This paper deals with the estimation of and of the PuPu redox couple in LiCl-KCl eutectic melt using statistical data fitting of experimental data. The value was also estimated in our laboratory at 723 and 773 K using logarithmic analysis of semi-integral voltammograms and chronopotentiograms. From semi-integral curves, was found to be −2.888  0.021 and −2.810  0.021 V at 723 and 773 K, respectively, whereas it was −2.851  0.020 V at 773 K from the analysis of chronopotentiograms. Based on subsequent statistical analysis, we recommend the following expressions for and applicable for the temperature range 673 to 823 K:andThe value in LiCl-KCl eutectic melt was estimated from calculated for the reactionusing FactSage package, and it was expressed as