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THE DEVELOPMENT OF A SUMP-TYPE SOLIDIFIED-METAL SEAL

Description: A solidified-metal seal for possible use in moIten-saIt systems was fabricated and tested on a laboratory scale/su The seal consisted of an 80 Au-20 Cu (wt%) sealant alloy in contact with IN0R-8 base metal/su Eleven successive helium-leak-tlght sealings were effected before termination of the test due to a leak in one of the mating parts/su With better control over the heating cycle and slight modifications in seal design, it is expected that the useful life of a seal of this type could be exte… more
Date: March 15, 1962
Creator: Donnelly, R.G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Protective coatings and sealants for solar applications

Description: An aging study has been completed which evaluated a number of polymeric materials for potential use as (1) protective coatings for back surfaces of mirrors and (2) solar heliostat edge seals. These investigations were conducted in an artificial weathering chamber that accelerated thermal cycling. The primary mirror failure mode was observed to be silver corrosion resulting from moisture exposure. To increase mirror longevity in current heliostat designs, intimate bonding at all the composite in… more
Date: September 1, 1980
Creator: Wischmann, K. B. & Gonzales, M. H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Method for fabricating a seal between a ceramic and a metal alloy

Description: A method of fabricating a seal between a ceramic and an alloy comprising the steps of prefiring the alloy in an atmosphere with a very low partial pressure of oxygen, firing the assembled alloy and ceramic in air, and gradually cooling the fired assembly to avoid the formation of thermal stress in the ceramic. The method forms a bond between the alloy and the ceramic capable of withstanding the environment of a pressurized water reactor and suitable for use in an electrical conductivity sensiti… more
Date: July 24, 1981
Creator: Kelsey, P.V. Jr. & Siegel, W.T.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
open access

Remote Plastic Bag Passout Unit for High-Level Radiochemical Operations

Description: A system is designed for making remote sealed-bag passouts from a multicurie-level chemistry processing enclosure. The polyethylene bags are changed remotely without exposing contaminated surfaces while always maintaining a low leak rate seal. The system employs an interchange box (passout box) attached to the chemistry enclosure. Integrated with the box is a hydraulically operated jack that raises and lowers the bags, and a welder-cutter for sealing them. A single master-slave manipulator team… more
Date: August 1, 1961
Creator: Fleischer, E. S.; Parsons, T. C. & Howe, P. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

TRU Waste Sampling Program: Volume II. Gas generation studies

Description: Volume II of the TRU Waste Sampling Program report contains the data generated from evaluating the adequacy of venting/filtering devices for maintaining safe hydrogen levels in plutonium contaminated waste drums. Additional studies reported in this volume include gas generation rates, selected waste form monitoring, and evaluation of hydrogen migration from sealed 90-mil rigid polyethylene drum liners containing /sup 238/Pu-contaminated wastes. All wastes used in the studies were newly-generate… more
Date: September 1, 1985
Creator: Clements, T.L. Jr. & Kudera, D.E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A Theoretical Study of the Transient Operation and Stability of Two-Phase Natural Circulation Loops

Description: Mathematical models of the time-dependent behavior of two-phase natural- circulation loops were used to predict the operation and to explain the unusual instability sometimes observed. The initial results obtained for a loop similar to the Univ. of Minnesota loop were used to formulate a more complex and accurate model, and the predicted transient behavior was in close agreement with the experimental results from the Minnesota loop. For a 300psia, high-pressure loop, unstable oscillatory behavi… more
Date: June 1, 1961
Creator: Garlid, K.; Amundson, N. R. & Isbin, H. S.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries Government Documents Department
open access

Vacuum system problems of EBT: a steady-state fusion experiment

Description: Many of the vacuum problems faced by EBT will soon be shared by other plasma devices as high-power microwave systems and long pulse lengths become more common. The solutions used on EBT (such as the raised lip with elastomer seal) are not unique; however, experience has shown that microwave-compatible designs must be carefully thought out. All details of the vacuum must be carefully thought out. All details of the vacuum must be carefully screened in advance to insure that microwaves do not lea… more
Date: January 1, 1981
Creator: Livesey, R.L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

AN ANALYSIS TO DETERMINE THE PERCENTAGE OF HELIUM BYPASSING THE CORE DUE TO THE REFLECTOR SEALING SYSTEM DURING NORMAL OPERATION OF THE HTGR

Description: The percentage of helium which will bypass the core if the reflector system shown is used is predicted. It is estimated that nominally about 0.1 to 0.2% of the total flow will bypass the core, which is not considered excessive. The most difficult parameter to determine was Z, the gap between the sealing surfaces. The method used to predict Z is presented. The effect of bowing due to a temperature gradient across the seals is discussed. (auth)
Date: November 15, 1961
Creator: Nimtz, F.B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Analysis of LOFT steam generator main feed piping loop seal modification

Description: The stress analysis is presented for the proposed loop seal modification to the LOFT Steam Generator Main Feed Piping. THE SAP IV finite element computer program was used to analyze normal, upset, emergency, and faulted conditions. Results of the analysis indicate that the modified main feed piping system will satisfy all structural adequacy criteria specified in Subarticle NC-3650 of the ASME Boiler and Pressure Vessel Code. Results also show that the isolation snubber configuration, specified… more
Date: February 14, 1978
Creator: Nitzel, M.E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Molten salt freeze seal. Final report

Description: This report documents the results of the testing performed at Sandia National Laboratory, Albuquerque, New Mexico, on the applicability of a sodium freeze seal type valve stem in a molten salt environment. The freeze seal tests consisted of cycling the valve stem at set temperature intervals, checking the temperature distribution for freeze plug location, and verifying the actuator forces. In addition to the test results, this report also documents the engineering analysis and other tasks perfo… more
Date: August 1, 1985
Creator: Corugedo, J.J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Sperry Low Temperature Geothermal Conversion System, Phase I and Phase II. Volume V. Component development. Final report

Description: The fundamental inventions which motivate this program are system concepts centered on a novel heat engine cycle and the use of downwell heat exchange. Here, the primary emphasis is on downwell hardware. The only surface equipment included is the surface portion of the instrumentation and control systems. Downwell instrumentation is reported. Downwell conduits and techniques for installing, connecting and sealing them are covered. The downwell turbine-pump unit (TPU) is a critical component sin… more
Date: January 1, 1984
Creator: Harvey, C.; McBee, W. & Matthews, H.B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Aging assessment of BWR control rod drive systems

Description: This study examines the aging phenomena associated with boiling water reactor (BWR) control rod drive mechanisms (CRDMs) and assess the merits of various methods of managing this aging. Information for this study was acquired from (1) the results of a special CRDM aging questionnaire distributed to each US BWR utility, (2) a first-of-its-kind workshop held to discuss CRDM aging and maintenance concerns, (3) an analysis of Nuclear Plant Reliability Data System (NPRDS) failure cases attributed to… more
Date: January 1, 1991
Creator: Greene, R.H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

HMC-to-flatpack attachment

Description: A method has been developed for attaching a completed hybrid microcircuit to a flatpack which can then be hermetically sealed. Ablefilm 517B and Epo-Tek H77 epoxies, in conjunction with an abraded flatpack and applied pressure during cure, were shown to provide HMC-to-flatpack bonds which meet all environmental and processing requirements of hybrid microcircuits in two recent programs.
Date: April 1, 1978
Creator: Zawicki, L.R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

SNAP 2 PRIMARY SYSTEM TEST-OBJECTIVES, SYSTEM DESCRIPTION, AND PROCEDURES

Description: The SNAP-2 Primary System Test loop fabrication was completed with associated flight prototype components including reactor core and boiler mockups for volume and DELTA P simulation, CRU-IIII NaK pump, compact heater, and expansion compensator. A mobile loading system was designed and fabricated with the capability of cleaning the NaK prior to final loop sealing. Loop descriptions, test objectives, and operating procedures are presented. (auth)
Date: June 12, 1961
Creator: Kikin, G.M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A miniature inexpensive, oxygen sensing element

Description: An exhaustive study was conducted to determine the feasibility of Nernst-type oxygen sensors based on ceramics containing Bi{sub 2}O{sub 3}. The basic sensor design consisted of a ceramic sensing module sealed into a metal tube. The module accommodated an internal heater and thermocouple. Thermal-expansion-matched metals, adhesives, and seals were researched and developed, consistent with sequential firings during sensor assembly. Significant effort was devoted to heater design/testing and to m… more
Date: October 7, 1991
Creator: Arenz, R. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Testing of modified Li/SO/sub 2/ cells

Description: Long-term storage and discharge tests of lithium/sulfur dioxide cells indicated three specific failure modes resulting in premature failure. Further studies resulted in several potential solutions. Small lots of Li/SO/sub 2/ D cells incorporating different combinations of potential fixes were ordered from two manufacturers. These cells were placed on an accelerated test for approximately five months. After removal from the test, each cell was examined microscopically, and the relative merits of… more
Date: January 1, 1980
Creator: Levy, S. C.; Street, H. K. & Crafts, C. C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Helium/solid powder O-ring leakage correlation experiments using a radiotracer

Description: UO/sub 2/ definitely leaked past the O-ring in three of the tests confirming the major results of the previous work. Continuous leakage at these levels may require additional precautions under present regulatory policies. The mechanism and the time and particle size dependence for the leakage are not known, but there is some indication leakage is more likely at low temperatures. It is possible leakage is due to movement of the O-ring during temperature or pressure cycling at the beginning or en… more
Date: January 1, 1984
Creator: Bild, R. W.; Leisher, W. B.; Weissman, S. H. & Seya, M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Barium silicate glass/Inconel X-750 interaction. [PWR]

Description: Water reactor safety programs at the Idaho National Engineering Laboratory have required the development of specialized instrumentation. An example is the electrical conductivity-sensitive liquid level transducer developed for use in pressurized-water reactors (PWRs) in which the operation of the sensing probe relies upon the passage of current through the water between the center pin of the electrode and its shell such that when water is present the resulting voltage is low, and conversely, wh… more
Date: January 1, 1980
Creator: Kelsey, P.V. Jr.; Siegel, W.T. & Miley, D.V.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Measurement and effect of the critical gas saturation and relative permeability on the production of methane from geopressured aquifers of saturated brine

Description: The attempt to measure critical gas saturation at pressures in the range of 5000 to 10,000 psi failed. It proved impossible, with the funds and time available, to conclude a successful suite of experiments. The problem was centered on the inability to maintain adequate seals on the end plates of the apparatus. Numerical simulation confirmed that the level of critical gas saturation required for methane to be produced profitably from geopressured aquifers was unrealistically high. Most of the wa… more
Date: March 1, 1982
Creator: Doscher, T.M.; Azari, M. & Marinello, S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Removable, hermetically-sealing, filter attachment system for hostile environments

Description: A removable and reusable filter attachment system is disclosed. A filter medium is fixed to, and surrounded by, a filter frame having a coaxial, longitudinally extending, annular rim. The rim engages an annular groove which surrounds the opening of a filter housing. The annular groove contains a fusible material and a heating mechanism for melting the fusible material. Upon resolidifying, the fusible material forms a hermetic bond with the rim and groove. Remelting allows detachment and replace… more
Date: June 3, 1981
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
open access

Monitoring well systems in geothermal areas

Description: The ability to monitor the injection of spent geothermal fluids at reasonable cost might be greatly improved by use of multiple-completion techniques. Several such techniques, identified through contact with a broad range of experts from the groundwater and petroleum industries, are evaluated relative to application in the typical geologic and hydrologic conditions of the Basin and Range Province of the Western United States. Three basic monitor well designs are suggested for collection of pres… more
Date: March 1, 1982
Creator: Lofgren, B.E.; O'Rourke, J.; Sterrett, R.; Thackston, J. & Fain, D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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