, coherence transfer pathways, phase cycling, and the various nuclear spin interactions, including the quadrupolar interaction. Chapter 2 describes the theory behind motional averaging experiments, including DAS, which is a technique where a sample is spun sequentially about two axis oriented at different angles with respect to the external magnetic field such that the chemical shift and quadrupolar anisotropy are averaged to zero. Work done on various rubidium-87 salts is presented as a demonstration of DAS. Chapter 3 explains how to remove sidebands from DAS and magic-angle spinning (MAS) experiments, which result from the time-dependence of the Hamiltonian under sample spinning conditions, using rotor-synchronized {pi}-pulses. Data from these experiments, known as DAH-180 and MAH-180, respectively, are presented for both rubidium and lead salts. In addition, the applicability of this technique to double rotation (DOR) experiments is discussed. Chapter 4 concerns the addition of cross-polarization to DAS (CPDAS). …
Date: November 30, 1995
Creator: Gann, Sheryl Lee
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Hydraulic test unit and plugs. Technical progress report No. 15 (open access)

Hydraulic test unit and plugs. Technical progress report No. 15

High pressure mechanical seal plugs were hydraulically tested for material and size improvements.
Date: November 30, 1995
Creator: unknown
Object Type: Report
System: The UNT Digital Library
Identification and evaluation of fluvial-dominated deltaic (Class I oil) reservoirs in Oklahoma. Quarterly technical progress report, July 1--September 30, 1995 (open access)

Identification and evaluation of fluvial-dominated deltaic (Class I oil) reservoirs in Oklahoma. Quarterly technical progress report, July 1--September 30, 1995

The Oklahoma Geological Survey (OGS), the Geo Information Systems department, and the School of Petroleum and Geological Engineering at the University of Oklahoma are engaged in a program to identify and address Oklahoma`s oil recovery opportunities in fluvial-dominated deltaic (FDD) reservoirs. This program includes the systematic and comprehensive collection and evaluation of information on all of Oklahoma`s FDD reservoirs and the recovery technologies that have been (or could be) applied to those reservoirs with commercial success. This data collection and evaluation effort will be the foundation for an aggressive, multifaceted technology transfer program that is designed to support all of Oklahoma`s oil industry, with particular emphasis on smaller companies and independent operators in their attempts to maximize the economic producibility of FDD reservoirs. Specifically, this project will identify all FDD oil reservoirs in the State; group those reservoirs into plays that have similar depositional origins; collect, organize and analyze all available data conduct characterization and simulation studies on selected reservoirs in each play; and implement a technology transfer program targeted to the operators of FDD reservoirs. Activities were focused primarily on technology transfer elements of the project. This included regional play analysis and mapping, geologic field studies, and reservoir modeling …
Date: November 30, 1995
Creator: Mankin, C. J. & Banken, M. K.
Object Type: Report
System: The UNT Digital Library
In-Plant Testing of a Novel Coal Cleaning Circuit Using Advanced Technologies. Technical Report, September 1--November 30, 1995 (open access)

In-Plant Testing of a Novel Coal Cleaning Circuit Using Advanced Technologies. Technical Report, September 1--November 30, 1995

A circuit utilizing hindered-bed classifiers, enhanced gravity concentrators and column flotation has been found to provide a highly efficient cleaning of fine coal in which both ash and total sulfur contents are significantly reduced while maximizing the recovery of coal. In this study, a circuit comprised of the three technologies will be tested in an operating preparation plant to evaluate circuit performance and to compare the performance with the current technologies used to treat fine coal. Prior to the in-plant testing, the effect of changing feed characteristics on the performance of the enhanced gravity concentrator was evaluated for process control purposes. During this reporting period, a {minus}16 mesh Illinois No. 6 coal sample containing about 30% ash and 8.0% total sulfur was collected from a refuse pond. The ash and total sulfur contents of the sample were depleted by withdrawing a controlled amount of tailings produced by the unit to determine the effect of changing feed compositions. It was found that higher combustible recovery values are achieved when the feed ash content is decreased and slightly lower product sulfur content values are obtained when the pyritic sulfur content in the feed is decreased. The lower total sulfur contents are most …
Date: November 30, 1995
Creator: Honaker, R. Q. & Reed, S.
Object Type: Report
System: The UNT Digital Library
Metallurgical examination of recovered copper jet particles (open access)

Metallurgical examination of recovered copper jet particles

A shaped charge (81 mm, 42{degrees}, OFHC copper cone) was fired into a ``soft` recovery bunker to allow metallurgical examination of recovered jet particles and the slug. The initial weight of the copper liner was 245 gm, of which 184 gm was recovered. The number of jet particles recovered was 37 (approximately 63% of the particles formed by the charge). Extensive metallurgical analyses were performed on the recovered slug and jet particles. The microstructural features associated with voids, e.g. dendritic grain growth, clearly indicate that the regions in the vicinity of the centerline of the slug and jet particles were melted. In this work we present calculations of jet temperature as a function of constitutive behavior. In order to predict melt in the center region of the jet we find it necessary to scale flow stress with a pressure dependent shear modulus.
Date: November 30, 1995
Creator: Lassila, D. H.; Nikkel, Jr. D. J.; Kershaw, R. P. & Walters, W. P.
Object Type: Article
System: The UNT Digital Library
Refurbish power supply/distribution system, Phase 2, Y-12 Plant, Oak Ridge. Progress status report number 51 (open access)

Refurbish power supply/distribution system, Phase 2, Y-12 Plant, Oak Ridge. Progress status report number 51

This is a report on the phase 2 of refurbishing power supply/distribution system at Y-12 Plant, Oak Ridge, TN. The report topics include accomplishments by work breakdown structure (WBS) identifier, identification of items issued and items received, past due items, items requested, a milestone schedule by WBS and including a drawing list showing percent complete, and conference summaries.
Date: November 30, 1995
Creator: unknown
Object Type: Report
System: The UNT Digital Library
SCOPING EVALUATION TO EXPLORE-ROCK FALL FINITE-ELEMENT ANALYSIS AND ANALYTICAL EVALUATONS ON INTERLOCKING BASKET WASTE PACKAGES (open access)

SCOPING EVALUATION TO EXPLORE-ROCK FALL FINITE-ELEMENT ANALYSIS AND ANALYTICAL EVALUATONS ON INTERLOCKING BASKET WASTE PACKAGES

None
Date: November 30, 1995
Creator: Ceylan, Z.
Object Type: Report
System: The UNT Digital Library
Sharing of Rensselaer Polytechnic Institute Reactor Critical Facility (RCF) (open access)

Sharing of Rensselaer Polytechnic Institute Reactor Critical Facility (RCF)

The RPI Reactor Critical Facility (RCF) operated successfully over the period fall 1994 - fall 1995. During this period, the RCF was used for Critical Reactor Laboratory spring 1995 (12 students); Reactor Operations Training fall 1994 (3 students); Reactor Operations Training spring 1995 (3 students); and Reactor Operations Training fall 1995 (3 students). Thirty-two Instrumentation and Measurement students used the RCF for one class for hands-on experiments with nuclear instruments. In addition, a total of nine credits of PhD thesis work were carried out at the RCF. This document constitutes the 1995 Report of the Rensselaer Polytechnic Institute`s Reactor Critical Facility (RCF) to the USNRC, to the USDOE, and to RPI management.
Date: November 30, 1995
Creator: unknown
Object Type: Report
System: The UNT Digital Library
Winter Fuels Report: Week Ending November 24, 1995 (open access)

Winter Fuels Report: Week Ending November 24, 1995

The Winter Fuels Report is intended to provide concise, timely information to the industry, the press, policymakers, consumers, analysts, and State and local governments on the following topics: distillate fuel oil net production, imports and stocks on a US level and for all Petroleum Administration for Defense Districts (PADD) and product supplied on a US level; propane net production, imports and stocks on a US level and for PADD`s I, II, and III; natural gas supply and disposition and underground storage for the US and consumption for all PADD`s; as well as selected National average prices. Residential and wholesale pricing data for heating oil and propane for those States participating in the joint Energy Information Administration (EIA)/State Heating Oil and Propane Program; crude oil and petroleum price comparisons for the US and selected cities; and a 6-10 Day and 30-Day outlook for temperature and precipitation and US total heating degree-days by city.
Date: November 30, 1995
Creator: unknown
Object Type: Report
System: The UNT Digital Library
Comprehensive supernate treatment: Task summary (open access)

Comprehensive supernate treatment: Task summary

None
Date: November 29, 1995
Creator: Egan, B. Z.; Collins, J. L.; Anderson, K. K. & Chase, C. W.
Object Type: Report
System: The UNT Digital Library
Development and testing of inorganic sorbents made by the internal gelation process for radionuclide and heavy metal separations (open access)

Development and testing of inorganic sorbents made by the internal gelation process for radionuclide and heavy metal separations

The objectives of this task are to develop, prepare, and test microspheres and granular forms of inorganic ion exchangers to remove radionuclides and heavy metals from waste streams occurring at various sites. Several inorganic materials, such as hexacyanoferrates, titanates, phosphates, and oxides have high selectivities and efficiencies for separating and removing radionuclides such as uranium, technetium, cesium, and strontium, and metals such as cobalt, silver, zinc, and zirconium from aqueous waste streams. However, these sorbents frequently exist only as powders and consequently are not readily adaptable to continuous processing such as column chromatography. Making these inorganic ion exchangers as microspheres or granular forms improves the flow dynamics for column operations and expands their practical applications. Microspheres of several materials have been prepared at ORNL, and the effectiveness of zirconium monohydrogen phosphate and hydrous titanium oxide microspheres for removing radionuclides from hot cell waste solutions has been demonstrated.
Date: November 29, 1995
Creator: Egan, B. Z.; Collins, J. L.; Anderson, K. K. & Chase, C. W.
Object Type: Article
System: The UNT Digital Library
Enhanced tensile ductility in Al-Mg alloys by solid-solution interactions (open access)

Enhanced tensile ductility in Al-Mg alloys by solid-solution interactions

The development of methods for obtaining high tensile elongation in aluminum alloys is of great importance for the practical forming of near-net-shape parts. Current superplastic alloys are limited in use by high material costs. The utilization of solute-drag creep processes, the approach used in this study, to obtain enhanced tensile ductility in aluminum alloys has lead to tensile elongations of up to 325% in simple, binary Al-Mg alloys with coarse grain sizes. This method has the advantage of lowering processing costs in comparison with superplastic alloys because a fine grain size is not necessary. Whereas superplastic alloys typically have a strain-rate sensitivity of m = 0.5, the enhanced ductility Al-Mg alloys typically exhibit m = 0.3 where maximum ductility is observed. Although a strain-rate sensitivity of rn = 0.5 can lead to elongations of over 1000% (superplastic materials) a value of m = 0.3 is shown experimentally to be sufficient for obtaining elongations of 150% to a maximum observed of 325%. Enhanced ductility is also affected strongly by ternary alloying additions, such as Mn, for which a preliminary understanding is pursued.
Date: November 29, 1995
Creator: Taleff, E. M.; Henshall, G. A.; Lesuer, D. R.; Nieh, T. G. & Wadsworth, J.
Object Type: Article
System: The UNT Digital Library
High-efficiency, dielectric multilayer gratings optimized for manufacturability and laser damage threshold (open access)

High-efficiency, dielectric multilayer gratings optimized for manufacturability and laser damage threshold

Ultrashort pulse, high-intensity lasers offer new opportunities for the study of light-matter interaction and for inertial confinement fusion. A 100 Terawatt laser operating 400 fs and 1.053 {mu}m is operational at LLNL, and a 1000 Terawatt (Petawatt) laser will come online in early 1996. These lasers use large-aperture (40 cm and 94 cm diameter, respectively) diffraction gratings to compress the amplified laser pulse. At present, hologrphically produced, gold overcoated photoresist gratings are used: these gratings represent the fuse in the laser chain. Higher laser damage thresholds and higher diffraction efficiencies are theoretically possible with multilayer dielectric gratings (MDG`s). A number of design parameters regarding both the multilayer stack and the etched grating structure can be optimized to maximize the laser damage threshold and also improve the processing latitude for the interference lithography and reactive ion etching steps used during manufacture of these gratings. This paper presents model predictions for the behavior of hafnia/silica MDG`s both during processing and in operation, and presents experimental data on the diffraction efficiency and short- pulse laser damage threshold for optimized witness gratings.
Date: November 29, 1995
Creator: Britten, J. A.; Perry, M. D.; Shore, B. W.; Boyd, R. D.; Loomis, G. E. & Chow, R.
Object Type: Article
System: The UNT Digital Library
I: Low Frequency NMR and NQR Using a dc SQUID. II: Variable-temperature 13C CP/MAS of Organometallics (open access)

I: Low Frequency NMR and NQR Using a dc SQUID. II: Variable-temperature 13C CP/MAS of Organometallics

NMR and NQR at low frequencies are difficult prospects due to small nuclear spin polarization. Furthermore, the sensitivity'of the inductive pickup circuitry of standard spectrometers is reduced as the frequency is lowered. I have used a cw-SQUID (Superconducting QUantum Interference Device) spectrometer, which has no such frequency dependence, to study the local atomic environment of {sup 14}N via the quadrupolar interaction. Because {sup 14}N has spin I = 1 and a 0-6 MHz frequency range, it is not possible to obtain well-resolved spectra in high magnetic fields. I have used a technique to observe {sup 14}N NQR resonances via their effect on neighboring protons mediated by the heteronuclear dipolar interaction to study peptides and narcotics. The sensitivity of the SQUID is not enough to measure low-frequency surface (or other low spin density) systems. The application of spin-polarized xenon has been previously used to enhance polarization in conventional NMR experiments. Because xenon only polarizes spins with which it is in contact, it is surface selective. While differences in chemical shifts between surface and bulk spins are not large, it is expected that the differences in quadrupole coupling constant should be very large due to the drastic change of the electric field …
Date: November 29, 1995
Creator: Ziegeweid, M.A.
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Conversion of plutonium scrap and residue to boroilicate glass using the GMODS process (open access)

Conversion of plutonium scrap and residue to boroilicate glass using the GMODS process

Plutonium scrap and residue represent major national and international concerns because (1) significant environmental, safety, and health (ES&H) problems have been identified with their storage; (2) all plutonium recovered from the black market in Europe has been from this category; (3) storage costs are high; and (4) safeguards are difficult. It is proposed to address these problems by conversion of plutonium scrap and residue to a CRACHIP (CRiticality, Aerosol, and CHemically Inert Plutonium) glass using the Glass Material Oxidation and Dissolution System (GMODS). CRACHIP refers to a set of requirements for plutonium storage forms that minimize ES&H concerns. The concept is several decades old. Conversion of plutonium from complex chemical mixtures and variable geometries into a certified, qualified, homogeneous CRACHIP glass creates a stable chemical form that minimizes ES&H risks, simplifies safeguards and security, provides an easy-to-store form, decreases storage costs, and allows for future disposition options. GMODS is a new process to directly convert metals, ceramics, and amorphous solids to glass; oxidize organics with the residue converted to glass; and convert chlorides to borosilicate glass and a secondary sodium chloride stream. Laboratory work has demonstrated the conversion of cerium (a plutonium surrogate), uranium (a plutonium surrogate), Zircaloy, stainless steel, …
Date: November 28, 1995
Creator: Forsberg, C. W.; Beahm, E. C.; Parker, G. W.; Rudolph, J.; Elam, K. R. & Ferrada, J. J.
Object Type: Article
System: The UNT Digital Library
A distributed activation energy model of heterogeneous coal ignition. Final report, September 1, 1994--August 31, 1995 (open access)

A distributed activation energy model of heterogeneous coal ignition. Final report, September 1, 1994--August 31, 1995

We present a model which simulates the conventional tube-furnace experiment used for ignition studies. The Distributed Activation Energy Model of Ignition accounts for particle-to particle variations in reactivity by having a single preexponential factor and a Gaussian distribution of activation energies among the particles. The results show that the model captures the key experimental observations, namely (1) the linear increase in ignition frequency with increasing gas temperature, and (2) the variation of the slope of the ignition frequency with oxygen concentration. It is shown that adjustments to the model parameters permit a good fit to experimental data.
Date: November 28, 1995
Creator: Chen, J. C.
Object Type: Report
System: The UNT Digital Library
Electric power annual 1994. Volume 2, Operational and financial data (open access)

Electric power annual 1994. Volume 2, Operational and financial data

This year, the annual is published in two volumes. Volume I focused on US electric utilities and contained final 1994 data on net generation, fossil fuel consumption, stocks, receipts, and cost. This Volume II presents annual 1994 summary statistics for the electric power industry, including information on both electric utilities and nonutility power producers. Included are preliminary data for electric utility retail sales of electricity, associated revenue, and average revenue per kilowatthour of electricity sold (based on form EIA-861) and for electric utility financial statistics, environmental statistics, power transactions, and demand- side management. Final 1994 data for US nonutility power producers on installed capacity and gross generation, as well as supply and disposition information, are also provided in Volume II. Technical notes and a glossary are included.
Date: November 28, 1995
Creator: unknown
Object Type: Report
System: The UNT Digital Library