|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Computational Materials Science and Engineering for Nuclear Energy
||Grain Growth and Grain Subdivision in Triuranium Disilicide, a Potential Light Water Reactor Fuel
||Amani Cheniour, Michael Tonks, Jie Lian, Yongfeng Zhang
|On-Site Speaker (Planned)
U3Si2 is a potential accident tolerant fuel for light water reactors. It has higher thermal conductivity and uranium density than UO2 .
Grain growth can have important consequences on the fuel behavior and therefore needs to be studied at typical temperatures in a U3Si2 fuel pellet.
Grain subdivision is characterized by the formation of a structure of nano-sized grains called the high burnup structure. It happens in UO2 below a certain temperature and above a certain burnup. This threshold needs to be determined for U3Si2. In this work, we compare the free energy of a system of large grains with high concentrations of radiation defects and fission gas atoms to the free energy of a system of nano-sized grains to determine this threshold.
We use the MARMOT mesoscale fuel performance code to investigate both grain growth and grain subdivision. We will present our simulation approaches and current results.
||Planned: Supplemental Proceedings volume