Effect of different reduction methods on the efficiencies in the chemical decontamination processes |
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Authors: | Hong-Joo Lee Kyeongsook Kim Duk-Won Kang Young Ju Lee |
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Affiliation: | (1) Present address: Research Institute for Innovation in Sustainable Chemistry, National Institute of Advanced Industrial Science and Technology (AIST), 1−1−1 Higashi, Tsukuba, 305-8565 Ibaraki, Japan;(2) Advanced Materials Research Center, Chungnam National University, 220 Gung-dong, Yuseong-gu, 305-764 Daejeon, Korea;(3) Nuclear Power Laboratory, Korea Electric Power Research Institute (KEPRI), 103−16 Munji-Dong, Yuseong-Gu, 305-380 Daejeon, Korea;(4) Gwangju Branch, Korea Basic Science Institute (KBSI), 300 Yongbong-Dong, Buk-Gu, 500-757 Gwangju, Korea |
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Abstract: | Chemical decontamination is considered to be an effective method for reduction of radiation level by dissolution of radioactive
corrosion products and metal oxidizing films existing in the primary system of a nuclear power plant. In this study, the process
efficiencies of two chemical decontamination processes (Methods 1 and 2) having different reduction steps were investigated
through the operation of a semi-pilot scale decontamination equipment as a continuous work. The reduction step for Method
1 employed an adsorbent with an oxygen source, while a reductant (oxalic acid) was used in the reduction step for Method 2.
The dissolution and removal efficiencies of metal species and organic compounds in Method 2 were higher than those in Method
1, implying that oxalic acid in the reduction step increased the process efficiency, their complexes of metal species easily
being removed in the decomposition/cleanup step. It was shown that the process employing chemical reduction showed higher
dissolution and removal efficiencies rather than the process by the physical adsorption on the adsorbent surface through decontamination
processes with different reduction step. |
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Keywords: | Adsorption Chemical Decontamination Process Oxalic Acid Reduction |
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