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Predominance Diagrams of Spent Nuclear Fuel Materials in LiCl-KCl and NaCl-KCl Molten Salt Eutectics

Abdulaziz, R; Brown, LD; Inman, D; Simons, S; Shearing, PR; Brett, DJL; (2016) Predominance Diagrams of Spent Nuclear Fuel Materials in LiCl-KCl and NaCl-KCl Molten Salt Eutectics. Int. J. Electrochem. Sci. , 11 (12) pp. 10417-10435. 10.20964/2016.12.27. Green open access

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Abstract

Predominance phase diagrams for metal-molten salt systems are diagrams of potential vs. the negative logarithm of the activity of O2- ions (E-pO2-); they are a valuable tool for predicting and understanding electrochemical systems and for optimising process conditions. Here, predominance diagrams are produced for the range of nuclear spent materials (U, Pu, Np, Am, Cm, Cs, Nd, Sm, Eu, Gd, Mo, Tc, Ru, Rh, Ag and Cd species), in both LiCl-KCl at 500 ˚C and NaCl-KCl at 750 ˚C. The two salt eutectics were chosen as they are the two main systems used for pyroprocessing; temperatures were selected within each salts normal operating range. All of the diagrams presented show regions of stability for the different metal species, their oxides and chlorides at unit activity; however, this activity can be altered in accordance with the equations derived. Examples of selective electrochemical reduction are also demonstrated for potential spent fuel reprocessing in both salt systems.

Type: Article
Title: Predominance Diagrams of Spent Nuclear Fuel Materials in LiCl-KCl and NaCl-KCl Molten Salt Eutectics
Open access status: An open access version is available from UCL Discovery
DOI: 10.20964/2016.12.27
Publisher version: http://dx.doi.org/10.20964/2016.12.27
Additional information: © 2016 The Authors. Published by ESG (www.electrochemsci.org). This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/4.0/).
Keywords: Science & Technology, Physical Sciences, Electrochemistry, Predominance Diagrams, Spent Fuel, Nuclear Materials, Molten Salts, Pyroprocessing, E-Po(2-) Stability Diagram, Electrochemical Reduction, Calcium-Chloride, Titanium-Dioxide, Thermodynamic Properties, System, Oxides, 450-Degrees-C, Plutonium, Actinides
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering
URI: https://discovery.ucl.ac.uk/id/eprint/1545055
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