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15,324 Matching Results
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Welding irradiated stainless steel
Conventional welding processes produced severe underbead cracking in irradiated stainless steel containing 1 to 33 appm helium from n,a reactions. A shallow penetration overlay technique was successfully demonstrated for welding irradiated stainless steel. The technique was applied to irradiated 304 stainless steel that contained 10 appm helium. Surface cracking, present in conventional welds made on the same steel at the same and lower helium concentrations, was eliminated. Underbead cracking was minimal compared to conventional welding methods. However, cracking in the irradiated material was greater than in tritium charged and aged material at the same helium concentrations. The overlay technique provides a potential method for repair or modification of irradiated reactor materials.
Date:
December 31, 1993
Creator:
Kanne, W. R., Jr.; Chandler, G. T.; Nelson, D. Z. & Franco-Ferreira, E. A.
Object Type:
Article
System:
The UNT Digital Library
Western Research Institute quarterly technical progress report, July--September 1993
Accomplishments for the quarter are described briefly for the following areas of research: oil shale; tar sand; coal; advanced exploratory process technology; and jointly sponsored research. Oil shale research covers process studies. Tar sand research is on recycle oil pyrolysis and extraction (ROPE{sup TM}) Process. Coal research includes: coal combustion; integrated coal processing concepts; and solid waste management. Advanced exploratory process technology includes: advanced process concepts; advanced mitigation concepts; and oil and gas technology. Jointly sponsored research covers: CROW{sup TM} field demonstration with Bell Lumber and Pole; operation and evaluation of the CO{sub 2} HUFF-N-PUFF Process; fly ash binder for unsurfaced road aggregates; solid state NMR analysis of Mesaverde group, Greater Green River Basin, tight gas sands; characterization of petroleum residua; shallow oil production using horizontal wells with enhanced oil recovery techniques; surface process study for oil recovery using a thermal extraction process; oil field waste cleanup using tank bottom recovery process; remote chemical sensor development; in situ treatment of manufactured gas plant contaminated soils demonstration program; solid state NMR analysis of Mowry formation shale from different sedimentary basins; solid state NMR analysis of naturally and artificially matured kerogens; and development of an effective method for the clean-up of natural …
Date:
December 31, 1993
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Wetting phase permeability in a partially saturated horizontal fracture
A major obstacle to understanding of unsaturated fracture flow is the paucity of physical data on both fracture aperture structure and the effects of phase structure on permeability. An experimental procedure is developed for collecting detailed data on aperture and phase structure from a transparent analog fracture. Stable phase structures of varying complexity are creating within the horizontal analog fracture. Wetting phase permeability is measured under steady-state conditions. A process based model for wetting phase relative permeability is explored. Average distribution of the wetting phase is shown to provide insufficient information for modeling relative permeability; descriptive models must account for spatial structure of the phases.
Date:
December 31, 1993
Creator:
Nicholl, M. J. & Glass, R. J.
Object Type:
Article
System:
The UNT Digital Library
Workshop and conference on Grand Challenges applications and software technology
On May 4--7, 1993, nine federal agencies sponsored a four-day meeting on Grand Challenge applications and software technology. The objective was to bring High-Performance Computing and Communications (HPCC) Grand Challenge applications research groups supported under the federal HPCC program together with HPCC software technologists to: discuss multidisciplinary computational science research issues and approaches, identify major technology challenges facing users and providers, and refine software technology requirements for Grand Challenge applications research. The first day and a half focused on applications. Presentations were given by speakers from universities, national laboratories, and government agencies actively involved in Grand Challenge research. Five areas of research were covered: environmental and earth sciences; computational physics; computational biology, chemistry, and materials sciences; computational fluid and plasma dynamics; and applications of artificial intelligence. The next day and a half was spent in working groups in which the applications researchers were joined by software technologists. Nine breakout sessions took place: I/0, Data, and File Systems; Parallel Programming Paradigms; Performance Characterization and Evaluation of Massively Parallel Processing Applications; Program Development Tools; Building Multidisciplinary Applications; Algorithm and Libraries I; Algorithms and Libraries II; Graphics and Visualization; and National HPCC Infrastructure.
Date:
December 31, 1993
Creator:
unknown
Object Type:
Article
System:
The UNT Digital Library
Workshop on advances in smooth particle hydrodynamics
This proceedings contains viewgraphs presented at the 1993 workshop held at Los Alamos National Laboratory. Discussed topics include: negative stress, reactive flow calculations, interface problems, boundaries and interfaces, energy conservation in viscous flows, linked penetration calculations, stability and consistency of the SPH method, instabilities, wall heating and conservative smoothing, tensors, tidal disruption of stars, breaking the 10,000,000 particle limit, modelling relativistic collapse, SPH without H, relativistic KSPH avoidance of velocity based kernels, tidal compression and disruption of stars near a supermassive rotation black hole, and finally relativistic SPH viscosity and energy.
Date:
December 31, 1993
Creator:
Wingate, C. A. & Miller, W. A.
Object Type:
Report
System:
The UNT Digital Library
Workshop on measurement quality assurance for ionizing radiation: Proceedings
This workshop was held to review the status of secondary level calibration accreditation programs, review related measurement accreditation programs, document lessons learned, and to present changes in programs due to new national priorities involving radioactivity measurements. Contents include: fundamentals of measurement quality assurance (MQA), standards for MQA programs; perspectives and policies; complete MQA programs; future MQA programs; QA/QC programs--radioactivity; QA/QC programs--dosimetry; laboratory procedures for QA/QC; in-house control of reference dosimetry laboratories; in-house controls of radioactivity laboratories; and poster session. Selected papers are indexed separately for inclusion in the Energy Science and Technology Database.
Date:
December 31, 1993
Creator:
Heath, J. A. & Swinth, K. L.
Object Type:
Article
System:
The UNT Digital Library
WRAP 2A Waste Form Qualification Plan
WRAP Module 2A is a facility that will serve to treat retrieved, stored, and newly generated contact-handled mixed low level waste (MLLW) at the Department of Energy`s Hanford site near Richland, Washington. The treatment processes to be used are limited to non-thermal processes, defined as processes operating at a temperature less than 500{degree}F. In addition to waste pretreatment and conditioning processes including sorting, size reduction, and homogenization, the final treatment technologies will consist of immobilization, stabilization, and encapsulation to produce final waste forms that are suitable for disposal in compliance with all applicable regulatory requirements. The wide variety of chemical and physical characteristics exhibited by the WRAP 2A feed streams will necessitate the performance of a comprehensive waste form qualification (WFQ) testing program. The WFQ program will provide the technical basis supporting the process selection and will demonstrate that the selected treatment processes produce final waste forms that will meet all applicable regulatory requirements and performance specifications. This document describes the overall WRAP 2A WFQ program.
Date:
December 31, 1993
Creator:
Burbank, D. A. Jr.
Object Type:
Report
System:
The UNT Digital Library
X-ray production with sub-picosecond laser pulses
The interaction of intense, sub-picosecond laser pulses with solid targets produces intense picosecond x-ray pulses. With focused laser pulses of several 10 {sup 18} W/cm{sup 2}, He-like and H-like line radiation from targets such as aluminum and silicon has been produced. The energy conversion efficiency from the laser pulse energy to the 1--2 keV line x-rays is nearly one percent. The duration of the line x-ray radiation is of the order of ten picoseconds, although this may be an upper estimate because of the temporal resolution of the x-ray streak camera. The spatial extent of the x-ray source region is only slightly larger than the laser focal spot, or about 10 {mu}m in diameter. With these characteristics, such x-ray sources emit an intensity of nearly 10{sup 14} W/cm{sup 2}. Experiments and modeling which led to the above conclusions will be discussed.
Date:
December 31, 1993
Creator:
Schappert, G. T.; Cobble, J. A.; Fulton, R. D. & Kyrala, G. A.
Object Type:
Article
System:
The UNT Digital Library
Y-12 development organization technical progress report period ending December 1, 1993. Part 3, Metal processing
Rheocasting is a method to eliminate skull and arc melting from the uranium-6% niobium alloy production stream. A U-6Nb ingot was melted and stirred in the rheocasting furnace.
Date:
December 31, 1993
Creator:
Northcutt, W. G. Jr.
Object Type:
Report
System:
The UNT Digital Library
The yield of F-18 from different target designs in the {sup 18}O(p,n){sup 18}F reaction on frozen [{sup 18}O]CO{sub 2}
The shortage of oxygen-18 enriched water has encouraged the authors to explore alternate methods of production of fluorine-18 where the recovery of the oxygen-18 enriched target material is extremely efficient. They have recently presented the results from a cryogenic target using carbon dioxide ice as the target. This is similar in design to a water ice target previously described. The amount of material required and the maximum beam current which can be put on the target are a function of the particular design. The effects of target cone length and number of cooling fins have been explored in order to optimize the target design. Three different targets have been used to test these parameters. The three targets are shown. The first was the prototype target with a single heat sink at the rear of the target. The second is a target with several cooling fins and a short cone length which requires less target material. The third is a target with several cooling fins but a longer target length which allows for more efficient cooling of the material. The results from these studies are summarized. This cryogenic target gives extremely efficient enriched target material recovery (>99%) and simplicity of material …
Date:
December 31, 1993
Creator:
Firouzbakht, M. L.; Schlyer, D. J. & Wolf, A. P.
Object Type:
Report
System:
The UNT Digital Library
Yucca Mountain Site Characterization Project Technical Data Catalog (Quarterly supplement)
The March 21, 1993, Department of Energy (DOE)/Nuclear Regulatory Commission (NRC) Site-Specific Procedural Agreement for Geologic Repository Site Investigation and Characterization Program requires the DOE to develop and maintain a catalog of data which will be updated and provided to the NRC at least quarterly. This catalog is to include a description of the data; the time (date), place, and method of acquisition; and where it may be examined. The Yucca Mountain Site Characterization Project (YMP) Technical Data Catalog is published and distributed in accordance with the requirements of the Site-Specific Agreement. The YMP Technical Data Catalog is a report based on reference information contained in the YMP Automated Technical Data Tracking System (ATDT). The reference information is provided by Participants for data acquired or developed in support of the YMP. The Technical Data Catalog is updated quarterly and published in the month following the end of each quarter. A complete revision to the Catalog is published at the end of each fiscal year. Supplements to the end-of-year edition are published each quarter. These supplements provide information related to new data items not included in previous quarterly updates and data items affected by changes to previously published reference information. The …
Date:
December 31, 1993
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
The zinc electrode: Reactions and mechanisms
The zinc electrode in alkaline electrolyte is unusual in that supersaturated zincate solutions can form during discharge and spongy or mossy zinc deposits can form on charge at low overvoltages. This paper reports on in situ x-ray absorption (XAS) results on supersaturated zincate and on mossy deposits.
Date:
December 31, 1993
Creator:
McBreen, J.
Object Type:
Article
System:
The UNT Digital Library