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Park, Jaeyeong
Fuel Cycle and Waste Laboratory
Research Interests
  • Radioactive waste treatment and management; Spent nuclear fuel recycling; Decontamination and Decommissioning; Nuclear Fuel Cycle

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Separation of Zr from Zr-2.5Nb by Electrorefining in LiCl-KCl for Volumetric Decontamination of CANDU Pressure Tube

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Title
Separation of Zr from Zr-2.5Nb by Electrorefining in LiCl-KCl for Volumetric Decontamination of CANDU Pressure Tube
Author
Hur, JunghoJeong, SeongjinSohn, SungjoonPark, JaeyeongHwnag, Il Soon
Issue Date
2021-04
Publisher
MDPI
Citation
APPLIED SCIENCES-BASEL, v.11, no.9, pp.3790
Abstract
This study presents an experimental investigation on Zr separation from Zr-2.5Nb by anode potentiostatic electrorefining in LiCl-KCl-ZrCl4 0.5 wt. % at 773 K for irradiated CANDU pressure tube decontamination. By the ORIGEN-2 code calculation, radioactive characteristics were investigated to show that Nb-94 was the most significant radionuclide with an aspect of waste level reduction by electrorefining. Three electrorefining tests were performed by fixing the applied potential as −0.9 V (vs. Ag/AgCl 1 wt. %) at the anode to dissolve only Zr. A cathode basket was installed to collect detached deposits from the cathode. Electrorefining results showed Zr was deposited on the cathode with a small amount of Nb and other alloying elements. The chemical form of the cathode deposits was shown to be only Zr metal or a mixture of Zr metal and ZrCl, depending on the experimental conditions related to the surface area ratio of the cathode to the anode. It was determined that the Zr metal reduction at the cathode was attributed to the two-step reduction reaction of Zr4+/ZrCl and ZrCl/Zr.
URI
https://scholarworks.unist.ac.kr/handle/201301/52789
URL
https://www.mdpi.com/2076-3417/11/9/3790
DOI
10.3390/app11093790
ISSN
2076-3417
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