90,417 Matching Results

Results open in a new window/tab.

Early identification of technical issues: a sensitivity study to check LISTRA1A internal consistency and structure (open access)

Early identification of technical issues: a sensitivity study to check LISTRA1A internal consistency and structure

This report describes a sensitivity study using LISTRA1A, a model for use in the development of a long-range, time-dependent plan for licensing nuclear waste repositories. The objectives of the model are: (1) to provide information concerning the impact of various licensing strategies on the ability to dispose of nuclear waste effectively; and (2) to provide long-range budget forecasts for differing strategies of the Nuclear Regulatory Commission (NRC) and the Department of Energy (DOE). The model is designed to analyze the interaction between NRC regulatory policy and DOE technical programs. A sensitivity study is reported for a single parameter in a hypothetical review process.
Date: December 13, 1979
Creator: Harvey, T. F.; Maninger, R. C. & Rabsatt, S.
Object Type: Report
System: The UNT Digital Library
Modeling beam-front dynamics at low gas pressures (open access)

Modeling beam-front dynamics at low gas pressures

The dynamics of space charge neutralization at the front of an intense self-focused electron beam pulse exhibits important differences in different gas pressure regimes. At very low pressures, the beam front is in the so-called ion-focused regime (IFR) where all secondary electrons are expelled from the beam region by the radial electric field without causing significant additional ionization. We estimate the upper pressure boundary of this regime by considering the distance scale length for cascade (avalanche) ionization. Data from the FX-25 diode experiments indicate a critical transition pressure (P/sub c/) that agrees with this estimate and with its scaling among various gas types. Normal mobility-limited treatments (local conductivity models) of the secondary electrons at the beam front are not justified until the gas pressure is 10 to 50 times higher than P/sub c/, due to runaway of these secondary electrons in the strong space-charge electric field at the lower pressures. The main conclusion of this study is that a non-local phase space (Boltzmann) treatment of the secondary electrons is required to accurately describe these different beam front regimes and the transitions between them; such a code model is currently under development.
Date: May 13, 1982
Creator: Briggs, R. J. & Yu, S.
Object Type: Report
System: The UNT Digital Library
L-shell photoabsorption spectroscopy for solid metals: Ti, V, Cr, Fe, Ni, Cu (open access)

L-shell photoabsorption spectroscopy for solid metals: Ti, V, Cr, Fe, Ni, Cu

Synchrotron radiation measurements of near-threshold and broad-range (400--1500 eV) absolute photoabsorption cross sections were made for five transition metals with {plus minus}10% overall uncertainties. Fine structure details of 2p-3d autoionizing resonances are shown with better than 1.0 eV resolution for solid metals: Ti, V, Cr, Fe, Ni, and Cu. Fine structure similar to what we measured can be produced using a multi-configuration Dirac Fock (MCDF) model if a statistical distribution is assumed for the initial atomic states. Calculations were performed in intermediate coupling with configuration interactions by Mau H. Chen. The results are compared with other experimental work and theoretical methodologies. 18 refs., 7 figs.
Date: September 13, 1989
Creator: Del Grande, N.K. (Lawrence Livermore National Lab., CA (USA))
Object Type: Article
System: The UNT Digital Library
CRITICALITY EXCURSION OF NOVEMBER 10, 1961 (open access)

CRITICALITY EXCURSION OF NOVEMBER 10, 1961

A criticality excursion occurred at the Oak Ridge Critical Experiments Laboratory on November l0, l961 as enriched uranium metal, neutron reflected and moderated by hydrogen, was being assembled. It is estimated that the energy yield was between 10/sup 15/ and 10/sup 16/ fissions. There was no personnel exposure or property damage. Fission product contamination, both airborne and contained in the metal, decayed sufficiently overnight to allow unhindered continuation of the experiment. The excursion was caused by a too rapid approach of the two sections of uranium constituting the experiment. (auth)
Date: February 13, 1962
Creator: Callihan, D.
Object Type: Report
System: The UNT Digital Library
[News Clip: Simpson] captions transcript

[News Clip: Simpson]

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date: December 13, 1994, 10:00 p.m.
Creator: KXAS-TV (Television station : Fort Worth, Tex.)
Object Type: Video
System: The UNT Digital Library
[News Clip: Mansfield murder] captions transcript

[News Clip: Mansfield murder]

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date: February 13, 1994, 10:00 p.m.
Creator: KXAS-TV (Television station : Fort Worth, Tex.)
Object Type: Video
System: The UNT Digital Library
[News Clip: YMCA trial] captions transcript

[News Clip: YMCA trial]

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date: April 13, 1994, 5:00 p.m.
Creator: KXAS-TV (Television station : Fort Worth, Tex.)
Object Type: Video
System: The UNT Digital Library
[News Clip: Crime bill] captions transcript

[News Clip: Crime bill]

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date: August 13, 1994, 10:00 p.m.
Creator: KXAS-TV (Television station : Fort Worth, Tex.)
Object Type: Video
System: The UNT Digital Library
[News Clip: FW crime] captions transcript

[News Clip: FW crime]

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date: October 13, 1994, 6:00 p.m.
Creator: KXAS-TV (Television station : Fort Worth, Tex.)
Object Type: Video
System: The UNT Digital Library
[News Clip: Stamp] captions transcript

[News Clip: Stamp]

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date: February 13, 1994, 10:00 p.m.
Creator: KXAS-TV (Television station : Fort Worth, Tex.)
Object Type: Video
System: The UNT Digital Library
Technical evaluation report on the proposed design modifications and technical specification changes on grid voltage degradation for the Millstone Nuclear Power Station, Unit 1 (open access)

Technical evaluation report on the proposed design modifications and technical specification changes on grid voltage degradation for the Millstone Nuclear Power Station, Unit 1

This report documents the technical evaluation of the proposed design modifications and Technical Specification change for protection of Class 1E equipment from grid voltage degradation for the Millstone Nuclear Power Station, Unit 1. The review criteria are based on several IEEE standards and the Code of Federal Regulations. The evaluation finds that the licensee has not provided sufficient information on the undervoltage protection system to allow a complete evaluation into the adequacy of protecting the Class 1E equipment from sustained voltage degradation.
Date: May 13, 1982
Creator: Selan, J.C.
Object Type: Report
System: The UNT Digital Library
[News Clip: Miller FOLLO] captions transcript

[News Clip: Miller FOLLO]

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date: August 13, 1994, 6:00 p.m.
Creator: KXAS-TV (Television station : Fort Worth, Tex.)
Object Type: Video
System: The UNT Digital Library
[News Clip: Menendez] captions transcript

[News Clip: Menendez]

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date: January 13, 1994, 10:00 p.m.
Creator: KXAS-TV (Television station : Fort Worth, Tex.)
Object Type: Video
System: The UNT Digital Library
[News Clip: Garland cop] captions transcript

[News Clip: Garland cop]

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date: September 13, 1994, 10:00 p.m.
Creator: KXAS-TV (Television station : Fort Worth, Tex.)
Object Type: Video
System: The UNT Digital Library
[News Clip: Blair trial] captions transcript

[News Clip: Blair trial]

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date: September 13, 1994, 10:00 p.m.
Creator: KXAS-TV (Television station : Fort Worth, Tex.)
Object Type: Video
System: The UNT Digital Library
[News Clip: Flooding] captions transcript

[News Clip: Flooding]

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date: May 13, 1994, 10:00 p.m.
Creator: KXAS-TV (Television station : Fort Worth, Tex.)
Object Type: Video
System: The UNT Digital Library
[News Clip: Flooding] captions transcript

[News Clip: Flooding]

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date: April 13, 1994, 10:00 p.m.
Creator: KXAS-TV (Television station : Fort Worth, Tex.)
Object Type: Video
System: The UNT Digital Library
[News Clip: Houston lighting] captions transcript

[News Clip: Houston lighting]

B-roll video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date: May 13, 1994, 5:00 p.m.
Creator: KXAS-TV (Television station : Fort Worth, Tex.)
Object Type: Video
System: The UNT Digital Library
[News Clip: Clinton] captions transcript

[News Clip: Clinton]

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date: November 13, 1994, 5:30 p.m.
Creator: KXAS-TV (Television station : Fort Worth, Tex.)
Object Type: Video
System: The UNT Digital Library
[News Clip: New sun] captions transcript

[News Clip: New sun]

B-roll video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date: June 13, 1994, 5:00 p.m.
Creator: KXAS-TV (Television station : Fort Worth, Tex.)
Object Type: Video
System: The UNT Digital Library
[News Clip: Garland cop] captions transcript

[News Clip: Garland cop]

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date: September 13, 1994, 5:00 p.m.
Creator: KXAS-TV (Television station : Fort Worth, Tex.)
Object Type: Video
System: The UNT Digital Library
STATUS REPORT NO. 2 ON CLINCH RIVER STUDY (open access)

STATUS REPORT NO. 2 ON CLINCH RIVER STUDY

None
Date: April 13, 1962
Creator: Morton, R.J. ed.
Object Type: Report
System: The UNT Digital Library
Research and Development Activities Fixation of Radioactive Residues Quarterly Progress Report, July-September 1961 (open access)

Research and Development Activities Fixation of Radioactive Residues Quarterly Progress Report, July-September 1961

Progress is reported on research and development work in pot calcination and radiant-heat spray calcination studies of synthetic Purex high-level wastes; and sorption studies using synthetic minerals and resins as well as natural minerals. The calcination studies are discussed in terms of batch calcination, melting of pot calcination products, spray calcination, and off-gas treatment; and sorption studies in terms of mineral reactions, fixation chemistry, and condensate wastes. (B.O.G.)
Date: October 13, 1961
Creator: Irish, E.R. ed.
Object Type: Report
System: The UNT Digital Library
Field electrochemical measurements of corrosion characteristics of materials in hypersaline geothermal brine (open access)

Field electrochemical measurements of corrosion characteristics of materials in hypersaline geothermal brine

A flow cell (with appropriate accessories) was developed for use in short-term testing of the corrosion behavior of materials in approximately 100{sup 0}C, hypersaline geothermal brine. The apparatus was designed to accommodate commercial (Petrolite) corrosion measurement equipment and conducted experiments on-line at the Lawrence Livermore Laboratory Test Station in the Salton Sea Geothermal Field. The apparatus also permitted direct readings of corrosion potentials, solution redox potential (E{sub h}), brine flow rate, pH, and temperature. Estimates of general corrosion rates were obtained by the linear polarization resistance technique and from measurements of complete potentiodynamic polarization curves. The latter also afforded predictions of pitting susceptibilities of active-passive type materials. Twenty-two alloys (with various heat treatments) were tested and readily grouped according to general corrosion resistances in acidified hypersaline (approximately 4 M chloride) brine. Especially promising in regard to corrosion resistance-vs-cost is the series of low Cr--Mo steels. Prescaling of materials in unacidified (pH approximately 5.7) brine prior to exposure to acidified (pH 2 to 4.5) brine was found to be beneficial in reducing corrosion rates at 100{sup 0}C.
Date: December 13, 1977
Creator: Harrar, J.E.; McCright, R.D. & Goldberg, A.
Object Type: Report
System: The UNT Digital Library