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Calorimetric assay of reactor grade PuO{sub 2}

Description: This paper describes an experiment to estimate random and systematic errors in determining the effective specific power of plutonium. Precisons and accuracies comparable to coulometric assay were demonstrated for a wide range of plutonium isotopic compositions. Thus, calorimetric assay can provide an effective method for plutonium assay of materials in the nuclear fuel cycle.
Date: December 31, 1977
Creator: Rodenburg, W. W. & Rogers, D. R.
Partner: UNT Libraries Government Documents Department

Transfer operations with tritium -- A review

Description: Controlled thermonuclear reactors will involve pumping operations with tritium that may involve pressures ranging from submillipascals to megapascals. A variety of pumps is available that can cover portions of this range, and these can be staged to cove the entire pressure range. Some of these pumps can be adapted to virtually any size requirement currently anticipated. Special attention must be paid to operating features and construction materials.
Date: December 31, 1975
Creator: Folkers, C.L. & Gede, V.P.
Partner: UNT Libraries Government Documents Department

High-pressure tritium equipment

Description: Some solutions to problems of compressing and containing tritium gas to 200 MPa at 700 K are discussed The principal emphasis is on commercial compressors and high-pressure equipment that can be modified easily by the researcher for safe use with tritium. Experience with metal belows and diaphragm compressors has been favorable. Selection of materials, fittings and gauges for high- pressure tritium work also is reviewed briefly.
Date: December 31, 1976
Creator: Coffin, D.O.
Partner: UNT Libraries Government Documents Department

Status of evaluation of tuff in southern Nevada for geologic disposal of high level nuclear wastes

Description: Siliceous tuff in southern Nevada occurs in a complex and locally active geological environment. Regional thrust faulting, Basin and Range faulting, and present-day seismicity complicate exploration and site characterization activities. The inherent variability of tuff and the complexity of caldera complexes also complicate siting efforts, but may serve to enhance long-term containment. Time--space trends of silicic volcanism are moderately well-established, while those of recent basaltic volcanism are not. At present, the final consequences for repository siting of the geologic complexities described in this paper are not known. Evidence from laboratory cation exchange measurements indicate that tuff and tuffaceous alluvium can serve as effective natural barriers to migration of radionuclides. This fact, coupled with multiple hydrologic barriers and long flow paths, as in the vicinity of the Nevada Test Site, might well result in tuff being a suitable medium for the safe long-term geologic disposal of nuclear wastes. Preliminary thermal modeling indicates the strong influence of varying assumptions regarding in situ fluid pressures and geothermal heat flux on acceptable initial areal power loadings.
Date: December 31, 1979
Creator: Lappin, A. R. & Crowe, B. M.
Partner: UNT Libraries Government Documents Department

Sorption and migration of radionuclides in geologic media

Description: The interactions of a quartz monzonite, an argillite, an alluvium, and several tuffs with various radionuclides in selected phreatic waters have been studied. The sorption--desorption hehavior of Sr, Tc(VII), Cs, Ba, Ce, Eu, U(VI), Pu, and Am under ambient and 70{sup 0}C temperature conditions has been measured.
Date: December 31, 1978
Creator: Erdal, B.R.; Daniels, W.R.; Hoffman, D.C.; Lawrence, F.O. & Wolfsberg, K.
Partner: UNT Libraries Government Documents Department

Parameters affecting radionuclide migration in geologic media

Description: Adsorption of several nuclides (Sr, Tc, Cs, Ba, Ce, Eu) on tuff, monzonite, and argillite was studied experimentally. 3 tables. (DLC)
Date: December 31, 1979
Creator: Erdal, B.R.; Bayhurst, B.P. & Daniels, W.R.
Partner: UNT Libraries Government Documents Department

Proceedings of the Task 4 Waste Isolation Safety Assessment Program second contractor information meeting

Description: Volume 1 contains the following papers: Solution Species of {sup 239}Pu in Oxidizing Environments; Solution Species of {sup 239}Pu in the Environment; Theoretical and Experimental Evaluation of Waste Transport in Selected Rocks; Studies of Radionuclide Availability and Migration at the Nevada Test Site Relevant to Radioactive Waste Disposal; Systematic Study of Metal Ion Sorption on Selected Geologic Media; Chromatographic K/sub d/ values of Radionuclides; Effects of Redox Potentials on Sorption of Radionuclides by Geologic Media; and Transport Properties of Nuclear Waste in Geologic Media. Individual papers were processed.
Date: January 1978
Partner: UNT Libraries Government Documents Department

REPASSIVATION STUDIES OF ALUMINUM USING A ROTATING STRIP ELECTRODE

Description: In this work a technique was described to study the repassivation of bare metal surfaces. The advantage of this approach over other techniques is the ease with which multiple repassivation events can be studied. The repassivation rate of aluminum was found to depend on the anion in solution. Repassivation rates are higher for aluminum in phosphate and sulfate solutions compared to borate. It is possible that borate may interact more strongly than sulfate or phosphate on the bare aluminum surface blocking the diffusion of oxygen or changing the rate of repassivation.
Date: September 1, 1977
Creator: ALDYKIEWICZ,A.J.,JR. & ISAACS,H.S.
Partner: UNT Libraries Government Documents Department

Sensitivity study on the parameters of the regional hydrology model for the Nevada nuclear waste storage investigations

Description: Statistical methodology has been applied to the investigation of the regional hydrologic systems of a large area encompassing the Nevada Test Site (NTS) as a part of the overall evaluation of the NTS for deep geologic disposal of nuclear waste. Statistical techniques including Latin hypercube sampling were used to perform a sensitivity analysis on a two-dimensional finite-element code of 16 geohydrologic zones used to model the regional ground-water flow system. The Latin hypercube sample has been modified to include correlations between corresponding variables from zone to zone. From the results of sensitivity analysis it was found that: (1) the ranking of the relative importance of input variables between locations within the same geohydrologic zone were similar, but not identical; and (2) inclusion of a correlation structure for input variables had a significant effect on the ranking of their relative importance. The significance of these results is discussed with respect to the hydrology of the region.
Date: December 31, 1979
Creator: Iman, R. L.; Davenport, J. M.; Waddell, R. K.; Stephens, H. P. & Leap, D. I.
Partner: UNT Libraries Government Documents Department

Conversion of associated natural gas to liquid hydrocarbons

Description: Energy International is a leader in catalyst and process development as it relates to Fischer-Tropsch (F-T) technology. Through this activity, a concept evolved for a new technique for capturing the fuel value in the associated natural gas contained in crude oil. In the new concept, the dissolved natural gas would be processed via F-T technology to produce light hydrocarbons that would then, in one manifestation of this concept, be redissolved in the crude oil to produce a lighter crude than the original, containing all of the natural gas, but with the vapor pressure of the crude lowered to an acceptable level via the conversion process. This technique would be of particular interest in those instances where the alternative methods of collections and utilizing the associated natural gas were expensive. A study of the application of this technology was undertaken by EI with support from the DOE.
Date: December 31, 1979
Creator: Singleton, A.H., Cooper, P.G.
Partner: UNT Libraries Government Documents Department

Second workshop geothermal reservoir engineering: Proceedings

Description: The Arab oil embargo of 1973 focused national attention on energy problems. A national focus on development of energy sources alternative to consumption of hydrocarbons led to the initiation of research studies of reservoir engineering of geothermal systems, funded by the National Science Foundation. At that time it appeared that only two significant reservoir engineering studies of geothermal reservoirs had been completed. Many meetings concerning development of geothermal resources were held from 1973 through the date of the first Stanford Geothermal Reservoir Engineering workshop December 15-17, 1975. These meetings were similar in that many reports dealt with the objectives of planned research projects rather than with results. The first reservoir engineering workshop held under the Stanford Geothermal Program was singular in that for the first time most participants were reporting on progress inactive research programs rather than on work planned. This was true for both laboratory experimental studies and for field experiments in producing geothermal systems. The Proceedings of the December 1975 workshop (SGP-TR-12) is a remarkable document in that results of both field operations and laboratory studies were freely presented and exchanged by all participants. With this in mind the second reservoir engineering workshop was planned for December 1976. The objectives were again two-fold. First, the workshop was designed as a forum to bring together researchers active in various physical and mathematical branches of the developing field of geothermal reservoir engineering, to give participants a current and updated view of progress being made in the field. The second purpose was to prepare this Proceedings of Summaries documenting the state of the art as of December 1976. The proceedings will be distributed to all interested members of the geothermal community involved in the development and utilization of the geothermal resources in the world. Many notable occurrences took place between the ...
Date: December 3, 1976
Creator: Kruger, P. & Ramey, H.J. Jr. (eds.)
Partner: UNT Libraries Government Documents Department

The Effects of a Step Change in Water Flow on an Initially Linear Profile of Temperature

Description: In recent analyses of the hot-water system at Wairakei, New Zealand (Mercer, Pinder, and Donaldson, 1975) and the vapor-dominated system at Larderello, Italy (Petracco and Squarci, 1975), it has been suggested that large quantities of cold water are entering the reservoir by flowing down from the surface and then horizontally into the reservoir because of decreased reservoir pressures. It is also suggested that decreased reservoir pressures should increase these downward flows above their pre-exploitation levels. In order to estimate the effects of vertical flows on the temperature distribution, two idealized problems are analyzed in this paper. In both problems, the initial condition is a linear temperature increase with depth, and the flow starts at time equal to zero. In the first problem, the flow is through a semi-confining layer with the temperature fixed at the top and bottom of the layer. In the second problem, the flow is into a half-space with the surface temperature fixed. The magnitudes of the effects for the two cases considered suggest that monitoring temperatures in undisturbed wells on the margins of producing geothermal areas should give a measure of the change in the fairly local recharge. If the amount of total recharge is known, subtracting the localized recharge should give an estimate of the recharge derived from deep circulation that originates at large distances from the reservoir. 7 refs., 2 figs.
Date: December 1, 1976
Creator: Nathenson, Manuel
Partner: UNT Libraries Government Documents Department

Laboratory Experiments on Hydrofracture and the Permeability of Hot Granite

Description: It has been proposed that an artificial geothermal reservoir could be created by injecting water under high pressure through a hole drilled into a hot dry batholith. By drilling a second hole to intersect the plane created by hydraulic fracture, a fluid circulation system could be created by pumping cold water into one hole and extracting hot water or steam through the other hole. The authors have carried out a number of laboratory experiments to investigate various aspects of this project. While it is usually assumed that a single tension hydraulic fracture is formed with its plane parallel to the direction of maximum principal stress, the authors have found in laboratory experiments that, if the rock is under shear stress and the fluid is injected slowly enough, shear fractures are formed with their planes oriented about 30 degrees to the direction of maximum principal stress. The results suggest that it may be possible, in regions of high tectonic stress, to increase the fracture surface area simply by varying the fluid injection rate to create not only a tension fracture but shear fractures as well. The authors found that the spacial distribution of the fracture planes is accurately determinable from the location of the acoustic emission events that occur during fracture. The authors state that this distribution should also be calculable from the change in magnetic field at the earth's surface caused by the injection of high-magnetic-susceptibility material into the fracture. Results are described of measurements of the permeability of granite under confining pressure and differential stress at temperatures to 400ÂșC, along with how they relate to the way a circulating system's permeability changes with time. 4 refs.
Date: December 1, 1976
Creator: Byerlee, J.; Lockner, D. & Summers, R.
Partner: UNT Libraries Government Documents Department

Particle resuspension rates

Description: No Description Available.
Date: August 1, 1974
Creator: Sehmel, G A & Lloyd, F D
Partner: UNT Libraries Government Documents Department

Mixed species in intense neutral beams

Description: No Description Available.
Date: April 1, 1974
Creator: Berkner, K. H.; Pyle, R. V. & Stearns, J. W.
Partner: UNT Libraries Government Documents Department