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Predominance diagrams of uranium and plutonum species in both lithium chloride-potassium chloride eutectic and calcium chloride

Brown, LD; Abdulaziz, R; Simons, S; Inman, D; Brett, DJL; Shearing, PR; (2013) Predominance diagrams of uranium and plutonum species in both lithium chloride-potassium chloride eutectic and calcium chloride. Journal of Applied Electrochemistry , 43 (12) 1235 - 1241. 10.1007/s10800-013-0611-9. Green open access

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Abstract

Electro-reduction of spent nuclear fuel has the potential to significantly reduce the amount of high level waste from nuclear reactors. Typically, spent uranium and plutonium are recovered via the PUREX process leading to a weapons-grade recovery; however, electro-reduction would allow spent nuclear fuel to be recovered effectively whilst maintaining proliferation resistance. Here, we pres- ent predominance diagrams (also known as Littlewood diagrams) for both uranium and plutonium species in molten lithium chloride–potassium chloride eutectic (LKE) at 500 C and in calcium chloride at 800 C. All diagrams presented depict regions of stability of various phases at unit activity in equilibrium with their respective dissociated ions. The diagrams thermodynamically define the electro- chemical system leading to predictions of reaction condi- tions necessary to electrochemically separate species. The diagrams have been constructed using a pure thermody- namic route; identifying stable species within the molten salt with an assumption of unit activity for each of the phases. These thermodynamically predicted diagrams have been compared to the limited available experimental data; demonstrating good correlation. The diagrams can also be used to predict regions of stability at activities less than unity and is also demonstrated.

Type: Article
Title: Predominance diagrams of uranium and plutonum species in both lithium chloride-potassium chloride eutectic and calcium chloride
Open access status: An open access version is available from UCL Discovery
DOI: 10.1007/s10800-013-0611-9
Language: English
Additional information: Open AccessThis article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s) and the source are credited.
Keywords: Nuclear material, Molten salts, E-pO(2-), Electrochemical reduction, Predominance diagrams, Littlewood diagrams
UCL classification: UCL
UCL > Provost and Vice Provost Offices
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/1412644
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