179 Matching Results

Search Results

Spray nozzle pattern test for the DWPF HEME task technical plan. [Defense Waste Processing Facility (DWPF), High-Efficiency Mist Eliminators (HEME)]

Description: The DWPF melter off-gas systems have two High-Efficiency Mist Eliminators (HEME) upstream of the High-Efficiency Particulates Air filters (HEPA) to remove fine droplets and particulates from the off-gas. The HEMEs consist of three filter candles. Each filter candle consists of a 0.5 inch layer of 30 micron diameter glass fiber on the upstream face followed by a 2.5 inch layer of 8-micron-diameter glass fiber packed at 11 lbs per cubic foot. The coarse 30-micron filter serves as a prefilter and extends the life of the HEME filter. To have an acceptable fitter life and an efficient HEMIE operation, air atomized water is sprayed into the off-gas stream entering the 14EME and onto the HEMEE surface. The water spray keeps the HEME wet which would dissolve the soluble particulates and enhance the HEME efficiency. A properly designed spray nozzle should wet the three candies of the HEME filter completely.
Date: November 15, 1991
Creator: Lee, L.
Partner: UNT Libraries Government Documents Department

Influence of point defects on grain boundary diffusion in oxides

Description: The influence of point defects on grain boundary diffusion of Co ions in NiO was studied using polycrystalline films and bicrystals. Grain boundary diffusion was studied at 750 C at oxygen partial pressure. Two diffusion regions were found. At low oxygen pressures, extrinsic diffusion was observed. Above oxygen pressure of 10{sup {minus}7}, influence of intrinsic point defects was detected. It was determined that grain boundary diffusion was > 3 orders of magnitude faster than volume diffusion. However, it seems that grain boundary diffusion is influenced by the point defects in a similar way as the volume diffusion. 4 figs.
Date: March 15, 1991
Creator: Stubican, V. S.
Partner: UNT Libraries Government Documents Department

Apparatus and method for critical current measurements

Description: An apparatus for the measurement of the critical current of a superconductive sample, e.g., a clad superconductive sample, the apparatus including a conductive coil, a means for maintaining the coil in proximity to a superconductive sample, an electrical connection means for passing a low amplitude alternating current through the coil, a cooling means for maintaining the superconductive sample at a preselected temperature, a means for passing a current through the superconductive sample, and, a means for monitoring reactance of the coil. The alternating current capable of generating a magnetic field sufficient to penetrate, e.g., any cladding, and to induce eddy currents in the superconductive material, passing a steadily increasing current through the superconductive material, the current characterized as having a different frequency than the alternating current, and, monitoring the reactance of the coil with a phase sensitive detector as the current passed through the superconductive material is steadily increased whereby critical current of the superconductive material can be observed as the point whereat a component of impedance deviates.
Date: March 15, 1991
Creator: Martin, J. A. & Dye, R. C.
Partner: UNT Libraries Government Documents Department

PDS SHRINK. PDS SHRINK

Description: This code enables one to display, take line-outs on, and perform various transformations on an image created by an array of integer*2 data. Uncompressed eight-bit TIFF files created on either the Macintosh or the IBM PC may also be read in and converted to a 16 bit signed integer image. This code is designed to handle all the formats used for PDS (photo-densitometer) files at the Lawrence Livermore National Laboratory. These formats are all explained by the application code. The image may be zoomed infinitely and the gray scale mapping can be easily changed. Line-outs may be horizontal or vertical with arbitrary width, angled with arbitrary end points, or taken along any path. This code is usually used to examine spectrograph data. Spectral lines may be identified and a polynomial fit from position to wavelength may be found. The image array can be remapped so that the pixels all have the same change of lambda width. It is not necessary to do this, however. Lineouts may be printed, saved as Cricket tab-delimited files, or saved as PICT2 files. The plots may be linear, semilog, or logarithmic with nice values and proper scientific notation. Typically, spectral lines are curved.
Date: December 15, 1991
Creator: Phillion, D.
Partner: UNT Libraries Government Documents Department

Light yield from a scintillator tile with embedded readout fibers

Description: We have studied the light yield in two straight fibers embedded in a square scintillator tile by means of computer simulation. The tile and fiber dimensions are taken in the ballpark of interest for the SDC main calorimeter. A fairly flat total response across the tile can be obtained. Important parameters to be controlled are identified.
Date: July 15, 1991
Creator: Trost, H. J.; Tonnison, J. I. & Barnes, V. E.
Partner: UNT Libraries Government Documents Department

Influence of point defects on grain boundary diffusion in oxides. [Annual report, July 1, 1990--March 1, 1992]

Description: The influence of point defects on grain boundary diffusion of Co ions in NiO was studied using polycrystalline films and bicrystals. Grain boundary diffusion was studied at 750 C at oxygen partial pressure. Two diffusion regions were found. At low oxygen pressures, extrinsic diffusion was observed. Above oxygen pressure of 10{sup {minus}7}, influence of intrinsic point defects was detected. It was determined that grain boundary diffusion was > 3 orders of magnitude faster than volume diffusion. However, it seems that grain boundary diffusion is influenced by the point defects in a similar way as the volume diffusion. 4 figs.
Date: March 15, 1991
Creator: Stubican, V. S.
Partner: UNT Libraries Government Documents Department

Biological (molecular and cellular) markers of toxicity. Final report, September 15, 1988--September 14, 1991

Description: Several molecular and cellular markers of genotoxicity were adapted for measurement in the Medaka (Oryzias latipes), and were used to describe the effects of treatment of the organism with diethylnitrosamine (DEN). NO{sup 6}-ethyl guanine adducts were detected, and a slight statistically significant, increase in DNA strand breaks was observed. These results are consistent with the hypothesis that prolonged exposure to high levels of DEN induced alkyltransferase activity which enzymatically removes any O{sup 6}-ethyl guanine adducts but does not result in strand breaks or hypomethylation of the DNA such as might be expected from excision repair of chemically modified DNA. Following a five week continuous DEN exposure with 100 percent renewal of DEN-water every third day, the F values (DNA double strandedness) increased considerably and to similar extent in fish exposed to 25, 50, and 100 ppM DEN. This has been observed also in medaka exposed to BaP.
Date: December 15, 1991
Creator: Shugart, L. R.; D`Surney, S. J.; Gettys-Hull, C. & Greeley, M. S. Jr.
Partner: UNT Libraries Government Documents Department

Demonstration of innovative applications of technology for cost reductions to the CT-121 FGD process. Quarterly report No. 3, October--December 1990

Description: The objective of this project is to demonstrate on a commercial scale several innovative applications of cost-reducing technology to the Chiyoda Thoroughbred-121 (CT-121) process. CT-121 is a second generation flue gas desulfurization (FGD) process which is considered by the Electric Power Research Institute (EPRI) and Southern Company Services (SCS) to be one of the most reliable and lowest cost FGD options for high-sulfur coal-fired utility boiler applications. Demonstrations of the innovative design approaches will further reduce the cost and provide a clear advantage to CT121 relative to competing technology.
Date: February 15, 1991
Partner: UNT Libraries Government Documents Department

Demonstration of innovative applicatiions of technology for cost reductions to the CT-121 FGD process. Quarterly report No. 4, January--March 1991

Description: The objective of this project is to demonstrate on a commercial scale several innovative applications of cost-reducing technology to the Chiyoda Thoroughbred-121 (CT-121) process. CT-121 is a second generation flue gas desulfurization (FGD) process which is considered by the Electric Power Research Institute (EPRI) and Southern Company Services (SCS) to be one of the most reliable and lowest cost FGD options for high-sulfur coal-fired utility boiler applications. Demonstrations of the innovative design approaches will further reduce the cost and provide a clear advantage to CT121 relative to competing technology.
Date: May 15, 1991
Partner: UNT Libraries Government Documents Department

Using a straightness reference in obtaining more accurate surface profiles from a Long Trace Profiler

Description: The Long Trace Profiler has found significant applications in measuring the surfaces of synchrotron optics. However, requirements of small slope errors at all spatial wavelengths of the synchrotron optics mandate more accurate slope measurements. A straightness reference for the Long Trace Profiler greatly increases the accuracy of the instrument. Methods of using the straightness reference by interpreting the sequential interference patterns are discussed and results of measurements are presented.
Date: July 15, 1991
Creator: Irick, S. C.; McKinney, W. R.; Lunt, D. L. J. & Takacs, P. Z.
Partner: UNT Libraries Government Documents Department

Spray nozzle pattern test for the DWPF HEME task technical plan

Description: The DWPF melter off-gas systems have two High-Efficiency Mist Eliminators (HEME) upstream of the High-Efficiency Particulates Air filters (HEPA) to remove fine droplets and particulates from the off-gas. The HEMEs consist of three filter candles. Each filter candle consists of a 0.5 inch layer of 30 micron diameter glass fiber on the upstream face followed by a 2.5 inch layer of 8-micron-diameter glass fiber packed at 11 lbs per cubic foot. The coarse 30-micron filter serves as a prefilter and extends the life of the HEME filter. To have an acceptable fitter life and an efficient HEMIE operation, air atomized water is sprayed into the off-gas stream entering the 14EME and onto the HEMEE surface. The water spray keeps the HEME wet which would dissolve the soluble particulates and enhance the HEME efficiency. A properly designed spray nozzle should wet the three candies of the HEME filter completely.
Date: November 15, 1991
Creator: Lee, L.
Partner: UNT Libraries Government Documents Department

NQR-NMR studies of higher alcohol synthesis Cu-Co catalysts. Quarterly technical progress report, March 15--June 15, 1991

Description: The primary objective of the project is to examine the relations between the catalytic and magnetic properties of the copper-cobalt higher alcohol synthesis catalysts. We have undertaken to investigate the magnetic character by studying the Nuclear Quadrupole resonance of copper and (Zerofield) Nuclear Magnetic Resonance of cobalt in copper cobalt catalysts.
Date: July 15, 1991
Partner: UNT Libraries Government Documents Department

First-principles studies of phase stability and the structural and dynamical properties of metal hydrides. Annual technical progress report, September 15, 1990--May 15, 1991

Description: We decided to investigate first the interaction of hydrogen with the 4d transition-metal series, with the first element being hcp Y. Because of the recent development of soft pseudopotentials, we chose to use the plane wave basis set to carry out the calculation. Since problems had been associated with the slow convergence in transition metals, we first tested the computational methods by studying the structural properties of Y; results were encouraging. We started the calculation of YH{sub x} with hydrogen occupying different interstitial sites.
Date: May 15, 1991
Creator: Chou, M. Y.
Partner: UNT Libraries Government Documents Department

Formal methods in the development of safety critical software systems

Description: As the use of computers in critical control systems such as aircraft controls, medical instruments, defense systems, missile controls, and nuclear power plants has increased, concern for the safety of those systems has also grown. Much of this concern has focused on the software component of those computer-based systems. This is primarily due to historical experience with software systems that often exhibit larger numbers of errors than their hardware counterparts and the fact that the consequences of a software error may endanger human life, property, or the environment. A number of different techniques have been used to address the issue of software safety. Some are standard software engineering techniques aimed at reducing the number of faults in a software protect, such as reviews and walkthroughs. Others, including fault tree analysis, are based on identifying and reducing hazards. This report examines the role of one such technique, formal methods, in the development of software for safety critical systems. The use of formal methods to increase the safety of software systems is based on their role in reducing the possibility of software errors that could lead to hazards. The use of formal methods in the development of software systems is controversial. Proponents claim that the use of formal methods can eliminate errors from the software development process, and produce programs that are probably correct. Opponents claim that they are difficult to learn and that their use increases development costs unacceptably. This report discusses the potential of formal methods for reducing failures in safety critical software systems.
Date: November 15, 1991
Creator: Williams, L. G.
Partner: UNT Libraries Government Documents Department

High resolution, shallow seismic reflection survey of the Pen Branch fault

Description: The purpose of this project, at the Savannah River River Site (SRS) was to acquire, process, and interpret 28 km (17.4 miles) of high resolution seismic reflection data taken across the trace of the Pen Branch fault and other suspected, intersecting north-south trending faults. The survey was optimized for the upper 300 ft of geologic strata in order to demonstrate the existence of very shallow, flat lying horizons, and to determine the depth of the fault or to sediments deformed by the fault. Field acquisition and processing parameters were selected to define small scale spatial variability and structural features in the vicinity of the Pen Branch fault leading to the definition and the location of the Pen Branch fault, the shallowest extent of the fault, and the quantification of the sense and magnitude of motion. Associated geophysical, borehole, and geologic data were incorporated into the investigation to assist in the determination of optimal parameters and aid in the interpretation.
Date: May 15, 1991
Creator: Stieve, A.
Partner: UNT Libraries Government Documents Department

Quaternary investigation

Description: The primary purpose of the Quaternary investigation is to provide information on the location and age of Quaternary deposits for use in evaluating the presence or absence of neotectonic deformation or paleoliquefaction features within the Savannah River Site (SRS) region. The investigation will provide a basis for evaluating the potential for capable faults and associated deformation in the SRS vicinity. Particular attention will be paid to the Pen Branch fault.
Date: May 15, 1991
Creator: Stieve, A.
Partner: UNT Libraries Government Documents Department

Safety questions relevant to nuclear thermal propulsion

Description: Nuclear propulsion is necessary for successful Mars exploration to enhance crew safety and reduce mission costs. Safety concerns are considered by some to be an implements to the use of nuclear thermal rockets for these missions. Therefore, an assessment was made of the various types of possible accident conditions that might occur and whether design or operational solutions exist. With the previous work on the NERVA nuclear rocket, most of the issues have been addressed in some detail. Thus, a large data base exist to use in an agreement. The assessment includes evaluating both ground, launch, space operations and disposal conditions. The conclusion is that design and operational solutions do exist for the safe use of nuclear thermal rockets and that both the environment and crews be protected against harmful radiation. Further, it is concluded that the use of nuclear thermal propulsion will reduce the radiation and mission risks to the Mars crews.
Date: October 15, 1991
Creator: Buden, D.
Partner: UNT Libraries Government Documents Department

Mathematical model of the Savannah River Site waste tank farm

Description: A mathematical model has been developed to simulate operation of the waste tank farm and the associated evaporator systems at the Savannah River Site. The model solves material balance equations to predict the volumes of liquid waste, salt, and sludge for all of the tanks within each of the evaporator systems. Additional logic is included to model the behavior of waste tanks not directly associated with the evaporators. Input parameters include the Material Management Plan forecast of canyon operations, specification of other waste sources for the evaporator systems, evaporator operating characteristics, and salt and sludge removal schedules. The model determines how the evaporators will operate, when waste transfers can be made, and waste accumulation rates. Output from the model includes waste tank contents, summaries of systems operations, and reports of space gain and the remaining capacity to store waste materials within the tank farm. Model simulations can be made to predict waste tank capacities on a daily basis for up to 20 years. The model is coded as a set of three computer programs designed to run on either IBM compatible or Apple Macintosh II personal computers.
Date: July 15, 1991
Creator: Smith, F. G. III
Partner: UNT Libraries Government Documents Department

The limnology of L Lake: Results of the L-Lake monitoring program, 1986--1989

Description: L Lake was constructed in 1985 on the upper regions of Steel Creek, SRS to mitigate the heated effluents from L Reactor. In addition to the NPDES permit specifications (Outfall L-007) for the L-Reactor outfall, DOE-SR executed an agreement with the South Carolina Department of Health and Environmental Control (SCDHEC), that thermal effluents from L-Reactor will not substantially alter ecosystem components in the approximate lower half of L Lake. This region should be inhabited by Balanced (Indigenous) Biological Communities (BBCs) in accordance with Section 316(a) of the Pollution Control (Clean Water) Act (Public Law 92-500). In response to this requirement the Environmental Sciences Section/Ecology Group initiated a comprehensive biomonitoring program which documented the development of BBCs in L Lake from January 1986 through December 1989. This report summarizes the principal results of the program with regards to BBC compliance issues and community succession in L Lake. The results are divided into six sections: water quality, macronutrients, and phytoplankton, aquatic macrophytes, zooplankton, benthic macroinvertebrates, fish, and community succession. One of the prime goals of the program was to detect potential reactor impacts on L Lake.
Date: December 15, 1991
Creator: Bowers, J. A.
Partner: UNT Libraries Government Documents Department

Single-electron charging effects. Technical progress report

Description: The status of our project on single-electron tunneling is, again, excellent. As outlined in our original proposal, a key goal for this project has been the development of a scanning tunneling instrument for the purpose of imaging individual particles and tunneling into these particles at high magnetic fields. Further progress is discussed in this report.
Date: December 15, 1991
Creator: Ruggiero, S. T.
Partner: UNT Libraries Government Documents Department

Innovative Clean Coal Technology (ICCT): Demonstration of innovative applications of technology for cost reductions to the CT-121 FGD process. Quarterly report No. 6, July--September 1991

Description: The project`s objective is to demonstrate innovative applications of technology for cost reduction for the Chiyoda Thoroughbred-121 (CT-121) process. The CT-121 process is a wet FGD process that removes SO{sub 2}, can achieve simultaneous particulate control, and can produce a salable by-product gypsum thereby reducing or even eliminating solid waste disposal problems. Figure 1 shows a flow schematic of the process. CT-121 removes SO{sub 2} and particulate matter in a unique limestone-based scrubber called the Jet Bubbling Reactor (JBR). IN the JBR, flue gas bubbles beneath the slurry, SO{sub 2} is absorbed, and particulate matter is removed from the gas. The agitator circulates limestone slurry to ensure that fresh reactant is always available in the bubbling or froth zone sot that SO{sub 2} removal can proceed at a rapid rate. Air is introduced into the bottom of the JBR to oxidize the absorbed SO{sub 2} to sulfate, and limestone is added continuously to neutralize the acid slurry and form gypsum. The JBR is designed to allow ample time for complete oxidation of the SO{sub 2}, for complete reaction of the limestone, and for growth of large gypsum crystals. The gypsum slurry is continuously withdrawn from the JBR and is to be dewatered in a gypsum stack. The stacking technique involves filing a diked area with gypsum slurry, allowing the gypsum solids to settle, and removing clear liquid from the top of the stack for recycle back to the process.
Date: November 15, 1991
Partner: UNT Libraries Government Documents Department

Hydrocarbons associated with brines from geopressured wells. First quarterly technicl progress report, 1 January 1991--30 March 1991

Description: The purpose of this research is to determine the concentration of the cryocondensates in fluids of the various USDOE Geopressured wells as a function of production volume. The wells are visited each month that they are operating and samples are to be taken cryogenically during each visit. A gas scrubbing system will continuously samples the gas streams of the wells in the intervals between visit. Collectors, exchanged daily by site personnel, are retrieved on each visit. Results for the reporting period are presented.
Date: January 15, 1991
Partner: UNT Libraries Government Documents Department

Hydrocarbons associated with brines from geopressured wells. Third quarterly technical progress report, 1 July 1991--30 September 1991

Description: Efforts to determine the concentration of the cryocondensates in fluids of the various USDOE Geopressured wells a function of production volume. The wells are visited monthly as they are operating and samples are reported taken cryogenically during each visit. A gas scrubbing system continuously sample the gas streams of the wells in the intergas scrubbing system continuously sample the gas streams of the wells in the intervals between visit. Results obtained are to correlated the production of the collected compounds with reservoir and well production characteristics.
Date: October 15, 1991
Partner: UNT Libraries Government Documents Department