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Creep in Topopah Spring Member welded tuff. Yucca Mountain Site Characterization Project

Description: A laboratory investigation has been carried out to determine the effects of elevated temperature and stress on the creep deformation of welded tuffs recovered from Busted Butte in the vicinity of Yucca Mountain, Nevada. Water saturated specimens of tuff from thermal/mechanical unit TSw2 were tested in creep at a confining pressure of 5.0 MPa, a pore pressure of 4.5 MPa, and temperatures of 25 and 250 C. At each stress level the load was held constant for a minimum of 2.5 {times} 10{sup 5} secon… more
Date: June 1, 1995
Creator: Martin, R. J., III; Boyd, P. J.; Noel, J. S. & Price, R. H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Site environmental report for calendar year 1994, Yucca Mountain Site, Nye County, Nevada.

Description: The Yucca Mountain Site Characterization office has established an environmental program to ensure that facilities are operated in order to protect, maintain, and restore environmental quality, minimize potential threats to the environment and the public, and comply with environmental policies and US DOE orders. The status of the environmental program has been summarized in this annual report to characterize performance, confirm compliance with environmental requirements, and highlight signific… more
Date: June 1, 1995
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Formulation and numerical analysis of nonisothermal multiphase flow in porous media

Description: A mathematical formulation is presented for describing the transport of air, water and energy through porous media. The development follows a continuum mechanics approach. The theory assumes the existence of various average macroscopic variables which describe the state of the system. Balance equations for mass and energy are formulated in terms of these macroscopic variables. The system is supplemented with constitutive equations relating fluxes to the state variables, and with transport prope… more
Date: June 1, 1995
Creator: Martinez, M.J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Radon concentration and working level in the Exploratory Studies Facility (ESF)

Description: Radon-222 ({sup 222}Rn) and {sup 222}Rn progeny WL monitoring in the Exploratory Studies Facility (ESF) was initiated to support regulatory compliance. Measurements were taken over two periods, in Test Alcove No. 1 of the ESF, about 60 m from the tunnel entrance. For both periods, {sup 222}Rn concentration was less than 10% of the Derived Air Concentration (DAC) set forth in DOE Order 5480.11. Thus, these assessments were sufficient to demonstrate regulatory compliance. Based on these findings,… more
Date: June 1, 1995
Creator: Stiver, J.H. & Tung, Chao-Hsiung
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Selection of a preferred initial access for the exploratory studies facility

Description: An issue of interest to the Yucca Mountain Site Characterization Project Office (YMPO) has been selection of the preferred location for initial access to the Exploratory Studies Facility (ESF) in the event that the U.S. Department of Energy (DOE) elected to proceed with a phased approach to facility development. A task force to conduct an assessment and prepare a recommendation of the preferred initial location (north or south) for starting underground in situ tests at Yucca Mountain was initia… more
Date: June 1995
Creator: Boak, D. M.; Cikanek, E. M. & Elkins, N. Z.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Technical Data Catalog: Yucca Mountain Site Characterization Project. Quarterly supplement

Description: This report presents reference information contained in the Yucca Mountain Project Automated Technical Data Tracking System. The Department of Energy is seeking to design and maintain a geologic repository for the disposal of high-level radioactive wastes. However, before this repository can be built, the DOE must first do a comprehensive site evaluation. This evaluation is subject to many regulations. This report fulfills the reporting requirements of the Site-Specific Procedural Agreement for… more
Date: June 30, 1995
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Preliminary evaluation of techniques for transforming regional climate model output to the potential repository site in support of Yucca Mountain future climate synthesis

Description: The report describes a preliminary evaluation of models for transforming regional climate model output from a regional to a local scale for the Yucca Mountain area. Evaluation and analysis of both empirical and numerical modeling are discussed which is aimed at providing site-specific, climate-based information for use by interfacing activities. Two semiempirical approaches are recommended for further analysis.
Date: June 1, 1995
Creator: Church, H.W.; Zak, B.D. & Behl, Y.K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Anisotropy of mechanical properties of tuff at Yucca Mountain

Description: The purpose of this study is to investigate anisotropy of mechanical properties, namely, compressive strength and modulus, for Tiva Canyon welded tuff from the starter tunnel at Yucca Mountain. Mechanical properties of Tiva Canyon Tuff are needed for the design of the ramps and drifts within the Tiva Canyon horizon. Approximately one cubic foot block samples, all of which were from the thermo -- mechanical unit TCw, were obtained from a muck pile containing excavated rock from the starter tunne… more
Date: June 1, 1995
Creator: Karakouzian, M. & Hudyma, N.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Summary evaluation of Yucca Mountain surface transects with implications for downhole sampling. Yucca Mountain Site Characterization Project

Description: The results of previously completed vertical outcrop sampling transacts are summarized with respect to planning downhole sampling. The summary includes statistical descriptions and descriptions of the spatial variability of the sampled parameters. Descriptions are made on each individual transect, each thermal/mechanical unit and each previously defined geohydrologic unit. Correlations between parameters indicate that saturated hydraulic conductivity is not globally correlated to porosity. The … more
Date: June 1, 1995
Creator: McKenna, S. A. & Rautman, C. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Preliminary seismicity and focal mechanisms for the southern Great Basin of Nevada and California: January 1992 through September 1992

Description: The telemetered southern Great Basin seismic network (SGBSN) is operated for the Department of Energy`s Yucca Mountain Project (YMP). The US Geological Survey, Branch of Earthquake and Landslide Hazards, maintained this network until September 30, 1992, at which time all operational and analysis responsibilities were transferred to the University of Nevada at Reno Seismological Laboratory (UNRSL). This report contains preliminary earthquake and chemical explosion hypocenter listings and prelimi… more
Date: June 1, 1994
Creator: Harmsen, S.C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Molecular models for actinide speciation

Description: Much effort has been devoted to the development of sensitive spectroscopic techniques for the study of actinide speciation based on the sensitivity of f-f electronic absorption bands to oxidation state and ligation of the actinide ions. These efforts assume that data obtained in such studies will be interpretable in terms of changes in complexation of the metal center. However, the current understanding of 5f electronic structure is based on data from solid state doped single crystals. In those… more
Date: June 1, 1994
Creator: Clark, D. L.; Watkin, J. G.; Morris, D. E. & Berg, J. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Evaluation and compilation of DOE waste package test data; Volume 8: Biannual report, August 1989--January 1990

Description: This report summarizes evaluations by the National Institute of Standards and Technology (NIST) of some of the Department of Energy (DOE) activities on waste packages designed for containment of radioactive high-level nuclear waste (HLW) for the six-month period, August 1989--January 1990. This includes reviews of related materials research and plans, information on the Yucca Mountain, Nevada disposal site activities, and other information regarding supporting research and special assistance. S… more
Date: June 1, 1993
Creator: Interrante, C. G.; Fraker, A. C. & Escalante, E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Corrosion of copper-based materials in irradiated moist air systems

Description: The atmospheric corrosion of oxygen-free copper (CDA-102), 70/30 copper-nickel (CDA-715), and 7% aluminum bronze (CDA-613) in an irradiated moist air environment was investigated. Experiments were performed in both dry and 40% RH (@90{degree}C) air at temperatures of 90 and 150{degree}C. Initial corrosion rates were determined based on a combination of weight gain and weight loss measurements. Corrosion products observed were identified. These experiments support efforts by the Yucca Mountain P… more
Date: June 1, 1991
Creator: Reed, D.T. & Van Konynenburg, R.A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Expert judgment in assessing radwaste risks: What Nevadans should know about Yucca Mountain; [Final report]

Description: For phenomena characterized by accurate and largely complete data, quantitative risk assessment (QRA) provides extraordinarily valuable and objective information. However, with phenomena for which the data, models, or probabilities are incomplete or uncertain, QRA may be less useful and more questionable, because its conclusions are typically empirically and theoretically underdetermined. In the face of empirical or theoretical underdetermination, scientists often are forced to make a number of… more
Date: June 1, 1992
Creator: Shrader-Frechette, K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Statistical test of reproducibility and operator variance in thin-section modal analysis of textures and phenocrysts in the Topopah Spring member, drill hole USW VH-2, Crater Flat, Nye County, Nevada

Description: A thin-section operator-variance test was given to the 2 junior authors, petrographers, by the senior author, a statistician, using 16 thin sections cut from core plugs drilled by the US Geological Survey from drill hole USW VH-2 standard (HCQ) drill core. The thin sections are samples of Topopah Spring devitrified rhyolite tuff from four textural zones, in ascending order: (1) lower nonlithophysal, (2) lower lithopysal, (3) middle nonlithophysal, and (4) upper lithophysal. Drill hole USW-VH-2 … more
Date: June 1989
Creator: Moore, L. M.; Byers, F. M., Jr. & Broxton, D. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Preclosure radiological safety analysis for accident conditions of the potential Yucca Mountain Repository: Underground facilities; Yucca Mountain Site Characterization Project

Description: This preliminary preclosure radiological safety analysis assesses the scenarios, probabilities, and potential radiological consequences associated with postulated accidents in the underground facility of the potential Yucca Mountain repository. The analysis follows a probabilistic-risk-assessment approach. Twenty-one event trees resulting in 129 accident scenarios are developed. Most of the scenarios have estimated annual probabilities ranging from 10{sup {minus}11}/yr to 10{sup {minus}5}/yr. T… more
Date: June 1, 1992
Creator: Ma, C. W.; Sit, R. C.; Zavoshy, S. J.; Jardine, L. J. & Laub, T. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Assessment of engineered barrier system and design of waste packages

Description: The US Nuclear Regulatory Commission has established two post-closure performance objectives for the Engineered Barrier System (EBS) in a geologic repository. These require containment of the waste followed by controlled release. The EBS for a repository in unsaturated tuff at Yucca Mountain is designed to meet these performance objectives. The major components are the waste form, container, air gap, and borehole liner. Assessment of post-closure performance of the EBS is based on allocating pe… more
Date: June 1, 1988
Creator: Ramspott, L.D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Mechanical Characterization of Densely Welded Apache Leap Tuff

Description: An empirical criterion is formulated to describe the compressive strength of the densely welded Apache Leap tuff. The criterion incorporates the effects of size, L/D ratio, loading rate and density variations. The criterion improves the correlation between the test results and the failure envelope. Uniaxial and triaxial compressive strengths, Brazilian tensile strength and elastic properties of the densely welded brown unit of the Apache Leap tuff have been determined using the ASTM standard te… more
Date: June 1, 1991
Creator: Fuenkajorn, K. & Daemen, J. J. K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Critical assessment of seismic and geomechanics literature related to a high-level nuclear waste underground repository

Description: A comprehensive literature assessment has been conducted to determine the nature and scope of technical information available to characterize the seismic performance of an underground repository and associated facilities. Significant deficiencies were identified in current practices for prediction of seismic response of underground excavations in jointed rock. Conventional analytical methods are based on a continuum representation of the host rock mass. Field observations and laboratory experim… more
Date: June 1991
Creator: Kana, D. D.; Vanzant, B. W.; Nair, P. K. & Brady, B. H. G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Survey of the degradation modes of candidate materials for high-level radioactive waste disposal containers

Description: Oxidation and atmospheric corrosion data suggest that addition of Cr provides the greatest improvement in oxidation resistance. Cr-bearing cast irons are resistant to chloride environments and solutions containing strongly oxidizing constituents. Weathering steels, including high content and at least 0.04% Cu, appear to provide adequate resistance to oxidation under temperate conditions. However, data from long-term, high-temperature oxidation studies on weathering steels were not available. Fr… more
Date: June 1, 1995
Creator: Vinson, D. W.; Nutt, W. M. & Bullen, D. B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Estimation of hydraulic conductivities of Yucca Mountain tuffs from sorptivity and water retention measurements

Description: The hydraulic conductivity functions of the matrix rocks at Yucca Mountain, Nevada, are among the most important data needed as input for the site-scale hydrological model of the unsaturated zone. The difficult and time-consuming nature of hydraulic conductivity measurements renders it infeasible to directly measure this property on large numbers of cores. Water retention and sorptivity measurements, however, can be made relatively rapidly. The sorptivity is, in principle, a unique functional o… more
Date: June 1, 1995
Creator: Zimmerman, R.W. & Bodvarsson, G.S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Radioelements and their occurrence with secondary minerals in heated and unheated tuff at the Nevada Test Site

Description: Samples of devitrified welded tuff near and away from the site of a heater test in Rainier Mesa were examined with regard to whole-rock radioelement abundances, microscopic distribution of U, and oxygen isotope ratios. Wholerock U averages between 4 and 5 ppM, and U is concentrated at higher levels secondary opaque minerals as well as in accessory grains. U in primary and secondary sites is most commonly associated with Mn phases, which average {approximately}30 ppM U in more uraniferous occurr… more
Date: June 1, 1992
Creator: Flexser, S. & Wollenberg, H.A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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On the movement of a liquid front in an unsaturated, fractured porous medium, Part 1

Description: The primary aim of this paper is to present approximate analytical solutions of the fracture flow which gives the position of the liquid fracture front as a function of time. These solutions demonstrate that the liquid movement in the fracture can be classified into distinctive time periods, or flow regimes. It is also shown that when plotted versus time using a log-log scale, the liquid fracture front position asymptotically approaches a series of line segments. Two-dimensional numerical simul… more
Date: June 1, 1989
Creator: Nitao, J. J. & Buscheck, T. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Challenges in defining a radiologic and hydrologic source term for underground nuclear test centers, Nevada Test Site, Nye County, Nevada

Description: The compilation of a radionuclide inventory for long-lived radioactive contaminants residual from nuclear testing provides a partial measure of the radiologic source term at the Nevada Test Site. The radiologic source term also includes potentially mobile short-lived radionuclides excluded from the inventory. The radiologic source term for tritium is known with accuracy and is equivalent to the hydrologic source term within the saturated zone. Definition of the total hydrologic source term for … more
Date: June 1, 1995
Creator: Smith, D. K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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