330 Matching Results

Search Results

Results: 1 - 24 next
open access

TFTR ultrahigh-vacuum pumping system incorporating mercury diffusion pumps

Description: The TFTR vacuum vessel will have a system of four 61 cm diameter mercury diffusion pumps to provide a base pressure in the 10/sup -8/ to 10/sup -9/ Torr range as well as a low impurity level within the vessel. The system, called the Torus Vacuum Pumping System (TVPS), will be employed with the aid of an occasional 250/sup 0/C bakeout in situ as well as periodic applications of aggressive discharge cleaning. The TVPS is an ultrahigh-vacuum (UHV) system using no elastomers as well as being a clos… more
Date: June 1, 1976
Creator: Sink, D. A. & Sniderman, M.
Partner: UNT Libraries Government Documents Department
open access

Acoustic emission from beryllium

Description: The acoustic emission from both powder and ingot source beryllium has been measured as a function of strain and prior heat treatment. Most measurements were made during tensile deformation, but a limited number of compression tests have also been performed. The acoustic emission observed was of the burst type, with little or no contribution from continuous type emission. The emission was characterized by the variation of burst rate and average energy per burst as a function of strain. The tensi… more
Date: June 9, 1976
Creator: Heiple, C. R. & Adams, R. O.
Partner: UNT Libraries Government Documents Department
open access

Relative determination of W-values for alpha particles in tissue equivalent and other gases. [5. 4 MeV alpha particles]

Description: W (the average energy to form an ion pair) for 5.4 MeV /sup 241/Am alpha particles in a Rossi-type tissue equivalent (T.E.) gas, argon and methane was determined to an accuracy better than 0.2% using a new automated data handling system. A vibrating reed electrometer and current digitizer were used to measure the current produced by completely stopping the alpha particles in a large cylindrical ionization chamber. A multichannel analyzer, operating in a slow multiscalar mode, was used to store … more
Date: June 1, 1976
Creator: Krieger, G L
Partner: UNT Libraries Government Documents Department
open access

Finite-Element Analysis of a Thick-Wall Tube Containing a Crater-Like Surface Flaw

Description: A three-dimensional finite-element elastic analysis is carried out for a thick-wall tube (as sued in typical LMFBR steam generators) that contains a surface flaw in the form of a paraboloid of revolution. Effects of the depth and aspect ratio of the flaw on the stress distribution and stress concentration in the tube are explored.
Date: June 1976
Creator: Majumdar, S.
Partner: UNT Libraries Government Documents Department
open access

Noise Pollution from Expressways

Description: This paper provides an economic analysis of three noise abatement strategies designed to interrupt the path of noise between highways and residential areas, and makes some abatement policy suggestions.
Date: June 1976
Creator: Vaughan, Roger J. & Huckins, Larry
Partner: UNT Libraries Government Documents Department

Investigation of Reactivity Anomalies in EBR-II

Description: A data-collection and advisory team was formed to investigate observations of power reactivity decrement (PRD) and reactivity loss rate (RLR) obtained during EBR-II reactor run 74, because both the PRD and RLR were judged to be high during that run. This report describes the efforts to develop a realistic model explaining the reactivity observations for run 74 and presents recommendations for additional diagnostic information in the event of a recurrence of off-normal behavior of reactivity.
This item is restricted from view until June 1, 2076.
Date: June 1976
Creator: Walters, L. C.; Cutforth, D. C.; Forehand, H. M.; Hudman, G. D.; Larson, H. A.; MacFarlane, H. F. et al.
Partner: UNT Libraries Government Documents Department
open access

Reactivity and Power Shape Control : Theory and Numerical Applications

Description: An optimization method, based on linear programming, has been developed which determines the enrichment distribution in a multizone reactor such that the desired power distribution is achieved at BOL, as well as the poison distribution during reactor operation such that the reactor is kept critical and the desired power distribution is retained. For the numerical implementation of the method, the CYPRUS code has been written. Results of the application of the method are presented and input spec… more
Date: June 1976
Creator: Tzanos, Constantine P.
Partner: UNT Libraries Government Documents Department
open access

A Summary on Experimental Methods for Statistical Transient Analysis of Two-Phase Gas-Liquid Flow

Description: Much work has been done in the study of two-phase gas-liquid flows. Although it has been recognized superficially that such flows are not homogeneous in general, little attention has been paid to the inherent discreteness of the two-phase systems. Only relatively recently have fluctuating characteristics of two-phase flows been studied in detail. As a result, new experimental devices and techniques have been developed for use in measuring quantities previously ignored. This report reviews and s… more
Date: June 1976
Creator: Delhaye, Jean-Marc & Jones, Owen C., Jr.
Partner: UNT Libraries Government Documents Department
open access

Fuel Dynamics Loss-of-Flow Test L3 : Final Report

Description: The behavior of FTR-type, mixed-oxide, pre-irradiated, ''intermediate-power-structure'' fuel during a simulation of an FTR loss-of-flow accident was studied in the Mark-IIA integral TREAT loop. Analysis of the data reported here leads to a postulated scenario (sequence and timing) of events in the test. This scenario is presented, together with the calculated timing of events obtained by use of the SAS code.
Date: June 1976
Creator: Fischer, A. K.; Lo, R. K. & Barts, E. W.
Partner: UNT Libraries Government Documents Department
open access

Theory of Ionization by Electron Collisions

Description: The problem of calculating comprehensive sets of cross sections for ionization of atoms and molecules is reviewed. Emphasis is put on targets that are already ionized and lower-energy collisions for which the incident electron must be treated on a par with target electrons. The physical circumstances are discussed in which perturbation methods should be adequate, and special investigations are recommended to identify the relevant ranges of parameters more precisely and dependably. A new R-matri… more
Date: June 1976
Creator: Fano, Ugo & Inokuti, Mitio
Partner: UNT Libraries Government Documents Department
open access

Issues in the future supply of electricity to the Northeast. [1985 and 2000]

Description: This assessment of the problems of the electric sector is part of the BNL study on the Energy Future of the Northeast. Topics covered by the issue papers include the potential supply of energy to the Northeast from coal, oil, natural gas, liquefied natural gas, nuclear power, municipal waste, solar energy, and wind power, and the demand for energy in the Northeast from the industrial, transportation, and residential and commercial sectors. This paper compares energy demand projections derived i… more
Date: June 1, 1976
Creator: Meier, P. M.; McCoy, T. H. & Rahman, S.
Partner: UNT Libraries Government Documents Department
open access

High-burnup performance of mixed-oxide fuel rods clad in type 316SS of 0. 010- and 0. 015-inch wall thickness. [LMFBR]

Description: Two short mixed-oxide fuel rods of LMFBR design configuration were irradiated to a burnup of approx. 12.5 atom % in GETR. Profilometry at several intervals during the test indicated that the rod with a 0.010 inch thick cladding exhibited a diametral strain of 0.17% per atom % burnup, while the rod with a 0.015 inch thick cladding exhibited a lower diametral strain rate of 0.12% per atom % burnup. These data present the opportunity for analytical methods to evaluate fuel rod dimensional changes … more
Date: June 1, 1976
Creator: Wadekamper, D. C.; Plumlee, D. E. & Hilbert, R. F.
Partner: UNT Libraries Government Documents Department
open access

Concepts and methods of refrigeration for superconducting power transmission cables. Final report

Description: An analysis of refrigeration system requirements for the superconducting power transmission cables currently under study at the three principal US cable development centers indicates the need for cable system design considering the interrelated performance of the various cable system elements to successfully develop these systems for commercial operation in the 1990's. Hardware alternatives, compatible with the application timeframe, are evaluated to establish reliable refrigerator system … more
Date: June 1, 1976
Creator: Manatt, S. A.; Wapato, P. G.; Stanko, J. & Baumgartner, J. P.
Partner: UNT Libraries Government Documents Department
open access

User's manual for CNVUFAC, the general dynamics heat-transfer radiation view factor program

Description: CNVUFAC, the General Dynamics heat-transfer radiation veiw factor program, has been adapted for use on the LLL CDC 7600 computer system. The input and output have been modified, and a node incrementing logic was included to make the code compatible with the TRUMP thermal analyzer and related codes. The program performs the multiple integration necessary to evaluate the geometric black-body radiaton node to node view factors. Card image output that contains node number and view factor informatio… more
Date: June 25, 1976
Creator: Wong, R. L.
Partner: UNT Libraries Government Documents Department
open access

Two-phase flow in geothermal energy sources. Progress report No. 1: eight month period, October 1, 1975-May 30, 1976

Description: A detailed parametric study of the major variables that affect the pressure profile in the geothermal well, and hence its performance, was conducted in order to identify and define the pertinent problems that require further experimental and theoretical investigation. The well and, in particular, its two-phase section were modeled on the basis of sound two-phase flow principles. A computer algorithm was developed for pressure profile calculations and simulation of well performance. The algorith… more
Date: June 1, 1976
Partner: UNT Libraries Government Documents Department
open access

GRAY: a program to calculate gray-body radiation heat-transfer view factors from black-body view factors

Description: Program GRAY is written to perform the matrix manipulations necessary to convert black-body radiation heat-transfer view factors to gray-body view factors as required by thermal analyzer codes. The black-body view factors contain only geometric relationships. Program GRAY allows the effects of multiple gray-body reflections to be included. The resulting effective gray-body factors can then be used with the corresponding fourth-power temperature differences to obtain the net radiative heat flux.… more
Date: June 14, 1976
Creator: Wong, R. L.
Partner: UNT Libraries Government Documents Department
open access

Production of geothermal fluids by the natural flashing process. Design and analysis of geothermal wells in two-phase flow. First annual report

Description: The two-phase flow system is analyzed as it develops and changes in the well. The product of the study will be a calculational technique to allow the design of geothermal wells in two-phase flow. The overall approach to the project is summarized, and the nature of the two-phase flow problem is discussed. The various elements of the program are presented. (MHR)
Date: June 18, 1976
Partner: UNT Libraries Government Documents Department
open access

Evaluation of the fuel-conservation potential of truck aerodynamic-drag-reduction devices

Description: A study of commercially available and prototype aerodynamic drag reduction devices which can be retrofitted onto this nation's trucks to achieve significant fuel savings by 1980 was conducted. The results of the study are presented in seven sections. An overview of the basic study results is given in the Summary Section, and a brief introduction to the general nature of the truck drag problem and the study scope is contained in Section 1. Section 2 provides a more detailed discussion of the aer… more
Date: June 30, 1976
Partner: UNT Libraries Government Documents Department
open access

Nuclear Physics Laboratory 1976 annual report. [Nuclear Physics Laboratory, Univ. of Washington]

Description: Laboratory activities for the period spring, 1975 to spring, 1976 are described. The emphasis of the work can be discerned from the chapter headings: accelerator development; ion source development; instrumentation, detectors, research techniques; computer and computing; atomic physics; nuclear astrophysics; fundamental symmetries in nuclei; nuclear structure; radiative capture measurements and calculations; scattering and reactions; reactions with polarized protons and deuterons; heavy-ion ela… more
Date: June 1, 1976
Partner: UNT Libraries Government Documents Department
open access

Mathematical model for the preliminary analysis of dual-mode space nuclear fission solid core power and propulsion systems, NUROC3A. AMS report No. 1239a

Description: The three-volume report describes a dual-mode nuclear space power and propulsion system concept that employs an advanced solid-core nuclear fission reactor coupled via heat pipes to one of several electric power conversion systems. Such a concept could be particularly useful for missions which require both relatively high acceleration (e.g., for planetocentric maneuvers) and high performance at low acceleration (e.g., on heliocentric trajectories or for trajectory shaping). The first volume dev… more
Date: June 30, 1976
Creator: Grey, J. & Chow, S.
Partner: UNT Libraries Government Documents Department
open access

Computer code and users' guide for the preliminary analysis of dual-mode space nuclear fission solid core power and propulsion systems, NUROC3A. AMS report No. 1239b

Description: The three-volume report describes a dual-mode nuclear space power and propulsion system concept that employs an advanced solid-core nuclear fission reactor coupled via heat pipes to one of several electric power conversion systems. The second volume describes the computer code and users' guide for the preliminary analysis of the system.
Date: June 30, 1976
Creator: Nichols, R. A. & Smith, W. W.
Partner: UNT Libraries Government Documents Department
open access

Potential for graphite use adjacent to the plasma in nuclear fusion reactors

Description: The need to reduce high Z impurities in the plasma of fusion reactors has led to various ideas, including a low-Z liner, for isolating the first structural wall from the plasma. Graphite and other carbon containing materials (most notably SiC) are strong candidate materials for such liners. However, to assess the potential of these materials will require more information on the following properties: (1) Radiation effects under fusion reactor environment, (2) Sputtering, (3) Degassing. This docu… more
Date: June 1, 1976
Creator: Gray, W. J.; Morgan, W. C. & Tingey, G. L.
Partner: UNT Libraries Government Documents Department
Back to Top of Screen