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Feasibility Of Gas Phase Decontamination Of Gaseous Diffusion Equipment
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Book Synopsis Feasibility of Gas-phase Decontamination of Gaseous Diffusion Equipment by :
Download or read book Feasibility of Gas-phase Decontamination of Gaseous Diffusion Equipment written by and published by . This book was released on 1993 with total page 63 pages. Available in PDF, EPUB and Kindle. Book excerpt: The five buildings at the K-25 Site formerly involved in the gaseous diffusion process contain 5000 gaseous diffusion stages as well as support facilities that are internally contaminated with uranium deposits. The gaseous diffusion facilities located at the Portsmouth Gaseous Diffusion Plant and the Paducah Gaseous Diffusion Plant also contain similar equipment and will eventually close. The decontamination of these facilities will require the most cost-effective technology consistent with the criticality, health physics, industrial hygiene, and environmental concerns; the technology must keep exposures to hazardous substances to levels as low as reasonably achievable (ALARA). This report documents recent laboratory experiments that were conducted to determine the feasibility of gas-phase decontamination of the internal surfaces of the gaseous diffusion equipment that is contaminated with uranium deposits. A gaseous fluorinating agent is used to fluorinate the solid uranium deposits to gaseous uranium hexafluoride (UF6), which can be recovered by chemical trapping or freezing. The lab results regarding the feasibility of the gas-phase process are encouraging. These results especially showed promise for a novel decontamination approach called the long-term, low-temperature (LTLT) process. In the LTLT process: The equipment is rendered leak tight, evacuated, leak tested, and pretreated, charged with chlorine trifluoride (ClF3) to subatmospheric pressure, left for an extended period, possibly> 4 months, while processing other items. Then the UF6 and other gases are evacuated. The UF6 is recovered by chemical trapping. The lab results demonstrated that ClF3 gas at subatmospheric pressure and at (almost equal to) 75°F is capable of volatilizing heavy deposits of uranyl fluoride from copper metal surfaces sufficiently that the remaining radioactive emissions are below limits.
Book Synopsis Gas Phase Decontamination of Gaseous Diffusion Process Equipment by : R. D. Bundy
Download or read book Gas Phase Decontamination of Gaseous Diffusion Process Equipment written by R. D. Bundy and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Gas Phase Decontamination of Gaseous Diffusion Process Equipment by :
Download or read book Gas Phase Decontamination of Gaseous Diffusion Process Equipment written by and published by . This book was released on 1994 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: D & D of the process facilities at the gaseous diffusion plants (GDPs) will be an enormous task. The EBASCO estimate places the cost of D & D of the GDP at the K-25 Site at approximately $7.5 billion. Of this sum, nearly $4 billion is associated with the construction and operation of decontamination facilities and the dismantlement and transport of contaminated process equipment to these facilities. In situ long-term low-temperature (LTLT) gas phase decontamination is being developed and demonstrated at the K-25 site as a technology that has the potential to substantially lower these costs while reducing criticality and safeguards concerns and worker exposure to hazardous and radioactive materials. The objective of gas phase decontamination is to employ a gaseous reagent to fluorinate nonvolatile uranium deposits to form volatile LJF6, which can be recovered by chemical trapping or freezing. The LTLT process permits the decontamination of the inside of gas-tight GDP process equipment at room temperature by substituting a long exposure to subatmospheric C1F for higher reaction rates at higher temperatures. This paper outlines the concept for applying LTLT gas phase decontamination, reports encouraging laboratory experiments, and presents the status of the design of a prototype mobile system. Plans for demonstrating the LTLT process on full-size gaseous diffusion equipment are also outlined briefly.
Book Synopsis Investigation of Gas-phase Decontamination of Internally Radioactively Contaminated Gaseous Diffusion Process Equipment and Piping by :
Download or read book Investigation of Gas-phase Decontamination of Internally Radioactively Contaminated Gaseous Diffusion Process Equipment and Piping written by and published by . This book was released on 1991 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt: Construction of the gaseous diffusion plants (GDPs) was begun during World War 2 to produce enriched uranium for defense purposes. These plants, which utilized UF6 gas, were used primarily for this purpose through 1964. From 1959 through 1968, production shifted primarily to uranium enrichment to supply the nuclear power industry. Additional UF6-handling facilities were built in feed and fuel-processing plants associated with the uranium enrichment process. Two of the five process buildings at Oak ridge were shut down in 1964. Uranium enrichment activities at Oak Ridge were discontinued altogether in 1985. In 1987, the Department of Energy (DOE) decided to proceed with a permanent shutdown of the Oak Ridge Gaseous Diffusion Plant (ORGDP). DOE intends to begin decommissioning and decontamination (D D) of ORGDP early in the next century. The remaining two GDPs are expected to be shut down during the next 10 to 40 years and will also require D D, as will the other UF6-handling facilities. This paper presents an investigation of gas- phase decontamination of internally radioactively contaminated gaseous diffusion process equipment and piping using powerful fluorinating reagents that convert nonvolatile uranium compounds to volatile UF6. These reagents include ClF3, F2, and other compounds. The scope of D D at the GDPs, previous work of gas-phase decontamination, four concepts for using gas-phase decontamination, plans for further study of gas-phase decontamination, and the current status of this work are discussed. 13 refs., 15 figs.
Book Synopsis Preconceptual Design of the Gas-phase Decontamination Demonstration Cart by :
Download or read book Preconceptual Design of the Gas-phase Decontamination Demonstration Cart written by and published by . This book was released on 1993 with total page 47 pages. Available in PDF, EPUB and Kindle. Book excerpt: Removal of uranium deposits from the interior surfaces of gaseous diffusion equipment will be a major portion of the overall multibillion dollar effort to decontaminate and decommission the gaseous diffusion plants. Long-term low-temperature (LTLT) gas-phase decontamination is being developed at the K-25 Site as an in situ decontamination process that is expected to significantly lower the decontamination costs, reduce worker exposure to radioactive materials, and reduce safeguard concerns. This report documents the preconceptual design of the process equipment that is necessary to conduct a full-scale demonstration of the LTLT method in accordance with the process steps listed above. The process equipment and method proposed in this report are not intended to represent a full-scale production campaign design and operation, since the gas evacuation, gas charging, and off-gas handling systems that would be cost effective in a production campaign are not cost effective for a first-time demonstration. However, the design presented here is expected to be applicable to special decontamination projects beyond the demonstration, which could include the Deposit Recovery Program. The equipment will therefore be sized to a 200 ft size 1 converter (plus a substantial conservative design margin), which is the largest item of interest for gas phase decontamination in the Deposit Recovery Program. The decontamination equipment will allow recovery of the UF6, which is generated from the reaction of ClF3 with the uranium deposits, by use of NaF traps.
Book Synopsis Developments in Surface Contamination and Cleaning: Methods for Surface Cleaning by : Rajiv Kohli
Download or read book Developments in Surface Contamination and Cleaning: Methods for Surface Cleaning written by Rajiv Kohli and published by William Andrew. This book was released on 2016-11-04 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt: Developments in Surface Contamination and Cleaning: Methods for Surface Cleaning, Volume 9, part of the Developments in Surface Contamination and Cleaning series provide a state-of-the-art guide to the current knowledge on the behavior of film-type and particulate surface contaminants and their associated cleaning methods. This newest volume in the series discusses methods of surface cleaning of contaminants and the resources that are needed to deal with them. Taken as a whole, the series forms a unique reference for professionals and academics working in the area of surface contamination and cleaning. A strong theme running through the series is that of surface contamination and cleaning at the micro and nano scales. - Provides a comprehensive coverage of innovations in surface cleaning - Written by established experts in the surface cleaning field, presenting an authoritative resource - Contains a comprehensive review of the state-of-the-art, including case studies to enhance the learning process
Download or read book Energy Research Abstracts written by and published by . This book was released on 1993 with total page 622 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :Molten Salt Panel of the Committee on Remediation of Buried and Tank Wastes Publisher :National Academies Press ISBN 13 :0309590108 Total Pages :148 pages Book Rating :4.3/5 (95 download)
Book Synopsis Evaluation of the U.S. Department of Energy's Alternatives for the Removal and Disposition of Molten Salt Reactor Experiment Fluoride Salts by : Molten Salt Panel of the Committee on Remediation of Buried and Tank Wastes
Download or read book Evaluation of the U.S. Department of Energy's Alternatives for the Removal and Disposition of Molten Salt Reactor Experiment Fluoride Salts written by Molten Salt Panel of the Committee on Remediation of Buried and Tank Wastes and published by National Academies Press. This book was released on 1997-03-12 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book discusses the technical alternatives for cleanup of radioactive fluoride salts that were the fuel for the Molten Salt Reactor Experiment, a novel nuclear reactor design that was tested in the 1960s at the Oak Ridge National Laboratory in Tennessee. These fluoride salts pose an unusual cleanup challenge. The book discusses alternatives for processing and removing the salts based on present knowledge of fluoride salt chemistry and nuclear reactions of the radioactive constituents.
Book Synopsis Evaluation of the U.S. Department of Energy's Alternatives for the Removal and Disposition of Molten Salt Reactor Experiment Fluoride Salts by : National Research Council
Download or read book Evaluation of the U.S. Department of Energy's Alternatives for the Removal and Disposition of Molten Salt Reactor Experiment Fluoride Salts written by National Research Council and published by National Academies Press. This book was released on 1997-03-26 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book discusses the technical alternatives for cleanup of radioactive fluoride salts that were the fuel for the Molten Salt Reactor Experiment, a novel nuclear reactor design that was tested in the 1960s at the Oak Ridge National Laboratory in Tennessee. These fluoride salts pose an unusual cleanup challenge. The book discusses alternatives for processing and removing the salts based on present knowledge of fluoride salt chemistry and nuclear reactions of the radioactive constituents.
Book Synopsis The Stability of CI02 as a Product of Gas Phase Decontamination Treatments by :
Download or read book The Stability of CI02 as a Product of Gas Phase Decontamination Treatments written by and published by . This book was released on 1994 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: The gas phase decontamination project is investigating the use of chlorine trifluoride (ClF3) to fluorinate nonvolatile uranium deposits to produce uranium hexafluoride (UF6) gas. The potential existence of chlorine dioxide (ClO2) during gas phase decontamination with ClF3 has been the subject of recent safety discussions. Some of the laboratory data collected during feasibility studies of the gas phase process has been evaluated for the presence of ClO2 in the product gas stream. The preliminary evidence to date can be summarized as follows: (1) ClO2 was not detected in the flow loop in the absence of ClF3; (2) ClO2 was not detected in the static reactors in the absence of both ClF3 and ClF; and (3) ClO2 was detected in a static reactor in the absence of all fluorinating gases. The experimental evidence suggests that ClO2 will not exist in the presence of ClF3, ClF, or UF6. The data analyzed to date is insufficient to determine the stability of ClO2 in the presence of ClO2F. Thermodynamic calculations of the ClF3 + H2O system support the experimental evidence, and suggest that ClO2 will not exist in the presence of ClO2F. Additional experimental efforts are needed to provide a better understanding of the gas phase ClF3 treatments and the product gases. However, preliminary evidence to date suggests that ClO2 should not be present as a product during the normal operations of the gas phase decontamination project.
Book Synopsis Proceedings of the Topical Meeting on Decommissioning, Decontamination and Reutilization of Commercial and Government Facilities by :
Download or read book Proceedings of the Topical Meeting on Decommissioning, Decontamination and Reutilization of Commercial and Government Facilities written by and published by . This book was released on 1997 with total page 678 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Proceedings of the International Conference on Decommissioning and Decontamination and on Nuclear and Hazardous Waste Management by : American Nuclear Society
Download or read book Proceedings of the International Conference on Decommissioning and Decontamination and on Nuclear and Hazardous Waste Management written by American Nuclear Society and published by . This book was released on 1998 with total page 778 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Government Reports Announcements & Index by :
Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1993 with total page 1030 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Government Reports Annual Index by :
Download or read book Government Reports Annual Index written by and published by . This book was released on 1993 with total page 1290 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sections 1-2. Keyword Index.--Section 3. Personal author index.--Section 4. Corporate author index.-- Section 5. Contract/grant number index, NTIS order/report number index 1-E.--Section 6. NTIS order/report number index F-Z.
Book Synopsis Bibliography on Nuclear Reactor Fuel Reprocessing and Waste Disposal: Fissionable material-recovery by : T. F. Connolly
Download or read book Bibliography on Nuclear Reactor Fuel Reprocessing and Waste Disposal: Fissionable material-recovery written by T. F. Connolly and published by . This book was released on 1960 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1975-04 with total page 1082 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Oak Ridge Health Studies Phase 1 Report: Dose reconstruction feasibility study. pt. A. Tasks 1 & 2. A summary of historial activities on the Oak Ridge Reservation with emphasis on information concerning off-site emissions of hazardous materials. pt. B. Tasks 3 & 4. Identification of important environmental pathways for materials released from the Oak Ridge Reservation. pt. C. Task 5. A summary of information concerning historical locations and activities of populations potentially affected by releases from the Oak Ridge Reservation. pt. D. Task 6. Hazard summaries for important materials at the Oak Ridge Reservation by :
Download or read book Oak Ridge Health Studies Phase 1 Report: Dose reconstruction feasibility study. pt. A. Tasks 1 & 2. A summary of historial activities on the Oak Ridge Reservation with emphasis on information concerning off-site emissions of hazardous materials. pt. B. Tasks 3 & 4. Identification of important environmental pathways for materials released from the Oak Ridge Reservation. pt. C. Task 5. A summary of information concerning historical locations and activities of populations potentially affected by releases from the Oak Ridge Reservation. pt. D. Task 6. Hazard summaries for important materials at the Oak Ridge Reservation written by and published by . This book was released on 1993 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt:
