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in subjects: "Nitric Acid"  
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Tritium permeation through characterized films on Type 304L stainless steel

Description: Rocky Flats is looking for an optimum method for surface treating 304L stainless steel to increase its resistance to tritium permeation. Selected surface treatments were applied to 304L samples. One set of samples was shipped to the Rockwell Corporate Science Center for alternate characterization analysis. Another set was sent to Los Alamos National Laboratory for tritium exposure and ion beam spectrographic analysis. The Science Center performed the following analyses: ellipsometry, contact po… more
Date: July 24, 1987
Creator: Kallas, A.J.; Rising, T.L.; Childs, E.L. & Thomas, R.L. (ed.)
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Metallography of maraging 350 steel

Description: A technique for etching maraging 350 steel with Glyceregia is described. Surface activation procedures are integral to this technique. Microstructural features revealed by this technique are compared with those obtained with Kalling's reagent, Fry's reagent, and 5% Nital, three etchants commonly used to reveal microstructures of maraging steels. Features which may be simultaneously revealed using Glyceregia include prior austenite grain boundaries, martensitic structure, precipitates, titanium … more
Date: January 1, 1987
Creator: Hutson, S. M. & Merten, C. W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Thermodynamic modeling of chemical equilibria in metal extraction. [TBP, CMPO]

Description: Models of equilibrium extraction data are being developed for use in computer simulations of metal extraction processes. The correlations are based on chemical mass action principles in which the effects of metal complexation and aqueous phase activity coefficients are considered. Activity coefficients in mixed electrolyte solutions at high ionic strengths are calculated using methods available in the literature. This modeling approach is demonstrated for HNO/sub 3/ extraction with both the PIR… more
Date: January 1, 1987
Creator: Chaiko, D.J.; Fredrickson, D.R.; Reichley-Yinger, L. & Vandegrift, G.F.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

The influence of plutonium concentration and solution flow rate on the effective capacity of macroporous anion exchange resin. [Lewatit MP-500-FK; Pu/sup +/]

Description: The principal aqueous process used to recover and purify plutonium at the Los Alamos Plutonium Facility is anion exchange in nitric acid. Previous studies with gel-type anion exchange resin have shown an inverse relationship between plutonium concentration in the feed solution and the optimum flow rate for this process. Because gel-type resin has been replaced with macroporous resin at Los Alamos, the relationship between plutonium concentration and solution flow rate was reexamined with the se… more
Date: July 1, 1987
Creator: Marsh, S. F. & Gallegos, T. D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The effect of fluoride and aluminum on the anion exchange of plutonium from nitric acid

Description: Anion exchange in nitric acid is a prominent aqueous process used to recover and purify plutonium from impure nuclear materials. This process is sensitive to fluoride ion, which complexes plutonium in competition with the anionic nitrato complex that is strongly sorbed on the anion exchange column. Fluoride interference traditionally has been counteracted by adding a masking agent, such as aluminum, that forms competing complexes with fluoride. The interfering effect of fluoride is known to be … more
Date: July 1, 1987
Creator: Marsh, S.F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Cerium oxalate precipitation

Description: Cerium, a nonradioactive, common stand-in for plutonium in development work, has been used to simulate several plutonium precipitation processes at the Savannah River Laboratory. There are similarities between the plutonium trifluoride and the cerium oxalate precipitations in particle size and extent of plating, but not particle morphology. The equilibrium solubility, precipitation kinetics, particle size, extent of plating, and dissolution characteristics of cerium oxalate have been investigat… more
Date: February 1, 1987
Creator: Chang, T. P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Waste acid detoxification and reclamation: Summary of bench-scale tests for FY 1986 and FY 1987

Description: Processes to reduce the volume, quantity, and toxicity of metal-bearing waste acid are being demonstrated at Pacific Northwest Laboratory. Two precipitation processes and a distillation process are being developed to minimize waste from fuel fabrication operations, which comprise a series of metal-finishing operations. Waste process acids such as HF-HNO/sub 3/, etch solutions containing Zr as a major metal impurity, and HNO/sub 3/ strip solution containing Cu as a major metal impurity are detox… more
Date: September 1, 1987
Creator: Stewart, T. L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The influence of copper on Zircaloy spent fuel cladding degradation under a potential tuff repository condition

Description: This paper reports the results of an experiment designed to detect the influence of copper on Zircaloy spent fuel cladding degradation in one possible repository environment. Copper and copper alloys are being considered for use in a tuff repository. The compatibility of a copper waste package container and the Zircaloy cladding on spent fuel has been questioned essentially because copper ion has been observed to accelerate zirconium alloy corrosion in acid environments, as does ferric iron, an… more
Date: March 1987
Creator: Smith, H. D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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