Microstructurally explicit study of transport phenomena in uranium oxide

Harn Chyi Lim, Karin Rudman, Kapil Krishnan, Robert McDonald, Pedro Peralta, Patricia Dickerson, Darrin Byler, Chris Stanek, Kenneth J. McClellan

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Transport mechanisms, such as mass and heat transfer, are critical to the efficiency and the reliability of nuclear fuels such as uranium oxide. These properties can be significantly affected by the microstructure of materials. This paper looks into the effects of grain boundary (GB) Kapitza resistance on the overall thermal conductivity and fission gas transport of UO2 using a 3-D finite element model with microstructurally explicit information. The model developed is created with a reconstruction of the microstructure of depleted uranium samples performed using serial sectioning techniques with Focused Ion Beam (FIB) and Electron Backscattering Diffraction (EBSD). The properties of these microstructural entities are characterized by misorientation angles and Coincident Site Lattice (CSL) models, which provide a framework to assign spatially dependent thermal and mass transfer properties based on the location and connectivity of these entities in actual microstructures. The key feature of this model is the coupling between heat transfer and mass transfer of fission products which makes it a multi-physics model capable of following the evolution of thermal performance as fission products are produced.

Original languageEnglish (US)
Title of host publicationTMS 2014 - 143rd Annual Meeting and Exhibition, Supplemental Proceedings
PublisherMinerals, Metals and Materials Society
Number of pages7
ISBN (Print)9781118889725
StatePublished - 2014
Event143rd Annual Meeting and Exhibition, TMS 2014 - San Diego, CA, United States
Duration: Feb 16 2014Feb 20 2014

Publication series

NameTMS Annual Meeting


Other143rd Annual Meeting and Exhibition, TMS 2014
Country/TerritoryUnited States
CitySan Diego, CA


  • Fission gas release
  • Microstructure
  • Percolation

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys


Dive into the research topics of 'Microstructurally explicit study of transport phenomena in uranium oxide'. Together they form a unique fingerprint.

Cite this