Fundamental Chemistry of U and Pu in the TBP-Dodecane-Nitric Acid System
نویسندگان
چکیده
The speciation of hexavalent U and tetravalent Pu will be examined in the TBP-dodecanenitric acid systems. This topic is chosen based on data needs for separation modeling identified by the AFCI. Emphasis will be placed on studying the influence of nitrate and acetohydroxamic acid on U and Pu speciation as well as conditions where a third phase forms in the organic phase. The organic phase will be 30 % TBP in dodecane. Equal volumes of aqueous and organic phase will be used. The speciation of the actinides in the aqueous and organic phase will be determined by a number of different spectroscopic and radiochemical techniques. Additionally the actinide distribution between the phases as a function of conditions will be determined. The project data will be incorporated into models to evaluate separations under a variety of conditions. Fundamental Chemistry of the Actinides in Solvent Extraction......................................................1 1. Background and Rational .........................................................................................................2 1.1. Project Rational ................................................................................................................2 1.2. Pu Nitrate Data and Third Phase Formation ....................................................................2 1.3. Acetohydroxamic acid......................................................................................................4 1.4. Evaluation of Chemical Thermodynamic and Kinetic Data ............................................5 2. Research Objectives and Goals ................................................................................................6 3. Technical Impact ......................................................................................................................7 4. Research Approach ..................................................................................................................7 4.1. Task 1. Influence of nitrate on the speciation of U and Pu in the TBP-dodecane-nitric acid system ...................................................................................................................................7 4.2. Task 2. Speciation of U and Pu with AHA in the presence and absence of TBPdodecane organic phase................................................................................................................8 4.3. Task 3. Complexation Modeling......................................................................................8 5. Capabilities...............................................................................................................................8 6. Project Timeline .......................................................................................................................9
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