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Journal of Industrial and Environmental Chemistry | Volume 2
GREEN CHEMISTRY &
TECHNOLOGY
7th International Conference on
J u n e 1 8 - 2 0 , 2 0 1 8 | D u b l i n , I r e l a n d
Woo-Seok Choi, J Ind Environ Chem 2018, Volume 2 | DOI: 10.4066/2591-7331-C1-003
ELECTRO DECONTAMINATION
BEHAVIOR OF THE SIMULATED
RADIOACTIVE NI-CO ALLOY WASTE
USING ELECTROREFINING IN LICL-KCL
5-WT.% NICL2
Woo-Seok Choi
Chungnam National University, Republic of Korea
As the number of end-of-life reactors increases in the world, the
demand for decontamination technology is increasing. In Republic
of Korea, there is an urgent need to secure nuclear power plant
decommissioning technology as eight nuclear power plants will reach the
end of their lifespans by 2030, the first being the Kori unit 1, which was
the 161st nuclear power plant to be permanently shut down in the world
on June, 2017. Presently, Republic of Korea is focusing on developing
and supporting technology required for nuclear decommissioning, and
27 core technologies for decommissioning have been secured. However,
there is insufficient development of decontamination technology for the
reduction and recycling of large amounts of radioactive metal wastes,
which totaled up to 26,255 m3 in the case of the Kori unit 1. This study
utilized an Inconel-1~10 wt. % Co alloy to simulate radioactive metal
waste to investigate the decontamination potential of LiCl-KCl-5 wt.%
NiCl2 molten salt electrolytes. Electrochemical analysis was performed
by conducting cyclic voltammetry to confirm the redox behavior of Ni ions
in LiCl-KCl-5 wt.% NiCl2 electrolytes. Decontamination experiments were
performed by conducting cyclic voltammetry to analyze the oxidation
behavior of Inconel-1~10 wt.% Co alloy metals (anode) and the reduction
behavior of STS316L (40 mm x 80 mm x 0.5t) electrodes (cathode), in
addition to the properties of the electrolyte. By conducting experiments,
the reduction potential of Ni at a potential of-0.17 V (vs. W reference
electrode) was confirmed, and the Co decontamination factor (DF) of
the reduction product was found to have a value of 2,480 through ICP-
MS analysis. The reduced products produced from the first electrolytic
refining stage is expected to satisfy the allowable concentration for self-
disposal (3.04 x 10-4 Bg/g) after the second electrolytic refining stage.
Woo-Seok Choi has studied at Chungnam Uni-
versity, Republic of Korea. His major is elect-
roreduction and electrorefining. He has studied
at the department of materials science and en-
gineering and nanomaterial process laboratory
of Prof. Jong-Hyeon Lee.
BIOGRAPHY