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Sensitivity of the stability of a waste emplacement drift to variation in assumed rock joint parameters in welded tuff

Description: This report presents the results of a numerical analysis to determine the effects of variation of rock joint parameters on stability of waste disposal rooms for vertical emplacement. Conditions and parameters used were taken from the Nevada Nuclear Waste Storage Investigation (NNWSI) Project Site Characterization Plan Conceptual Design report (MacDougall et al., 1987). Mechanical results are presented which illustrate the predicted distribution of stress, joint slip, and room deformations for times of initial excavation and after 50 years heating. 82 refs., 93 figs.
Date: April 1, 1989
Creator: Christianson, M.
Partner: UNT Libraries Government Documents Department

Full-power test of a string of magnets comprising a half-cell of the Superconducting Super Collider

Description: In this paper we describe the full-powered operation of a string of industrially-fabricated magnets comprising a half-cell of the Superconducting Super Collider (SSC). The completion of these tests marks the first successful operation of a major SSC subsystem. The five 15-m long dipole magnets in the string had an aperture of 50 mm and the single 5-m long quadrupole aperture was 40 mm. Power and cryogenic connections were made to the string through spool pieces that are prototypes for SSC operations. The string was cooled to cryogenic temperatures in early July, 1992, and power tests were performed at progressively higher currents up to the nominal SSC operating point above 6500 amperes achieved in mid-August. In this paper we report on the electrical and cryogenic performance of the string components and the quench protection system during these initial tests.
Date: October 1, 1992
Creator: Burgett, W.; Christianson, M. & Coombes, R.
Partner: UNT Libraries Government Documents Department

UDEC simulation of Triaxial Testing of Lithophysal Tuff

Description: The current conceptual design for the proposed nuclear waste repository at Yucca Mountain Nevada includes placing most of the facility in lithophysal Tuff. Because it is difficult to conduct standard confined triaxial laboratory tests on lithophysal tuff, it was decided to use UDEC to conduct numerical triaxial testing of simulated lithophysal tuff samples to supplement existing uniaxial compression data. The results of these numerical experiments are intended to provide guidance on the variability of physical properties as a function of lithophysal porosity. These data can then be used as a basis for large scale modeling of the behavior of the repository drifts. The results of the numerical testing were encouraging and show consistent trends in tuff strength and overall performance as a function of lithophysal porosity.
Date: September 14, 2004
Creator: Christianson, M.; Board, M. & Rigby, D.
Partner: UNT Libraries Government Documents Department

Collider scenario implications of ASST Operation

Description: After the achievement of the SSCL`s Congressionally Mandated milestone, the Accelerator System String Test (ASST) half cell under went a series of power tests. These tests involved quenches induced in various configurations and in power levels up to the maximum operation point. These tests have produced data which has defined various parameters and requirements for the individual elements and system.
Date: May 1, 1993
Creator: McInturff, A.D.; Burgett, W. & Christianson, M.
Partner: UNT Libraries Government Documents Department

Subsurface Geotechnical Parameters Report

Description: The Yucca Mountain Project is entering a the license application (LA) stage in its mission to develop the nation's first underground nuclear waste repository. After a number of years of gathering data related to site characterization, including activities ranging from laboratory and site investigations, to numerical modeling of processes associated with conditions to be encountered in the future repository, the Project is realigning its activities towards the License Application preparation. At the current stage, the major efforts are directed at translating the results of scientific investigations into sets of data needed to support the design, and to fulfill the licensing requirements and the repository design activities. This document addresses the program need to address specific technical questions so that an assessment can be made about the suitability and adequacy of data to license and construct a repository at the Yucca Mountain Site. In July 2002, the U.S. Nuclear Regulatory Commission (NRC) published an Integrated Issue Resolution Status Report (NRC 2002). Included in this report were the Repository Design and Thermal-Mechanical Effects (RDTME) Key Technical Issues (KTI). Geotechnical agreements were formulated to resolve a number of KTI subissues, in particular, RDTME KTIs 3.04, 3.05, 3.07, and 3.19 relate to the physical, thermal and mechanical properties of the host rock (NRC 2002, pp. 2.1.1-28, 2.1.7-10 to 2.1.7-21, A-17, A-18, and A-20). The purpose of the Subsurface Geotechnical Parameters Report is to present an accounting of current geotechnical information that will help resolve KTI subissues and some other project needs. The report analyzes and summarizes available qualified geotechnical data. It evaluates the sufficiency and quality of existing data to support engineering design and performance assessment. In addition, the corroborative data obtained from tests performed by a number of research organizations is presented to reinforce conclusions derived from the pool of data gathered within ...
Date: December 17, 2003
Creator: Rigby, D.; Mrugala, M.; Shideler, G.; Davidsavor, T.; Leem, J.; Buesch, D. et al.
Partner: UNT Libraries Government Documents Department