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FLOWTRAN benchmarking with onset of flow instability data from 1988 Columbia University single-tube OFI experiment

Description: Benchmarking FLOWTRAN, Version 16.2, with an Onset of Significant Voiding (OSV) criterion against measured Onset of Flow Instability (OFI) data from the 1988--89 Columbia University downflow tests has shown that FLOWTRAN with OSV is a conservative OFI predictor. Calculated limiting flow rates based on the Savannah River Site (SRS) OSV criterion were always higher than the measured flow rates at OFI. This work supplements recent FLOWTRAN benchmarking against 1963 downflow tests at Columbia Unive… more
Date: June 1, 1990
Creator: Chen, K.; Paul, P. K. & Barbour, K. L.
Partner: UNT Libraries Government Documents Department
open access

Exact calculations of nuclear-recoil energies from prompt gamma decays resulting from neutron capture

Description: The results of an accurate determination of the recoil spectrum from (n, ..gamma..) reactions in molybdenum are presented. The recoil spectrum has been calculated from nuclear level structure data and measured branching ratios. Angular correlations between successive gammas have been accounted for using the standard theoretical techniques of Racah algebra and the density matrix formalism.
Date: July 20, 1981
Creator: Kinney, J.H.
Partner: UNT Libraries Government Documents Department
open access

Economic measurement of environment damages

Description: The densities, energy consumption, and economic development of the increasing population exacerbate environmental degradation. Air and water pollution is a major environmental problem affecting life and health, outdoor recreation, household soiling, vegetation, materials, and production. The literature review indicated that numerous studies have assessed the physical and monetary damage to populations at risk from excessive concentrations of major air and water pollutants-sulfur dioxide, total … more
Date: May 1, 1980
Creator: Krawiec, F.
Partner: UNT Libraries Government Documents Department
open access

An analysis of grazing incidence metal mirrors in a laser ICF reactor driver

Description: Grazing incidence metal mirrors (GIMMs) are examined to replace dielectric mirrors for the final elements in a laser beam line for an inertial confinement fusion reactor. For a laser driver with a wavelength from 250 to 500 nm in a 10-ms pulse, irradiated mirrors made of Al, Al alloys, or Mg were found to have calculated laser damage limits of 0.3--2.3 J/cm{sup 2} of beam energy and neutron lifetime fluence limits of over 5 {times} 10{sup 20} 14 MeV n/cm{sup 2} when used at grazing incidence an… more
Date: July 12, 1991
Creator: Bieri, R. & Guinan, M.
Partner: UNT Libraries Government Documents Department
open access

Predictability of formation damage: An assessment study and generalized models

Description: The project objective is to develop improved generalized predictive models to be used for investigation of reservoir formation damage and control for various fluid and rock conditions and to account for these effects in reservoir simulation. To accomplish its objective the proposed study will first critically study and evaluate the previous modeling efforts and the experimental studies reported in the literature. Then, generalized predictive models will be formulated by combining the previous a… more
Date: January 1, 1991
Creator: Civan, F.
Partner: UNT Libraries Government Documents Department
open access

Handbook of nuclear power plant seismic fragilities, Seismic Safety Margins Research Program

Description: The Seismic Safety Margins Research Program (SSMRP) has a gola to develop a complete fully coupled analysis procedure (including methods and computer codes) for estimating the risk of an earthquake-induced radioactive release from a commercial nuclear power plant. As part of this program, calculations of the seismic risk from a typical commercial nuclear reactor were made. These calculations required a knowledge of the probability of failure (fragility) of safety-related components in the react… more
Date: December 1, 1983
Creator: Cover, L.E.; Bohn, M.P.; Campbell, R.D. & Wesley, D.A.
Partner: UNT Libraries Government Documents Department
open access

ORNL irradiation creep facility

Description: A machine was developed at ORNL to measure the rates of elongation observed under irradiation in stressed materials. The source of radiation is a beam of 60 MeV alpha particles from the Oak Ridge Isochronous Cyclotron (ORIC). This choice allows experiments to be performed which simulate the effects of fast neutrons. A brief review of irradiation creep and experimental constraints associated with each measurement technique is given. Factors are presented which lead to the experimental choices ma… more
Date: September 1, 1980
Creator: Reiley, T. C.; Auble, R. L.; Beckers, R. M.; Bloom, E. E.; Duncan, M. G.; Saltmarsh, M. J. et al.
Partner: UNT Libraries Government Documents Department
open access

Second-generation-heliostat optimization studies. Final report

Description: The objective of this study was to define and quantify cost reductions in the Martin Marietta Denver Aerospace Second Generation Heliostat resulting from design and cost optimization. These cost reductions were based on optimizing the heliostat performance vs. cost and engineering design, and reviewing the design specification in selected technological areas with a goal of removing nonrealistic requirements and eliminating or minimizing overdesign. Specific technological areas investigated were… more
Date: May 1, 1982
Partner: UNT Libraries Government Documents Department
open access

Operational accidents and radiation exposures at ERDA facilities, 1975-1977

Description: The Energy Research and Development Administration (ERDA) accident frequency and losses were similar to that of the Atomic Energy Commission (AEC) from 1970 through 1974. The ERDA incidence rates per 200,000 work hours were 1.05 for lost workday injuries and 17.8 for workdays lost. These rates are about one-third of the national industrial averages reported by the National Safety Council (NSC). Ten fatalities occurred at ERDA facilities resulting in an average annual rate of three deaths per 10… more
Date: May 1, 1980
Partner: UNT Libraries Government Documents Department
open access

(Continuous damage mechanics: Critical states: Technical progress report)

Description: Failure can occur in many distinctly different ways depending on the material, stress and strain fields, temperature field, environmental effects, strain rate, etc. The proposed research program will focus on a single well defined class of failure modes common to many structures and machine elements. This class of problems is characterized by a gradually evolving microscale process which at a certain point triggers a discontinuous or singular (qualitative) change of macroscale response. Conside… more
Date: January 1, 1992
Creator: Krajcinovic, D.
Partner: UNT Libraries Government Documents Department
open access

Benefit-cost framework for analysis of trace element emissions from coal-fired power plants. [103 references]

Description: The major conclusions of this report may be summarized in the following four points: (1) It is probable that atmospheric emissions of trace elements from Southwestern coal-fired power plants will not cause major problems over the next 20 years. But monitoring for trace element build-up (especially mercury, selenium, and arsenic) in the mountains of southern Colorado, Navajo Reservoir, and other local hot spots would be an important and desirable step. (2) It appears that damage from trace eleme… more
Date: November 1, 1979
Partner: UNT Libraries Government Documents Department
open access

Field study of moisture damage in walls insulated without a vapor barrier. Final report for the Oregon Department of Energy

Description: Considerable uncertainty has existed over whether or not wall insulation installed without a vapor barrier causes an increased risk of moisture damage (wood decay) within walls. This report describes the results of one of the first major studies in the country aimed at finding out if such a moisture problem really exists. The exterior walls of a total of 96 homes in Portland, Oregon were opened, of which 70 had retrofitted insulation and 26 were uninsulated and were a control group. The types o… more
Date: May 1, 1980
Creator: Tsongas, G.A.
Partner: UNT Libraries Government Documents Department
open access

Response of El Centro Steam Plant equipment during the October 15, 1979 Imperial Valley earthquake

Description: For the US Nuclear Regulatory Commission (NRC), Lawrence Livermore National Laboratory (LLNL) performed a dynamic seismic analysis of Unit 4 of the El Centro Steam Plant in El Centro, Calif. Built in 1968, Unit 4 is an oil- or gas-fired, steam-driven turbine-generator that was designed to resist a static lateral force equivalent to 20% of the dead and live load. The unit's structural and mechanical systems sustained only minor damage during the October 15, 1979 Imperial Valley earthquake that p… more
Date: September 1, 1980
Creator: Nelson, T. A.; Murray, R. C.; Young, J. A.; Campbell, R. D.; Martore, J. A.; Levin, H. A. et al.
Partner: UNT Libraries Government Documents Department
open access

Reentry thermal testing of a general purpose heat source fueled clad

Description: A General Purpose Heat Source (GPHS) module was exposed to heat treatments simulating an isothermal prelaunch condition, followed by thermal pulses corresponding to atmospheric reentry. Helium release rates were determined during each heating and modeled after simple diffusion theory. Following the tests, the module was examined metallurgically with no evidence of swelling of the cladding nor degradation of the fuel.
Date: March 1, 1982
Creator: Peterson, D. E. & Frantz, C. E.
Partner: UNT Libraries Government Documents Department
open access

Critical CRBR core pressure

Description: The conditions are detailed under which gas pressure will cause or initiate failure in the structural containment of the fuel core. The Clinch River Breeder Reactor Plant is the prototype structure. Two general classes of problems have been studied, representing two entirely distinct configurations of containment failure. The first model determines the minimum pressure to lift a portion or the entire core from its containment. The second model estimates the critical pressure above which the fue… more
Date: June 1, 1980
Creator: Ju, F.D.
Partner: UNT Libraries Government Documents Department
open access

Failure of latch mechanism for motion control of safety rods

Description: During safety rod tests in K-reactor prior to startup, one safety rod could not be lifted because the button'' broke off and became lodged in the mechanism. Examination of the failed latch assembly along with other assemblies from both K-Area and L-Area revealed several missing buttons as well as severely deformed jaw hanger extensions.'' We participated in the investigation of the damage by request of the Reactor Restart Section. Based on our study of the latch mechanism, the modifications to … more
Date: January 16, 1992
Creator: Yau, W. W. F. & Leader, D. R.
Partner: UNT Libraries Government Documents Department
open access

Stress relaxation and hillock growth in thin films

Description: The relaxation of thermal stress in a thin film adhering to a substrate of differing expansion coefficient is discussed. Good agreement is found between literature data on relaxation during isothermal anneals of Pb films at up to 350/sup 0/K and model calculations based on a state variable description of plastic flow. The stress system during relaxation is explored, and the absence of diffusional creep is explained. The plasticity-dominated relaxation process suggested by this analysis is shown… more
Date: January 1, 1978
Creator: Jackson, M. S. & Li, C. Y.
Partner: UNT Libraries Government Documents Department
open access

Army Corps Supplemental Appropriations: Recent History, Trends, and Policy Issues

Description: Report that summarizes recent trends in supplemental funding for the U.S. Army Corps of Engineers, particularly related to natural disasters. It provides summary data and analysis on Corps funding over the last 10 years and includes a general discussion of how the Corps funds emergency actions at its own facilities and elsewhere.
Date: November 29, 2012
Creator: Stern, Charles V. & Carter, Nicole T.
Partner: UNT Libraries Government Documents Department
open access

Detection of damage in structures from changes in their dynamic (modal) properties: a survey

Description: Much of the newly developed technology in vibration measurement, digital signal processing and parameter identification can be utilized for monitoring the integrity of a variety of structural components in nuclear power plants. Although vibration levels in certain key components such as coolant pumps, turbo generators and the reactor core are currently monitored, simple checking of overall vibration levels is often not a sensitive enough indicator of impending failure in a structure. A more sop… more
Date: September 1, 1979
Partner: UNT Libraries Government Documents Department
open access

Thumb tack physical model evaluation of polystyrene bead foam as an encapsulant for electronic packages

Description: A physical model in the shape of a thumb tack is used to measure forces on electronic component lead wires when soldered into printed wiring boards. Encapsulation of electronic packages in polystyrene bead foam of 0.2, 0.3, 0.4, 0.5, and 0.6 g/cm/sup 3/ densities was evaluated. No solder joint damage was seen. Crushing pressures on metal transistors also were safe for all densities. Experimental data agreed well with theoretical calculations based on the concept of constrained thermal expansion. more
Date: March 1, 1980
Creator: Fossey, D. J. & Swanson, G. D.
Partner: UNT Libraries Government Documents Department
open access

Test and evaluate the TRI-GAS Low-Btu Coal Gasification Process. Quarterly report, January-March 1980

Description: New silicon carbide liners were cast for all three reactor vessels. The new liners will facilitate installation of the new reactor heaters and make possible a better seal between the heaters and vessel internals. Globar heating elements were received, cut to length, and installed on the new silicon carbide vessel liners in Stages 2 and 3. The heater for Stage 1 was reassembled on the new silicon carbide liner and installed in the vessel. Preliminary tests were made following the installation of… more
Date: April 1, 1980
Partner: UNT Libraries Government Documents Department
open access

High-speed impact test of an air-transportable plutonium nitrate shipping container

Description: To obtain information on package response for comparison with other test environments, a high-speed impact test was performed on a modified Federal Republic of Germany 18B plutonium nitrate air-transportable container. The container, modified with reinforcing rings for improved crush resistance around the inner tube assembly, was impacted at a velocity of 137 m/s onto an unyielding surface. Substantial crushing of the foam overpack and extensive deformation of the container cavity occurred, cau… more
Date: April 1, 1980
Creator: Yoshimura, H. R.; Pope, R. B.; Leisher, W. B. & Joseph, B. J.
Partner: UNT Libraries Government Documents Department
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