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Leaching behaviors and mechanisms of vitrified forms for the low-level radioactive solid wastes

Title
Leaching behaviors and mechanisms of vitrified forms for the low-level radioactive solid wastes
Authors
Kim, M.Kim, H.G.Kim, S.Yoon, J.-H.Sung, J.Y.Jin, J.S.Lee, M.-H.Kim, C.-W.Heo, J.Hong, K.-S.
Date Issued
15-Feb-2020
Publisher
ELSEVIER
Abstract
Leaching behaviors and mechanisms of commercialized glass wasteforms to sequester low-level solid-wastes were investigated: SG glass for resin waste and DG-2 glass for dry active waste. After ANS 16.1 leaching test, leachabilities of the nuclides, Co, Cs, and Sr, were all lager than 14, which ma the requirement of the US-Nuclear Regulatory Commission. Holes of diameters 5-10 mu m remained on the surface of the SG and crevices of lengths 10-50 mu m were observed on the surface of the DG-2. We analyzed elemental compositions of the SG and the DG-2 with depths. For the SG, Si, Al, Ca, and Mg were accumulated and Na was depleted up to nearly 1.5 mu m compared to an internal glass. For the DG-2, concentrations of B, Na, Al, Ca and Sr started to decrease from 2.5 mu m even though other minor elements are still remained their concentrations. We suggested leaching mechanisms: alkali elements including H would diffuse through the holes on the SG, while most of the elements including Si and Al would diffuse through the crevices on the DG-2.
Keywords
GLASS ALTERATION KINETICS; ION-EXCHANGE-RESINS; LONG-TERM BEHAVIOR; DISSOLUTION KINETICS; CORROSION; IMMOBILIZATION; ACTINIDES; DIFFUSION; SURROGATE; DISPOSAL
URI
http://oasis.postech.ac.kr/handle/2014.oak/100173
ISSN
0304-3894
Article Type
Article
Citation
JOURNAL OF HAZARDOUS MATERIALS, vol. 384, 2020-02-15
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허종HEO, JONG
Div. of Advanced Nuclear Enginrg
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