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Received February 25, 2019
Accepted April 2, 2019
Available online June 3, 2019
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
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First-Principles Study on Thermodynamic Stability of UO2 with He Gas Incorporation via Alpha-Decay
Department of Chemical and Biomolecular Engineering, Yonsei University, 50, Yonsei-ro, Seodaemun-gu, Seoul, 03722, Korea
Korean Chemical Engineering Research, June 2019, 57(3), 368-371(4)
https://doi.org/10.9713/kcer.2019.57.3.368
https://doi.org/10.9713/kcer.2019.57.3.368
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Abstract
Using first principles calculations we investigated the thermomechanical stability of spent nuclear fuels (SNF), especially how mechanical properties of UO2, such as, bulk, shear and Young’s moduli and Poisson’s ratio vary through alpha-decay of U into Th with generation of He gas. Our results indicate that substitution of U by Th through alpha decay (U1-xThxO2) does not significantly affect the stability of the grain in a fuel matrix. In addition, we studied the transport properties of He in and boundaries of the U1-xThxO2 grain. Helium preferentially resides at the grain boundaries through diffusion. Our study can contribute to substantial reduction of environmentally risk and enhancement of our sustainability by safe control of radioactive materials.
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Idiri M, Bihan TL, Heathman S, Rebizant J, Phys. Rev. B, 70, 014113 (2004)
Yun YS, Oppeneer PM, Kim H, Park K, Acta Metall., 57(5), 1655 (2009)
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Macedo P, Capps W, Wachtman J, J. Am. Ceram. Soc., 47(12), 651 (1964)
