227 Matching Results

Search Results

Advanced search parameters have been applied.
in subjects: "Yucca Mountain Project"  
Results: 1 - 24 next
open access

Detailed characterization and preliminary adsorption model for materials for an intermediate-scale reactive-transport experiment

Description: An experiment involving migration of fluid and tracers (Li, Br, Ni) through a 6-m-high x 3-m-dia caisson Wedron 510 sand, is being carried out for Yucca Mountain Site Characterization Project. Sand`s surface chemistry of the sand was studied and a preliminary surface-complexation model of Ni adsorption formulated for transport calculations. XPS and leaching suggest that surface of the quartz sand is partially covered by thin layers of Fe-oxyhydroxide and Ca-Mg carbonate and by flakes of kaolini… more
Date: December 31, 1994
Creator: Ward, D. B.; Bryan, C. R. & Siegel, M. D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Shallow infiltration processes in arid watersheds at Yucca Mountain, Nevada

Description: A conceptual model of shallow infiltration processes at Yucca Mountain, Nevada, was developed for use in hydrologic flow models to characterize net infiltration (the penetration of the wetting front below the zone influenced by evapotranspiration). The model categorizes the surface of the site into four infiltration zones. These zones were identified as ridgetops, sideslopes, terraces, and active channels on the basis of water-content changes with depth and time. The maximum depth of measured w… more
Date: December 31, 1994
Creator: Flint, L.E. & Flint, A. L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Crack growth behavior of candidate waste container materials in simulated underground water

Description: Fracture-mechanics crack growth tests were conducted on 25.4-mm-thick compact tension specimens of Types 304L and 316L Stainless steel and Incoloy 825 at 93{degrees}C and 1 atmosphere of pressure in simulated J-13 well water, which is representative of the groundwater at the Yucca Mountain site in Nevada that is proposed for a high-level nuclear waste repository. Crack growth rates were measured under various load conditions: load ratios of 0.2--1.0, frequencies of 2 {times} 10{sup {minus}4}{mi… more
Date: December 31, 1992
Creator: Park, J. Y.; Shack, W. J. & Diercks, D. R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Seismicity and focal mechanisms for the Southern Great Basin of Nevada and California in 1990

Description: For the calendar year 1990, the Southern Great Basin seismic network (SGBSN) recorded about 1050 earthquakes in the SGB, as compared to 1190 in 1989. Local magnitudes, M{sub L}, ranged from 0.0 for various earthquakes to 3.2 for an earthquake on April 3, 1990 5:47:58 UTC, 37.368{degrees} North, 117.358{degrees} West, Mud Lake, Nevada quadrangle. 95% of those earthquakes have the property, M{sub L} {le} 2.4. Within a 10 km radius of the center of Yucca Mountain, the site of a potential national,… more
Date: December 31, 1991
Creator: Harmsen, S. C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Radionuclide migration laboratory studies for validation of batch sorption data

Description: Advective and diffusive migration experiments (within the Dynamic Transport Column Experiments and Diffusion Studies of the Yucca Mountain Site Characterization Project) involve utilizing crushed material, intact, and fractured tuff in order to test and improve (if necessary) transport models by experimentally observing the migration of sorbing and non-sorbing radionuclides on a laboratory scale. Performing a validation of the sorption data obtained with batch techniques (within the Batch Sorpt… more
Date: December 31, 1991
Creator: Triay, I. R.; Mitchell, A. J. & Ott, M. A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Towards a realistic approach to validation of reactive transport models for performance assessment

Description: Performance assessment calculations are based on geochemical models that assume that interactions among radionuclides, rocks and groundwaters under natural conditions, can be estimated or bound by data obtained from laboratory-scale studies. The data include radionuclide distribution coefficients, measured in saturated batch systems of powdered rocks, and retardation factors measured in short-term column experiments. Traditional approaches to model validation cannot be applied in a straightforw… more
Date: December 31, 1993
Creator: Siegel, M. D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Ground-water recharge in Fortymile Wash near Yucca Mountain, Nevada, 1992--1993

Description: Quantification of the ground-water recharge from streamflow in the Fortymile Wash watershed will contribute to regional ground-water studies. Regional ground-water studies are an important component in the studies evaluating the ground-water flow system as a barrier to the potential migration of radionuclides from the potential underground high-level nuclear waste repository. Knowledge gained in understanding the ground-water recharge mechanisms and pathways in the Pah Canyon area, which is 10 … more
Date: December 31, 1994
Creator: Savard, C.S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The importance of secondary phases in glass corrosion

Description: The analytical expression used to model glass reaction in computer simulations such as EQ6 is compared to experiments used to support the simulations. The expression correctly predicts the acceleration observed in experiments performed at high glass surface area/leachant volume ratios (SA/V) upon the formation of secondary phases. High resolution microscopal analysis of reacted glass samples suggests that the accelerated nature of the reaction after secondary phase formation is due to changes i… more
Date: December 31, 1990
Creator: Ebert, W.L. & Bates, J.K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Characterization of porosity in support of mechanical property analysis

Description: Previous laboratory investigations of tuff have shown that porosity has a dominant, general effect on mechanical properties. As a result, it is very important for the interpretation of mechanical property data that porosity is measured on each sample tested. Porosity alone, however, does not address all of the issues important to mechanical behavior. Variability in size and distribution of pore space produces significantly different mechanical properties. A nondestructive technique for characte… more
Date: December 31, 1992
Creator: Price, R. H.; Martin, R. J., III & Boyd, P. J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Plant succession on disturbed sites in four plant associations in the Northern Mojave Desert

Description: The US Department of Energy (DOE) is characterizing Yucca Mountain Nevada, as a potential site for long-term underground storage of high-level nuclear waste. DOE is committed to reclaim all lands disturbed by the project, and return them to a stable ecological state, with a composition and productivity similar to predisturbance conditions. A study was implemented to assess plant species which naturally invade disturbed sites in the Yucca Mountain Project Area. In 1991 and 1992 study plots were … more
Date: December 31, 1993
Creator: Gabbert, W.D.; Schultz, B.W.; Angerer, J.P. & Ostler, W.K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Effects of soil quality and depth on seed germination and seedling survival at the Nevada test site

Description: The Nuclear Waste Policy Act, as amended in 1987, directs the US Department of Energy (DOE) to study Yucca Mountain, in southern Nevada, as a potential site for long-term storage of high-level nuclear waste. DOE policy mandates the restoration of all lands disturbed by site characterization activities and DOE has developed an environmental program that is to be implemented during site characterization activities at Yucca.Mountain. DOE is currently conducting reclamation feasibility trials as pa… more
Date: December 31, 1993
Creator: Blomquist, K.W. & Lyon, G.E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

A strategy for the derivation and use of sorption coefficients in performance assessment calculations for the Yucca Mountain site

Description: The chemical interactions of dissolved radionuclides with mineral surfaces along flowpaths from the proposed repository to the accessible environment around Yucca Mountain constitute one of the potential barriers to radionuclide migration at the site. Our limited understanding of these interactions suggests their details will be complex and will involve control by numerous chemical and physical parameters. It appears unlikely that we will understand all the details of these reactions or obtain … more
Date: December 31, 1990
Creator: Meijer, A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Scenario development for performance assessment: Some questions for the near-field modelers

Description: In an attempt to achieve completeness and consistency, the performance-assessment analyses developed by the Yucca Mountain Project are tied to scenarios described in event trees. Development of scenarios requires describing the constituent features, events, and processes in detail. Several features and processes occurring at the waste packages and the rock immediately surrounding the packages (i.e., the near field) have been identified: the effects of radiation on fluids in the near-field rock,… more
Date: December 31, 1992
Creator: Barr, G.E. & Barnard, R.W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

USDOE Office of Civilian Radioactive Waste Management quarterly report on program cost and schedule; Fourth Quarter, FY 1991

Description: This report is intended to provide a summary of the cost and schedule performance for the Civilian Radioactive Waste Management Program. Historical and current cost profiles (extracted from the DOE Financial Information System) are presented for each of the major program elements. Also included in this report are the program schedule baseline, the status of near-term program milestones and the status of the Nuclear Waste Fund revenues and disbursements. In particular, cost profile for the Yucca… more
Date: December 31, 1991
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Processed seismic motion records from Little Skull Mountain, Nevada earthquake of June 29, 1992, recorded at stations in southern Nevada

Description: As part of the contract with the US Department of Energy, Nevada Field Office (DOE/NV), URS/John A. Blume & Associates, Engineers (URS/Blume) maintains a network of seismographs in southern Nevada to monitor the ground motion generated by the underground nuclear explosions (UNEs) at the Nevada Test Site (NTS). The seismographs are located in the communities surrounding the NTS and the Las Vegas valley. When these seismographs are not used for monitoring the UNE generated motions, a limited numb… more
Date: December 31, 1992
Creator: Lum, P. K. & Honda, K. K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Land reclamation on the Nevada Test Site: A field tour

Description: An all-day tour to observe and land reclamation on the Nevada Test Site was conducted in conjunction with the 8th Wildland Shrub and Arid Land Restoration Symposium. Tour participants were introduced to the US Department of Energy reclamation programs for Yucca Mountain Site Characterization Project and Treatability Studies for Soil Media (TSSM) Project. The tour consisted of several stops that covered a variety of topics and studies including revegetation by seeding, topsoil stockpile stabiliz… more
Date: December 31, 1993
Creator: Winkel, V.K. & Ostler, W.K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Verification of a 1-dimensional model for predicting shallow infiltration at Yucca Mountain

Description: A characterization of net infiltration rates is needed for site-scale evaluation of groundwater flow at Yucca Mountain, Nevada. Shallow infiltration caused by precipitation may be a potential source of net infiltration. A 1-dimensional finite difference model of shallow infiltration with a moisture-dependant evapotranspiration function and a hypothetical root-zone was calibrated and verified using measured water content profiles, measured precipitation, and estimated potential evapotranspiratio… more
Date: December 31, 1994
Creator: Hevesi, Joseph A.; Flint, Alan L. & Flint, Lorraine E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Comparison of the Layer Structure of Vapor Phase and Leached SRL Glass by Use of AEM [Analytical Electron Microscopy]

Description: Test samples of 131 type glass that have been reacted for extended time periods in water vapor atmospheres of different relative humidities and in static leaching solution have been examined to characterize the reaction products. Analytical electron microscopy (AEM) was used to characterize the leached samples, and a complicated layer structure was revealed, consisting of phases that precipitate from solution and also form within the residual glass layer. The precipitated phases include birnes-… more
Date: December 31, 1989
Creator: Biwer, B. M.; Bates, J. K.; Abrajano, T. A., Jr. & Bradley, J. P.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Natural gels in the Yucca Mountain Area, Nevada, USA

Description: Relict gels at Yucca Mountain include pore- and fracture-fillings of silica and zeolite related to diagenetic and hydrothermal alteration of vitric tuffs. Water-rich free gels in fractures at Rainier Mesa consist of smectite with or without silica-rich gel fragments. Gels are being studied for their potential role in transport of radionuclides from a nuclear-waste repository.
Date: December 31, 1991
Creator: Levy, S.S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

The reaction of synthetic nuclear waste glass in steam and hydrothermal solution

Description: Glass monoliths of the WVCM 44, WVCM 50, SRL 165, and SRL 202 compositions were reacted in steam and in hydrothermal liquid at 200{degree}C. The glass reaction resulted in the formation of leached surface layers in both environments. The reaction in steam proceeds at a very low rate until precipitates form, after which the glass reaction proceeds at a greater rate. Precipitates were formed on all glass types reacted in steam. The assemblage of phases formed was unique to each glass type, but se… more
Date: December 31, 1989
Creator: Ebert, W.L. & Bates, J.K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Strontium isotope geochemistry of soil and playa deposits near Yucca Mountain, Nevada

Description: The isotopic composition of strontium contained in the carbonate fractions of soils provides an excellent tracer which can be used to test models for their origin. This paper reports data on surface coatings and cements, eolian sediments, playas and alluvial fan soils which help to constrain a model for formation of the extensive calcretes and fault infilling in the Yucca Mountain region. The playas contain carbonate with a wide range of strontium compositions; further work will be required to … more
Date: December 31, 1994
Creator: Marshall, B.D. & Mahan, S.A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Gravity and magnetic data of Fortymile Wash, Nevada Test Site, Nevada

Description: Gravity and ground magnetic data collected along six traverses across Fortymile Wash, in the southwest quadrant of the Nevada Test Site suggest that there are no significant vertical offsets below Fortymile Wash. The largest gravity and magnetic anomaly, in the vicinity of Fortymile Wash, is produced by the Paintbrush fault, on the west flank of Fran Ridge. Inferred vertical offset is about 250 {+-} 60 m (800 {+-} 200 ft). Geophysical data indicate that the fault is about 300 m (1,000 ft) east … more
Date: December 31, 1992
Creator: Ponce, D.A.; Kohrn, S.B. & Waddell, S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Yucca Mountain transportation routes: Preliminary characterization and risk analysis; Volume 2, Figures [and] Volume 3, Technical Appendices

Description: This report presents appendices related to the preliminary assessment and risk analysis for high-level radioactive waste transportation routes to the proposed Yucca Mountain Project repository. Information includes data on population density, traffic volume, ecologically sensitive areas, and accident history.
Date: May 31, 1991
Creator: Souleyrette, R.R. II; Sathisan, S.K. & di Bartolo, R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Modeling infiltration into a tuff matrix from a saturated vertical fracture

Description: Saturation profiles resulting from TOUGH2 numerical simulations of water infiltration into a tuff matrix from a saturated vertical fracture have been compared to experimental results. The purpose was to determine the sensitivity of the infiltration on local heterogeneities and different representations of two-phase characteristic curves used by the model. Findings indicate that the use of simplified (linearized) capillary pressure curves with rigorous (van Genuchten) relative permeability curve… more
Date: December 31, 1993
Creator: Ho, C.K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
Back to Top of Screen