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in subjects: "Mechanical Structures"

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Development of 400- to 450-MHz RFQ resonator-cavity mechanical designs

In the development of the radio-frequency quadrupole (RFQ) linac, the resonator cavity's mechanical design may be a challenge similar in magnitude to that of the development of the accelerator structure itself. Experience with the all-copper 425-MHz RFQ proof-of-principle linac has demonstrated that the resonator cavity must be structurally stiff and easily tunable. This experience has led to development of copper-plated steel structures having vanes that may be moved within a cylinder for tuni… more

Date: January 1, 1982

Creator: Hansborough, L.D.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Seismic response analysis for structures with non-orthogonal modes

For seismic analysis of structures in nuclear industry, the spectrum method of modal combination acceptable to US Nuclear Regulatory Commission is applicable only to systems with orthogonal natural modes. When a structure with frequency dependent boundary conditions is set in motion, its natural modes of vibration are generally non-orthogonal. Based on such a structure, the spectrum method of modal composition is generalized to include systems with non-orthogonal modes. The generalized expressi… more

Date: January 1, 1980

Creator: Yau, W. F.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Vibration considerations in the design of the Advanced Photon Source at Argonne National Laboratory

The Advanced Photon Source (APS), a new synchrotron radiation facility being built at Argonne National Laboratory, will provide the world's most brilliant X-ray beams for research in a wide range of technical fields. Successful operation of the APS requires an extremely stable positron closed orbit. Vibration of the storage ring quadrupole magnets, even in the submicron range, can lead to distortion of the positron closed orbit and to potentially unacceptable beam emittance growth, which result… more

Date: January 1, 1991

Creator: Jendrzejczyk, J.A. & Wambsganss, M.W.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

TFTR coil case design

The TFTR (TOKAMAK Fusion Test Reactor) TF (Toroidal Field) coil cases are highly loaded structures designed within severe constraints. Foremost among these are basic machine geometry, material characteristics of both the case and the copper/epoxy matrix it supports, and overall cost. Scoping and parametric studies have been performed continuously since conceptual design. The progression of design decisions including coil shape, support locations and their stiffnesses, material selection, and el… more

Date: January 1, 1977

Creator: Pusateri, J.; Barnes, G. & Citrolo, J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Benefits of vertical and horizontal seismic isolation for LMR (liquid metal reactor) nuclear reactor units

Seismic isolation has been shown to be able to reduce transmitted seismic force and lower response accelerations of a structure. When applied to nuclear reactors, it will minimize seismic influence on the reactor design and provide a design which is less site dependent. In liquid metal reactors where components are virtually at atmospheric pressure but under severe thermal conditions, thin-walled structures are generally used for primary systems. Thin-walled structures, however, have little inh… more

Date: January 1, 1988

Creator: Wu, Ting-shu; Chang, Y. W. & Seidensticker, R. W.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Central receiver solar thermal power system, Phase 1. CDRL Item 2. Pilot plant preliminary design report. Volume IV. Receiver subsystem. [10-MW Pilot Plant and 100-MW Commercial Plant]

The conception, design, and testing of the receiver subsystem proposed by the McDonnell Douglas/Rocketdyne Receiver team for the DOE 10-MW Pilot Plant and the 100-MW Commercial Plant are described. The receiver subsystem consists of the receiver unit, the tower on which the receiver unit is mounted above the collector field, and the supporting control and instrumentation equipment. The plans for implementation of the Pilot Plant are given including the anticipated schedule and production plan (… more

Date: November 1, 1977

Creator: Hallet, Jr., R. W. & Gervais, R. L.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

A many particle-tracking detector with drift planes and segmented cathode readout

We describe the design and performance of a detector system for tracking charged particles in an environment of high track density and rates up to 1 MHz. The system operates in the forward spectrometer of the BNL Heavy Ion experiment E814 and uses principles of general interest in high rate, high multiplicity applications such as at RHIC or SSC. We require our system to perform over a large dynamic range, detecting singly charged particles as well as fully ionized relativistic {sup 28}Si. Resul… more

Date: January 1, 1990

Creator: Fischer, J.; Lissauer, D.; Ludlam, T.; Makowiecki, D.; O'Brien, E.; Radeka, V. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Static and dynamic analyses on the MFTF-B vacuum vessel. Revision 1

The Mirror Fusion Test Facility is a major magnetic fusion energy project at the Lawrence Livermore National Laboratory. An important component of this facility is the vacuum vessel, which forms the vacuum chamber. The vessel is supported on twenty-two pairs of legs that rest on reinforced concrete piers. In performing static and dynamic analyses on the vacuum vessel, we separately investigated the load distribution under gravity loads, pressure loads, electromagnetic loads, and thermal loads. … more

Date: January 15, 1984

Creator: Ng, D.S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Probability based load criteria for the design of nuclear structures: a critical review of the state-of-the-art

Structures for nuclear power plant facilities must be designed to withstand safely and effectively all kinds of loads and load combinations that may be expected to occur during their lifetime. The traditional methods of structural design attempt to account for the inevitable variability in the loads, material strengths, in-service environments, and fabrication process, etc., through the use of safety factor, allowable stresses or load and resistance factors. These approaches may result in an un… more

Date: April 1, 1981

Creator: Shinozuka, M.; Ellingwood, B.R.; Wang, P.C.; Meyer, C.; Wen, Y.K.; Kao, S. et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Solar photovoltaic applications seminar: design, installation and operation of small, stand-alone photovoltaic power systems

This seminar material was developed primarily to provide solar photovoltaic (PV) applied engineering technology to the Federal community. An introduction to photoconductivity, semiconductors, and solar photovoltaic cells is included along with a demonstration of specific applications and application identification. The seminar details general systems design and incorporates most known information from industry, academia, and Government concerning small solar cell power system design engineering… more

Date: July 1, 1980

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Painter Street Overcrossing: Linear-elastic finite element dynamic analysis

Painter Street Overcrossing is a two span continuous box girder bridge Highway 101 near Rio Del, California. It has been heavily instrumented with strong motion accelerometers by the California Department of Mines and Geology Strong Motion Instrumentation Program. On 11/21/86, the response of the bridge to a magnitude 5.1 earthquake (epicentral distance 32 km) was measured. This report considers the data generated at stations six, seven, and eight, during this earthquake. Station six recorded t… more

Date: August 1, 1991

Creator: Salveson, M.W.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Detection of structural degradation

A time domain method developed for determining dynamic system characteristics is applied to structural monitoring and/or flaw detection. The potential usefulness for monitoring is evaluated based on several criteria, which include sensitivity to structural changes, location of flaws, and dependence upon excitation signals. The strengths and weaknesses of the methods are discussed. Also, structural monitoring using a signal's singular values is presented and evaluated. 2 refs., 4 figs., 2 tabs.

Date: January 1, 1991

Creator: Endebrock, E.G.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Hydraulic pressure pulses with elastic and plastic structural flexibility: test and analysis (LWBR Development Program)

Pressure pulse tests were conducted with a flexible test section in a test vessel filled with room temperature water. The pressure pulses were generated with a drop hammer and piston pulse generator and were of a sufficient magnitude to cause plastic deformation of the test section. Because of the strong pressure relief effect of the deforming test section, pressure pulse magnitudes were below 265 psig in magnitude and had durations of 50 to 55 msecs. Calculations performed with the FLASH-35 bi… more

Date: March 1978

Creator: Schwirian, R. E.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Design of the core support and restraint structures for FFTF and CRBRP

This paper presents and compares the design and fabrication of the FFTF and CRBRP reactor structures which support and restrain the reactor core assemblies. The fabrication of the core support structure (CSS) for the FFTF reactor was completed October 1972 and this paper discusses how the fabrication problems encountered with the FFTF were avoided in the subsequent design of the CRBR CSS. The radial core restraint structure of the FFTF was designed and fabricated such that an active system coul… more

Date: December 1, 1977

Creator: Sutton, H.G. & Rylatt, J.A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Thermal-stress analysis of a Fort St. Vrain core-support block under accident conditions

A thermoelastic stress analysis of a graphite core support block in the Fort St. Vrain High Temperature Gas Cooled Reactor is described. The support block is subjected to thermal stresses caused by a loss of forced circulation accident of the reactor system. Two- and three-dimensional finite element models of the core support block are analyzed using the ADINAT and ADINA codes, and results are given that verify the integrity of this structural component under the given accident condition.

Date: January 1, 1982

Creator: Carruthers, L. M.; Butler, T. A. & Anderson, C. A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Seismic analysis of reactor exhaust air filter compartment

The Filter Compartment (FC) in this analysis is a generic reactor airborne activity confinement filter compartment which possesses all the essential physical and mechanical properties of the Savannah River Site (SRS) confinement filters of Reactor Buildings K, L, and P. The filters belong to the Airborne Activity Confinement System (AACS). These filters absorb a significant amount of radioactive effluents from the exhausting air. The seismic excitation is input indirectly from the output of the… more

Date: September 24, 1990

Creator: Gong, Chung; Funderburk, E.L. & Jerrell, J.W.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Eulerian method for large-displacement fluid-structure interaction in reactor containments

An Eulerian method for analyzing large-displacement fluid-structure interaction in reactor containments is presented. The emphasis is on the development of a generalized hydrodynamic scheme to treat the irregular cells created by the movement of the structure with respect to the fixed Eulerian coordinates. A relaxation equation is derived from the boundary condition at the fluid-structure interface for the solution of the pressure at the interface. By combining this with the Poisson equation a … more

Date: January 1, 1977

Creator: Chang, Y. W. & Wang, C. Y.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Inert Electrodes Program fiscal year 1988 annual report

The Inert Electrodes Program, being conducted by Pacific Northwest Laboratory (PNL), involves improving the Hall-Heroult cells used by the Aluminum Industry for the electrochemical production of aluminum. The PNL research centers on developing more energy efficient, longer-lasting anodes and cathodes and ancillary equipment. Major accomplishments for Fiscal Year 1988 are summarized below. 14 refs., 56 figs., 9 tabs.

Date: October 1, 1989

Creator: Strachan, D.M.; Marschman, S.C.; Davis, N.C.; Friley, J.R. & Schilling, C.H.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Durability testing at one atmosphere of advanced catalysts and catalyst supports for automotive gas turbine engine combustors. Part 1

Studies were conducted to experimentally demonstrate the durability catalysts and catalyst supports in a combustion environment. A test of 1000 hours duration was completed with two catalysts, using No. 2 diesel fuel and operating at catalytically supported thermal combustion conditions. This atmospheric pressure durability test was conducted, using an air preheat temperature of about 640/sup 0/K and a reference velocity of about 14 meters/second. The adiabatic flame temperature of the fuel/air… more

Date: June 1, 1977

Creator: Heck, R.M.; Chang, M.; Hess, H. & Carrubba, R.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Polymer concrete patching materials

The increased use of deicing salts is causing rapid deterioration of portland cement concrete bridge decks. Soluble chlorides cause corrosion of the steel reinforcing rods with a corresponding increase in volume of the rods. This expansion causes stresses in the concrete which result in delaminations and surface spalling. The repair of surface spalls with portland cement concrete can only be made if traffic can be avoided for several days. A patching material which would allow traffic to resume… more

Date: September 1, 1977

Creator: Fontana, J.J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

150 kWe solar-powered deep-well irrigation facility. Phase I. Preliminary design study. Final report

Results of a preliminary design study for a solar-powered irrigation facility to be located on a farm between Phoenix and Tucson, Arizona, are presented. The ERDA-specified generic design criteria are detailed. A detailed systems analysis is presented, and preliminary designs of the thermal storage system, organic Rankine cycle power system, cooling water system, power distribution system, and collector foundation are given. Site layout and improvements are described, and a cost analysis of pro… more

Date: August 8, 1977

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Seismic isolation of an electron microscope

A unique two-stage dynamic-isolation problem is presented by the conflicting design requirements for the foundations of an electron microscope in a seismic region. Under normal operational conditions the microscope must be isolated from ambient ground noise; this creates a system extremely vulnerable to seismic ground motions. Under earthquake loading the internal equipment forces must be limited to prevent damage or collapse. An analysis of the proposed design solution is presented. This study… more

Date: January 1, 1980

Creator: Godden, W.G.; Aslam, M. & Scalise, D.T.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Temporally stratified sampling programs for estimation of fish impingement

Impingement monitoring programs often expend valuable and limited resources and fail to provide a dependable estimate of either total annual impingement or those biological and physicochemical factors affecting impingement. In situations where initial monitoring has identified ''problem'' fish species and the periodicity of their impingement, intensive sampling during periods of high impingement will maximize information obtained. We use data gathered at two nuclear generating facilities in the… more

Date: January 1, 1977

Creator: Kumar, K. D. & Griffith, J. S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Resistive requirements for the vacuum wall of a Tokamak Fusion Reactor

The effect of having a conducting vacuum wall, instead of one with a flux breaker, has been analyzed from a multi-disciplinary standpoint. There is a good indication that a conducting wall will be tolerable. The most serious problems seem to be in designing an acceptable initiation-trimming coil system and in designing a vacuum wall that can withstand the pressure and heat loads following a plasma dump. There appear to be several promising design approaches for the vacuum wall that can achieve … more

Date: January 1, 1977

Creator: Brooks, J. N.; Ehst, D.; Harkness, S. D.; Norem, J.; Stevens, H. & Turner, L.

Item Type: Article

Partner: UNT Libraries Government Documents Department