10 Matching Results

Search Results

Results: 1 - 10
open access

Electrical properties of tuff from the ESF as a function of water saturation and temperature

Description: The electrical properties of partially saturated tuff provide information about the microstructure of the matrix and how water is distributed within the pore space as the material undergoes saturation and desaturation cycles. Understanding electrical properties as a function of saturation and temperature is also important because the determination of water saturation during field tests and laboratory experiments depends of reliable laboratory data. Spatial distribution and temporal variation of… more
Date: January 1, 1998
Creator: Roberts, J. J.; Carlberg, E. & Lin, W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Report on laboratory scale thermally-coupled processes experiments

Description: Yucca Mountain Site Characterization Project (YMP) is studying Yucca Mountain, Nevada as a potential repository for high-level nuclear wastes. The studies include predictions of the quantity and composition of water in the repository near-field environment that will affect the release rate of radioactive nuclides from waste packages, and the transport of the nuclides through the rock mass adjacent to these packages. The radioactive decay heat from the high- level nuclear waste may increase the … more
Date: February 1, 1998
Creator: Lin, W.; Roberts, J. J. & Wildenschild, D. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Influence of microstructural properties on geophysical measurements in sand-clay mixtures

Description: We have performed a series of laboratory experiments on saturated sand-clay mixtures. Measurements include frequency-dependent electrical properties using the four-electrode technique (10 niHz to 1 MHz), permeability, porosity, and acoustic velocities. We mixed clean Ottawa (quartz) sand with Na-montmorillonite (Wyoming bentonite) in a number of different configurations containing 0 to 10% clay: as a dispersed mixture, as discrete clay clusters, and arranged in distinct layers. Solutions of CaC… more
Date: November 30, 1998
Creator: Carlberg, E. D.; Roberts, J. J. & Wildenschild, D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Report on laboratory tests of drying and re-wetting of intact rocks from the drift scale and single heater tests

Description: The primary focus of this report is the measurement of moisture retention curves of tuff as a function of temperature for both drying and re-wetting conditions. The report contains descriptions of experimental designs and procedures, data, observation, preliminary analyses, and future work. Knowledge of unsaturated transport properties is critical for understanding the movement of water through the unsaturated zone. Evaluation of the performance of a potential nuclear waste repository also depe… more
Date: January 1, 1998
Creator: Roberts, J. J.; Carlberg, E.; Pletcher, R. & Lin, W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Vitrification development and experiences at Fernald, Ohio

Description: Vitrification of radioactive wastes products have proven to produce an extremely stable waste form. Vitrification involves the melting of wastes with a mixture of glass-forming additives at high temperatures; when cooled, the wastes are incorporated into a glass that is analogous to obsidian. Obsidian is a volcanic glass-like rock, commonly found in nature. A one-metric ton/day Vitrification Pilot Plant (VITPP) at Fernald, Ohio, simulated the vitrification of radium and radon bearing silo resid… more
Date: September 1, 1998
Creator: Gimpel, R.F.; Paine, D.; Roberts, J.L. & Akgunduz, N.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Joint inversion of geophysical data for site characterization and restoration monitoring. 1998 annual progress report

Description: 'The purpose of this project is to develop a computer code for joint inversion of seismic and electrical data, to improve underground imaging for site characterization and remediation monitoring. The computer code developed in this project will invert geophysical data to obtain direct estimates of porosity and saturation underground, rather than inverting for seismic velocity and electrical resistivity or other geophysical properties. This is intended to be a significant improvement in the stat… more
Date: June 1, 1998
Creator: Berge, P. A.; Roberts, J. J.; Berryman, J. G. & Wildenschild, D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Fracture/matrix flow experiments results

Description: The impact of vapor diffusion and its potential enhancement are of concern with respect to the performance of the potential nuclear waste repository at Yucca Mountain. Under non-isothermal conditions, such as those prevailing in the near-field environment, gas-phase diffusion of water vapor (a condensable component) may be enhanced as compared to isothermal conditions. Two main phenomena are responsible for this enhancement (Philip and DeVries 1957, p. 226). Normally, diffusive transport of wat… more
Date: September 30, 1998
Creator: Constantino, M. S.; Wildenschild, D.; Roberts, J. J.; Kneafsey, T. J. & Lin, W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Hydrothermal processing of radioactive combustible waste

Description: Hydrothermal processing has been demonstrated for the treatment of radioactive combustible materials for the US Department of Energy. A hydrothermal processing system was designed, built and tested for operation in a plutonium glovebox. Presented here are results from the study of the hydrothermal oxidation of plutonium and americium contaminated organic wastes. Experiments show the destruction of the organic component to CO{sub 2} and H{sub 2}O, with 30 wt.% H{sub 2}O{sub 2} as an oxidant, at … more
Date: September 1, 1998
Creator: Worl, L. A.; Buelow, S. J.; Harradine, D.; Le, L.; Padilla, D. D. & Roberts, J. H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Lattice effects in the light actinides

Description: The light actinides show a variety of lattice effects that do not normally appear in other regions of the periodic table. The article will cover the crystal structures of the light actinides, their atomic volumes, their thermal expansion behavior, and their elastic behavior as reflected in recent thermal vibration measurements made by neutron diffraction. A discussion of the melting points will be given in terms of the thermal vibration measurements. Pressure effects will be only briefly indica… more
Date: December 1998
Creator: Lawson, A. C.; Cort, B.; Roberts, J. A.; Bennett, B. I.; Brun, T. O.; Von Dreele, R. B. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
Back to Top of Screen