4,411 Matching Results

Search Results

prev Results: 97 - 120 next
open access

Neutronics of a mixed-flow gas-core reactor

Description: The study was made to investigate the neutronic feasibility of a mixed-flow gas-core reactor. Three reactor concepts were studied: four- and seven-cell radial reactors and a seven-cell scallop reactor. The reactors were fueled with UF/sub 6/ (either U-233 or U-235) and various parameters were varied. A four-cell reactor is not practical nor is the U-235 fueled seven-cell radial reactor; however, the 7-cell U-233 radial and scallop reactors can satisfy all design criteria. The mixed flow gas cor… more
Date: November 1, 1977
Creator: Soran, P. D. & Hansen, G. E.
Partner: UNT Libraries Government Documents Department
open access

Evaluated nuclear data file of Th-232

Description: An evaluated nuclear data file for thorium is described. The file extends over the energy range 0.049 (i.e., the inelastic-scattering threshold) to 20.0 MeV and is formulated within the framework of the ENDF system. The input data base, the evaluation procedures and judgments, and ancillary experiments carried out in conjunction with the evaluation are outlined. The file includes: neutron total cross sections, neutron scattering processes, neutron radiative capture cross sections, fission cross… more
Date: September 1, 1977
Creator: Meadows, J.; Poenitz, W.; Smith, A.; Smith, D.; Whalen, J. & Howerton, R.
Partner: UNT Libraries Government Documents Department
open access

ORNL TNS program: microwave start-up of tokamak plasmas near electron cyclotron and upper hybrid resonances

Description: The scenario of toroidal plasma start-up with microwave initiation and heating near the electron cyclotron frequency is suggested and examined here. We assume microwave irradiation from the high field side and an anomalously large absorption of the extraordinary waves near the upper hybrid resonance. The dominant electron energy losses are assumed to be due to magnetic field curvature and parallel drifts, ionization of neutrals, cooling by ions, and radiation by low Z impurities. It is shown by… more
Date: December 1, 1977
Creator: Peng, Y. K. M. & Borowski, S. K.
Partner: UNT Libraries Government Documents Department
open access

Form-stable crystalline polymer pellets for thermal energy storage. Phase 1

Description: The objective of this project was to develop a form-stable, crystalline polymer pellet TES bed material, useful in the 120 to 140/sup 0/C temperature range suitable for solar absorption air conditioning applications. This objective was achieved with a Si-O-Si crosslinked HDPE pellet material, demonstrated to have a high heat of fusion value (46 cal/g, approximately 98% of the HDPE's heat of fusion value prior to crosslinking). Further, on melt/freeze cycling of these TES pellets through 400 cyc… more
Date: July 1, 1977
Creator: Botham, R.A.; Jenkins, G.H.; Ball, G.L. III & Salyer, I.O.
Partner: UNT Libraries Government Documents Department
open access

Evaluation of the /sup 232/Th neutron capture cross section above 3 keV

Description: This memo describes an evaluation of the /sup 232/Th neutron capture cross section in the neutron energy range from 3 keV to 20 MeV. Most existing differential measurements are reviewed, and some data are renormalized to current values of the standards. Several experimentally determined sets of average resonance parameters are also discussed. From 3 to 50 keV the evaluated cross section is described by a set of average statistical resonance parameters. Above 50 keV the evaluated capture cross s… more
Date: December 1, 1977
Creator: de Saussure, G. & Macklin, R.L.
Partner: UNT Libraries Government Documents Department
open access

Outdoor sources of indoor air pollution

Description: Conservation measures that seal a building, like storm window installation, can significantly reduce its energy requirements. These measures also protect its occupants from air pollutants having outdoor sources but amplify any harmful effects of those generated indoors. Using these Fourier series techniques and an approximation of outdoor pollution peaks by step functions, we obtained the following results: the average daily concentration indoors is the same as outdoors for any pollutant with n… more
Date: November 1, 1977
Creator: Silberstein, S.
Partner: UNT Libraries Government Documents Department
open access

Energy use in Japan and the United States

Description: This comparative study was undertaken to explain in part the per capita differential between the two countries. In the introduction, the ratios of energy per capita and energy per dollar of Gross Domestic Product (GDP) are presented. The exchange rates utilized to convert GDP to a common currency are discussed in detail. Brief sections on the energy supply and electric generation situation in Japan are included for background information, followed by the body of the report devoted to the energy… more
Date: August 1, 1977
Creator: Doernberg, A
Partner: UNT Libraries Government Documents Department
open access

LMFBR safety program. Annual technical progress report. Government fiscal year, 1977

Description: Information is presented concerning the development of the SOMIX-1 computer code for sodium drop burning analysis; experimental analysis of burning sodium drops; aerosol leakage from containment buildings; high-temperature-concentration aerosols; aerosol source term from vaporized fuel; properties of high-temperature fuel mixtures; and development of the COMRADEX computer code for analysis of radiological doses in the environment from LMFBR accidents.
Date: December 15, 1977
Partner: UNT Libraries Government Documents Department
open access

NASA/DOE advanced thermionic technology program. Progress report No. 28

Description: Surface studies of thermionic emitters and collectors in the surface characterization chamber are described. Plasma studies including converter theory, experimental plasma analyses, and enhanced mode conversion experiments are discussed. Progress in thermionic converter development, the component hardware program, and the combustion-heated thermionic device program are outlined. (WHK)
Date: October 1, 1977
Partner: UNT Libraries Government Documents Department
open access

Conceptual design and systems analysis of photovoltaic power systems. Volume II. Systems. Revised final report

Description: Conceptual designs were made and analyses were performed on three types of solar photovoltaic power systems. Included were Residential (1--10 kW), Intermediate (0.1--10 MW), and Central (50--1000 MW) Power Systems to be installed in the 1985 to 2000 time period. Detailed descriptions of each of the three systems studied, descriptions of the necessary subsystems, and discussions of the interfaces between them are presented. Included also are descriptions of system performance and system cost use… more
Date: March 1, 1977
Creator: Pittman, P.F.
Partner: UNT Libraries Government Documents Department
open access

CDC 7600 LTSS programming stratagens: preparing your first production code for the Livermore Timesharing System

Description: This report deals with some techniques in applied programming using the Livermore Timesharing System (LTSS) on the CDC 7600 computers at the National Magnetic Fusion Energy Computer Center (NMFECC) and the Lawrence Livermore Laboratory Computer Center (LLLCC or Octopus network). This report is based on a document originally written specifically about the system as it is implemented at NMFECC but has been revised to accommodate differences between LLLCC and NMFECC implementations. Topics include… more
Date: August 15, 1977
Creator: Fong, K. W.
Partner: UNT Libraries Government Documents Department
open access

Comments on muon trapping. [HALO computer code]

Description: Muons that result from the collisions of protons in the ISABELLE beams with other nucleons introduce important background or signal for experiments. Their ability to pass through the conductors and steel of ISABELLE magnets results in complicated trajectories. Some oscillate about quasistable orbits and are called ''trapped.'' A number of typical trajectories were plotted, and flux estimates were made with a Monte Carlo program, HALO. Trapping tends to reduce shielding requi… more
Date: June 16, 1977
Creator: Stevens, A. J. & Thorndike, A. M.
Partner: UNT Libraries Government Documents Department
open access

Instrument for observing transient cosmic gamma-ray sources for the ISEE-C Heliocentric spacecraft

Description: Satellite instrumentation that would serve as one element of a three-satellite network to provide precise directional information for the recently discovered cosmic gamma-ray bursts is described. The proposed network would be capable of determining source locations with uncertainties of less than one arc minute, sufficient for a meaningful optical and radio search. The association of the gamma bursts with a known type of astrophysical object provides the most direct method for establishing sour… more
Date: December 1, 1977
Creator: Evans, W.D.; Aiello, W.P. & Klebesadel, R.W.
Partner: UNT Libraries Government Documents Department
open access

System model for analysis of the mirror fusion-fission reactor

Description: This report describes a system model for the mirror fusion-fission reactor. In this model we include a reactor description as well as analyses of capital cost and blanket fuel management. In addition, we provide an economic analysis evaluating the cost of producing the two hybrid products, fissile fuel and electricity. We also furnish the results of a limited parametric analysis of the modeled reactor, illustrating the technological and economic implications of varying some important reactor de… more
Date: October 12, 1977
Creator: Bender, D.J. & Carlson, G.A.
Partner: UNT Libraries Government Documents Department
open access

Hydrodynamic behavior of a bare rod bundle. [LMFBR]

Description: The temperature distribution within the rod bundle of a nuclear reactor is of major importance in nuclear reactor design. However temperature information presupposes knowledge of the hydrodynamic behavior of the coolant which is the most difficult part of the problem due to complexity of the turbulence phenomena. In the present work a 2-equation turbulence model--a strong candidate for analyzing actual three dimensional turbulent flows--has been used to predict fully developed flow of infinite … more
Date: June 1, 1977
Creator: Bartzis, J.G. & Todreas, N.E.
Partner: UNT Libraries Government Documents Department
open access

Sampling and characterization of sodium-water reaction products

Description: Sodium-water reaction products (SWRP) which had accumulated in the bottom of the reaction products tank (RPT) of the Large Leak Test Rig (LLTR) were sampled and characterized. Analysis showed that the SWRP consisted of NaOH, Na/sub 2/O, NaH, and Na, as expected, in varying proportions. The unreacted sodium in the samples examined ranged from 32 to 60% by weight. The SWRP reacts (dissolves) rapidly and completely with ethanol, and somewhat less rapidly and completely with Dowanol PM. A magnetic,… more
Date: October 13, 1977
Creator: Eichelberger, R.L.
Partner: UNT Libraries Government Documents Department
open access

Estimate of earth media shear strength at the Nevada Test Site

Description: A method is presented of estimating the effective shear strength of the fractured rock that surrounds a nuclear detonation. To do this, we measure the cavity radii from previous detonations. We also use numerical computer codes to model the explosion phenomenology and develop the functional relationship between the normalized cavity displacement and the normalized shear strength of the rock. In this sense, the computer codes serve as replica models that are dimensionally analyzed to interpret t… more
Date: November 3, 1977
Creator: Terhune, R. W. & Glenn, H. D.
Partner: UNT Libraries Government Documents Department
open access

Report on emergency electrical power supply systems for nuclear fuel cycle and reactor facilities security systems

Description: The report includes information that will be useful to those responsible for the planning, design and implementation of emergency electric power systems for physical security and special nuclear materials accountability systems. Basic considerations for establishing the system requirements for emergency electric power for security and accountability operations are presented. Methods of supplying emergency power that are available at present and methods predicted to be available in the future ar… more
Date: January 1, 1977
Partner: UNT Libraries Government Documents Department
open access

Federal role in dry and wet-dry cooling tower research, development, and demonstration

Description: It is concluded that it is appropriate for the Energy Research and Development Administration (or its successor) to sponsor a program of fiscal, technical and management support directed at providing a commercial advanced concept wet/dry (or dry) cooling technology for electric utility use within ten years. This federal role is thought to be appropriate for several reasons, including: the need for such technology, although expected to grow only slowly at first, will eventually be quite widespre… more
Date: September 1, 1977
Partner: UNT Libraries Government Documents Department
open access

Building 431 fire tests

Description: An extensive discussion of considerations for fire protection in the LLL mirror fusion test facility (MFTF) is presented. Because of the large volume and high bays of the building, sufficient data on fire detection is unavailable. Results of fire detection tests using controlled fire sources in the building are presented. Extensive data concerning the behavior of the building atmosphere are included. Candidate fire detection instrumentation and extinguishing systems for use in the building are … more
Date: October 24, 1977
Creator: Alvares, N. J.; Beason, D. G.; Ford, H. W. & Magee, M. W.
Partner: UNT Libraries Government Documents Department
open access

Near-isotropic petroleum-coke based graphites for high temperature gas-cooled reactor core components

Description: The standard covers procurement requirements for extruded graphite logs, 15 in. (381 mm) or greater in diameter, manufactured with near-isotropic petroleum cokes and coal-tar pitch binders which are candidates or reference materials for replaceable fuel and reflector blocks for High-Temperature Gas-Cooled Reactors (HTGRs). The requirements are designed to produce the degree of lot-to-lot reproducibility which is required to ensure consistent and predictable properties and irradiation performanc… more
Date: October 1, 1977
Partner: UNT Libraries Government Documents Department
Back to Top of Screen