2 Matching Results

Search Results

Advanced search parameters have been applied.

Stabilization of Rocky Flats combustible residues contaminated with plutonium metal and organic solvents

Description: This report describes tests on a proposed flowsheet designed to stabilize combustible residues that were generated at the Rocky Flats Environmental Technology Site (RFETS) during the machining of plutonium metal. Combustible residues are essentially laboratory trash contaminated with halogenated organic solvents and plutonium metal. The proposed flowsheet, designed by RFETS, follows a glovebox procedure that includes (1) the sorting and shredding of materials, (2) a low temperature thermal desorption of solvents from the combustible materials, (3) an oxidation of plutonium metal with steam, and (4) packaging of the stabilized residues. The role of Los Alamos National Laboratory (LANL) in this study was to determine parameters for the low temperature thermal desorption and steam oxidation steps. Thermal desorption of carbon tetrachloride (CCl{sub 4}) was examined using a heated air stream on a Rocky Flats combustible residue surrogate contaminated with CCl{sub 4}. Three types of plutonium metal were oxidized with steam in a LANL glovebox to determine the effectiveness of this procedure for residue stabilization. The results from these LANL experiments are used to recommend parameters for the proposed RFETS stabilization flowsheet.
Date: September 30, 1998
Creator: Bowen, S.M.; Cisneros, M.R.; Jacobson, L.L.; Schroeder, N.C. & Ames, R.L.
Partner: UNT Libraries Government Documents Department

Sorption of americium in tuff and pure minerals using synthetic and natural groundwaters

Description: The distribution of Am between selected solid and liquid phases has been studied using initial {sup 241}Am solutions with a molarity smaller than 1 {times} 10{sup {minus}11}. The synthetic and natural groundwaters used have pH values in the 7--8 range and a total alkalinity of approximately 1 mN which is mainly due to bicarbonate. Mass spectrometric isotope dilution was utilized to determine the amount of Am in the solution phase initially and after equilibrium was attained. Using this sensitive technique, 7 {times} 10{sup 8} atoms of {sup 241}Am were accurately measured. Our results indicate that the percent of Am lost to the walls of the container in the absence of geologic material varies from 35 to 84. The Am sorption coefficient determined is on the order of 10{sup 3} ml/g for clinoptilolite, 10{sup 4} ml/g for tuff consisting mainly of alkali feldspar and cristobalite, and 10{sup 5} ml/g for romanechite. 12 refs.
Date: December 1, 1989
Creator: Triay, I.R.; Meijer, A.; Cisneros, M.R.; Miller, G.G.; Mitchell, A.J.; Ott, M.A. et al.
Partner: UNT Libraries Government Documents Department