Voltammetry of Uranium and Plutonium in Molten LiCl ‐ NaCl ‐ CaCl2 ‐ BaCl2 : I . Reduction of U(III) to Uranium Metal1

Poa, D.S.; Tomczuk, Z.; Steunenberg, R.K.

doi:10.1149/1.2095904

Cited by 36 publications

(23 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Store et al 61 reported two consecutive voltammograms of PbCl 2 -LiCl-KCl that differ significantly from each other, but none of these studies commented on the reason for the variances. In addition, Poa et al, 29 who studied systems with high concentrations of U and Pu in molten salts, reported a discrepancy between results using the same experimental setup. In the majority of the studies, however, no information about the reproducibility of the measurements has been found.…”

Section: Resultsmentioning

confidence: 97%

Method Development for Quantitative Analysis of Actinides in Molten Salts

Tylka

Willit

Prakash

et al. 2015

J. Electrochem. Soc.

View full text Add to dashboard Cite

This paper describes how electrochemical techniques have been used to develop a method for high-precision, real-time quantitative measurements of the concentration of actinides, present in in molten salts as actinide chlorides, for pyrochemical process monitoring applications. Possible reasons for discrepancies between reported measurements obtained with electrochemical techniques have been investigated and a combination of methods to improve their precision has been established. The combination of methods consists of selecting a suitable electroanalytical measurement technique, experimentally verifying assumptions used in its theoretical analysis, ensuring reproducible conditions at the electrode/electrolyte interface, and using an improved method to eliminate the need to know the electrode surface area. By following the developed procedures and refining both experimental techniques and data analysis methods, precise and reproducible measurements were obtained for U and Pu in LiCl/KCl eutectic at 773 K. Preliminary results showed that cyclic voltammetry, along with a method of standard area addition, are very promising tools for in situ quantitative measurements with a degree of precision comparable to destructive analysis techniques. Electrorefining is the main step in pyrochemical reprocessing. During this process, actinides are separated from the bulk of the fission product elements by electrochemical dissolution and electrotransport onto a solid or liquid cathode. The goal of the process is to maximize the separation and recovery of actinides from chlorinated fission products so that minimal amounts of actinides are lost to the process waste stream. [1][2][3][4][5] In addition to efficient actinide recovery, there is a need to address the safeguarding the recycle system. 5 Highprecision, real-time concentration measurements of actinides, present as actinide chlorides, in molten salts are required for process monitoring and control and could be used to support traditional material control and accountability techniques. Development of these measurements is essential to implement and operate a commercial fuel reprocessing facility. [6][7][8][9][10] Electrochemical techniques are well suited for in situ monitoring because they allow rapid, real-time measurements, are compatible with remote handling operations, and do not require the use of standards. Also, the equipment is not affected by the high radiation field present in a fuel processing operation.9,10 Unlike offline destructive analysis techniques, in situ methods do not require representative sample collection and preparation, and therefore avoid problems with sample contamination and degradation. In addition, analytical results can be received in a relatively short period (for example, less than 2 minutes).In an electrochemical cell, the measured potential (E), current (i), or charge (Q) is related to the quantity of the analyte in the solution; therefore, it can serve as an analytical signal for concentration measurements. 11,12 Depending on the applied...

show abstract

Section: Resultsmentioning

confidence: 97%

Method Development for Quantitative Analysis of Actinides in Molten Salts

Tylka

Willit

Prakash

et al. 2015

J. Electrochem. Soc.

View full text Add to dashboard Cite

show abstract

“…The number of the transferred electron, n, was calculated to be 2.6-3.0 from the relation between the cathodic peak potential (E c p ) and the cathodic halfpeak potential (E c p 2 ) as shown in (Eq. (2)) [20] at scan rate between 0.05 and 1 V/s.…”

Section: Resultsmentioning

confidence: 99%

A study on the electrochemical deposition behavior of uranium ion in a LiCl–KCl molten salt on solid and liquid electrode

Kim

Yoon

Paek

et al. 2012

Journal of Electroanalytical Chemistry

View full text Add to dashboard Cite

“…Various investigations have been carried out on the electrochemistry of the U(III)/U couple in molten LiCl-KCl eutectic [5][6][7][8][9][10][11][12][13][14][15][16]. In all studies [5][6][7][8][9][10][11][12][13][14] oxide materials (glasses and alumina) were used in the construction of electrochemical cell, but our experiments showed that these materials interacted with LiCl-KClUCl 3 melt due to the high affinity of uranium to oxygen.…”

Section: Introductionmentioning

confidence: 99%