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99
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10,164 Matching Results
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Seismic response analysis for structures with non-orthogonal modes
For seismic analysis of structures in nuclear industry, the spectrum method of modal combination acceptable to US Nuclear Regulatory Commission is applicable only to systems with orthogonal natural modes. When a structure with frequency dependent boundary conditions is set in motion, its natural modes of vibration are generally non-orthogonal. Based on such a structure, the spectrum method of modal composition is generalized to include systems with non-orthogonal modes. The generalized expression for the participation factor of each model is reducible to that prescribed by NRC, when the natural modes of the system are orthogonal. To illustrate the generalized method, the model responses of a simple structure are analyzed in detail.
Date:
January 1, 1980
Creator:
Yau, W. F.
Object Type:
Article
System:
The UNT Digital Library
Deposition and removal of radioactive isotopes from LMFBR components
The development of an analytical model to describe the production, transport and eventual removal of radioactive materials in the primary sodium of LMFBR's is a continuing Sodium Technology activity sponsored by the Department of Energy. This paper describes studies directed toward obtaining an understanding of the deposition from sodium of fuel cladding activated corrosion products onto stainless steel alloys and the effect of their diffusion into the base metal on the process required to decontaminate it. The objective of the decontamination operation is to reduce the activity to a level allowing hands on maintenance without causing unacceptable damage to the component.
Date:
January 1, 1980
Creator:
Hill, E. F.; Lutton, J. M. & Maffei, H. P.
Object Type:
Article
System:
The UNT Digital Library
Organic iodine removal from simulated dissolver off-gas streams using silver-exchanged mordenite
The removal of methyl iodide by absorption onto silver mordenite was studied using a simulated off-gas from the fuel dissolution step of a nuclear fuel reprocessing plant. The methyl iodide absorption of silver mordenite was examined for the effects of NO/sub x/, humidity, iodine concentration, filter temperature, and filter pretreatment. The highest iodine loading achieved in these tests has been 34 mg CH/sub 3/I per g of substrate, approximately five times less than the elemental iodine loadings. Results indicate that a filter operating at a temperature of 150/sup 0/C obtained higher iodine loadings than a similar filter operating at 100/sup 0/C. Pretreatment of the sorbent bed with hydrogen, rather than dry air, at a temperature of 200/sup 0/C also improved the loading. Variations in the methyl iodide concentration had minimal effects on the overall loading. Filters exposed to moist air streams attained higher loadings than those in contact with dry air. A study of the regeneration characteristics of silver mordenite indicates limited adsorbent capacity after complete removal of the iodine with 4% hydrogen in the regeneration gas stream at 500/sup 0/C. 9 figures.
Date:
January 1, 1980
Creator:
Jubin, R. T.
Object Type:
Article
System:
The UNT Digital Library
Analytical model for a vertical buoyant jet
An analytical model for a round and two-dimensional turbulent buoyant jet which is discharged vertically into a stagnant ambient is developed. The buoyant jet is considered to have three separate zone models which are matched to form a complete solution. The velocity field is determined for the entire jet and plume regions by the use of an eddy viscosity which varies along the axis of the jet. The centerline decay of buoyancy is determined throughout and the results are compared to existing numerical codes. The model is applied to the disposal of carbon dioxide enriched seawater. The results can be used to provide design information for minimizing or maximizing the dilution of a discharge by the receiving environment.
Date:
October 1, 1980
Creator:
Lee, D. W.
Object Type:
Report
System:
The UNT Digital Library
Interpretation of a dipole-dipole electrical resistivity survey, Colado geothermal area, Pershing County, Nevada
An electrical resistivity survey in the Colado geothermal area, Pershing County, Nevada has defined areas of low resistivity on each of five lines surveyed. Some of these areas appear to be fault controlled. Thermal fluids encountered in several drill holes support the assumption that the hot fluids may be associated with areas of low resistivity. The evidence of faulting as interpreted from modeling of the observed resistivity data is therefore particularly significant since these structures may be the conduits for the thermal fluids. Sub-allurial fault zones are interpreted to occur between stations 0 to 5 NW on Line D and on Line A between stations 4 NW and 4 SE. Fault zones are also interpreted on Line C near stations 1 NW, 1 SE, and 3 SE, and on Line E between stations 2 to 4 NW and near 1 SE. No faulting is evident under the alluvial cover on the southwest end of Line B. A deep conductive zone is noted within the mountain range on two resistivity lines. There is no definite indication that thermal fluids are associated with this resistivity feature.
Date:
September 1, 1980
Creator:
Mackelprang, C.E.
Object Type:
Report
System:
The UNT Digital Library
HTGR-GT closed-cycle gas turbine: a plant concept with inherent cogeneration (power plus heat production) capability
The high-grade sensible heat rejection characteristic of the high-temperature gas-cooled reactor-gas turbine (HTGR-GT) plant is ideally suited to cogeneration. Cogeneration in this nuclear closed-cycle plant could include (1) bottoming Rankine cycle, (2) hot water or process steam production, (3) desalination, and (4) urban and industrial district heating. This paper discusses the HTGR-GT plant thermodynamic cycles, design features, and potential applications for the cogeneration operation modes. This paper concludes that the HTGR-GT plant, which can potentially approach a 50% overall efficiency in a combined cycle mode, can significantly aid national energy goals, particularly resource conservation.
Date:
April 1, 1980
Creator:
McDonald, C. F.
Object Type:
Article
System:
The UNT Digital Library
Gravity survey of the Escalante Desert and vicinity, in Iron and Washington Counties, Utah
During the summers of 1978 and 1979, a total of 436 new gravity stations were taken in the southern part of the Escalante Desert and vicinity in Iron and Washington counties, Utah. The new stations were combined with 917 other stations taken in previous surveys, and a total of 1353 stations were used in this study, covering an area of about 2700 mi/sup 2/ (7000 km/sup 2/). The purpose of the study was to help evaluate the potential of geothermal resources within the survey area, which includes the Newcastle and Lund KGRA's. All the gravity data were terrain corrected out to a radial distance of 166.7 km from each station, using a computer terrain-correction program. The data were compiled and presented as a complete Bouguer gravity anomaly map with a 2-mgal contour interval. A geologic interpretation of the gravity data was made qualitatively from the gravity map and also quantitatively from four easterly trending gravity profiles taken across the area.
Date:
August 1, 1980
Creator:
Pe, W. & Cook, K.L.
Object Type:
Report
System:
The UNT Digital Library
Department of Energy Nuclear Energy Standards Program
The policy with respect to the development and use of standards in the Department of Energy (DOE) programs concerned with maintaining and developing the nuclear option for the civilian sector (both in the form of the currently used light water reactors and for advanced concepts including the Liquid Metal Fast Breeder Reactor), is embodied in a Nuclear Standards Policy, issued in 1978, whose perspectives and philosophy are discussed.
Date:
January 1, 1980
Creator:
Silver, E.G.
Object Type:
Article
System:
The UNT Digital Library
Stream sediment detailed geochemical survey for Marysvale, Utah
Results of the Marysvale detailed geochemical survey are reported. Field and laboratory data are presented for 397 stream sediment samples and 160 radiometric readings. Statistical and areal distributions of uranium and possible uranium-related variables are displayed. A generalized geologic map of the area is provided, and pertinent geologic factors which may be of significance in evaluating the potential for uranium mineralization are briefly discussed. Stream sediments containing significant amounts of soluble uranium (greater than or equal to 16.93 ppM) occur in numerous areas, the most prevalent being in the western portion of the survey area, within and surrounding the Mount Belknap Caldera. Thorium, beryllium, cerium, manganese, molybdenum, niobium, potassium, yttrium, zinc, and zirconium occur in concentrations greater than or equal to 84th percentile in many sediment samples taken from within and surrounding the Mount Belknap Caldera. The uranium and related variables are associated with highly silicic intrusions and extrusions of the Mount Belknap Volcanics, as well as hydrothermal activity which has occurred in the Marysvale volcanic field.
Date:
July 31, 1980
Creator:
Butz, T. R.; Vreeland, J. L.; Bard, C. S.; Helgerson, R. N.; Grimes, J. G. & Pritz, P. M.
Object Type:
Report
System:
The UNT Digital Library
Separate effects test stand for obtaining hydrotransport data
Based on earlier hydrotransport research by English and Russian researchers, a special test stand has been designed and constructed to obtain data to determine hydraulic drag, pipe wear, and comminution of particles. These data are intended for design and separate-effects operating information. This information will be used to supplement data developed by the Hydrotransport Research Facility located at the Pittsburgh Mining Operations, Pittsburgh, Pennsylvania. This report describes the equipment as designed, explains how the hydraulic drag is calculated using test-stand data, and presents some preliminary tests results using water. Tests using water are continuing to further substantiate the system and later, tests will be started using slurries.
Date:
August 1, 1980
Creator:
Allen, C. H.
Object Type:
Report
System:
The UNT Digital Library
Research, development and demonstration of nickel-iron batteries for electric vehicle propulsion. Annual report for 1979
Research progress in the development of Ni/Fe batteries (electrodes in particular) for the period is described. The negative plate demonstrated a reliable lifetime of almost 1000 cycles; 20 mm positive plates were proved feasible; prototype cells yielded output at about 50 Wh/kg and 100 Wh/liter; program goals of 20% greater than these figures appear feasible. 27 figures, 20 tables. (RWR)
Date:
June 1, 1980
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Hydrology and geochemistry of thermal ground water in southwestern Idaho and north-central Nevada
The study area occupies about 14,500 square miles in southwestern Idaho and north-central Nevada. Thermal ground water occurs under artesian conditions, in discontinuous or compartmented zones, in igneous or sedimentary rocks of Tertiary age. Ground-water movement is generally northward. Temperatures of the ground water range from about 30/sup 0/ to more than 80/sup 0/C. Chemical analyses of water from 12 wells and 9 springs indicate that nonthermal waters are a calcium bicarbonate type; thermal waters are a sodium bicarbonate type. Chemical geothermometers indicate probable maximum reservoir temperatures are near 100/sup 0/C. Concentration of tritium in the thermal water water is near zero.
Date:
December 1, 1980
Creator:
Young, H. W. & Lewis, R. E.
Object Type:
Report
System:
The UNT Digital Library
Radiochemical analyses of samples from beneath a solid radioactive waste disposal pit at Los Alamos, New Mexico
Solid radioactive wastes are disposed of by burial in pits excavated in rhyolite tuff at the Los Alamos Scientific Laboratory (LASL). Contaminants in the waste include fission products, uranium, and transuranic elements. In 1976, horizontal core holes were drilled beneath a waste disposal pit that was used from 1963 to 1966. Samples of the core were analyzed for gross alpha, gross beta, total uranium, /sup 90/Sr, /sup 137/Cs, /sup 238/Pu, /sup 239/ /sup 240/Pu, and /sup 241/Am. The measured gross alpha, gross beta, and uranium concentrations were above minimum detection limits; concentrations of the remaining radionuclides, all of which are man-made isotopes, were below the minimum detection limits. Statistical comparisons were made of the gross alpha, gross beta, and uranium data to identify any significant variations from natural concentrations in the tuff. The comparisons demonstrated that none of the radioactivity detected in the samples can be attributed to migration from the disposal pit.
Date:
June 1, 1980
Creator:
Purtymun, W. D.; Rogers, M. A. & Wheeler, M. L.
Object Type:
Report
System:
The UNT Digital Library
Protective coatings and sealants for solar applications
An aging study has been completed which evaluated a number of polymeric materials for potential use as (1) protective coatings for back surfaces of mirrors and (2) solar heliostat edge seals. These investigations were conducted in an artificial weathering chamber that accelerated thermal cycling. The primary mirror failure mode was observed to be silver corrosion resulting from moisture exposure. To increase mirror longevity in current heliostat designs, intimate bonding at all the composite interfaces is essential to minimize moisture pathways to the silvered surface. If any voids or delaminations are present, mirror degradation will eventually occur. Delaminations can also occur as the result of mechanical stresses brought about by mismatches in the various materials coefficients of thermal expansion. If good bonding cannot be achieved or mechanical stresses avoided, then improved moisture barriers must be designed to assure mirror longevity. With good adhesion, a KRATON rubber was found to exhibit superior back surface mirror protection (12 months in environmental chamber with no corrosion). An ultraviolet stabilized butyl rubber appeared to be the best edge seal. All heliostats edge sealed with silicones showed silver corrosion which indicated either poor bonding or moisture permeation.
Date:
September 1, 1980
Creator:
Wischmann, K. B. & Gonzales, M. H.
Object Type:
Report
System:
The UNT Digital Library
Energy conservation and energy decentralization: issues and prospects
Views are presented of the seemingly paradoxical nature and irrationality of the energy system and the decisions that determine its evolution. An economic approach to energy decisions, while widely espoused and generally believed to be the underpinning of our system, appears not to be functioning in very-important areas. The result is enormous waste of economic and intangible resources to produce energy that could be effectively replaced by energy conservation at low costs. This inefficiency in the economic system is, in the author's judgment, far greater than is recognized either by the public or by experts. They feel it has led to an over-investment in centralized energy systems and has discouraged the use of decentralized systems that could contribute significantly in the near term to a lessening of our energy problems. There are some signs that the situation is changing, albeit rather slowly. High prices and the widespread recognition of the seriousness of our energy problems have contributed to an increasing involvement of individuals in energy decisions profoundly affecting their future. To achieve an evolution of the energy system in which decentralized technologies (and, in the near term, particularly technologies that improve the efficiency of energy use) play an important role, …
Date:
January 1, 1980
Creator:
Levine, M. D. & Craig, P. P.
Object Type:
Article
System:
The UNT Digital Library
Energy-related doctoral scientists and engineers in the United States, 1977
Information is compiled about the number and characteristics of doctoral-level engineers and scientists in primarily energy-related activities. These data are for the year 1977 and are part of the data base for a program of continuing studies on the employment and utilization of all scientists and engineers involved in energy-related activities. Data on mathematics, physics, chemistry, environmental engineering, engineering, life sciences, psychology, and social sciences doctoral degree specialties are included.
Date:
April 1, 1980
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Proofreading: for want of a nail
This report presents only the text of a tape-slide half-hour unit that outlines beginning approaches to proofreading. The presentation was designed primarily for typist-compositors needing first-time or review training. The presentation stresses value and need for accurate proofing, and highlights some basic techniques, special danger areas, copy mark-up, and distinguishing between Greek and Roman alphabets.
Date:
January 1, 1980
Creator:
Garner, W.L.
Object Type:
Article
System:
The UNT Digital Library
Application of microfabrication technology to thermionic energy conversion. Progress report 4, 1 May 1980 to 31 July 1980
Two applications of microfabrication technology to thermionic converters have been investigated theoretically. The first is a novel method of maintaining micron or submicron spacings over large areas (>1 cm/sup 2/), using metals of different expansion coefficients to eliminate the shear stresses on the insulating pillars separating the electrodes. The second uses low-voltage field-emission sources to create ions in a large (approx. 1 mm) interelectrode gap for space charge neutralization. The theoretical results for both these approaches are highly encouraging.
Date:
September 5, 1980
Creator:
Brodie, I.
Object Type:
Report
System:
The UNT Digital Library
Two-phase flow studies. Final report
Progress on the following is reported: literature survey, design of two-phase flow testing facility, design of nozzle loop, thermophysical properties, design manual, and advanced energy conversion systems. (MHR)
Date:
August 1, 1980
Creator:
Kestin, J. & Maeder, P. F.
Object Type:
Report
System:
The UNT Digital Library
Computer-aided visualization of database structural relationships
Interactive computer graphic displays can be extremely useful in augmenting understandability of data structures. In complexly interrelated domains such as bibliographic thesauri and energy information systems, node and link displays represent one such tool. This paper presents examples of data structure representations found useful in these domains and discusses some of their generalizable components. 2 figures.
Date:
April 1, 1980
Creator:
Cahn, D.F.
Object Type:
Article
System:
The UNT Digital Library
New Mexico handbook for geothermal resource development state and local government regulations
The regulatory aspects of a wide range of potential projects and sequences within the projects are covered, such as: exploration, demonstration, construction, commercialization, and operation. Such topics as environmental studies, water rights, district heating, taxation archaeological clearances, and construction permits are addressed. Other general information is provided which may assist a prospective geothermal developer in understanding which state and local agencies have review responsibilities, their review procedures, and the appropriate time frame necessary to complete their review process. (MHR)
Date:
July 1, 1980
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
High resolution difference schemes for compressible gas dynamics
The advantages and disadvantages of four new high-resolution difference schemes, namely the von Neumann-Richtmyer, Godunovs, MUSCL and Glimms, for mathematically representing physical conditions in compressible gas flows are compared. (LCL)
Date:
July 30, 1980
Creator:
Woodward, P. & Colella, P.
Object Type:
Article
System:
The UNT Digital Library
Parametric study of the stability margins of cable-in-conduit superconductors: experiment
In a previous experiment on the stability of cable-in-conduit superconductors, we sometimes observed multivalued stability margins, which we attributed to strong heating-induced transient flows. We proposed a schematic theory from which we derived a scaling relation for the limiting current below which the stability margin is always singlevalued. Measurements at different magnetic fields are used to test the scaling with critical temperature and resistivity. We also examine the scaling with heated length and heat pulse duration. The results of these experiments are given and compared with theory.
Date:
January 1, 1980
Creator:
Lue, J. W. & Miller, J. R.
Object Type:
Article
System:
The UNT Digital Library
Toroidal plasma equilibrium with gravity
Toroidal magnetic field configuration in a gravitational field is calculated both from a simple force-balance and from the calculation using magnetic surfaces. The configuration is found which is positionally stable in a star. The vibrational frequency near the equilibrium point is proportional to the hydrostatic frequency of a star multiplied by the ratio (W/sub B//W/sub M/)/sup 1/2/ where W/sub B/ is the magnetic field energy density, and W/sub M/ is the material pressure at the equilibrium point. It is proposed that this frequency may account for the observed solar spot cycles.
Date:
September 1, 1980
Creator:
Yoshikawa, S.
Object Type:
Report
System:
The UNT Digital Library