CX-020786: Speciation and behavior of neptunium and zirconium in advanced separation process – Oregon State University, Pacific Northwest National Laboratory, and University of Nevada Las Vegas

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Oregon State University (OSU), in collaboration with the Pacific Northwest National Laboratory (PNNL) and the University of Nevada Las Vegas (UNLV), proposes to obtain fundamental data on the speciation and redox properties of neptunium (Np), zirconium (Zr), and reduced technetium (Tc) species in radiation fields. Computational methods will be used to estimate molecular structures of the complex species. The tasks associated with this project are (1) Scoping experimental studies of the redox reactions of Np, Tc, and plutonium (Pu) with uranium (U) IV and hydrazine with and without the degradation products and complexing agents; (2) Use computational modeling and simulations to describe the observed chemical reaction and new complex structures as well as reaction kinetics in the separate phases; (3) Investigate the effect of radiation on physiochemical parameters, such as viscosity of organic phase and interface tension; (4) Solid species possibly isolated from the studied solutions will be characterized by X-ray diffraction spectroscopy and X-ray absorption fine structure spectroscopy; and (5) Adjust extraction flowsheet to best manage Tc, Zr and Np concentrations in the process streams and test proposed adjustments. Existing laboratory facilities will be used.