|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Accident Tolerant Fuels for Light Water Reactor
||Calculating Swelling in U3Si2 Nuclear Fuel Using a Multi-scale Computational Approach
||Larry Aagesen, Karim Ahmed, Benjamin Beeler, David Andersson, Daniel Schwen, Yongfeng Zhang
|On-Site Speaker (Planned)
Recently, U3Si2 has been investigated as a potential accident-tolerant fuel for commercial nuclear power applications. Although its melting temperature is lower than that of UO2, its significantly higher thermal conductivity suggests that the margin to fuel melting may be higher than in UO2 in accident scenarios. However, very little information is available on the extent of swelling in pellet-form U3Si2 fuel. To estimate swelling for use in engineering-scale fuel performance simulations, a multi-scale computational approach has been employed. A phase-field model of fission gas bubble evolution has been developed to simulate microstructural evolution in U3Si2 fuel. The phase-field model has been parameterized using atomistic methods, including density-functional theory and molecular dynamics simulations. Using the microstructure-level simulations, a strategy for calculating swelling for input to engineering-scale models is discussed.
||Planned: Supplemental Proceedings volume