Partner
UNT Libraries Government Documents Department
131
Oklahoma Historical Society
74
Deaf Smith County Library
35
UNT Libraries Special Collections
32
Denton Public Library
31
UT San Antonio Libraries Special Collections
28
Sterling Municipal Library
16
UNT Libraries
15
Abilene Public Library
13
Winkler County Library
9
56 More
Collection
Texas Digital Newspaper Program
276
Office of Scientific & Technical Information Technical Reports
108
Oklahoma Digital Newspaper Program
74
Tocker Foundation Grant
60
Denton County Newspapers Collection
39
Denton Record-Chronicle
38
The Brand (Hereford, TX)
35
Margaret Formby Memorial Collection
35
North Texas Daily / The Campus Chat
32
San Antonio Register
28
91 More
Degree Department
Country
Decade
Month
Language
489 Matching Results
Results open in a new window/tab. Unexpected Results? Search the Catalog Instead.
Results:
1 - 24 of
489
next
Repository site data report for unsaturated tuff, Yucca Mountain, Nevada
The US Department of Energy is currently considering the thick sequences of unsaturated, fractured tuff at Yucca Mountain, on the southwestern boundary of the Nevada Test Site, as a possible candidate host rock for a nuclear-waste repository. Yucca Mountain is in one of the most arid areas in the United States. The site is within the south-central part of the Great Basin section of the Basin and Range physiographic province and is located near a number of silicic calderas of Tertiary age. Although localized zones of seismic activity are common throughout the province, and faults are present at Yucca Mountain, the site itself is basically aseismic. No data are available on the composition of ground water in the unsaturated zone at Yucca Mountain. It has been suggested that the composition is bounded by the compositions of water from wells USW-H3, UE25p-1, J-13, and snow or rain. There are relatively few data available from Yucca Mountain on the moisture content and saturation, hydraulic conductivity, and characteristic curves of the unsaturated zone. The available literature on thermomechanical properties of tuff does not always distinguish between data from the saturated zone and data from the unsaturated zone. Geochemical, hydrologic, and thermomechanical data available …
Date:
November 1, 1985
Creator:
Tien, P. L.; Updegraff, C. D.; Siegel, M. D.; Wahi, K. K. & Guzowski, R. V.
Object Type:
Report
System:
The UNT Digital Library
Geology of the USW SD-12 drill hole Yucca Mountain, Nevada
Drill hole USW SD-12 is one of several holes drilled under Site Characterization Plan Study 8.3.1.4.3.1, also known as the {open_quotes}Systematic Drilling Program,{close_quotes} as part of the U.S. Department of Energy characterization program at Yucca Mountain, Nevada, which has been proposed as the potential location of a repository for high-level nuclear waste. The SD-12 drill hole is located in the central part of the potential repository area, immediately to the west of the Main Test Level drift of the Exploratory Studies Facility and slightly south of midway between the North Ramp and planned South Ramp declines. Drill hole USW SD-12 is 2166.3 ft (660.26 m) deep, and the core recovered essentially complete sections of ash-flow tuffs belonging to the lower half of the Tiva Canyon Tuff, the Pah Canyon Tuff, and the Topopah Spring Tuff, all of which are part of the Miocene Paintbrush Group. A virtually complete section of the Calico Hills Formation was also recovered, as was core from the entire Prow Pass Tuff formation of the Crater Flat Group.
Date:
November 1, 1996
Creator:
Rautman, C.A. & Engstrom, D.A.
Object Type:
Report
System:
The UNT Digital Library
Total system performance assessment - 1995: An evaluation of the potential Yucca Mountain Repository
The U.S. Department of Energy (DOE) is currently investigating the feasibility of permanently disposing the nation`s commercial high-level radioactive wastes (in the form of spent fuel from the over 100 electric power-generating nuclear reactors across the U.S.) and a portion of the defense high-level radioactive wastes (currently stored at federal facilities around the country) in the unsaturated tuffaceous rocks at Yucca Mountain, Nevada. Quantitative predictions based on the most current understanding of the processes and parameters potentially affecting the long-term behavior of the disposal system are used to assess the ability of the site and its associated engineered designs to meet regulatory objectives set forward by the U.S. Nuclear Regulatory Commission (NRC) and the U.S. Environmental Protection Agency (EPA). The evaluation of the ability of the overall system to meet the performance objectives specified in the applicable regulatory standards has been termed total system performance assessment (TSPA). The aim of any total system performance assessment is to be as complete and reasonably conservative as possible and to assure that the descriptions of the predictive models and parameters are sufficient to ascertain their accuracy. Total system performance assessments evolve with time. As additional site and design information is generated, performance assessment …
Date:
November 1, 1995
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Total system performance assessment - 1995: An evaluation of the potential Yucca Mountain repository
The U.S. Department of Energy (DOE) is currently investigating the feasibility of permanently disposing the nation`s commercial high-level radioactive wastes (in the form of spent fuel from the over 100 electric power-generating nuclear reactors across the U.S.) and a portion of the defense high-level radioactive wastes (currently stored at federal facilities around the country) in the unsaturated tuffaceous rocks at Yucca Mountain, Nevada. Quantitative predictions based on the most current understanding of the processes and parameters potentially affecting the long-term behavior of the disposal system are used to assess the ability of the site and its associated engineered designs to meet regulatory objectives of the US NRC and the US EPA. The evaluation of the ability of the overall system to meet the performance objectives specified in the applicable regulatory standards has been termed total system performance assessment (TSPA). Total system performance assessments require the explicit quantification of the relevant processes and process interactions. In addition assessments are useful to help define the most significant processes, the information gaps and uncertainties and therefore the additional information required for more robust and defensible assessment of the overall performance. The aim of any total system performance assessment is to be as complete …
Date:
November 1, 1995
Creator:
Atkins, J. E.; Lee, J. H.; Lingineni, S.; Mishra, S.; McNeish, J. A.; Sassani, D. C. et al.
Object Type:
Report
System:
The UNT Digital Library
A review of the available technologies for sealing a potential underground nuclear waste repository at Yucca Mountain, Nevada
The purpose of this report is to assess the availability of technologies to seal underground openings. The technologies are needed to seal the potential high-level radioactive waste repository at Yucca Mountain. Technologies are evaluated for three basic categories of seal components: backfill (general fill and graded fill), bulkheads, and grout curtains. Not only is placement of seal components assessed, but also preconditioning of the placement area and seal component durability. The approach taken was: First, review selected sealing case histories (literature searches and site visits) from the mining, civil, and defense industries; second, determine whether reasonably available technologies to seal the potential repository exist; and finally, identify deficiencies in existing technologies. It is concluded that reasonably available technologies do exist to place backfill, bulkheads, and grout curtains. Technologies also exist to precondition areas where seal components are to be placed. However, if final performance requirements are stringent for these engineered structures, some existing technologies may need to be developed. Deficiencies currently do exist in technologies that demonstrate the long-term durability and performance of seal components. Case histories do not currently exist that demonstrate the placement of seal components in greatly elevated thermal and high-radiation environments and in areas where ground …
Date:
November 1, 1994
Creator:
Fernandez, J. A. & Richardson, A. M.
Object Type:
Report
System:
The UNT Digital Library
SELECTED GROUND-WATER DATA FRO YUCCA MOUNTAIN REGION, SOUTHERN NEVADA AND EASTERN CALIFORNIA, THROUGH DECEMBER 1998
The U.S. Geological Survey, in support of the U.S. Department of Energy, Yucca Mountain Site Characterization Project, collects, compiles, and summarizes hydrologic data in the Yucca Mountain region. The data are collected to allow assessments of ground-water resources during studies to determine the potential suitability of Yucca Mountain for storing high-level nuclear waste. Data on ground-water levels at 34 wells and a fissure (Devils Hole), ground-water discharge at 5 springs and a flowing well, and total reported ground-water withdrawals within Crater Flat, Jackass Flats, Mercury Valley, and the Amargosa Desert are presented for calendar year 1998. Data collected prior to 1998 are graphically presented and data collected by other agencies (or as part of other Geological Survey programs) are included to further indicate variations of ground-water levels, discharges, and withdrawals through time. A statistical summary of ground-water levels at seven wells in Jackass Flats is presented to indicate potential effects of ground-water withdrawals associated with U.S. Department of Energy activities near Yucca Mountain. The statistical summary includes the number of measurements, the maximum, minimum, and median water-level altitudes, and the average deviation of measured water-level altitudes for selected baseline periods and for calendar years 1992-98. At two water-supply wells and …
Date:
November 29, 2000
Creator:
Groat, Charles G.
Object Type:
Report
System:
The UNT Digital Library
Preliminary Geologic Map of the Yucca Flat Quadrangle, Nye County, Nevada
An index and geological map of Nevada showing the Yucca Flat quadrangle.
Date:
November 1962
Creator:
McKay, E. J.
Object Type:
Report
System:
The UNT Digital Library
Development of Earthquake Ground Motion Input for Preclosure Seismic Design and Postclosure Performance Assessment of a Geologic Repository at Yucca Mountain, NV
This report describes a site-response model and its implementation for developing earthquake ground motion input for preclosure seismic design and postclosure assessment of the proposed geologic repository at Yucca Mountain, Nevada. The model implements a random-vibration theory (RVT), one-dimensional (1D) equivalent-linear approach to calculate site response effects on ground motions. The model provides results in terms of spectral acceleration including peak ground acceleration, peak ground velocity, and dynamically-induced strains as a function of depth. In addition to documenting and validating this model for use in the Yucca Mountain Project, this report also describes the development of model inputs, implementation of the model, its results, and the development of earthquake time history inputs based on the model results. The purpose of the site-response ground motion model is to incorporate the effects on earthquake ground motions of (1) the approximately 300 m of rock above the emplacement levels beneath Yucca Mountain and (2) soil and rock beneath the site of the Surface Facilities Area. A previously performed probabilistic seismic hazard analysis (PSHA) (CRWMS M&O 1998a [DIRS 103731]) estimated ground motions at a reference rock outcrop for the Yucca Mountain site (Point A), but those results do not include these site response effects. …
Date:
November 5, 2004
Creator:
Wong, I.
Object Type:
Report
System:
The UNT Digital Library
Characterization of reactive tracers for C-wells field experiments 1: Electrostatic sorption mechanism, lithium
Lithium (Li{sup +}) was introduced as lithium bromide (LiBr), as a retarded tracer for experiments in the C-wells complex at Yucca Mountain, Nevada Test Site, Nevada. The objective was to evaluate the potential of lithium to sorb predominately by physical forces. lithium was selected as a candidate tracer on the basis of high solubility, good chemical and biological stability, and relatively low sorptivity; lack of bioaccumulation and exclusion as a priority pollutant in pertinent federal environmental regulations; good analytical detectability and low natural background concentrations; and a low cost Laboratory experiments were performed with suspensions of Prow Pass cuttings from drill hole UE-25p{number_sign}1 at depths between 549 and 594 m in J-13 water at a pH of approximately 8 and in the temperature range of 25{degree}C to 45{degree}C. Batch equilibrium and kinetics experiments were performed; estimated thermodynamic constants, relative behavior between adsorption and desorption, and potentiometric studies provided information to infer the physical nature of lithium sorption.
Date:
November 1, 1989
Creator:
Fuentes, H. R.; Polzer, W. L.; Essington, E. H. & Newman, B. D.
Object Type:
Report
System:
The UNT Digital Library
Leaching patterns and secondary phase formation during unsaturated leaching of UO{sub 2} at 90{degrees}C
Experiments are being conducted that examine the reaction of UO{sub 2} with dripping oxygenated ground water at 90{degrees}C. The experiments are designed to identify secondary phases formed during UO{sub 2} alteration, evaluate parameters controlling U release, and act as scoping tests for studies with spent fuel. This study is the first of its kind that examines the alteration of UO{sub 2} under unsaturated conditions expected to exist at the proposed Yucca Mountain repository site. Results suggest the UO{sub 2} matrix will readily react within a few months after being exposed to simulated Yucca Mountain conditions. A pulse of rapid U release, combined with the formation of dehydrated schoepite on the UO{sub 2} surface, characterizes the reaction between one to two years. Rapid dissolution of intergrain boundaries and spallation of UO{sub 2} granules appears to be responsible for much of the U released. Differential release of the UO{sub 2} granules may be responsible for much of the variation observed between duplicate experiments. Less than 5 wt % of the released U remains in solution or in a suspended form, while the remaining settles out of solution as fine particles or is reprecipitated as secondary phases. Subsequent to the pulse period, U …
Date:
November 1, 1991
Creator:
Wronkiewicz, D. J.; Bates, J. K.; Gerding, T. J.; Veleckis, E. & Tani, B. S.
Object Type:
Report
System:
The UNT Digital Library
Pneumatic testing in 45-degree-inclined boreholes in ash-flow tuff near Superior, Arizona
Matrix permeability values determined by single-hole pneumatic testing in nonfractured ash-flow tuff ranged from 5.1 to 20.3*10{sup -16} m{sup 2} (meters squared), depending on the gas-injection rate and analysis method used. Results from the single-hole tests showed several significant correlations between permeability and injection rate and between permeability and test order. Fracture permeability values determined by cross-hole pneumatic testing in fractured ash-flow tuff ranged from 0.81 to 3.49 x 10{sup -14} m{sup 2}, depending on injection rate and analysis method used. Results from the cross-hole tests monitor intervals showed no significant correlation between permeability and injection rate; however, results from the injection interval showed a significant correlation between injection rate and permeability. Porosity estimates from the cross-hole testing range from 0.8 to 2.0 percent. The maximum temperature change associated with the pneumatic testing was 1.2{degrees}C measured in the injection interval during cross-hole testing. The maximum temperature change in the guard and monitor intervals was 0.1{degrees}C. The maximum error introduced into the permeability values due to temperature fluctuations is approximately 4 percent. Data from temperature monitoring in the borehole indicated a positive correlation between the temperature decrease in the injection interval during recovery testing and the gas-injection rate. The thermocouple psychrometers …
Date:
November 1995
Creator:
LeCain, G. D.
Object Type:
Report
System:
The UNT Digital Library
Feasibility study of the seismic reflection method in Amargosa Desert, Nye County, Nevada
The US Geological Survey (USGS) working under an Interagency agreement with the Department of Energy is engaged in a broad geoscience program to assess and identify a potential repository for high level nuclear waste at Yucca Mountain, Nye County, Nevada. The USGS program, referred to as the Yucca Mountain Project, or YMP, consists of integrated geologic, hydrologic and geophysical studies which range in nature from site specific to regional. This report is an evaluation of different acquisition methods for future regional seismic reflection studies to be conducted in the vicinity of Yucca Mountain, located in the southwestern corner of the Nevada Test Site (NTS). In January 1988, field studies were conducted to investigate the feasibility of using the common-depth point (CDP) seismic reflection method to map subsurface geological horizons within the Amargosa Desert, Nye County, Nevada. The goal of the field study was to investigate which seismic reflection method(s) should be used for mapping shallow to lower-crustal horizons. Therefore, a wide-variety of field acquisition parameters were tested, included point versus linear receiver group arrays; Vibroseis (service and trademark of Conoco, Inc.) versus explosive sources; Vibroseis array patterns; and Vibroseis sweep and frequency range. 31 refs., 33 figs., 8 tabs.
Date:
November 1, 1990
Creator:
Brocher, T. M.; Hart, P. E. & Carle, S. F.
Object Type:
Report
System:
The UNT Digital Library
Corrective Action Decision Document/Closure Report for Corrective Action Unit 570: Area 9 Yucca Flat Atmospheric Test Sites, Nevada National Security Site, Nevada, Revision 0
This Corrective Action Decision Document/Closure Report presents information supporting the closure of Corrective Action Unit (CAU) 570: Area 9 Yucca Flat Atmospheric Test Sites, Nevada National Security Site, Nevada. This complies with the requirements of the Federal Facility Agreement and Consent Order (FFACO) that was agreed to by the State of Nevada; U.S. Department of Energy (DOE), Environmental Management; U.S. Department of Defense; and DOE, Legacy Management. The purpose of the CADD/CR is to provide justification and documentation supporting the recommendation that no further corrective action is needed.
Date:
November 1, 2013
Creator:
Matthews, Patrick
Object Type:
Report
System:
The UNT Digital Library
Preliminary capillary hysteresis simulations for fractured rocks -- model development and results of simulations
As part of the code development and modeling work being carried out to characterize the flow in the unsaturated zone at Yucca Mountain, Nevada, capillary hysteresis models simulating the history-dependence of the characteristic curves have been developed. The objective of the work has been both to develop the hysteresis models, as well as to obtain some preliminary estimates of the possible hysteresis effects in the fractured rocks at Yucca Mountain given the limitations of presently available data. Altogether three different models were developed based on work of other investigators reported in the literature. In these three models different principles are used for determining the scanning paths: in model (1) the scanning paths are interpolated from tabulated first-order scanning curves, in model (2) simple interpolation functions are used for scaling the scanning paths from the expressions of the main wetting and main drying curves and in model (3) the scanning paths are determined from expressions derived based on the dependent domain theory of hysteresis.
Date:
November 1, 1991
Creator:
Niemi, A. & Bodvarsson, G. S.
Object Type:
Report
System:
The UNT Digital Library
RADIONUCLIDE TRANSPORT MODELS UNDER AMBIENT CONDITIONS
The purpose of this model report is to document the unsaturated zone (UZ) radionuclide transport model, which evaluates, by means of three-dimensional numerical models, the transport of radioactive solutes and colloids in the UZ, under ambient conditions, from the repository horizon to the water table at Yucca Mountain, Nevada.
Date:
November 1, 2004
Creator:
Magnuson, S.
Object Type:
Report
System:
The UNT Digital Library
Nonequilibrium thermodynamical model for spent fuel dissolution rate
A non-equilibrium thermodynamic model is developed for the dissolution response of uranium oxide spent fuels waste forms. The objective is to derive function forms for the dissolution rate that are consistent with quasi-static, irreversible thermodynamic processes. These function forms contain thermodynamic chemical potentials of both the solid (spent fuels) and the solution (water chemistries) along with a set of coefficients and parameters that can be evaluated by numerical regression of dissolution test data. Currently, detailed knowledge is not available for the atomic (mechanistic) steps and the sequence of chemical/electro-chemical reaction steps to describe the dissolution process over the range of spent fuel inventory, potential water chemistries, and temperatures. The existing approach is obtaining an experimental data base of dissolution rates for a subset of spent fuels over a range of controlled, aggressive water chemistries and temperatures. With a numerical regression algorithm, these data are used to evaluate empirical parameters in a rate law. The function form of this rate law is a product polynomial of the bulk water chemistry concentrations and temperature. In its present form, this function form does not have an explicit thermodynamic dependence on the uranium oxide waste form. In addition, the use of bulk concentrations in …
Date:
November 1, 1995
Creator:
Stout, R. B.
Object Type:
Article
System:
The UNT Digital Library
The Campus Chat (Denton, Tex.), Vol. 46, No. 15, Ed. 1 Friday, November 9, 1962
Semiweekly student newspaper from the North Texas State College in Denton, Texas that includes local, state, and campus news along with advertising.
Date:
November 9, 1962
Creator:
Veteto, Bob.
Object Type:
Newspaper
System:
The Portal to Texas History
The Campus Chat (Denton, Tex.), Vol. 46, No. 17, Ed. 1 Friday, November 16, 1962
Semiweekly student newspaper from the North Texas State College in Denton, Texas that includes local, state, and campus news along with advertising.
Date:
November 16, 1962
Creator:
Veteto, Bob.
Object Type:
Newspaper
System:
The Portal to Texas History
The Campus Chat (Denton, Tex.), Vol. 46, No. 16, Ed. 1 Wednesday, November 14, 1962
Semiweekly student newspaper from the North Texas State College in Denton, Texas that includes local, state, and campus news along with advertising.
Date:
November 14, 1962
Creator:
Veteto, Bob.
Object Type:
Newspaper
System:
The Portal to Texas History
The Campus Chat (Denton, Tex.), Vol. 46, No. 14, Ed. 1 Wednesday, November 7, 1962
Semiweekly student newspaper from the North Texas State College in Denton, Texas that includes local, state, and campus news along with advertising.
Date:
November 7, 1962
Creator:
Veteto, Bob.
Object Type:
Newspaper
System:
The Portal to Texas History
The Campus Chat (Denton, Tex.), Vol. 46, No. 18, Ed. 1 Wednesday, November 28, 1962
Semiweekly student newspaper from the North Texas State College in Denton, Texas that includes local, state, and campus news along with advertising.
Date:
November 28, 1962
Creator:
Veteto, Bob.
Object Type:
Newspaper
System:
The Portal to Texas History
The Campus Chat (Denton, Tex.), Vol. 46, No. 13, Ed. 1 Friday, November 2, 1962
Semiweekly student newspaper from the North Texas State College in Denton, Texas that includes local, state, and campus news along with advertising.
Date:
November 2, 1962
Creator:
Veteto, Bob.
Object Type:
Newspaper
System:
The Portal to Texas History
The Sanger Courier (Sanger, Tex.), Vol. 64, No. 5, Ed. 1 Thursday, November 22, 1962
Weekly newspaper from Sanger, Texas that includes local, state, and national news along with extensive advertising.
Date:
November 22, 1962
Creator:
Cornell, Kenneth W.
Object Type:
Newspaper
System:
The Portal to Texas History
The Campus Chat (Denton, Tex.), Vol. 46, No. 19, Ed. 1 Friday, November 30, 1962
Semiweekly student newspaper from the North Texas State College in Denton, Texas that includes local, state, and campus news along with advertising.
Date:
November 30, 1962
Creator:
Veteto, Bob.
Object Type:
Newspaper
System:
The Portal to Texas History