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A Computational Meta-Analysis of UCl<sub>3</sub> Cyclic Voltammograms in LiCl-KCl Electrolyte
Cumberland, Riley M.,Yim, Man-Sung The Electrochemical Society 2014 Journal of the Electrochemical Society Vol.161 No.4
<P>As a way to characterize the values of key parameters for modeling electrochemical transport of elements in a molten salt system, a meta-analysis of CV reduction peaks for UCl<SUB>3</SUB> in LiCl-KCl eutectic was performed. Published CV data was fit using least squares fitting software coupled with electrochemical simulation software. The analysis yielded estimates of apparent standard potential, the diffusion coefficient, and the exchange current density for each reaction. The results for the UCl<SUB>3</SUB> reduction peak matched well with existing data.</P>
Development of a 1D transient electrorefiner model for pyroprocess simulation
Cumberland, R.M.,Yim, M.S. Pergamon Press ; Elsevier Science Ltd 2014 Annals of nuclear energy Vol.71 No.-
Development of an efficient 1-dimensional computer code to model mass transport and separation in electrorefining, a key component process of pyroprocessing, is described in this paper. A variety of phenomena occurring in electrochemical devices is reviewed along with examination of existing computer models to provide basis for new model development. Key processes and phenomena of importance were selected based on describing rate-limiting steps and separation efficiency of electrorefining. The developed model, named ERAD, describes time-dependent behavior of multi-component electrochemical systems with the capability of depicting anodic dissolution of spent nuclear fuel, non-hydrodynamic mass transport effects in the electrolyte, and cathodic deposition of materials. Utilization of the model is demonstrated through comparison with existing experimental data. For the purpose of model validation, model predictions are also compared with cyclic voltammetry and other experimental data.
ANALYSIS OF EQUILIBRIUM METHODS FOR THE COMPUTATIONAL MODEL OF THE MARK-IV ELECTR OREFINER
Cumberland, Riley,Hoover, Robert,Phongikaroon, Supathorn,Yim, Man-Sung Korean Nuclear Society 2011 Nuclear Engineering and Technology Vol.43 No.6
Two computational methods for determining equilibrium states for the Mark-IV electrorefiner (ER) have been assessed to improve the current computational electrorefiner model developed at University of Idaho. Both methods were validated against measured data to better understand their effects on the calculation of the equilibrium compositions in the ER. In addition, a sensitivity study was performed on the effect of specific unknown activity coefficients-including sodium in molten cadmium, zirconium in molten cadmium, and sodium chloride in molten LiCl-KCl. Both computational methods produced identical results, which stayed within the 95% confidence interval of the experimental data. Furthermore, sensitivity to unavailable activity coefficients was found to be low (a change in concentration of less than 3 ppm).
ANALYSIS OF EQUILIBRIUM METHODS FOR THE COMPUTATIONAL MODEL OF THE MARK-IV ELECTR OREFINER
RILEY CUMBERLAND,ROBERT HOOVER,SUPATHORN PHONGIKAROON,임만성 한국원자력학회 2011 Nuclear Engineering and Technology Vol.43 No.6
Two computational methods for determining equilibrium states for the Mark-IV electrorefiner (ER) have been assessed to improve the current computational electrorefiner model developed at University of Idaho. Both methods were validated against measured data to better understand their effects on the calculation of the equilibrium compositions in the ER. In addition, a sensitivity study was performed on the effect of specific unknown activity coefficients—including sodium in molten cadmium, zirconium in molten cadmium, and sodium chloride in molten LiCl-KCl. Both computational methods produced identical results, which stayed within the 95% confidence interval of the experimental data. Furthermore, sensitivity to unavailable activity coefficients was found to be low (a change in concentration of less than 3 ppm).
Simulated real-time process monitoring of a molten salt electrorefiner
Rappleye, D.,Simpson, M.,Cumberland, R.,McNelis, D.,Yim, M.S. North-Holland Pub. Co 2014 Nuclear engineering and design Vol.273 No.-
An alternative approach to monitoring the pyrochemical process (pyroprocessing) for spent nuclear fuel treatment is proposed and examined. This approach relies on modeling and the real-time analysis of process readings. Using an electrorefiner model, named ERAD, cathode potential and cell current were identified as useful process readings. To provide a real-time analysis of these two process readings, an inverse model was developed based on fundamental electrochemical relations. The model was applied to the following operating modes: pure uranium deposition, co-deposition of uranium and plutonium, and co-deposition of uranium and zirconium. Using the cell current and cathode potential, the model predicted which species were depositing and their rates. The deposition rates predicted by the inverse model compared favorably to those calculated by ERAD.