[en] The feasibility of using a bivariate Chebyshev polynomial to approximate solutions to the two-dimensional neutron diffusion equation is investigated. The two-dimensional two-group neutron diffusion equations are solved by expanding neutron fluxes in a finite series of Chebyshev polynomials over large regions of a fission reactor. All the equations for the expansion coefficients necessary to satisfy the appropriate boundary conditions for the flux and current for a typical region are developed. The resulting system of algebraic equations is solved, using the power iteration method. Since the system of equations is overdetermined, the Gram-Schmidt method of orthogonalization is used. Calculations are done with the aid of a computer code, CDP

[en] Aerojet Heavy Metals Company (AHMC) recently completed a pond decommissioning project which involved the movement and interment of approximately 600,000 cubic feet of uranium- and thorium-contaminated soil. This work was performed by a construction company using standard earth moving equipment and their general labor force. In addition to the construction company employees, geotechnical quality assurance was performed by a soils test engineer and overall construction management was performed by a resident project engineer. Certification of cleanup and inventory sampling were done by contract personnel also. In general, a large complicated project involving several different parties, a large amount of equipment and a large work area was completed with minimal exposure and no spread of contamination to uncontrolled areas. Detailed pre-planning with the project management staff and careful coordination with the actual construction contractor is required. Predictive methods of contamination and air activities can be valuable in assessing the program requirements

[en] The Aerojet Heavy Metals Company (AHMC) facility in Jonesborough, Tennessee used the liquid waste holding pond for waste treatment as part of prior uranium and thorium operations. Several years ago a liquid waste treatment facility was installed and all effluents were treated prior to discharge under NPDES permit to a local stream. The pond became completely inactive during the early spring of 1982. The company has since undertaken a major effort to dewater the pond, remove the sludge, and close the site. The pond was located on the northern edge of the facility's original 5.2 hectare (13-acre) site and had been constructed by excavating the side and base of a hill adjacent to a stream. Facility expansions and land acquisition for future growth had increased the size of the facility production areas and land to 67.2 hectare (168 acres). Between February, 1982 and October, 1984 an extensive subsurface investigation of a dormant waste holding pond at the AHMC facility in Jonesborough was conducted to evaluate its suitability for conversion to a permanent below-ground waste storage impoundment. Existing pond conditions were deemed unsuitable for waste interment and would require considerable modification to provide a quality site. A major design and construction effort was undertaken to change the pond site to one suitable for interment. This paper describes the geotechnical and geohydrological studies related to this evaluation, the resulting design recommendations, and the subsequent construction and monitoring efforts

[en] This report presents the results of an experimental study investigating the potential uses for silicon-polymer encapsulation of High Level Calcine Waste currently stored within the Idaho Nuclear Technology and Engineering Center (INTEC) at the Idaho National Engineering and Environmental Laboratory (INEEL). The study investigated two different applications of silicon polymer encapsulation. One application uses silicon polymer to produce a waste form suitable for disposal at a High Level Radioactive Waste Disposal Facility directly, and the other application encapsulates the calcine material for transportation to an offsite melter for further processing. A simulated waste material from INTEC, called pilot scale calcine, which contained hazardous materials but no radioactive isotopes was used for the study, which was performed at the University of Akron under special arrangement with Orbit Technologies, the originators of the silicon polymer process called Polymer Encapsulation Technology (PET). This document first discusses the PET process, followed by a presentation of past studies involving PET applications to waste problems. Next, the results of an experimental study are presented on encapsulation of the INTEC calcine waste as it applies to transportation or disposal of calcine waste. Results relating to long-term disposal include: (1) a characterization of the pilot calcine waste; (2) Toxicity Characteristic Leaching Procedure (TCLP) testing of an optimum mixture of pilot calcine, polysiloxane and special additives; and, (3) Material Characterization Center testing MCC-1P evaluation of the optimum waste form. Results relating to transportation of the calcine material for a mixture of maximum waste loading include: compressive strength testing, 10-m drop test, melt testing, and a Department of Transportation (DOT) oxidizer test

[en] Aerojet Ordinance Tennessee Inc. (AOT), completed the closure of an inactive waste evaporation pond at its Jonesboro, Tennessee, facility in September 1985. The final closure activities of the comprehensive action program for decommissioning the process waste pond, excavation of associated contaminated soils, and on-site disposal of the contaminated soil are described. Rogers and Associates (RAE) developed remedial action guides for the project and the final designs, and managed the remedial action with the assistance of Dames and Moore. The project represents one of the first actions of this type by a private company. The closure program was performed under licensing by the State of Tennessee

[en] Aerojet Heavy Metals Company (AHMC) completed the decommissioning program for an inactive evaporation pond at its facility near Jonesboro, Tennessee during the summer of 1985. The pond had previously been used for process liquid wastes containing depleted uranium (DU) and thorium contamination. The remedial program included a series of projects by several companies. AHMC coordinated and administered all phases of the program. Rogers and Associates was responsible for the final phases of the program. The use of full-time construction monitoring and surveillance and materials testing provided assurance and documentation that the remedial project was completed in accordance with the design criteria and the construction specifications. Detailed certification sampling indicated that the associated project area had been cleaned up according to the specified radiological guides. The inventory in the 30,000 m/sup 3/ disposal cell is about 0.48 TBq (13 Ci) of U-238 as depleted uranium and 0.03 TBq (1 Ci) of Th-232

[en] This report describes the construction activities for the rockfilled berm and the excavation and disposal of contaminated soil, and the activities to certify the adequacy of the remedial activities. It focuses on the final closure. Mishu and Prewett in a paper in this proceeding provide additional information of the rockfilled wall. The final phase of the remedial program, referred to as the pond closure project, encompassed excavation of contaminated soil from the pond site and entombment of the waste in an encapsulating clay cell. The disposal cell was located at the pond site, and was situated above the level of the projected 100- and 500-year floods from Little Limestone Creek, which is adjacent to the site. The cell was built by completely enclosing the contaminated soil in a compacted clay liner and covering it with a compacted clay cap, each having a minimum thickness of four feet. Contaminated soil from the pond area and Aerojet Heavy Metals Company (AHMC) completed the remedial program for an inactive evaporation pond at its facility near Jonesboro, Tennessee during the summer of 1985. The pond had been used for process liquid wastes containing depleted uranium and thorium. Depleted uranium is a by-product of uranium richment, does not refer to use in a reactor, and does not contain Ra-226 or the associated decay products

[en] Aerojet Heavy Metals Company is performing remedial actions for soil and sediments contaminated with depleted uranium and thorium-232 from several areas of its Jonesboro, Tennessee site. This report describes standards and guides and independent environmental radiological pathway analyses, and have been approved by the State of Tennessee which licenses the facility. The recommended guides are: Level 1: For unrestricted land use - 35 pCi/g of depleted uranium and 5 pCi/g of thorium-232. Level 2: For a disposal area on the industrial site, with land use restrictions - 2000 pCi/g of depleted uranium and 50 pCi/g of thorium-232. These guides are based on the US Nuclear Regulatory Commission guides for onsite disposal of thorium and uranium wastes from past operations, and relatable US Environmental Protection Agency standards and guides

[en] The authors report on the decommissioning of Aerojet Ordnance Tennessee (AOT) located in Jonesborough, Tennessee a manufacturing facility used in Compton, California to manufacture depleted uranium penetrators. The facility had been in operation for 10 years and had manufactured more than 18 million penetrators for the Air Force GAU-8 Weapons Systems

[en] Aerojet Ordinance Tennessee, Inc. (Aerojet) is decommissioning its Compton, California, depleted uranium (DU) manufacturing facility. Aerojet has conducted manufacturing and research and development activities at the facility since 1977 under a State of California Source Materials License. The decontamination and certification of cleanup is being managed by an independent company, Rogers and Associates Engineering Corporation, and the removal of government facilities and decontamination of the facility is being performed by a contractor. The facility will be released for uncontrolled use and is being decontaminated in accordance with US Nuclear Regulatory Commission Guide 1.86. It will be decontaminated to levels as low as reasonably achievable (ALARA). The removal of government facilities/equipment was performed in early 1987. The decontamination of the facility was started in May 1987, and is scheduled for completed in August 1987