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5,377 Matching Results
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Physics with isotopically controlled semiconductors
Control of the isotopic composition of semiconductors offers a wide range of new scientific opportunities. In this paper a number of recent results obtained with isotopically pure as well as deliberately mixed diamond and Ge bulk single crystals and Ge isotope superlattices will be reviewed. Isotopic composition affects several properties such as phonon energies, bandstructure and lattice constant in subtle but theoretically well understood ways. Large effects are observed for thermal conductivity, local vibrational modes of impurities and after neutron transmutation doping (NTD). Several experiments which could profit greatly from isotope control are proposed.
Date:
August 1, 1994
Creator:
Haller, E. E.
Object Type:
Article
System:
The UNT Digital Library
Computer-controlled radiation monitoring system
A computer-controlled radiation monitoring system was designed and installed at the Lawrence Livermore National Laboratory`s Multiuser Tandem Laboratory (10 MV tandem accelerator from High Voltage Engineering Corporation). The system continuously monitors the photon and neutron radiation environment associated with the facility and automatically suspends accelerator operation if preset radiation levels are exceeded. The system has proved reliable real-time radiation monitoring over the past five years, and has been a valuable tool for maintaining personnel exposure as low as reasonably achievable.
Date:
September 27, 1994
Creator:
Homann, S.G.
Object Type:
Article
System:
The UNT Digital Library
Remotely controlled large container disposal methodology
Remotely Handled Large Containers (RHLC), also called drag-off boxes, have been used at the Hanford Site since the 1940s to dispose of large pieces of radioactively contaminated equipment. These containers are typically large steel-reinforced concrete boxes, which weigh as much as 40 tons. Because large quantities of high-dose waste can produce radiation levels as high as 200 mrem/hour at 200 ft, the containers are remotely handled (either lifted off the railcar by crane or dragged off with a cable). Many of the existing containers do not meet existing structural and safety design criteria and some of the transportation requirements. The drag-off method of pulling the box off the railcar using a cable and a tractor is also not considered a safe operation, especially in view of past mishaps.
Date:
September 1, 1994
Creator:
Amir, S. J.
Object Type:
Report
System:
The UNT Digital Library
International lighting in controlled environments workshop: Proceedings
Lighting is a central and critical aspect of control in environmental research for plant research and is gaining recognition as a significant factor to control carefully for animal and human research. Thus this workshop was convened to reevaluate the technology that is available today and to work toward developing guidelines for the most effective use of lighting in controlled environments with emphasis on lighting for plants but also to initiate interest in the development of improved guidelines for human and animal research. There are a number of established guidelines for lighting in human and animal environments. Development of new lighting guidelines is necessary for three reasons: (1) recent scientific discoveries show that in addition to supporting the sensation of vision, light has profound nonvisual biological and behavioral effects in both animals and humans; (2) federal regulations (EPACT 1992) are requiring all indoor environments to become more energy efficient with a specific emphasis on energy conservation in lighting; (3) lighting engineers and manufacturers have developed a wealth of new light sources and lighting products that can be applied in animal and human environments. The workshop was aimed at bringing together plant scientists and physical scientists to interact in the discussions. It …
Date:
December 31, 1994
Creator:
unknown
Object Type:
Article
System:
The UNT Digital Library
UMTRA project list of reportable occurrences
This UMTRA Project List of Reportable occurrences is provided to facilitate efficient categorization of reportable occurrences. These guidelines have been established in compliance with DOE minimum reporting requirements under DOE Order 5000.3B. Occurrences are arranged into nine groups relating to US Department of Energy (DOE) Uranium Mill Tailings Remedial Action (UMTRA) Project operations for active sites. These nine groupings are provided for reference to determined whether an occurrence meets reporting requirement criteria in accordance with the minimum reporting requirements. Event groups and significance categories that cannot or will not occur, and that do not apply to UMTRA Project operations, are omitted. Occurrence categorization shall be as follows: Group 1. Facility Condition; Group 2. Environmental; Group 3. Personnel Safety; Group 4. Personnel Radiation Protection; Group 5. Safeguards and Security; Group 6. Transportation; Group 7. Value Basis Reporting; Group 8. Facility Status; and Group 9. Cross-Category Items.
Date:
April 1, 1994
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Bases for PUREX deactivation safety equipment list
None
Date:
November 21, 1994
Creator:
Walser, R. L.
Object Type:
Report
System:
The UNT Digital Library
Top ten list of user-hostile interface design
This report describes ten of the most frequent ergonomic problems found in human-computer interfaces (HCIs) associated with complex industrial machines. In contrast with being thought of as ``user friendly,`` many of these machines are seen as exhibiting ``user-hostile`` attributes by the author. The historical lack of consistent application of ergonomic principles in the HCIs has led to a breed of very sophisticated, complex manufacturing equipment that few people can operate without extensive orientation, training, or experience. This design oversight has produced the need for extensive training programs and help documentation, unnecessary machine downtime, and reduced productivity resulting from operator stress and confusion. Ergonomic considerations affect industrial machines in at least three important areas: (1) the physical package including CRT and keyboard, maintenance access areas, and dedicated hardware selection, layout, and labeling; (2) the software by which the user interacts with the computer that controls the equipment; and (3) the supporting documentation.
Date:
October 1, 1994
Creator:
Miller, D. P.
Object Type:
Article
System:
The UNT Digital Library
Environmental assessment for the offsite commercial cleaning of controlled and routine laundry from the Savannah River Site
This Environmental Assessment (EA) has been prepared by the U. S. Department of Energy (DOE) to assess the potential environmental impacts associated with the offsite commercial cleaning of controlled and routine laundry from the Savannah River Site (SRS) near Aiken, South Carolina. Controlled laundry consists of protective clothing and respirator equipment potentially containing radioactive contamination resulting from activities at SRS facilities. Routine laundry includes uncontaminated protective clothing. The aging onsite SRS laundry facility does not comply with current low hazard nuclear facility standards in DOE Order 6430.1. Constructing a new facility on site or upgrading the existing facility have prohibitive costs. The option to seek a commercial offsite vendor was selected as a viable alternative.
Date:
December 1, 1994
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Purex plant safety equipment list for deactivation. Revision 2
This document provides a list of equipment and/or systems essential to the continuing safety of the PUREX facility during DEACTIVATION. The basis for the safety equipment list (SEL) is provided in WHC-SD-RD-022 Rev 1. Equipment selection is based on WHC-CM-1-3, MRP 5.46 as implemented by WHC-CM-4-46, Section 9.0. Format: The safety equipment list is divided into two sections: (1) Process Equipment and (2) Process Instrumentation. Only section (1) is included in this document.
Date:
November 30, 1994
Creator:
Walser, R. L.
Object Type:
Report
System:
The UNT Digital Library
Decision analysis for continuous cover gas monitoring of Ferrocyanide Watch List tanks
This document pertains to underground waste storage tanks at the Hanford Site that have been identified to potentially contain a significant amount of ferrocyanide compounds. This document evaluates the need for continuously monitoring the headspace vapors in Ferrocyanide Watch List tanks to detect flammable gases or gases that could indicate the occurrence of a propagating ferrocyanide-nitrate/nitrite reaction. The results of modeling studies and gas monitoring, and sludge sample analyses of actual ferrocyanide tank wastes have indicated no need to continuously monitor the vapor spaces in ferrocyanide tanks. This conclusion is based in part on the following factors: (1) a study performance on waste aging suggests that the ferrocyanide has degraded in the tanks during the more than 35 years of storage; therefore, the ferrocyanide is not present in concentrations that could support an exothermic reaction, also, the moisture present in the waste is sufficient to preclude a self-sustaining (propagating) ferrocyanide-nitrate reaction; (2) evaluation of core sample results from Tank 241-C-109 and Tank 241-C-112 support laboratory studies showing that ferrocyanide has degraded and the fuel concentration in the tanks is considerably lower than postulated by flowsheet simulants; (3) no gases have been identified that would indicate the occurrence of a ferrocyanide …
Date:
July 1, 1994
Creator:
Fowler, K. D. & Graves, R. D.
Object Type:
Report
System:
The UNT Digital Library
Title list of documents made publicly available. Volume 16, Number 5
The Title List of Documents Made Publicly Available contains descriptions of the information received and generated by the US Nuclear Regulatory Commission (NRC). This information includes (1) docketed material associated with civilian nuclear power plants and other uses of radioactive materials and (2) nondocketed material received and generated by NRC pertinent to its role as a regulatory agency. As used here, docketed does not refer to Court dockets; it refers to the system by which NRC maintains its regulatory records. This series of documents is indexed by a Personal Author Index, a Corporate Source Index, and a Report Number Index.
Date:
July 1, 1994
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Safety evaluation of interim stabilization of non-stabilized single-shell watch list tanks
The report provides a summation of the status of safety issues associated with interim stabilization of Watch List SSTs (organic, ferrocyanide, and flammable gas), as extracted from recent safety analyses, including the Tank Farms Accelerated Safety Analysis efforts.
Date:
December 30, 1994
Creator:
Stahl, S. M.
Object Type:
Report
System:
The UNT Digital Library
Safety evaluation of interim stabilization of non-stabilized single-shell watch list tanks
None
Date:
September 30, 1994
Creator:
Stahl, S. M.
Object Type:
Report
System:
The UNT Digital Library
Safety equipment list for 241-C-106 waste retrieval, Project W-320: Revision 1
The goals of the C-106 sluicing operation are: (1) to stabilize the tank by reducing the heat load in the tank to less than 42 MJ/hr (40,000 Btu/hour), and (2) to initiate demonstration of single-shell tank (SST) retrieval technology. The purpose of this supporting document (SD) is as follows: (1) to provide safety classifications for items (systems, structures, equipment, components, or parts) for the waste retrieval sluicing system (WRSS), and (2) to document and methodology used to develop safety classifications. Appropriate references are made with regard to use of existing systems, structures, equipments, components, and parts for C-106 single-shell transfer tank located in the C Tank Farm, and 241-AY-102 (AY-102) double shell receiver tanks (DST) located in the Aging Waste Facility (AWF). The Waste Retrieval Sluicing System consists of two transfer lines that would connect the two tanks, one to carry the sluiced waste slurry to AY-102, and the other to return the supernatant liquid to C-106. The supernatant, or alternate fluid, will be used to mobilize waste in C-106 for the sluicing process. The equipment necessary for the WRSS include pumps in each tank, sluicers to direct the supernatant stream in C-106, a slurry distributor in AY-102, HVAC for …
Date:
November 15, 1994
Creator:
Conner, J. C.
Object Type:
Report
System:
The UNT Digital Library
Title list of documents made publicly available, December 1--31, 1993, Volume 15, No. 12
The Title List of Documents Made Publicly Available is a monthly publication. It contains descriptions of the information received and generated by the U.S. Nuclear Regulatory Commission (NRC). This information includes (1) docketed material associated with civilian nuclear power plants and other uses of radioactive materials and (2) nondocketed material received and generated by NRC pertinent to its role as a regulatory agency. As used here, docketed does not refer to Court dockets; it refers to the system by which NRC maintains its regulatory records. This series of documents is indexed by a Personal Author Index, a Corporate Source Index, and a Report Number Index.
Date:
February 1, 1994
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Particulate behavior in a controlled-profile pulverized coal-fired reactor: A study of coupled turbulent particle dispersion and thermal radiation transport. Quarterly technical progress report, December 15, 1993--March 14, 1994
During the tenth quarter progress has been made in the following areas: (1) Reduction of experimental data recently collected; (2) particle dispersion and radiation modelling.
Date:
June 1, 1994
Creator:
Queiroz, M. & Webb, B. W.
Object Type:
Report
System:
The UNT Digital Library
Particulate behavior in a controlled-profile pulverized coal-fired reactor: A study of coupled turbulent particle dispersion and thermal radiation transport. Quarterly technical progress report, 15 September, 1993--14 December, 1993
This report describes recent progress in a fundamental, three-year investigation of the coupled problem of turbulent particle dispersion and thermal radiation transport. The project`s objective is to make measurements of particle size, velocity, number density, temperature and wall radiant heat flux in a parametrically-controlled reactor presently existent at Brigham Young University (BYU). Although the study proposed here is primarily designed to provide experimental data not currently available for the evaluation of turbulent particle dispersion and radiation models, comparisons of analytical predictions and the experimental data obtained will be performed, using appropriate submodels integral to comprehensive pulverized-coal combustion codes existent at BYU. Progress has been made in the following areas: (1) reduction of experimental data recently collected; (2) particle dispersion and radiation modeling.
Date:
March 1, 1994
Creator:
Queiroz, M. & Webb, B. W.
Object Type:
Report
System:
The UNT Digital Library
Design considerations for third party inspection activities for storage facilities
Initiatives by the President and the Secretary of available national excess special nuclear for third party inspection and verification required special design requirements to be considered for the reconfigured weapons complex storage facilities. The approach that will be taken in the design and operation will permit controlled access to all nuclear materials and related information that would not disclose or lead to disclosure of classified or proprietary information not obligated by treaty or other agreements. This approach would provide the third party inspectors with the information and capability to access designated materials while minimizing impact upon facility operations. These considerations would also give the federal government the flexibility to add new materials to the excess materials category list in the future. This paper will discuss the safeguards and security design impacts and features that are being anticipated for the storage facilities, both for possible new construction and upgrading existing facilities.
Date:
July 1, 1994
Creator:
Metzler, J. F.; Zack, N. R.; Hunteman, W. J. & Jaeger, C. D.
Object Type:
Article
System:
The UNT Digital Library
Grading standards, prepared by the Configuration Management Office
This report describes the grading methodology used by the organization to determine the required levels of configuration management for all controlled elements that are part of the nuclear facility and its operation. The goal is to have a flexible grading system that accurately reflects the overall operational environment. The grading methodology should identify which items, processes, and information should be incorporated into facility baselines as controlled elements; and specify the level of formality that should be applied to activities that employ or impact these controlled elements. Evaluation categories include the following: radiological damage to workers; toxicological damage to workers; industrial safety; environmental damage; property damage; facility availability; cost effect; reputation; and commitments.
Date:
January 28, 1994
Creator:
Cort, G.; Donahue, S.; Frank, J.; Perkins, B. & Wrye, J.
Object Type:
Report
System:
The UNT Digital Library
Calculations supporting evaluation of potential environmental standards for Yucca Mountain
The Energy Policy Act of 1992, Section 801 (US Congress, 1992) provides for the US Environmental Protection Agency (EPA) to contract the National Academy of Sciences (NAS) to conduct a study and provide findings and recommendations on reasonable standards for the disposal of high-level wastes at the Yucca Mountain site. The NAS study is to provide findings and recommendations which include, among other things, whether a health-based standard based on dose to individual members of the public from releases to the accessible environment will provide a reasonable standard for the protection of the health and safety of the public. The EPA, based upon and consistent with the findings and recommendations of the NAS, is required to promulgate standards for protection of the public from releases from radioactive materials stored or disposed of in a repository at the Yucca Mountain site. This document presents a number of different ``simple`` analyses of undisturbed repository performance that are intended to provide input to those responsible for setting appropriate environmental standards for a potential repository at the Yucca Mountain site in Nevada. Each of the processes included in the analyses has been simplified to capture the primary significance of that process in containing or …
Date:
April 1, 1994
Creator:
Duguid, J. O.; Andrews, R. W.; Brandstetter, E.; Dale, T. F. & Reeves, M.
Object Type:
Report
System:
The UNT Digital Library
Closure of a unique mixed waste storage canal at the Dept. of Energy`s Oak Ridge National Laboratory (ORNL)
At the Department of Energy`s (DOE`s) Oak Ridge National Laboratory (ORNL) a unique closure was accomplished for a storage canal that contained both hazardous chemical contaminants controlled by the Resource Conservation and Recovery Act (RCRA), and radioactive contaminants controlled by the Atomic Energy Act (AEA). During 1991 and 1992, after approvals were received from the DOE and the Tennessee Department of Environment and Conservation (TDEC), subcontractors to DOE`s Construction Manager were mobilized and remote controlled equipment was operated on site to remove the RCRA and radioactive contamination (referred to hereafter as mixed wastes) from the 3001 Storage Canal at ORNL. After numerous {open_quotes}surprises{close_quotes} during the removal activities, each requiring problem resolution and approvals from DOE and TDEC, the canal closure was completed in September 1992 and final closure certification was submitted to TDEC in October 1992. The following discussion describes the learning experiences that ORNL and DOE acquired from a RCRA closure project for a mixed waste storage canal containing high radiation levels. The project was successful, especially since worker exposures were minimized, but was lengthy, requiring 30 months from notification of a leak in the canal until final demobilization of the subcontractor, and expensive to complete (total overall cost …
Date:
September 1, 1994
Creator:
Greer, J. K. Jr.; Etheridge, J. T. & Thompson, W. T.
Object Type:
Article
System:
The UNT Digital Library
Experimental, theoretical, and computational studies of the plasma beat wave accelerator concept. Final report, May 1, 1989--June 30, 1994
As can be seen this was an extremely productive period with the PI and his team completing all the tasks in the original proposal. The following six pages list the work statement as it appeared in the initial proposal. Next to it is a summary of what the actual performance was. A check mark means the accomplishment was exactly as planned in the work statement. A list of key publications under each main subtask in the work statement are also listed.
Date:
December 31, 1994
Creator:
Joshi, C.
Object Type:
Report
System:
The UNT Digital Library
Department of Energy Programmatic Spent Nuclear Fuel Management and Idaho National Engineering Laboratory Environmental Restoration and Waste Management Programs Draft Environmental Impact Statement; Volume 1, Appendix F, Nevada Test Site and Oak Ridge Reservation Spent Nuclear Fuel Management Programs
This volume addresses the interim storage of spent nuclear fuel (SNF) at two US Department of Energy sites, the Nevada Test Site (NTS) and the Oak Ridge Reservation (ORR). These sites are being considered to provide a reasonable range of alternative settings at which future SNF management activities could be conducted. These locations are not currently involved in management of large quantities of SNF; NTS has none, and ORR has only small quantities. But NTS and ORR do offer experience and infrastructure for the handling, processing and storage of radioactive materials, and they do exemplify a broad spectrum of environmental parameters. This broad spectrum of environmental parameters will provide, a perspective on whether and how such location attributes may relate to potential environmental impacts. Consideration of these two sites will permit a programmatic decision to be based upon an assessment of the feasible options without bias, to the current storage sites. This volume is divided into four parts. Part One is the volume introduction. Part Two contains chapters one through five for the NTS, as well as references contained in chapter six. Part Three contains chapters one through five for the ORR, as well as references contained in chapter six. …
Date:
June 1, 1994
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Progress toward mitigation of flammable gas Tank 241-SY-101
The mixing pump installed in Hanford Site tank 241-SY-101 has been shown to be effective in releasing flammable gases in a controlled manner. This controlled release of gas prevents the accumulation and episodic release above flammable limits. More work needs to be done to optimize the pumping operation, and to evaluate the long-term effects of mixing so as to assure that no undesirable changes have occurred to the waste. Other alternative mitigation concepts are still being evaluated as a backup to mixing.
Date:
January 1, 1994
Creator:
Lentsch, J. W.; Babad, H.; Hanson, C. E. & Kirch, N. W.
Object Type:
Article
System:
The UNT Digital Library