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The continuous dissolution of 304 stainless steel and stainless steel - UO/sub 2/ alloy in dilute aqua regia was studied with subsequent stripping of the dissolver product to remove chloride ion. The process has the advantage of producing, by means of a simple head end treatment, a solvent extract feed in a conventional nitric acid medium so that existing solvent extraction processes, materials of construction and waste disposal methods can be used. The purposes of this study were to investigate the the variables affecting the dissolution process and to obtain dissolver scale-up data, and to investigate the removal of chloride from the dissolver product and the variables affecting the stripping operation. A continuous flooded pot dissolver was used. It has the advantages of stability of operation and ease of control in comparison with column dissolvers and requires a minimum of mechanical processing prior to dissolution. Stripping of the dissolver prcduct to remove chloride ion was studied in a 4-in. diameter Pyrek bubblecap column containing 12 single babble cap plates. Continuous dissolution rates and dissolver product stainiess steel loadings were correlatsd with aqua regla feed composition, acid feed rats and surface area exposed to reaction. Profiles of chloride concentration down the …

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Non-chromium bearing brazing alloys containing large percentages of nickel (89 to 93 wt%) show good corrosion resistance to the NaF-KF-LiF-UF{sub 4} (11.2-41.0- 45.3-2.5 mole %, fuel 107) mixture at 1500{degrees}F under seesaw-test conditions. Corrosive action by fuel 107 was greater than that by NaF-ZrF{sub 4}-UF{sub 4} (53.5-40.0- 6.5 mole %, fuel 44) mixture on nickel-base brazing alloys tested.

In the dry chemistry process of the Metal Fabrication Building, plutonium oxalate as received from the Isolation Building is converted to plutonium tetrafluoride and the fluoride is then reduced to the metal. This document discusses the oxalate-fluoride conversion which involves oxidation of the oxalate and subsequent fluorination of the oxide, utilizing anhydrous HF gas. Batch operation is practiced. The standard batch for the period covered by this report was 400 g Pu.