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MINED GEOLOGIC DISPOSAL SYSTEM (MGDS) MONITORING & CONTROL SYSTEMS CENTRALIZATION TECHNICAL REPORT

Description: The objective of this report is to identify and document Mined Geologic Disposal System (MGDS) requirements for centralized command and control. Additionally, to further develop the MGDS monitoring and control functions. This monitoring and control report provides the following information: (1) Determines the applicable requirements for a monitoring and control system for repository operations and construction (excluding Performance Confirmation). (2) Makes a determination as to whether or not … more
Date: March 31, 1998
Creator: McGrath, M.J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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A triple-continuum approach for modeling flow and transportprocesses in fractured rock

Description: This paper presents a triple-continuum conceptual model forsimulating flow and transport processes in fractured rock. Field datacollected from the unsaturated zone of Yucca Mountain, a repository siteof high-level nuclear waste, show a large number of small-scalefractures. The effect of these small fractures has not been considered inprevious modeling investigations within the context of a continuumapproach. A new triple-continuum model (consisting of matrix,small-fracture, and large-fracture c… more
Date: August 31, 2001
Creator: Wu, Yu-Shu; Liu, H. H.; Bodvarsson, G. S. & Zellmer, K. E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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An integrated methodology for characterizing flow and transport processes in fractured rock

Description: To investigate the coupled processes involved in fluid andheat flow and chemical transport in the highly heterogeneous,unsaturated-zone (UZ) fractured rock of Yucca Mountain, we present anintegrated modeling methodology. This approach integrates a wide varietyof moisture, pneumatic, thermal, and geochemical isotopic field data intoa comprehensive three-dimensional numerical model for modeling analyses.The results of field applications of the methodology show that moisturedata, such as water pot… more
Date: August 31, 2007
Creator: Wu, Yu-Shu
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Effects of Heat Treatment and Formulation on the Phase Composition and Chemical Durability of the EBR-Ll Ceramic Waste Form.

Description: High-level radioactive waste salts generated during the electrometallurgical treatment of spent sodium-bonded nuclear fuel from the Experimental Breeder Reactor-II will be immobilized in a ceramic waste form (CWF). Tests are being conducted to evaluate the suitability of the CWF for disposal in the planned federal high-level radioactive waste repository at Yucca Mountain. In this report, the results of laboratory tests and analyses conducted to address product consistency and thermal stability … more
Date: January 31, 2006
Creator: Ebert, W. E.; Dietz, N. L. & Janney, D. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Testing to evaluate the suitability of waste forms developed for electrometallurgically treated spent sodium-bonded nuclear fuel for disposal in the Yucca Mountain reporsitory.

Description: The results of laboratory testing and modeling activities conducted to support the development of waste forms to immobilize wastes generated during the electrometallurgical treatment of spent sodium-bonded nuclear fuel and their qualification for disposal in the federal high-level radioactive waste repository are summarized in this report. Tests and analyses were conducted to address issues related to the chemical, physical, and radiological properties of the waste forms relevant to qualificati… more
Date: January 31, 2006
Creator: Ebert, W. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Bomb-Pulse Chlorine-36 at the Proposed Yucca Mountain Repository Horizon: An Investigation of Previous Conflicting Results and Collection of New Data

Description: Previous studies Los Alamos National Laboratory (LANL) found elevated ratios of chlorine-36 to total chloride (36Cl/Cl) in samples of rock collected from the Exploratory Studies Facility (ESF) at Yucca Mountain (YM). The data were interpreted as an indication that fluids containing “bomb-pulse” 36Cl reached the repository horizon in the ~50 years since the peak period of above-ground nuclear testing. Due to the significance of 36Cl data to conceptual models of unsaturated zone flow, the United … more
Date: July 31, 2006
Creator: Cizdziel, James
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Modeling Temporal-Spatial Earthquake and Volcano Clustering at Yucca Mountain, Nevada

Description: The proposed national high-level nuclear repository at Yucca Mountain is close to Quaternary faults and cinder cones. The frequency of these events is low, with indications of spatial and temporal clustering, making probabilistic assessments difficult. In an effort to identify the most likely intrusion sites, we based a 3D finite element model on the expectation that faulting and basalt intrusions are primarily sensitive to the magnitude and orientation of the least principal stress in extensio… more
Date: May 31, 2006
Creator: Parsons, T.; Thompson, G.A. & Cogbill, A.H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

High-Precision Isotope Analysis Of Uranium And Thorium By Tims

Description: The U.S. Geological Survey (USGS) Yucca Mountain Project Branch laboratory in Denver, Colorado, conducts routine high-precision isotope analyses of uranium (U) and thorium (Th) using thermal ionization mass-spectrometry (TIMS). The measurements are conducted by a solid-source mass-spectrometer equipped with a Faraday multi-collector system and an energy filter in front of an active-film-type secondary electron multiplier (SEM). The abundance sensitivity of the instrument (signal at mass 237 ove… more
Date: August 31, 2006
Creator: Neymark, L.A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Modeling Coupled Processes in Clay Formations for Radioactive Waste Disposal

Description: As a result of the termination of the Yucca Mountain Project, the United States Department of Energy (DOE) has started to explore various alternative avenues for the disposition of used nuclear fuel and nuclear waste. The overall scope of the investigation includes temporary storage, transportation issues, permanent disposal, various nuclear fuel types, processing alternatives, and resulting waste streams. Although geologic disposal is not the only alternative, it is still the leading candidate… more
Date: August 31, 2010
Creator: Liu, Hui-Hai; Rutqvist, Jonny; Zheng, Liange; Sonnenthal, Eric; Houseworth, Jim & Birkholzer, Jens
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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

Massively parallel computing simulation of fluid flow in the unsaturated zone of Yucca Mountain, Nevada

Description: This paper presents the application of parallel computing techniques to large-scale modeling of fluid flow in the unsaturated zone (UZ) at Yucca Mountain, Nevada. In this study, parallel computing techniques, as implemented into the TOUGH2 code, are applied in large-scale numerical simulations on a distributed-memory parallel computer. The modeling study has been conducted using an over-one-million-cell three-dimensional numerical model, which incorporates a wide variety of field data for the h… more
Date: August 31, 2001
Creator: Zhang, Keni; Wu, Yu-Shu & Bodvarsson, G. S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Development of numerical Grids for UZ Flow and Transport Modeling

Description: This report describes the methods used to develop numerical grids of the unsaturated hydrogeologic system beneath Yucca Mountain, Nevada. Numerical grid generation is an integral part of the development of the unsaturated zone (UZ) flow and transport model, a complex, three-dimensional (3-D) model of Yucca Mountain. This revision contains changes made to improve the clarity of the description of grid generation. The numerical grids, developed using current geologic, hydrogeologic, and mineralog… more
Date: August 31, 2004
Creator: Dobson, P.
Item Type: Refine your search to only Report
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

Near-drift thermal analysis including combined modes of conduction, convection, and radiation

Description: The performance of waste packages containing high-level nuclear wastes at underground repositories such as the potential repository at Yucca Mountain, Nevada, depends, in part, on the thermodynamic environment immediately surrounding the buried waste packages. For example, degradation of the waste packages can be caused by corrosive and microbial processes, which are influenced by both the relative humidity and temperature within the emplacement drifts. In this paper, the effects of conduction,… more
Date: December 31, 1995
Creator: Ho, C.K. & Francis, N.D.
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
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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
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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

Sensitivity studies of unsaturated groundwater flow modeling for groundwater travel time calculations at Yucca Mountain, Nevada

Description: Unsaturated flow has been modeled through four cross-sections at Yucca Mountain, Nevada, for the purpose of determining groundwater particle travel times from the potential repository to the water table. This work will be combined with the results of flow modeling in the saturated zone for the purpose of evaluating the suitability of the potential repository under the criteria of 10CFR960. One criterion states, in part, that the groundwater travel time (GWTT) from the repository to the accessib… more
Date: December 31, 1995
Creator: Altman, S. J.; Ho, C. K.; Arnold, B. W. & McKenna, S. A.
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
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