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- In relation to this article, we declare that there is no conflict of interest.
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Received May 17, 2007
Accepted June 12, 2007
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A semi-empirical model for the air oxidation kinetics of UO2
Korea Atomic Energy Research Institute, 150-1 Dukjin-dong, 1045 Daedeokdaero, Yuseong, Daejeon 305-353, Korea
bhpark@kaeri.re.kr
Korean Journal of Chemical Engineering, January 2008, 25(1), 59-63(5), 10.1007/s11814-008-0010-9
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Abstract
UO2 is readily oxidized to U3O8 at a high temperature, and this reaction has received considerable attention in the field of nuclear fuel cycles. A voloxidation process which makes use of the characteristics of a UO2 oxidation has been developed to treat the spent fuels produced by irradiation of UO2. In this work, semi-empirical kinetic models to describe the sigmoidal behavior of a UO2 oxidation were selected and compared in order to obtain a kinetic expression with different temperatures. Two basic approaches of a nucleation-and-growth model and an autocatalytic reaction model were adequate enough to describe the S-shaped oxidation behavior, and an equation to correlate the model parameters with the temperature was introduced. The calculation results of the two models satisfy the experimental data for UO2 spheres and the activation energy of a reaction rate constant was evaluated. The models were also adopted as a surface reaction time term for a UO2 pellet.
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References
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Choi JW, McEachern RJ, Talyor P, Wood DD, J. Nucl. Mater., 230, 250 (1996)
You GS, Kim KS, Kim DK, Ro SG, J. Nucl. Mater., 277, 325 (2000)
Nicholson EL, ORNL Report, ORNL/CF-76/65, Oak Ridge National Laboratory, Oak Ridge, U.S.A (1976)
Groenier WS, ORNL Report, ORNL/CF-77/67, Oak Ridge National Laboratory, Oak Ridge, U.S.A (1977)
Uchiyama G, Kitamura M, Yamazaki K, Torikai S, Sugikawa S, Maeda M, Tsujino T, Radioactive Waste Management and the Nuclear Fuel Cycle, 17, 63 (1992)
Jeong SM, Park SB, Hong SS, Seo CS, Park SW, J. Radioanal. Nucl. Chem., 268, 349 (2006)
Park SB, Park BH, Jeong SM, Hur JM, Seo CS, Choi SH, Park SW, J. Radioanal. Nucl. Chem., 268, 489 (2006)
Park BH, Park SB, Jeong SM, Seo CS, Park SW, J. Radioanal. Nucl. Chem., 270, 575 (2006)
Peakallr KA, Antill JE, J. Nucl. Mater., 2, 194 (1960)
Harrison KT, Padgett C, Scott KT, J. Nucl. Mater., 23, 121 (1967)
Ohashi H, Noda E, Morozumi T, J. Nucl. Sci. Technol., 11, 445 (1974)
McEachern RJ, J. Nucl. Mater., 245, 238 (1997)
McEachern RJ, Taylor P, J. Nucl. Mater., 254, 87 (1998)
Jeong SM, Kwon KC, Park BH, Seo CS, React. Kinet. Catal. Lett., 89(2), 269 (2006)
Suemitsu M, Togashi H, Abe T, Thin Solid Films, 428(1-2), 83 (2003)
Quintas M, Brandao TRS, Silva CLM, J. Food Eng., 78, 537 (2007)
Kang KH, Na SH, Song KC, Lee SH, Kim SW, Thermochim. Acta, 455(1-2), 129 (2007)
Levenspiel O, Chemical reaction engineering, 2nd ed., Wiley, New York (1972)
