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1 - 24 of
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1-Dimensional simulation of thermal annealing in a commercial nuclear power plant reactor pressure vessel wall section
The objective of this work was to provide experimental heat transfer boundary condition and reactor pressure vessel (RPV) section thermal response data that can be used to benchmark computer codes that simulate thermal annealing of RPVS. This specific protect was designed to provide the Electric Power Research Institute (EPRI) with experimental data that could be used to support the development of a thermal annealing model. A secondary benefit is to provide additional experimental data (e.g., thermal response of concrete reactor cavity wall) that could be of use in an annealing demonstration project. The setup comprised a heater assembly, a 1.2 in {times} 1.2 m {times} 17.1 cm thick [4 ft {times} 4 ft {times} 6.75 in] section of an RPV (A533B ferritic steel with stainless steel cladding), a mockup of the {open_quotes}mirror{close_quotes} insulation between the RPV and the concrete reactor cavity wall, and a 25.4 cm [10 in] thick concrete wall, 2.1 in {times} 2.1 in [10 ft {times} 10 ft] square. Experiments were performed at temperature heat-up/cooldown rates of 7, 14, and 28{degrees}C/hr [12.5, 25, and 50{degrees}F/hr] as measured on the heated face. A peak temperature of 454{degrees}C [850{degrees}F] was maintained on the heated face until the concrete wall …
Date:
November 1, 1994
Creator:
Nakos, J. T.; Rosinski, S. T. & Acton, R. U.
Object Type:
Report
System:
The UNT Digital Library
500 MW demonstration of advanced wall-fired combustion techniques for the reduction of nitrogen oxide emissions from coal-fired boilers
This paper discusses the technical progress of a US Department of Energy Innovative Clean Coal Technology project demonstrating advanced wall-fired combustion techniques for the reduction of nitrogen oxide (NOx) emissions from coal-fired boilers. The primary objective of the demonstration is to determine the long-term NOx reduction performance of advanced overfire air (AOFA), low NOx burners (LNB), and advanced digital control/optimization methodologies applied in a stepwise fashion to a 500 MW boiler. The focus of this paper is to (1) present final results from the AOFA, LNB, and LNB + AOFA test phases and (2) provide an overview of the advanced digital control/optimization methods scheduled for demonstration starting fall 1994. Results from various LNB and AOFA testing and optimization efforts over a four year period provided a progressive improvement in emissions performance as operating and technical familiarity increased.
Date:
November 1, 1994
Creator:
Sorge, John N. & Wilson, Steve M.
Object Type:
Report
System:
The UNT Digital Library
14th Annual international meeting of wind turbine test stations: Proceedings
These proceedings are of the 14th Annual International Meeting of Test Stations. As the original charter states these meetings are intended to be an international forum for sharing wind turbine testing experiences. By sharing their experiences they can improve testing skills and techniques. As with all new industries the quality of the products is marked by how well they learn from their experiences and incorporate this learning into the next generation of products. The test station`s role in this process is to provide accurate information to the companies they serve. This information is used by designers to conform and improve their designs. It is also used by certification agencies for confirming the quality of these designs. By sharing of experiences they are able to accomplished these goals, serve these customers better and ultimately improve the international wind energy industry.
Date:
November 1, 1994
Creator:
unknown
Object Type:
Article
System:
The UNT Digital Library
1993 annual final progress report: July 1992 through June 1993
This is the first annual report since the Inauguration of the University Center of Excellence for Photovoltaics Research and Development (UCEP) at Georgia Tech. The essential objective of the Center is to improve the fundamental understanding of the science and technology of advanced PV devices and materials, to provide training and enrich the educational experience of students in the field, and to increase US competitiveness by providing guidelines to industry and DOE for achieving cost-effective and high efficiency PV devices. These objectives are to be accomplished through a combination of research and education. This report summarizes the technical accomplishments, including modeling, processing, and characterization of cast multicrystalline silicon solar cells; use of modeling and PCD measurements to develop a road map for progressing toward 20% multicrystalline and 25% single crystalline cells; the development of a novel PECVD SiN/SiO{sub 2} AR coating that also provides good surface passivation; PECVD deposited SiO{sub 2} films with record low S and D{sub it} at the SiO{sub 2}/Si interface; and educational activities and accomplishments.
Date:
November 1, 1994
Creator:
Rohatgi, A.; Crotty, G.; Chen, Z.; Sana, P.; Salami, J.; Doolittle, A. et al.
Object Type:
Report
System:
The UNT Digital Library
1993 environmental monitoring report for the naval reactors facility
The results of the radiological and nonradiological environmental monitoring programs for 1993 at the Naval Reactors Facility (NRF) are presented in this report. The results obtained from the environmental monitoring programs verify that releases to the environment from operations at NRF were in accordance with state and federal regulations. Evaluation of the environmental data confirms that the operation of NRF continues to have no adverse effect on the quality of the environment or the health and safety of the general public. Furthermore, a conservative assessment of radiation exposure to the general public as a result of NRF operations demonstrated that the dose received by any member of the public was well below the most restrictive dose limits prescribed by the Environmental Protection Agency (EPA) and the Department of Energy (DOE).
Date:
November 1, 1994
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
1993 Site environmental report Sandia National Laboratories, Albuquerque, New Mexico
This 1993 report contains monitoring data from routine radiological and nonradiological environmental surveillance activities. Summaries of significant environmental compliance programs in progress, such as National Environmental Policy Act documentation, environmental permits, environmental restoration, and various waste management programs for Sandia National Laboratories in Albuquerque, New Mexico, are included. The maximum offsite dose impact was calculated to be 0.0016 millirem. The total population within a 50-mile (80 kilometer) radius of Sandia National Laboratories/New Mexico received an estimated collective dose of 0.027 person-rem during 1993 from the laboratories operations, As in the previous year, the 1993 operations at Sandia National Laboratories/New Mexico had no discernible impact on the general public or on the environment. This report is prepared for the U.S. Department of Energy in compliance with DOE Order 5400.1.
Date:
November 1, 1994
Creator:
Culp, T. A.; Cheng, C. F.; Cox, W.; Durand, N.; Irwin, M.; Jones, A. et al.
Object Type:
Report
System:
The UNT Digital Library
1993 Site Environmental Report Tonopah Test Range, Tonopah, Nevada
This report summarizes the environmental surveillance activities conducted by Sandia National Laboratories, the US Environmental Protection Agency, and Reynolds Electrical and Engineering Company for the Tonopah Test Range operated by Sandia National Laboratories. Sandia National Laboratories` responsibility for environmental monitoring results extend to those activities performed by Sandia National Laboratories or under its direction. Results from other environmental monitoring activities are included to provide a measure of completeness in reporting. Other environmental compliance programs such as the National Environmental Policy Act of 1969, environmental permits, and environmental restoration and waste management programs are also included in this report, prepared for the US Department of Energy in compliance with DOE Order 5400.1.
Date:
November 1994
Creator:
Culp, T.; Howard, D. & McClellan, Y.
Object Type:
Report
System:
The UNT Digital Library
The 1994 Fermilab Fixed Target Program
This paper highlights the results of the Fermilab Fixed Target Program that were announced between October, 1993 and October, 1994. These results are drawn from 18 experiments that took data in the 1985, 1987 and 1990/91 fixed target running periods. For this discussion, the Fermilab Fixed Target Program is divided into 5 major topics: hadron structure, precision electroweak measurements, heavy quark production, polarization and magnetic moments, and searches for new phenomena. However, it should be noted that most experiments span several subtopics. Also, measurements within each subtopic often affect the results in other subtopics. For example, parton distributions from hadron structure measurements are used in the studies of heavy quark production.
Date:
November 1, 1994
Creator:
Conrad, J.
Object Type:
Article
System:
The UNT Digital Library
Abilene Philharmonic Playbill: November 12, 1994
Program for an Abilene Philharmonic concert that ran from November 12th to December 10th during the 45th season. It includes information about the pieces performed, artists and musicians, and advertising from local companies.
Date:
November 1994
Creator:
Abilene Philharmonic
Object Type:
Pamphlet
System:
The Portal to Texas History
Abiotic reduction of aquifer materials by dithionite: A promising in-situ remediation technology
Laboratory batch and column experiments were conducted with Hanford sediments to develop the capability to predict (1) the longevity of dithionite in these systems, (2) its efficiency as a reductant of structural iron, and (3) the longevity and reactivity of the reduced iron with soluble inorganic and organic species. After an initial induction period, the loss of dithionite by disproportionation and oxidation could be described by pseudo-first-order (PFO) kinetics. Other than the initial reaction with ferric iron, the primary factor promoting loss of dithionite in this system was disproportion nation via heterogeneous catalysis at mineral surfaces. The efficiency of the reduction of structural iron was nearly 100% for the first fourth of the ferric iron, but declined exponentially with higher degrees of reduction so that 75% of the ferric iron could be reduced. This decrease in reduction efficiency probably was related to differences in the accessibility of ferric iron in the mineral particles, with iron in clay-sized particles being the most accessible and that in silt- and sand-sized particles less accessible. Flow-through column studies showed that a reduced-sediment barrier created in this manner could maintain a reducing environment.
Date:
November 1, 1994
Creator:
Amonette, J. E.; Szecsody, J. E.; Schaef, H. T.; Gorby, Y. A.; Fruchter, J. S. & Templeton, J. C.
Object Type:
Report
System:
The UNT Digital Library
Absolute wavefront measurements of high-energy laser beams in the Beamlet Demonstration Project for the National Ignition Facility
The authors measure the absolute wavefront of Beamlet output pulses and actively correct for slowly varying aberrations present when the power amplifiers are not fired. Provision is also made for active precompensation of pump-induced amplifier aberrations.
Date:
November 1, 1994
Creator:
Salmon, J. T.; Bliss, E. S.; Kartz, M. W. & Van Wonterghem, B. M.
Object Type:
Article
System:
The UNT Digital Library
Absorption of laser light in overdense plasmas by sheath inverse bremsstrahlung
The original sheath inverse bremsstrahlung model [P. J. Catto and R. M. More, 1977] is modified by including the vxB term in the equation of motion. It is shown that the present results axe significantly different from those derived without the vxB term. The vxB term is also important in interpreting the absorption mechanism. If the vxB term were neglected, the absorption of the light would be incorrectly interpreted as an increase in the transverse electron temperature. This would violate the conservation of the transverse components of the canonical momentum, in the case of a normally incident laser light. It is also shown that both the sheath inverse bremsstrahlung and the anomalous skin effect are limiting cases of the same collisionless absorption mechanism. Finally, results from PIC plasma simulations are compared with the absorption coefficient calculated from the linear theory.
Date:
November 1, 1994
Creator:
Yang, T.Y.B.; Kruer, W.L. & More, R.M.
Object Type:
Article
System:
The UNT Digital Library
Accelerated safety analyses - structural analyses Phase I - structural sensitivity evaluation of single- and double-shell waste storage tanks
Accelerated Safety Analyses - Phase I (ASA-Phase I) have been conducted to assess the appropriateness of existing tank farm operational controls and/or limits as now stipulated in the Operational Safety Requirements (OSRs) and Operating Specification Documents, and to establish a technical basis for the waste tank operating safety envelope. Structural sensitivity analyses were performed to assess the response of the different waste tank configurations to variations in loading conditions, uncertainties in loading parameters, and uncertainties in material characteristics. Extensive documentation of the sensitivity analyses conducted and results obtained are provided in the detailed ASA-Phase I report, Structural Sensitivity Evaluation of Single- and Double-Shell Waste Tanks for Accelerated Safety Analysis - Phase I. This document provides a summary of the accelerated safety analyses sensitivity evaluations and the resulting findings.
Date:
November 1, 1994
Creator:
Becker, D. L.
Object Type:
Report
System:
The UNT Digital Library
Accelerated screening methods for predicting lubricant performance in refrigerant compressors: Final report
The tribological characteristics of various lubricant/refrigerant mixtures have been experimentally investigated by means of a unique high pressure tribometer (HPT). In order to identify more effective bench testers for screening lubricants for compressors, a comparison is made between data obtained from the HPT, Four Ball and Falex{trademark} testers, and those obtained from accelerated component (compressor) tests. Part 1 of this study is geared toward a comparison between data obtained from a Falex specimen tester and those obtained by the HPT. The main purpose of this comparison was to determine if the controlled environment and the lower loads used with the HPT produce different rankings than those obtained from the Falex tests. The results obtained from the HPT gave a consistent ranking a different loads and speeds and this ranking did not always correlate with that obtained from the Falex tester. In Part 2, the HPT is used to approximately simulate specific critical contacts in compressors to determine the degree to which it could predict lubricant performance. A comparison is made between data obtained from component tests and those obtained from the HPT. For comparison purposes, each lubricant is also tested and ranked based on results obtained in an air environment …
Date:
November 1, 1994
Creator:
Cusano, C.; Yoon, H. & Poppe, C.
Object Type:
Report
System:
The UNT Digital Library
Accelerator-driven assembly for plutonium transformation (ADAPT)
A particle accelerator-driven spallation target and corresponding blanket region are proposed for the ultimate disposition of weapons-grade plutonium being retired from excess nuclear weapons in the US and Russia. The highly fissile plutonium is contained within .25 to .5 cm diameter silicon-carbide coated graphite beads, which are cooled by helium, within the slightly subcritical blanket region. Major advantages include very high one-pass burnup (over 90 %), a high integrity waste form (the coated beads), and operation in a subcritical mode, thereby minimizing the vulnerability to the positive reactivity feedbacks often associated with plutonium fuel.
Date:
November 1, 1994
Creator:
Van Tuyle, G. J.; Todosow, M.; Powell, J. & Schweitzer, D.
Object Type:
Article
System:
The UNT Digital Library
Accelerator-driven molten-salt blankets: Physics issues
None
Date:
November 1, 1994
Creator:
Houts, M. G.; Beard, C. A.; Buksa, J. J.; Davidson, J. W.; Durkee, J. W.; Perry, R. T. et al.
Object Type:
Article
System:
The UNT Digital Library
An accelerator technology legacy
Accelerator technology has been a major beneficiary of the investment made over the last decade. It is the intention of this paper to provide the reader with a glimpse of the broad nature of those advances. Development has been on a broad front and this paper can highlight only a few of those. Two spin-off applications will be outlined -- a concept for a compact, active, beam probe for solar body exploration and the concept for an accelerator-driven transmutation system for energy production.
Date:
November 1, 1994
Creator:
Heighway, E. A.
Object Type:
Article
System:
The UNT Digital Library
Acceptance/operational test procedure 103-SY tank camera purge control system
This Acceptance/Operational Test Procedure will document the satisfactory operation of the 103-SY Camera Purge Control System.
Date:
November 1994
Creator:
Castleberry, Jim L.
Object Type:
Report
System:
The UNT Digital Library
Acceptance test procedure, 241-SY-101/241-C-106 shot loading system
This Acceptance Test Procedure is for the 241-SY-101/241-C-106 Shot Loading System. The procedure will test the components of the Shot Loading System and its capability of adequately loading shot into the annular space of the Container. The loaded shot will provide shielding as required for transporting and storage of a contaminated pump after removal from the tank. This test serves as verification that the SLS is acceptable for use in the pump removal operations for Tanks 241-SY-101, 241-C-106 and 241-AY-102. The pump removal operation for these three tanks will be performed by two different organizations with different equipment, but the Shot Loading System will be compatible between the two operations.
Date:
November 1, 1994
Creator:
Ostrom, M. J.
Object Type:
Report
System:
The UNT Digital Library
Accurate determination of transparency current in packaged semiconductor lasers and semiconductor optical amplifiers
The reliability of semiconductor laser diodes and related devices is a significant issue for their deployment in many applications, creating demand for device diagnostics applicable to packaged devices. Measurements of the transparency current density (J{sub 0}) in laser diodes and traveling-wave semiconductor optical amplifiers (SOAs) can provide such a diagnostic. It is essential, however, to measure J{sub 0} on packaged devices, so that they can be characterized after aging or degradation. This precludes techniques requiring data from multiple devices (e.g., an ensemble with different lengths). J{sub 0} is conventionally measured using a junction-voltage technique, in which an input optical signal induces a change in carrier density in the active region due to stimulated absorption or emission. The result is a voltage drop across the diode. At material transparency, the stimulated absorption is exactly balanced by the stimulated emission and the voltage drop goes to zero. Since the polarity of the voltage drop changes sign at current densities above J{sub 0}, the optical input beam is typically modulated and lock-in amplification is employed to sensitively detect the polarity sign flip. Here we show that this technique is not reliable for certain types of laser structures, because the deduced J{sub 0} is …
Date:
November 1, 1994
Creator:
Patterson, F. G.; Dijaili, S. P. & Deri, R. J.
Object Type:
Article
System:
The UNT Digital Library
Actinide behavior in the Integral Fast Reactor. Final project report
The Integral Fast Reactor (IFR) under development by Argonne National Laboratory uses metallic fuels instead of ceramics. This allows electrorefining of spent fuels and presents opportunities for recycling minor actinide elements. Four minor actinides ({sup 237}Np, {sup 240}Pu, {sup 241}Am, and {sup 243}Am) determine the waste storage requirements of spent fuel from all types of fission reactors. These nuclides behave the same as uranium and other plutonium isotopes in electrorefining, so they can be recycled back to the reactor without elaborate chemical processing. An experiment has been designed to demonstrate the effectiveness of the high-energy neutron spectra of the IFR in consuming these four nuclides and weapons grade plutonium. Eighteen sets of seven actinide and five light metal targets have been selected for seven day exposure in the Experimental Breeder Reactor-II which serves as a prototype of the IFR. Post-irradiation analyses of the exposed targets by gamma, alpha, and mass spectroscopy are used to determine nuclear reaction rates and neutron spectra. These experimental data increase the authors confidence in their ability to predict reaction rates in candidate IFR designs using a variety of neutron transport and diffusion programs.
Date:
November 1, 1994
Creator:
Courtney, J. C.
Object Type:
Report
System:
The UNT Digital Library
Actinide Separation of High-Level Waste Using Solvent Extractants on Magnetic Microparticles
None
Date:
November 1, 1994
Creator:
Nunez, L.; Buchholz, B. A.; Kaminski, M.; Aase, S. B.; Brown, N. R. & Vandegrift, G. F.
Object Type:
Article
System:
The UNT Digital Library
Action memorandum for the Waste Area Grouping 1 Tank WC-14 removal action at Oak Ridge National Laboratory, Oak Ridge, Tennessee
This action memorandum documents approval for a Comprehensive Environmental Response, Compensation, and Liability Act of 1980, as amended (CERCLA), time-critical action. The action will remove radiologically contaminated water from Tank WC-14. The water contains a polychlorinated biphenyl (PCB) at a level below regulatory concern. Tank WC-14 is located in the Waste Area Grouping (WAG) 1 WC-10 Tank Farm at the Oak Ridge National Laboratory (ORNL), Oak Ridge, Tennessee. Contaminated sludge remaining in the tank after removal of the liquid will be the subject of a future action.
Date:
November 1, 1994
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Adsorption of sulfur on bimetallic surfaces: Formation of copper sulfides on Pt(111) and Ru(001)
It has been found that by making specific bimetallic systems (in this case a noble metal deposited on a transition metal surface) one can change the catalytic activity and selectivity of the metals for reactions that lead to the conversion of hydrocarbons. A major problem associated with these catalysts is sulfur poisoning. The interaction of sulfur and copper on Pt(111) and Ru(001) has been examined using X-ray photoelectron spectroscopy (XPS) and thermal desorption mass spectroscopy (TDS). Cu/Pt (111) and Cu/Ru(001) surfaces were exposed to S{sub 2} gas at 300 K. It was found that for both substrates stable copper-sulfide films were formed, of which the Cu-S/Ru(001) system was the more stable. The decomposition of the Cu{sub 2}S films on Pt(111) occurred at 600--850 K and on Ru(001) at 900--1,000 K. Breakdown of the films led to evolution into the gas phase of sulfur (mainly as S{sub 2}) without desorption of copper or the sulfur chemisorbed on the substrate. This chemisorbed sulfur desorbed in a broad feature from 1,000--1,500 K. For the Ru(001) substrate the Cu atoms remained on the surface until they desorbed at 1080 K, while on Pt(111) the Cu atoms migrated into the Pt(111) surface to form a …
Date:
November 1, 1994
Creator:
Kuhn, M. & Rodriguez, J. A.
Object Type:
Report
System:
The UNT Digital Library