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Safety rod latch inspection
During an attempt to raise control rods from the 100 K reactor in December, one rod could not be withdrawn. Subsequent investigation revealed that a small button'' in the latch mechanism had broken off of the lock plunger'' and was wedged in a position that prevented rod withdrawal. Concern that this failure may have resulted from corrosion or some other metallurgical problem resulted in a request that SRL examine six typical latch mechanisms from the 100 L reactor by use of radiography and metallography. During the examination of the L-Area latches, a failed latch mechanism from the 100 K reactor was added to the investigation. Fourteen latches that had a history of problems were removed from K-Area and sent to SRL for inclusion in this study the week after the original seven assemblies were examined, bringing the total of latch assemblies discussed in this report to twenty one. Results of the examination of the K-Area latch that initiated this study is not included in this report.
Date:
February 1, 1992
Creator:
Leader, D.R.
Object Type:
Report
System:
The UNT Digital Library
Ceramic microstructures and their elucidation by imaging, diffraction and spectroscopic methods
The development and potential utilization of ceramic materials is dependent on a systematic effort involving processing, characterization and appropriate property measurements. The methods of characterization are numerous and it is important to employ the one that is appropriate to the problem both in terms of its information content and the achievable level of resolution. With the incorporation of fine probe forming capabilities in a transmission electron microscope and the development of related diffraction, imaging and spectroscopic methods, it is now possible to obtain structural and chemical information from the same region of the sample at high spatial resolution. In this review, recent advances along with representative examples in the application of high resolution electron microscopy (HREM), convergent beam electron diffraction (CBED), low atomic number element microanalysis by x-ray emission spectroscopy (XES), fine structures in electron energy-loss spectroscopy (EELS) and specific site occupancy determination by channeling experiments are discussed.
Date:
February 1, 1992
Creator:
Kirshnan, K.M.
Object Type:
Article
System:
The UNT Digital Library
Integrated dry NO sub x /SO sub 2 emissions control system
The DOE Cooperative Agreement No. DE-FC22-91PC90550 dated March 11, 1991, Public Service Company of Colorado has prepared the following quarterly report for Phases I, IIA, and IIB of the Integrated Dry NO{sub x}SO{sub 2} Emissions Control System Project. This project includes low NO{sub x} burners with NO{sub x} ports (post firing air injection), humidification and dry sorbent injection.
Date:
February 15, 1992
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
NQR-NMR studies of higher alcohol synthesis Cu-Co catalysts
Methods of preparation of the copper, cobalt, and titanium catalysts were outlined. The catalyst samples were then analyzed through nuclear magnetic and nuclear quadrupole resonance.
Date:
February 1, 1990
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
A study of steady-state steam-water counterflow in porous media
Vapor-liquid counterflow in porous media arises in processes such as heat pipes, oil recovery and geothermal systems. Previous studies analysed these phenomena in separate contexts. This paper presents a unified description from which previous models result as limiting cases. The analysis includes capillarity, heat conduction, and Kelvin effects. The importance of each term to various processes is examined. Significantly, it is found that the critical heat flux is not constant but increases with decreasing permeability. A threshold permeability is identified below which steady states may not exist. Analogous conclusions are reached regarding liquid-dominated geothermal systems. 24 refs., 15 figs.
Date:
February 1, 1990
Creator:
Satik, C.; Parlar, M. & Yortsos, Y.C.
Object Type:
Report
System:
The UNT Digital Library
Dynamics of H sub 2 elimination from unsaturated hydrocarbons
State-of-the-art laser and molecular beam techniques are used to study the dynamics of H{sub 2} elimination from 1,4-cyclohexadiene and ethylene. Information on the transition state configurations and the dynamics of the dissociation processes for these reactions is reported. 152 refs., 54 figs., 12 tabs.
Date:
February 1, 1991
Creator:
Cromwell, E.F.
Object Type:
Report
System:
The UNT Digital Library
An overview of the ALS
This report giving a overview of the parameters, specifications, and scientific programs of the Advance Light Source. (LSP)
Date:
February 1, 1991
Creator:
Schlachter, A.S. & Robinson, A.
Object Type:
Report
System:
The UNT Digital Library
On-line chemical composition analyzer development
The energy consumed in distillation processes in the United States represents nearly three percent of the total national energy consumption. If effective control of distillation columns can be accomplished, it has been estimated that it would result in a reduction in the national energy consumption of 0.3%. Real-time control based on mixture composition could achieve these savings. However, the major distillation processes represent diverse applications and at present there does not exist a proven on-line chemical composition sensor technology which can be used to control these diverse processes in real-time. This report presents a summary of the findings of the second phase of a three phase effort undertaken to develop an on-line real-time measurement and control system utilizing Raman spectroscopy. A prototype instrument system has been constructed utilizing a Perkin Elmer 1700 Spectrometer, a diode pumped YAG laser, two three axis positioning systems, a process sample cell land a personal computer. This system has been successfully tested using industrially supplied process samples to establish its performance. Also, continued application development was undertaken during this Phase of the program using both the spontaneous Raman and Surface-enhanced Raman modes of operation. The study was performed for the US Department of Energy, Office …
Date:
February 1, 1992
Creator:
Roberts, M.J.; Garrison, A.A.; Muly, E.C. & Moore, C.F.
Object Type:
Report
System:
The UNT Digital Library
Validated heat-transfer and pressure-drop prediction methods based on the discrete element method: Phase 1, Three-dimensiional roughness
A computer program based on the discrete element method has been developed and validated to compute friction factors and Nusselt numbers for fully developed turbulent flow and heat transfer in pipes with three-dimensional roughness elements. Computational results are compared with appropriate cases from heat transfer experiments in the literature. The predictions were in general in very good agreement with the experimental data.
Date:
February 1, 1992
Creator:
Taylor, R.P. & Hodge, B.K. (Mississippi State Univ., MS (United States). Dept. of Mechanical and Nuclear Engineering)
Object Type:
Report
System:
The UNT Digital Library
Measured energy savings and economics of retrofitting existing single- family homes: An update of the BECA-B database
These appendices are the companion volume to report number LBL--28147 Vol.1, with the same title. The summary data tables include physical characteristics, energy consumption, savings, and the retrofit measures installed and their costs for each retrofit project. Each existing single family residential building'' retrofit project in the BECA-B database is described. 99 refs. (BM)
Date:
February 1, 1991
Creator:
Cohen, S.D.; Goldman, C.A. & Harris, J.P.
Object Type:
Report
System:
The UNT Digital Library
An Analytic Determination of Beta Poloidal and Internal Inductance in an Elongated Tokamak From Magnetic Probe Measurements
Analytic calculations of the magnetic fields available to magnetic diagnostics are performed for tokamaks with circular and elliptical cross sections. The explicit dependence of the magnetic fields on the poloidal beta and internal inductances is sought. For tokamaks with circular cross sections, Shafranov's results are reproduced and extended. To first order in the inverse aspect ratio expansion of the magnetic fields, only a specific combination of beta poloidal and internal inductance is found to be measurable. To second order in the expansion, the measurements of beta poloidal and the internal inductance are demonstrated to be separable but excessively sensitive to experimental error. For tokamaks with elliptical cross sections, magnetic measurements are found to determine beta poloidal and the internal inductance separately. A second harmonic component of the zeroth order field in combination with the dc harmonic of the zeroth order field specifies the internal inductance. The internal inductance in hand, measurement of the first order, first harmonic component of the magnetic field then determined beta poloidal. The degeneracy implicit in Shafranov's result (i.e. that only a combination of beta poloidal and internal inductance is measurable for a circular plasma cross section) reasserts itself as the elliptic results are collapsed to …
Date:
February 1, 1992
Creator:
Sorci, J. M.
Object Type:
Report
System:
The UNT Digital Library
The IGAC activity for the development of global emissions inventories: Description and initial results
Modeling assessments of the atmospheric chemistry, air quality and climatic conditions of the past, present and future require as input inventories of emissions of the appropriate chemical species constructed on appropriate spatial and temporal scales. The task of the Global Emissions Inventories Activity (GEIA) of the International Global Atmospheric Chemistry Project (IGAC) is the production of global inventories suitable for a range of research applications. Current GEIA programs are generally based on addressing emissions by species; these include CO{sub 2}, NH{sub 3}/N{sub 2}O, SO{sub 2}/NO{sub x}, CFC, volatile organic compounds and radioisotopes. In addition a separate program to inventory emissions from biomass burning is also being structured, plus an additional program to address data management issues for all the developing inventories. Program priorities are based on current knowledge and tasks needed to produce the desired inventories. This paper will discuss the different types of global inventories to be developed by the GEIA programs, their key characteristics, and areas to be addressed in the compilation of such inventories. Results of the first GEIA task, a survey of existing inventories and auxiliary data, will be presented. The survey included status assessments for the available inventory information for nineteen different atmospheric species or …
Date:
February 1, 1992
Creator:
Benkovitz, C.M. (Brookhaven National Lab., Upton, NY (United States)) & Graedel, T.E. (AT and T Bell Labs., Murray Hill, NJ (United States))
Object Type:
Article
System:
The UNT Digital Library
NUCLA Circulating Atmospheric Fluidized Bed Demonstration Project
The objective of this DOE Cooperative Agreement is to conduct a cost-shared clean coal technology project to demonstrate the feasibility of circulating fluidized bed combustion technology and to evaluate economic, environmental, and operational benefits of CFB steam generators on a utility scale. At the conclusion of the Phase 2 program, testing related to satisfying these objectives was completed. Data analysis and reporting are scheduled for completion by October 1991. (VC)
Date:
February 1, 1992
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Condensing economizers: Thermal performance and particulate removal efficiencies
Condensing economizers can be used to increase the thermal efficiency of boilers and furnaces. This project has involved a study of these specifically for application to coal-water mixture fuels although the results can be extended to other fuels. experimental studies to evaluate thermal performance and removal of particulates across indirect contract economizers have been performed. The test arrangement incorporates oil firing with the injection of flyash into the flue gas to simulate coal combustion products. Water sprays into the combustion products are used to achieve variable flue gas moisture content and a variable amount of condensation in the economizers. The economizers are tubular with flue gas on the outside of the tubes. Tube surfaces are plastic coated to prevent corrosion. The gas temperature and condensation profiles through the economizers have been predicted and overall predicted performance has been compared with test results. Mechanisms for particle removal are discussed and predicted removal efficiencies as a functions of particle diameter are presented. It is is shown that inertial impaction is the dominant mechanism and particle removal efficiencies up to 89% have been realized.
Date:
February 1, 1992
Creator:
Butcher, T.A.; Litzke, Wai Lin (Brookhaven National Lab., Upton, NY (United States)) & Park, N. (Stony Brook Scientific, Ltd., Morristown, PA (United States))
Object Type:
Article
System:
The UNT Digital Library
Control of alpha particle transport by spatially inhomogeneous ion cyclotron resonance heating
Control of the radial alpha particle transport by using Ion Cyclotron Range of Frequency waves is investigated in a large-aspect-ratio tokamak geometry. It is shown that spatially inhomogeneous ICRF-wave energy with properly selected frequencies and wave numbers can induce fast convective transport of alpha particles at the speed of order {upsilon}{sub alpha} {approximately} (P{sub RF}/n{sub {alpha}}{epsilon}{sub 0}) {rho}{sub p}, where P{sub RF} is the ICRF-wave power density, n{sub {alpha}} is the alpha density, {epsilon}{sub 0} is the alpha birth energy, and {rho}{sub p} is the poloidal gyroradius of alpha particles at the birth energy. Application to ITER plasmas is studied and possible antenna designs to control alpha particle flux are discussed. 8 refs., 3 figs.
Date:
February 1, 1990
Creator:
Chang, C. S.; Imre, K.; Weitzner, H. (New York Univ., NY (USA). Courant Inst. of Mathematical Sciences) & Colestock, P. (Princeton Univ., NJ (USA). Plasma Physics Lab.)
Object Type:
Report
System:
The UNT Digital Library
Integrated dry NO sub x /SO sub 2 emissions control system
The DOE Cooperative Agreement No. DE-FC22-91PC90550 dated march 11, 1991, Public Service Company of Colorado has prepared the following quarterly report for Phases I, IIA, and IIB of the Integrated Dry No{sub x}/SO{sub 2} Emissions Control System Project. This project includes low NO{sub x} burners with NO{sub x} ports (post firing air injection), humidification and dry sorbent injection.
Date:
February 15, 1992
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Application of automated deduction to the search for single axioms for exponent groups
We present new results in axiomatic group theory obtained by using automated deduction programs. The results include single axioms, some with the identity and others without, for groups of exponents 3, 4, 5 and 7, and a general form for single axioms for groups of odd exponent. The results were obtained by using the programs in three separate ways: as a symbolic calculator, to search for proofs,and to search for couterexamples. We also touch on relations between logic programming and automated reasoning.
Date:
February 11, 1992
Creator:
McCune, W. & Wos, L.
Object Type:
Article
System:
The UNT Digital Library
Experimental and theoretical investigation of high gradient acceleration
This report contains a technical progress summary of the research conducted under the auspices of DOE Grant No. DE-FG0291ER-40648. Experimental and Theoretical Investigations of High Gradient Acceleration.'' This grant supports three research tasks: Task A consists of the design and fabrication of a 17GHz of photocathode gun, Task B supports the testing of high gradient acceleration using a 33GHz structure, and Task C comprises theoretical investigations, both in support of the experimental tasks and on critical physics issues for the development of high energy linear colliders. This report is organized as follows. The development of an rf gun design and research progress on the picosecond laser system is summarized in Sec. 2, the status of the studies of the LBL/Haimson high gradient structure, using a 50 MW free-electron laser is summarized in Sec. 3, and theoretical research progress is described in Sec. 4. Supporting material is contained in Appendices A-G.
Date:
February 1, 1992
Creator:
Bekefi, G.; Chen, C.; Chen, S.; Danly, B.; Temkin, R.J. & Wurtele, J.S.
Object Type:
Report
System:
The UNT Digital Library
Environmental monitoring for the DOE coolside and LIMB demonstration extension projects
The purpose of this document is to present environmental monitoring data collected during the US DOE Limestone Injection Multistage Burner (LIMB) Demonstration Project Extension. The objective of the LIMB program is to demonstrate the sulfur dioxide (SO{sub 2}) and nitrogen oxide (NO{sub x}) emission reduction capabilities of the LIMB system. The LIMB system is a retrofit technology to be used for existing coal-fired boilers equipped with electrostatic precipitators. (VC)
Date:
February 1, 1992
Creator:
White, T.; Contos, L. & Adams, L. (Radian Corp., Research Triangle Park, NC (United States). Progress Center)
Object Type:
Report
System:
The UNT Digital Library
Operation and radiation resistance of a FOXFET biasing structure for silicon strip detectors
AC-coupled strip detectors biased with a FOXFET transistor structure have been studied. Measurement results for the basic operational characteristics of the FOXFET are presented together with a brief description of the physics underlying its operation. Radiation effects were studied using photons from a {sup 137}Cs source. Changes in the FOXFET characteristics as a function of radiation dose up to 1 MRad are reported. Results about the effect of radiation on the noise from a FOXFET biased detector are described. 13 refs.
Date:
February 1, 1992
Creator:
Laakso, M. (Fermi National Accelerator Lab., Batavia, IL (United States) Helsinki Univ. (Finland). Dept. of High Energy Physics); Singh, P.; Engels, E. Jr. & Shepard, P. (Pittsburgh Univ., PA (United States). Dept. of Physics and Astronomy)
Object Type:
Article
System:
The UNT Digital Library
Savannah River Laboratory monthly report, February 1992
This report is a progress report for the Savannah River Laboratory for the month of February 1992. The progress and activities in six categories were described in the report. The categories are reactor, tritium, separations, environmental, waste management, and general. Each category described numerous and varied activities. Some examples of these activities described are such things as radiation monitoring, maintenance, modifications, and remedial action.
Date:
February 1, 1992
Creator:
Ferrell, J.M. (comp.) & Ice, L.W. (ed.)
Object Type:
Report
System:
The UNT Digital Library
MHD Integrated Topping Cycle Project
A summary of the work is excerpted here. Final design of an MHD channel for the ITC program POC test has been completed. The channel was designed to be capable of 1.5 MW {sub e} power output and a lifetime of 2000 hours. Emphasis was placed upon durability and reliability. Hence, specific measures were taken to design against channel damage due to electric faults. The life-limiting issues associated with electrochemical corrosion and erosion of gas-side surfaces were addressed by the use of various materials with proven wear characteristics in a coal-fired MHD channel environment. Pitting of prototypical sidewall coupons was observed in the CDIF workhorse testing. The most likely cause of the observed pitting, water leaks resulting from cooling water tube braze failures, has been remedied. New brazing procedures and isolation of the sidebar gas-side material from water contact will prevent sidebar pitting in the prototypical channel. Water-side corrosion tests reported in this quarterly report include the latest results of tungsten-copper elements at controlled pH, heat flux and voltage levels. In the combustion subsystem, efforts continued to focus on understanding and improving the current levels of slag recovery and seed utilization achieved by the combustor. Analytical support was also provided …
Date:
February 1, 1992
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
The RQM triangle: A paradigm for relativistic quantum mechanics
A simple way to relate Lorentz transformations to a finite and discrete model of counter firings is presented. We first abstract from counter firings with finite resolution to rational fraction velocities and a finite step-length. Discrete Lorentz transformations and quantized rotations follow. These are encoded by three integers and a triangle with integer sides: the RQM Triangle. The double slit experiment allows us to observe quantized space steps and measure invariant step lengths for any particle in rational ratio to one such length for any convenient reference particle. A discrete version of the Mandelstam analysis of elastic and anelastic scattering is implied. The results fit naturally into the bit-string formalism used in earlier work.
Date:
February 1, 1992
Creator:
Noyes, H. Pierre
Object Type:
Article
System:
The UNT Digital Library
Standardization guide for construction and use of MORT-type analytic trees
Since the introduction of MORT (Management Oversight and Risk Tree) technology as a tool for evaluating the success or failure of safety management systems, there has been a proliferation of analytic trees throughout US Department of Energy (DOE) and its contractor organizations. Standard fault tree'' symbols have generally been used in logic diagram or tree construction, but new or revised symbols have also been adopted by various analysts. Additionally, a variety of numbering systems have been used for event identification. The consequent lack of standardization has caused some difficulties in interpreting the trees and following their logic. This guide seeks to correct this problem by providing a standardized system for construction and use of analytic trees. Future publications of the DOE System Safety Development Center (SSDC) will adhere to this guide. It is recommended that other DOE organizations and contractors also adopt this system to achieve intra-DOE uniformity in analytic tree construction.
Date:
February 1, 1992
Creator:
Buys, J.R.
Object Type:
Report
System:
The UNT Digital Library