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Molecular Dynamics Simulation of Fission Fragment Damage in Nuclear Fuel and Surrogate Material

Published online by Cambridge University Press:  09 January 2017

Ram Devanathan
Ram Devanathan*
Affiliation:
Energy and Environment Directorate, Pacific Northwest National Laboratory, Richland WA, 99352, U.S.A.
*
*(Email: ram.devanathan@pnnl.gov)
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Abstract

We have performed classical molecular dynamics simulations of swift heavy ion damage, typical of fission fragments, in nuclear fuel (UO2) for energy deposition per unit length of 3.9 keV/nm. We did not observe amorphization. The damage mainly consisted of isolated point defects. Only about 1% of the displacements occur on the uranium sublattice. Oxygen Frenkel pairs are an order of magnitude more numerous than uranium Frenkel pairs in the primary damage state. In contrast, previous results show that the ratio of Frenkel pairs on the two sublattices is close to the stoichiometric ratio in ceria. These differences in the primary damage state may lead to differences in radiation response of UO2 and CeO2.

Keywords

simulationradiation effectsceramic
Type
Articles
Information
MRS Advances , Volume 2 , Issue 21-22: Energy and Sustainability , 2017 , pp. 1225 - 1230
Copyright
Copyright © Materials Research Society 2017 

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