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Advanced Test Reactor Probabilistic Risk Assessment Methodology and Results Summary
The Advanced Test Reactor (ATR) probabilistic risk assessment (PRA) Level 1 report documents a comprehensive and state-of-the-art study to establish and reduce the risk associated with operation of the ATR, expressed as a mean frequency of fuel damage. The ATR Level 1 PRA effort is unique and outstanding because of its consistent and state-of-the-art treatment of all facets of the risk study, its comprehensive and cost-effective risk reduction effort while the risk baseline was being established, and its thorough and comprehensive documentation. The PRA includes many improvements to the state-of-the-art, including the following: establishment of a comprehensive generic data base for component failures, treatment of initiating event frequencies given significant plant improvements in recent years, performance of efficient identification and screening of fire and flood events using code-assisted vital area analysis, identification and treatment of significant seismic-fire-flood-wind interactions, and modeling of large loss-of-coolant accidents (LOCAs) and experiment loop ruptures leading to direct damage of the ATR core. 18 refs.
Date:
January 1, 1992
Creator:
Eide, S. A.; Atkinson, S. A. & Thatcher, T. A.
Object Type:
Report
System:
The UNT Digital Library
Advanced Test Reactor probabilistic risk assessment methodology and results summary
The Advanced Test Reactor (ATR) probabilistic risk assessment (PRA) Level 1 report documents a comprehensive and state-of-the-art study to establish and reduce the risk associated with operation of the ATR, expressed as a mean frequency of fuel damage. The ATR Level 1 PRA effort is unique and outstanding because of its consistent and state-of-the-art treatment of all facets of the risk study, its comprehensive and cost-effective risk reduction effort while the risk baseline was being established, and its thorough and comprehensive documentation. The PRA includes many improvements to the state-of-the-art, including the following: establishment of a comprehensive generic data base for component failures, treatment of initiating event frequencies given significant plant improvements in recent years, performance of efficient identification and screening of fire and flood events using code-assisted vital area analysis, identification and treatment of significant seismic-fire-flood-wind interactions, and modeling of large loss-of-coolant accidents (LOCAs) and experiment loop ruptures leading to direct damage of the ATR core. 18 refs.
Date:
January 1, 1992
Creator:
Eide, S. A.; Atkinson, S. A. & Thatcher, T. A.
Object Type:
Report
System:
The UNT Digital Library
Advanced Turbine Design Program
The prime objective of this project task is to select a natural gas fired as Advanced Turbine Systems (ATS) capable of reaching 60% cycle efficiency. Several cycles were compared and evaluated under all different kind of aspects, to determine the one with the highest potential and, at the same time, the best overall fit within and experience base to guarantee project goals. The combined cycle with multistep development potential was identified as the system to reach the 60% or greater thermal efficiency.
Date:
January 1, 1992
Creator:
van der Linden, S.; Gnaedig, G. & Kreitmeier, F.
Object Type:
Article
System:
The UNT Digital Library
Advanced turbine systems program
In accordance with the goals of the DOE program, improvements in the gas turbine are the primary focus of Allison activity during Phase I. To this end Allison conducted a survey of potentially applicable gas turbine cycles and selected the advanced combined cycle as reference system. Extensive analysis of two versions of the advanced combined cycle was performed against the requirement for a 60% thermal efficiency (LHV) utility-sized, natural gas fired system. This analysis resulted in technology requirements for this system. Additional analysis determined emissions potential for the system, established a coal-fueled derivative system and a commercialization plan. This report deals with the technical requirements for a system that meets the thermal efficiency goal. Allison initially investigated four basic thermodynamic cycles: Humid air turbine, intercalate-recuperated systems, advanced combined cycle, chemically recuperated cycle. Our survey and cycle analysis indicated that au had the potential of reaching 60% thermal efficiency. We also concluded that engine hot section technology would be a critical technology regardless of which cycle was chosen. Based on this result Allison chose to concentrate on the advanced combined cycle. This cycle is well known and understood by the utility turbine user community and is therefore likely to be acceptable …
Date:
January 1, 1992
Creator:
Wilkes, C.; Mukavetz, D. W.; Knickerbocker, T. K. & Ali, S. A.
Object Type:
Article
System:
The UNT Digital Library
Advanced water-cooled phosphoric acid fuel cell development
Post-test analyses of 10-ft[sup 2] short stack components continue. Component strength and acid transfer measurement were completed. A decision was made to proceed with the final small area short stack test.
Date:
January 1, 1992
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Advanced water-cooled phosphoric acid fuel cell development
The final task of the program addressed the testing of the three short stacks described above. The overall objective of this series of short stack tests was to verify the operation of the advanced cell design at both on-site and electric utility operating conditions. The small area development stack was operated first at atmosphenc pressure (to compare its characteristics to previous atmospheric tests) and then at 120 psia to examine its ability to operate at electric utility conditions. The 10-ft{sup 2} stack was also run at pressurized conditions to verify the scaling characteristics of the features developed in this program . The small area development stack was assembled and successfully tested for 3050 hours. The first 2380 hours of testing was conducted at atmospheric pressure, and the final 670 hours was at 120 psia pressurized conditions. As shown in Figure 1, performance was stable throughout testing. Intermediate and post test inspections of the stack showed parts to be in generally good condition with no anomalies.
Date:
January 1, 1992
Creator:
Scheffler, G. W. & Kemp, F. S.
Object Type:
Article
System:
The UNT Digital Library
Advanced water-cooled phosphoric acid fuel cell development. Monthly technical progress report No. 44, October--December, 1991
Post-test analyses of 10-ft{sup 2} short stack components continue. Component strength and acid transfer measurement were completed. A decision was made to proceed with the final small area short stack test.
Date:
January 1, 1992
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Advances in compressible turbulent mixing
This volume includes some recent additions to original material prepared for the Princeton International Workshop on the Physics of Compressible Turbulent Mixing, held in 1988. Workshop participants were asked to emphasize the physics of the compressible mixing process rather than measurement techniques or computational methods. Actual experimental results and their meaning were given precedence over discussions of new diagnostic developments. Theoretical interpretations and understanding were stressed rather than the exposition of new analytical model developments or advances in numerical procedures. By design, compressibility influences on turbulent mixing were discussed--almost exclusively--from the perspective of supersonic flow field studies. The papers are arranged in three topical categories: Foundations, Vortical Domination, and Strongly Coupled Compressibility. The Foundations category is a collection of seminal studies that connect current study in compressible turbulent mixing with compressible, high-speed turbulent flow research that almost vanished about two decades ago. A number of contributions are included on flow instability initiation, evolution, and transition between the states of unstable flow onset through those descriptive of fully developed turbulence. The Vortical Domination category includes theoretical and experimental studies of coherent structures, vortex pairing, vortex-dynamics-influenced pressure focusing. In the Strongly Coupled Compressibility category the organizers included the high-speed turbulent flow investigations …
Date:
January 1, 1992
Creator:
Dannevik, W. P.; Buckingham, A. C. & Leith, C. E.
Object Type:
Article
System:
The UNT Digital Library
Adventus
Access:
Use of this item is restricted to the UNT Community
Recording of Milan Slavicky's Adventus. The main source of inspiration for this composition was a Czech liturgical tune from Renaissance times which used to be sung during Advent. Its unusual melodic form and great poetic quality inspired a bow-formed composition which uses mostly different vocal phrases of this song, an imitation of an organ sound and finally a tower bell transposed into lower and lower register.
Date:
1992
Creator:
Slavický, Milan, 1947-2009
Object Type:
Sound
System:
The UNT Digital Library
[Advertisement: Save the D.C. health benefits act]
Advertisement appealing for support of the D.C. health benefits act that extends benefits to the domestic partners of city workers.
Date:
1992
Creator:
National Gay and Lesbian Task Force (U.S.)
Object Type:
Clipping
System:
The UNT Digital Library
The Aerie, Yearbook of the University of North Texas, 1992
Yearbook for University of North Texas in Denton, Texas includes photos of and information about the school, student body, professors, and organizations. Index starts on page 244.
Date:
1992
Creator:
University of North Texas
Object Type:
Yearbook
System:
The Portal to Texas History
[Aeriel photo of Chinton Hall, Music Practice North, the Music Building, and the Health Center]
Aerial photograph of Chilton Hall, the structure in the center of this image. The structure below it is Music Practice North (originally built as a men’s dorm known as the Quadrangle). The Music Building is to the right and the Health Center is above Chilton Hall, circa 1992.
Date:
1992~
Creator:
unknown
Object Type:
Photograph
System:
The UNT Digital Library
Aerosol penetration through a seismically loaded shear wall
An experimental study was performed to measure the aerosol penetration through a reinforced concrete shear wall after simulated seismic damage. Static load-cycle testing, to stress levels sufficient to induce visible shear cracking, was used to simulate the earthquake loading. Air permeability tests were performed both before and after the simulated seismic loading damaged the structure. Aerosol penetration measurements were conducted on the cracked shear wall structure using 0.10 {mu}m monodisperse particles. The measured aerosol number penetration through the cracked shear wall was 0.5%. 7 refs.
Date:
January 1, 1992
Creator:
Farrar, C. R. & Girrens, S. P.
Object Type:
Article
System:
The UNT Digital Library
Aerosols released during large-scale integral MCCI tests in the ACE Program
As part of the internationally sponsored Advanced Containment Experiments (ACE) program, seven large-scale experiments on molten core concrete interactions (MCCIs) have been performed at Argonne National Laboratory. One of the objectives of these experiments is to collect and characterize all the aerosols released from the MCCIs. Aerosols released from experiments using four types of concrete (siliceous, limestone/common sand, serpentine, and limestone/limestone) and a range of metal oxidation for both BWR and PWR reactor core material have been collected and characterized. Release fractions were determined for UO{sup 2}, Zr, the fission-products: BaO, SrO, La{sub 2}O{sub 3}, CeO{sub 2}, MoO{sub 2}, Te, Ru, and control materials: Ag, In, and B{sub 4}C. Release fractions of UO{sub 2} and the fission products other than Te were small in all tests. However, release of control materials was significant.
Date:
January 1, 1992
Creator:
Fink, J. K.; Thompson, D. H.; Spencer, B. W. & Sehgal, B. R.
Object Type:
Article
System:
The UNT Digital Library
AFBC co-firing of coal and hospital wastes
During the previous report period, shredder system verification and testing was initiated at DONLEE's pilot facility located in York, Pennsylvania. General waste from the Lebanon VA Medical Center was transported to the pilot facility in York. The waste was fed into the unit starting December 18, 1991. The waste feed rate was adjusted to approximately 150 lb./hr. The stack monitoring portion of the shredder testing was conducted on January 28 and 29. The heat input was approximately 6 [times] l0[sup 6] BTU/hr. both days. On the first day, only coal and limestone were fed into the unit. On the second day, hospital waste, coal, and limestone were fed into the unit. On both days of testing, data included: coal, limestone, and ash samples and flow rates; all air flows; stack flue gas flow; combustor, cyclone, boiler, and baghouse; temperatures and pressures; stack concentration of dioxins and furans; stack concentration of heavy metals; stack concentration of HCI; stack concentration of PAH. The hospital waste feed during the second test was approximately 150 lb./hr. The PA DER requested that the final design of the Lebanon facility fire anthracite coal only. On February 4, the unit was lit off on anthracite coal. Operation …
Date:
January 1, 1992
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Africa Explores: 20th Century African Art [Exhibition Photographs]
Photographs of the exhibition "Africa Explores: 20th Century African Art," February 9-April 5, 1992, held at the Dallas Museum of Art. Photographs documenting this exhibition include twenty-three gallery installation and exterior signage views.
Date:
1992
Creator:
Dallas Museum of Art
Object Type:
Collection
System:
The Portal to Texas History
Africa Explores: 20th Century African Art [Photograph DMA_1468-01]
Photograph of the exhibition "Africa Explores: 20th Century African Art," February 9-April 5, 1992, held at the Dallas Museum of Art: exterior signage.
Date:
1992
Creator:
Dallas Museum of Art
Object Type:
Photograph
System:
The Portal to Texas History
Africa Explores: 20th Century African Art [Photograph DMA_1468-02]
Photograph of the exhibition "Africa Explores: 20th Century African Art," February 9-April 5, 1992, held at the Dallas Museum of Art.
Date:
1992
Creator:
Dallas Museum of Art
Object Type:
Photograph
System:
The Portal to Texas History
Africa Explores: 20th Century African Art [Photograph DMA_1468-03]
Photograph of the exhibition "Africa Explores: 20th Century African Art," February 9-April 5, 1992, held at the Dallas Museum of Art.
Date:
1992
Creator:
Dallas Museum of Art
Object Type:
Photograph
System:
The Portal to Texas History
Africa Explores: 20th Century African Art [Photograph DMA_1468-04]
Photograph of the exhibition "Africa Explores: 20th Century African Art," February 9-April 5, 1992, held at the Dallas Museum of Art.
Date:
1992
Creator:
Dallas Museum of Art
Object Type:
Photograph
System:
The Portal to Texas History
Africa Explores: 20th Century African Art [Photograph DMA_1468-05]
Photograph of the exhibition "Africa Explores: 20th Century African Art," February 9-April 5, 1992, held at the Dallas Museum of Art.
Date:
1992
Creator:
Dallas Museum of Art
Object Type:
Photograph
System:
The Portal to Texas History
Africa Explores: 20th Century African Art [Photograph DMA_1468-06]
Photograph of the exhibition "Africa Explores: 20th Century African Art," February 9-April 5, 1992, held at the Dallas Museum of Art.
Date:
1992
Creator:
Dallas Museum of Art
Object Type:
Photograph
System:
The Portal to Texas History
Africa Explores: 20th Century African Art [Photograph DMA_1468-07]
Photograph of the exhibition "Africa Explores: 20th Century African Art," February 9-April 5, 1992, held at the Dallas Museum of Art.
Date:
1992
Creator:
Dallas Museum of Art
Object Type:
Photograph
System:
The Portal to Texas History
Africa Explores: 20th Century African Art [Photograph DMA_1468-08]
Photograph of the exhibition "Africa Explores: 20th Century African Art," February 9-April 5, 1992, held at the Dallas Museum of Art.
Date:
1992
Creator:
Dallas Museum of Art
Object Type:
Photograph
System:
The Portal to Texas History