Production and characterization of TRISO fuel particles with multilayered SiC

Rachel L. Seibert, Brian C. Jolly, Mehdi Balooch, Daniel P. Schappel, Kurt A. Terrani

Research output: Contribution to journalArticlepeer-review

44 Scopus citations

Abstract

Three distinct composite architectures of silicon carbide (SiC) and pyrocarbon (PyC) were incorporated into the SiC coating layer of tristructural-isotropic (TRISO) nuclear fuel particles. The composite architectures are meant to increase the resistance of SiC coating layer to cracking and fission product attack during operation and accident scenarios. All composite layers were produced using the existing fluidized bed chemical vapor deposition apparatus that is used for production of TRISO fuel particles without modifications. Detailed characterization of the composite microstructure was carried out via optical and electron microscopy. Nano-indentation examination confirms that mechanical properties of the SiC phase was not affected in the composite architectures, however, the resistance to crack propagation in this coating layer was greatly increased in all cases when compared to the reference monolithic coating layer. The stress required to debond the SiC-inner PyC interface in the reference TRISO particles was determined to be ∼1 GPa using micropillar compression technique. The high strength may explain the ease of crack propagation from the inner PyC to SiC in the reference design. In the composite architectures, the means of crack deflection were effectively incorporated at this interface. Finite element analysis of stress evolution in the fuel particles during normal operation with the reference and composite SiC coating layer architectures did not show any significant differences between the variants.

Original languageEnglish
Pages (from-to)215-226
Number of pages12
JournalJournal of Nuclear Materials
Volume515
DOIs
StatePublished - Mar 2019

Funding

This work was supported by the US Department of Energy, Office of Nuclear Energy , Advanced Fuels Campaign. Brian Wirth provided essential guidance on finite element analysis activities. Micropillar testing was conducted using a demo Hysitron PI 85 unit provided by Ryan Stromberg of Bruker Nano Surfaces Division to Oak Ridge National Laboratory. Tyler Gerczak and Takaaki Koyanagi performed a thorough review of the manuscript. FEI Talos F200X STEM provided by the Department of Energy, Office of Nuclear Energy, Advanced Fuels Campaign and the Nuclear Science User Facilities.

Keywords

  • Mechanical properties
  • Nanoindentation
  • SiC
  • TRISO

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