Thermodynamic Assessment of UO2 Pellet Oxidation in Mixture Atmospheres under Spent Fuel Pool AccidentReport as inadecuate




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For an analysis of the oxidation behavior of UO2 nuclear fuelpellet under a loss of water coolant accident in a spent nuclear fuel pool ofan LWR, thermodynamic assessments of UO2 oxidation were carried outunder various atmospheric conditions. In a steam atmosphere, it was assessedthat UO2 would not be fully oxidized into U3O8 due to the relatively lower oxygen partial pressure, while UO2 willbe fully oxidized into U3O8 in an air atmosphere. In anair and steam mixture atmosphere, the UO2 oxidation was dominantlyaffected by the air volumetric fraction, because of the relatively higheroxygen partial pressure of air. In addition, the effect of H2 volumetric fraction on the oxygen partial pressure under a mixture atmospherewas calculated, and it was revealed that UO2 pellet oxidation couldbe reduced above the critical value of H2 volumetric fraction.

KEYWORDS

Spent Nuclear Fuel Pool, UO2 Fuel Pellet, UO2 Oxidation, Oxygen Partial Pressure

Cite this paper

Kim, D. , Kim, J. , Kim, K. , Yang, J. , Kim, S. and Koo, Y. 2015 Thermodynamic Assessment of UO2 Pellet Oxidation in Mixture Atmospheres under Spent Fuel Pool Accident. World Journal of Nuclear Science and Technology, 5, 102-106. doi: 10.4236-wjnst.2015.52009.





Author: Dong-Joo Kim*, Jong Hun Kim, Keon Sik Kim, Jae Ho Yang, Sun Ki Kim, Yang-Hyun Koo

Source: http://www.scirp.org/



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