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Title: Production and characterization of TRISO fuel particles with multilayered SiC

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. Lastly, finite element analysis of stress evolution in the fuel particles during normalmore » operation with the reference and composite SiC coating layer architectures did not show any significant differences between the variants.« less

Authors:
 [1];  [1]; ORCiD logo [2];  [3]; ORCiD logo [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of California, Berkeley, CA (United States)
  3. Univ. of Tennessee, Knoxville, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Nuclear Energy (NE)
OSTI Identifier:
1491324
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Nuclear Materials
Additional Journal Information:
Journal Volume: 515; Journal Issue: C; Journal ID: ISSN 0022-3115
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS; TRISO; SiC; Nanoindentation; Mechanical properties

Citation Formats

Seibert, Rachel L., Jolly, Brian C., Balooch, Mehdi, Schappel, Daniel, and Terrani, Kurt A. Production and characterization of TRISO fuel particles with multilayered SiC. United States: N. p., 2018. Web. doi:10.1016/j.jnucmat.2018.12.024.
Seibert, Rachel L., Jolly, Brian C., Balooch, Mehdi, Schappel, Daniel, & Terrani, Kurt A. Production and characterization of TRISO fuel particles with multilayered SiC. United States. doi:10.1016/j.jnucmat.2018.12.024.
Seibert, Rachel L., Jolly, Brian C., Balooch, Mehdi, Schappel, Daniel, and Terrani, Kurt A. Sun . "Production and characterization of TRISO fuel particles with multilayered SiC". United States. doi:10.1016/j.jnucmat.2018.12.024.
@article{osti_1491324,
title = {Production and characterization of TRISO fuel particles with multilayered SiC},
author = {Seibert, Rachel L. and Jolly, Brian C. and Balooch, Mehdi and Schappel, Daniel and Terrani, Kurt A.},
abstractNote = {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. Lastly, 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.},
doi = {10.1016/j.jnucmat.2018.12.024},
journal = {Journal of Nuclear Materials},
number = C,
volume = 515,
place = {United States},
year = {2018},
month = {12}
}

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This content will become publicly available on December 16, 2019
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