114 Matching Results

Search Results

A Continuous Automated Vault Inventory System (CAVIS) for accountability monitoring of stored nuclear materials

Description: Nearly all facilities that store hazardous (radioactive or non-radioactive) materials must comply with prevailing federal, state, and local laws. These laws usually have components that require periodic physical inspections to insure that all materials remain safely and securely stored. The inspections are generally labor intensive, slow, put personnel at risk, and only find anomalies after they have occurred. The system described in this paper was developed for monitoring stored nuclear materials resulting from weapons dismantlement, but its applications extend to any storage facility that meets the above criteria. The traditional special nuclear material (SNM) accountability programs, that are currently used within most of the Department of Energy (DOE) complex, require the physical entry of highly trained personnel into SNM storage vaults. This imposes the need for additional security measures, which typically mandate that extra security personnel be present while SNM inventories are performed. These requirements increase labor costs and put additional personnel at risk to radiation exposure. In some cases, individuals have received radiation exposure equivalent to the annual maximum during just one inventory verification. With increasing overhead costs, the current system is rapidly becoming too expensive to operate, the need for an automated method of inventory verification is evident. The Continuous Automated Vault Inventory System (CAVIS) described in this paper was designed and prototyped as a low cost, highly reliable, and user friendly system that is capable of providing, real-time weight, gamma. and neutron energy confirmation from each item stored in a SNM vault. This paper describes the sensor technologies, the CAVIS prototype system (built at Y- 12 for highly enriched uranium storage), the technical requirements that must be achieved to assure successful implementation, and descriptions of sensor technologies needed for a plutonium facility.
Date: December 8, 1994
Creator: Pickett, C. A.; Barham, M. A.; Gafford, T. A.; Hutchinson, D. P.; Jordan, J. K.; Maxey, L. C. et al.
Partner: UNT Libraries Government Documents Department

Molten salt destruction of energetic material wastes as an alternative to open burning

Description: The Lawrence Livermore National Laboratory in conjunction with the Energetic Materials Center (a partnership of Lawrence Livermore and Sandia National Laboratories), is developing methods for the safe and environmentally sound destruction of explosives and propellants as a part of the Laboratory`s ancillary demilitarization mission. As a result of the end of the Cold War and the shift in emphasis to a smaller stockpile, many munitions, both conventional and nuclear, are scheduled for retirement and rapid dismantlement and demilitarization. major components of these munitions are the explosives and propellants, or energetic materials. The Department of Energy has thousands of pounds of energetic materials which result from dismantlement operations at the Pantex Plant. The Department of Defense has several hundred million pounds of energetic materials in its demilitarization inventory, with millions more added each year.
Date: September 8, 1994
Creator: Upadhye, R.S.; Brummond, W.A.; Pruneda, C.O. & Watkins, B.E.
Partner: UNT Libraries Government Documents Department

The theory of hadronic systems. Annual progress report

Description: This report briefly discusses progress on the following topics: isospin breaking in the pion-nucleon system; the np charge-exchange reaction; energy dependence of pion DCX; pion absorption in nuclei; quantum effects in inclusive reactions; and pion scattering from polarized nuclei.
Date: April 8, 1994
Creator: Gibbs, W.R.
Partner: UNT Libraries Government Documents Department

A superquadratic infeasible-interior-point method for linear complementarity problems

Description: We consider a modification of a path-following infeasible-interior- point algorithm described by Wright. In the new algorithm, we attempt to improve each new iterate by reusing the coefficient matrix factors from the latest step. We show that the modified algorithm has similar theoretical global convergence properties to the earlier algorithm, while its asymptotic convergence rate can be made superquadratic by an appropriate parameter choice.
Date: February 8, 1994
Creator: Wright, S. & Zhang, Yin
Partner: UNT Libraries Government Documents Department

A performance evaluation of coating systems for long term aqueous immersion service

Description: The static immersion of coated steel panels in various media representative of chemical and waste processes around the Oak Ridge Y-12 Plant was terminated after 16 months exposure for evaluation of coating performance and comparison with observations collected following 1, 6, and 11 months exposure. In each environment, a wide range of coating performance was observed, including some coatings unsuitable for use in the test environment (despite the high recommendation of the vendor). Further, coating performance as a function of time suggests a test duration of at least several months is required to fully assess candidate coating performance for specific applications. The performance of many coatings, particularly in the most alkaline environment, was adversely affected by the imposition of supplemental cathodic protection on the coated test panels.
Date: November 8, 1994
Creator: Pawel, S.J.
Partner: UNT Libraries Government Documents Department

New catalysts for coal processing: Metal carbides and nitrides. Final report, September 11, 1991--September 10, 1994

Description: The main objective of this project was to study transition metal carbides and nitrides as catalysts for hydroprocessing. In particular, the goals were to study the solid-state transformations that occur during synthesis of the compounds using a temperature-programmed method, and to investigate the catalytic properties of the materials for the upgrading of model coal liquids at realistic process conditions.
Date: June 8, 1994
Creator: Oyama, S.T.
Partner: UNT Libraries Government Documents Department

[A variable frequency microwave furnace]. CRADA final report for CRADA Number ORNL91-0055

Description: The goals of this CRADA were to: (1) development and demonstrate a highly frequency-agile microwave furnace; (2) explore applications of the furnace for materials processing; and (3) develop control systems and packaging that are robust, user-friendly, and suitable for sale as a turnkey system. Microwave Laboratories, Inc. (MLI) designed, built, and successfully brought to market a benchtop Variable Frequency Microwave Furnace (VFMF). The concept has demonstrated advantages in polymer curing, waste remediation, and diamond (CVD). Through experimentation and modeling, the VFMF approach has gained credibility within the technical community.
Date: December 8, 1994
Creator: Lauf, R. J.
Partner: UNT Libraries Government Documents Department

Design and fabrication of a prototype sensor system for waste storage tank characterization. CRADA final report for CRADA Number ORNL92-0094

Description: On February 15--16 1994, ORNL and MTI presented a technology demonstration showcasing the results of a CRADA between the two organizations. The CRADA project entailed design and development of a structured light mapping system suitable for deployment in underground waste storage tanks. The CRADA expanded upon a system previously designed and deployed at the DOE Fernald site by ORNL. Enhancements in the new system include: a factor of ten increase in mapping speed; radiation and environmental hardening sufficient for use in the Hanford single-shell tanks (up to 5,000 rad/hr, pH = 12, high heat, etc.); capability to map and display data for both vertical surfaces, such as pipes, and horizontal surfaces; rugged, compact design that can be deployed through a ten centimeter riser; and a design that can be decontaminated easily after deployment.
Date: December 8, 1994
Creator: Burks, B.L. & Wagner, J.
Partner: UNT Libraries Government Documents Department

{mu}{sup +}SR studies of magnetic properties of boron carbide superconductors

Description: Positive-muon spin relaxation ({mu}{sup +}SR) has been carried out in the recently-discovered rare-earth boron carbide superconductors RNi{sub 2}B{sub 2}C, R = Ho, Er and Tm. For R = Ho and Er zero-field {mu}{sup +}SR measurements showed a well-defined internal field below the Neel temperatures of 5.5 K coexisting with the superconducting state down to 0.1 K. The observed temperature dependence of the order parameter for Ho is consistent with a 2-dimensional Ising model. For R = Tm a spontaneous internal field appears above 30 K, whose magnitude saturates below about 3 K at a value corresponding to a rare earth moment much smaller than for Ho and Er. Transverse-field {micro}{sup {minus}}SR measurements in R = Tm showed a superconducting penetration depth {lambda}, = 1,200 {angstrom}. The temperature dependence of {lambda} is consistent with conventional s-wave pairing.
Date: June 8, 1994
Creator: Le , L.P.; Heffner, R.H. & Nieuwenhuys, G.J.
Partner: UNT Libraries Government Documents Department

Recent program evaluations: Implications for long-run planning

Description: Demand-side management (DSM) remains the centerpiece of California`s energy policy. Over the coming decade, California plans to meet 30 percent of the state`s incremental electricity demand and 50 percent of its peak demand with (DSM) programs. The major investor-owned utilities in California recently completed the first round of program impact studies for energy efficiency programs implemented in 1990 and 1991. The central focus of this paper is to assess the resource planning and policy implications of Pacific Gas and Electric (PG&E) Company`s recent program evaluations. The paper has three goals. First, we identify and discuss major issues that surfaced from our attempt to apply evaluation results to forecasting and planning questions. Second, we review and summarize the evaluation results for PG&E`s primary energy efficiency programs. Third, we change long-run program assumptions, based on our assessment in the second task, and then examine the impacts of these changes on a recent PG&E demand-side management forecast and resource plan.
Date: June 8, 1994
Creator: Baxter, L.W. & Schultz, D.K.
Partner: UNT Libraries Government Documents Department

Electron transport phenomena and dense plasmas produced by ultra-short pulse laser interaction

Description: Recent experiments with femtosecond lasers provide a test bed for theoretical ideas about electron processes in hot dense plasmas. We briefly review aspects of electron conduction theory likely to prove relevant to femtosecond laser absorption. We show that the Mott-Ioffe-Regel limit implies a maximum inverse bremsstrahlung absorption of about 50% at temperatures near the Fermi temperature. We also propose that sheath inverse bremsstrahlung leads to a minimum absorption of 7-10% at high laser intensity.
Date: July 8, 1994
Creator: More, R.M.
Partner: UNT Libraries Government Documents Department

The effect of actinide thin films on the electronic structure and reactivity of various elements

Description: This report summarizes the experimental work carried out at the Lawrence Livermore National Laboratory on the electronic structure and reactivity of uranium thin films on Pd, Pt, Si, graphite, Cu, and Au substrates from 1990 to 1993. The U-Pd system was studied in the most detail because it was the first to be chosen right after the completion of the experimental equipment. We first studied and characterized clean U overlayers and the possible surface reactions between this metal and the substrates studied. We then subjected these systems to reactive conditions such as heating and adsorbing corrosive gases (O{sub 2}, CO, CO{sub 2}, and C{sub 2}H{sub 4}). Finally we investigated the diffusion of U metal and some of its compounds into the substrates. A new technique was developed, based on Auger Electron Spectroscopy, to follow in real time the diffusion of U overlayers into the substrate. The temperature of the sample is ramped linearly up to 900{degrees}C while following the Auger peak intensities of the two components for a given system. Diffusion rates are obtained by differentiating the measured intensity curves, then peaks result corresponding to diffusion processes with different activation energies. This technique bears a strong similarity to thermal desorption spectroscopy (TDS), where the sample is heated linearly and the rate of desorption is measured as a function of temperature and heating rate.
Date: December 8, 1994
Creator: Gouder, T. & Colmenares, C.
Partner: UNT Libraries Government Documents Department

Hohlraum drive and implosion experiments on Nova. Revision 1

Description: Experiments on Nova have demonstrated hohlraum radiation temperatures up to 300 eV and in lower temperature experiments reproducible time integrated symmetry to 1--2%. Detailed 2-D LASNEX simulations satisfactorily reproduce Nova`s drive and symmetry scaling data bases. Hohlraums has been used for implosion experiments achieving convergence ratios (initial capsule radius/final fuel radius) up to 24 with high density glass surrounding a hot gas fill.
Date: September 8, 1994
Creator: Kilkenny, J.D.; Suter, L.J. & Cable, M.D.
Partner: UNT Libraries Government Documents Department

Amplification of femtosecond pulses to 1 J in Cr:LiSrAlF{sub 6}

Description: Using a large aperture (19 mm) flashlamp-pumped Cr:LiSrAlF{sub 6}(LiSAF) amplifier, we have demonstrated the amplification of hundred femtosecond pulses to an energy of 1.0 J. Chirped pulse amplification in LiSAF results in recompressed pulses of 125 fsec at a repetition rate of one shot every 20 seconds.
Date: November 8, 1994
Creator: Ditmire, T. & Perry, M.D.
Partner: UNT Libraries Government Documents Department

[News Clip: Shooting]

Description: Video footage from the KXAS-TV television station in Fort Worth, Texas, covering a news story.
Date: May 8, 1994
Creator: KXAS-TV (Television station : Fort Worth, Tex.)
Partner: UNT Libraries Special Collections

[News Clip: Abortion ad]

Description: Video footage from the KXAS-TV television station in Fort Worth, Texas, covering a news story.
Date: February 8, 1994, 10:00 p.m.
Creator: KXAS-TV (Television station : Fort Worth, Tex.)
Partner: UNT Libraries Special Collections

[News Clip: Ballparking]

Description: Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story. This story aired at 5pm.
Date: April 8, 1994, 5:00 p.m.
Creator: KXAS-TV (Television station : Fort Worth, Tex.)
Partner: UNT Libraries Special Collections

[Letter from Julie Abel to Harriet Laney, September 8, 1994]

Description: Photocopy of a letter from Julie Abel, Program Associate, Getty Center for Education in the Arts, to Harriet Laney, NTIEVA, in regards to the Getty Center for Education in the Arts has received and approved the North Texas Institute for Educators on the Visual Arts financial report of grant funds. Cc'd on the letter are, Jack Davis, Bill McCarter (crossed out), Natalie Sterba and Vicki Rosenberg.
Date: September 8, 1994
Creator: Abel, Julie
Partner: UNT Libraries Special Collections