Degree Discipline
Degree Level
Country
States
Decade
Year
Month
Language
318,998 Matching Results
Results open in a new window/tab.
prev
Results:
318,985 - 318,998 of
318,998
Air Pathway Report: Phase I of the Hanford Environmental Dose Reconstruction Project
Phase 1 of the air-pathway portion of the Hanford Environmental Dose Reconstruction (HEDR) Project sought to determine whether dose estimates could be calculated for populations in the 10 counties nearest the Hanford Site from atmospheric releases of iodine-131 from the site from 1944--1947. Phase 1 demonstrated the following: HEDR-calculated source-term estimates of iodine-131 releases to the atmosphere were within 20% of previously published estimates; calculated vegetation concentrations of iodine-131 agree well with previously published measurements; the highest of the Phase 1 preliminary dose estimates to the thyroid are consistent with independent, previously published estimates of doses to maximally exposed individuals; and, relatively crude, previously published measurements of thyroid burdens for Hanford workers are in the range of average burdens that the HEDR model estimated for similar reference individuals for the period 1944--1947. Preliminary median dose estimates summed over the year 1945--1947 for the primary pathway, air-pasture-cow-milk-thyroid, ranged from low median values of 0.006 rad for upwind adults who obtained milk from backyard cows not on pasture to high median values of 68.0 rad for downwind infants who drank milk from pasture-fed cows. Extremes of the estimated range are a low of essentially zero to upwind adults and a high of …
Date:
July 1, 1991
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Attenuation of Airborne Debris From LMFBR Accidents
Experimental and theoretical studies have been performed to characterize the behavior of airborne particulates (aerosols) expected to be produced by hypothetical core disassembly accidents (HCDA's) in liquid metal fast breeder reactors (LMFBR's). These aerosol studies include work on aerosol transport in a 20-m high, 850-m/sup 3/ closed vessel at moderate concentrations; aerosol transport in a small vessel under conditions of high concentration (approx. 1000 g/m/sup 3/), high turbulence, and high temperature (approx. 2000/sup 0/C); and aerosol transport through various leak paths. These studies have shown that little, if any, airborne debris from LMFBR HCDA's would reach the atmosphere exterior to an intact reactor containment building.
Date:
January 1, 1978
Creator:
Morewitz, H. A.; Johnson, R. P.; Nelson, C. T.; Vaughan, E. U.; Guderjahn, C. A.; Hilliard, R. K. et al.
Object Type:
Article
System:
The UNT Digital Library
Benchmark Critical Experiments on Low-Enriched Uranium Oxide Systems With H/U = 0. 77
Ten benchmark experiments were performed at the Critical Mass Laboratory at Rockwell International'1s Rocky Flats Plant, Golden, Colorado, for the US Nuclear Regulatory Commission. They provide accurate criticality data for low-enriched damp uranium oxide (U/sub 3/O/sub 8/) systems. The core studied consisted of 152 mm cubical aluminum cans containing an average of 15,129 g of low-enriched (4.46% /sup 235/U) uranium oxide compacted to a density of 4.68 g/cm/sup 3/ and with an H/U atomic ratio of 0.77. One hundred twenty five (125) of these cans were arranged in an approx. 770 mm cubical array. Since the oxide alone cannot be made critical in an array of this size, an enriched (approx. 93% /sup 235/U) metal or solution driver was used to achieve criticality. Measurements are reported for systems having the least practical reflection and for systems reflected by approx. 254-mm-thick concrete or plastic. Under the three reflection conditions, the mass of the uranium metal driver ranged from 29.87 kg to 33.54 kg for an oxide core of 1864.6 kg. For an oxide core of 1824.9 kg, the weight of the high concentration (351.2 kg U/m/sup 3/) solution driver varied from 14.07 kg to 16.14 kg, and the weight of the …
Date:
August 1, 1979
Creator:
Tuck, G & Oh, I
Object Type:
Report
System:
The UNT Digital Library
An Approach for Assessing Alwr Passive Safety System Reliability
Many advanced light water reactor designs incorporate passive rather than active safety features for front-line accident response. A method for evaluating the reliability of these passive systems in the context of probabilistic risk assessment has been developed at Sandia National Laboratories. This method addresses both the component (e.g. valve) failure aspect of passive system failure, and uncertainties in system success criteria arising from uncertainties in the system's underlying physical processes. These processes provide the system's driving force; examples are natural circulation and gravity-induced injection. This paper describes the method, and provides some preliminary results of application of the approach to the Westinghouse AP600 design.
Date:
January 1, 1991
Creator:
Hake, T. M.
Object Type:
Article
System:
The UNT Digital Library
Achieving Consensus in Environmental Programs
In this paper, we describe a new research effort on consensus tied to the Environmental Restoration Program (ERP) within the US Department of Energy's Office of Defense Waste and Transportation Management (DWTM). We define consensus and explain why consensus decisions are not merely desirable but necessary in furthering ERP activities. As examples of our planned applied research, we first discuss Nominal Group Technique as a representative consensus-generating tool, and we conclude by describing the consensus-related mission of the Waste Management Review Group, established at Virginia Tech to conduct independent, third-party review of DWTM/ERP plans and activities. 10 refs.
Date:
January 1, 1989
Creator:
Kurstedt, Jr., H. A.; Jones, R. M.; Walker, J. A. & Middleman, L. I.
Object Type:
Article
System:
The UNT Digital Library
Beta Particle Measurement and Dosimetry Requirements at NRC-Licensed Facilities
Researchers from Pacific Northwest Laboratroy (PNL) have conducted beta radiation measurements under laboratory and field conditions to assess the degree of the measurement problem and offer suggestions for possible remedies. The primary measurement systems selected for use in this study were the silicon (Si) surface barrier spectrometer system and the multielement beta dosimeter. Three boiling water reactors (BWRs), two pressurized water reactors (PWRs), and one fuel fabrication facility were visited during the course of the study. Although beta fields from cobalt-60 were the most common type found at commercial reactor facilities, higher energy beta fields were found at locations associated with spent fuel handling, liquid radioactive waste, and BWR turbine components. Commercially-available dosimeters and survey instruments were used to measure the same laboratory and licensee facility beta fields characterized with PNL's active and passive spectrometers. A prototype spectrometer was also used in the laboratory measurements. The commercial instruments and dosimeters used in this study typically responded low to the beta fields measured, especially where maximum beta energies were less than approximately 500 keV.
Date:
August 1, 1984
Creator:
Rathbun, L. A.; Endres, G. W. R.; Fox, R. A.; Roberson, P. L. & Scherpelz, R. I.
Object Type:
Report
System:
The UNT Digital Library
Archaeological survey of the 200 East and 200 West Areas, Hanford Site, Washington
Responding to a heavy demand for cultural resource reviews of excavation sites, the Westinghouse Hanford Company contracted with Pacific Northwest Laboratory to conduct a comprehensive archaeological resource review for the 200 Areas of the Hanford Site, Washington. This was accomplished through literature and records review and an intensive pedestrian survey of all undisturbed portions of the 200 East Area and a stratified random sample of the 200 West Area. The survey, followed the Secretary of the Interior's guidelines for the identification of historic properties. The result of the survey is a model of cultural resource distributions that has been used to create cultural resource zones with differing degrees of sensitivity. 11 refs., 7 figs., 1 tab.
Date:
March 1, 1990
Creator:
Chatters, J. C. & Cadoret, N. A.
Object Type:
Report
System:
The UNT Digital Library
Breckinridge Project: Initial Effort
Report IV, Volume 5, provides descriptions, data, and drawings pertaining to Cryogenic Hydrogen Purification (Plant 8), Sour Water Treating (Plant 9), and the Sulfur Plant (Plant 10). Cryogenic Hydrogen Purification (Plant 8) purifies the purge gas stream from the Gas Plant (Plant 7, described in Report IV, Volume 4) to a 93% purity hydrogen product. Sour Water Treating (Plant 9) removes free ammonia and acid gases from sour water and separates them to recover a high quality anhydrous ammonia product. The Sulfur Plant (Plant 10) recovers, as a saleable liquid product, approximately 95% of the sulfur in feed streams from the Gas Plant (Plant 7, described in Report IV, Volume 4), Sour Water Treating (Plant 9), Gasification and Purification (Plant 12, described in Report IV, Volume 6), and Stack Gas Scrubbing (Plant 35, described in Report V, Volume 3). The following information is included for each of the three plants described in this volume: a description of the plant's process design, including the utility balance, catalysts and chemicals usage, and a process flow diagram; an equipment list, including item numbers and descriptions; data sheets and sketches for major plant components; and pertinent engineering drawings. An appendix contains: an overall site …
Date:
unknown
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Analysis of Uranium Urinalysis and in Vivo Measurement Results From Eleven Participating Uranium Mills
Uranium urinalysis and in vivo examination results obtained from workers at eleven uranium mills between 1978 and 1980 were evaluated. The main purpose was to determine the degree of the mills' compliance with bioassay monitoring recommendations given in the draft NRC Regulatory Guide 8.22 (USNRC 1978). The effect of anticipated changes in the draft regulatory guidance, as expressed to PNL in May 1982, was also studied. Statistical analyses of the data showed that the bioassay results did not reliably meet the limited performance criteria given in the draft regulatory guide. Furthermore, quality control measurements of uranium in urine indicated that detection limits at ..cap alpha.. = ..beta.. = 0.05 ranged from 13 ..mu..g/l to 29 ..mu..g/l, whereas the draft regulatory guidance suggests 5 ..mu..g/l as the detection limit. Recommendations for monitoring frequencies given in the draft guide were not followed consistently from mill to mill. The results of these statistical analyses indicate a need to include performance criteria for accuracy, precision, and confidence in revisions of the draft Regulatory Guide 8.22. Revised guidance should also emphasize the need for each mill to continually test the laboratory performing urinalyses by submitting quality control samples (i.e., blank and spiked urine samples as …
Date:
May 1, 1984
Creator:
Spitz, H. B.; Simpson, J. C. & Aldridge, T. L.
Object Type:
Report
System:
The UNT Digital Library
Archaeological and Chemical Analysis of Tell El Yahudiyeh Ware
Typological and geographic analyses indicate that Tell el Yahudiyeh ware (found in Cyprus, Egypt, Nubia, and the Levant during the Middle Bronze period, c. 1750-1550 B.C.) were probably manufactured in two areas, the Nile Valley and the Levant. Activation analysis was carried out and correlated with the archaeological analyses. Results confirm the two "families" of the ware, one Egyptian and one Levantine. Speculations are offered on the social interaction of the period. 11 figures, 2 tables. (DLC)
Date:
January 1, 1978
Creator:
Kaplan, M. F.; Harbottle, G. & Sayre, E. V.
Object Type:
Report
System:
The UNT Digital Library
Benchmark Script and Evaluation Criteria
The Department of Energy's Office of Energy Emergency Management Information System requires time-sharing and remote-job-entry services for their state Energy Emergency Management Information System (EEMIS-S). The Office is soliciting time-sharing services through use of GSA's Teleprocessing Service Program - Multiple Award Schedule Contracts (TSP-MASC) process. The functional mandatory and desirable requirements that candidate vendors should provide are described in the Functional Requirements Document (DOE/EIA/11581-T1). This document, DOE/EIA/11581-T2, describes the Benchmark Scenario and Vendor Evaluation Criteria. Section 1.0 describes the Benchmark, the Benchmark Evaluation, and the Workload Definition. The Vendor Evaluation Criteria and mandatory and desirable hardware and service checklists are described in Section 2.0. To provide compliance with these requirements, a benchmark test will be performed using the vendor';s system.
Date:
October 31, 1980
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Analysis of the Impact of Safeguards Criteria
As part of the US Program of Technical Assistance to IAEA Safeguards, the Pacific Northwest Laboratory (PNL) was asked to assist in developing and demonstrating a model for assessing the impact of setting criteria for the application of IAEA safeguards. This report presents the results of PNL's work on the task. The report is in three parts. The first explains the technical approach and methodology. The second contains an example application of the methodology. The third presents the conclusions of the study. PNL used the model and computer programs developed as part of Task C.5 (Estimation of Inspection Efforts) of the Program of Technical Assistance. The example application of the methodology involves low-enriched uranium conversion and fuel fabrication facilities. The effects of variations in seven parameters are considered: false alarm probability, goal probability of detection, detection goal quantity, the plant operator's measurement capability, the inspector's variables measurement capability, the inspector's attributes measurement capability, and annual plant throughput. Among the key results and conclusions of the analysis are the following: the variables with the greatest impact on the probability of detection are the inspector's measurement capability, the goal quantity, and the throughput; the variables with the greatest impact on inspection costs …
Date:
January 1, 1981
Creator:
Mullen, M. F. & Reardon, P. T.
Object Type:
Report
System:
The UNT Digital Library
Activities of the Department of Energy in Education. Annual Status Report, FY 1978
The Department of Energy's responsibilities in implementing President Carter's National Energy Plan include identifying the appropriate role of educational activities and institutions in that work. This study describes educational activities as they existed one year after the creation of the Department of Energy. Educational activities of educational institutions are included in the study, with the deliberate exception of the very substantial research activity conducted by universities. This report is intended to assist DOE program managers in the utilization of educational process in their operations and to provide guidance and information to the public about the Department's educational activities. For additional historical information, please consult DOE, IR-0008. (RWR)
Date:
January 1, 1979
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
N = 2 Maxwell-Einstein Supergravity Theories: Their Compact and Non-Compact Gaugings and Jordan Algebras
In this talk we give a review of our work on the construction and classification of N = 2 Maxwell-Einstein Supergravity theories (MESGT), study of the underlying algebraical and geometrical structure of these theories, and their compact and non-compact gaugings. We begin by summarizing our construction of the N = 2 MESGT's in five dimensions and give a geometrical interpretation to various scalar dependent quantities in the Lagrangian, based on the constraiants implied by supersymmetry. This is followed by a complete classification of the N = 2 MESGT's whose target manifolds parametrized by the scalar fields are symmetric spaces. 39 refs.
Date:
January 1, 1985
Creator:
Guenaydin, M.; Sierra, G. & Townsend, P.K.
Object Type:
Article
System:
The UNT Digital Library