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Title: Quantification of silicon carbide grain structure in TRISO fuel by BSE image analysis

Abstract

The grain structure of the silicon carbide (SiC) layer in tristructural-isotropic (TRISO) fuels has commonly been qualified in fuel specifications based on a qualitative comparison to visual standards to ensure undesirable microstructure are not produced. This approach is inherently dependent on subjective judgement and provides limited data for analysis or comparison. An alternative method to rapidly quantify (i.e., provide a numeric measure of) the grain structure of the SiC layer in TRISO fuels has been developed. This method relies on the identification of silicon carbide grain boundaries based on brightness variation in backscattered electron (BSE) images through the application of automated image processing algorithms. The speed with which the requisite BSE imaging and analysis may be completed enables the practical use of this method on an industrial scale as a part of qualifying TRISO fuel to meet a given specification on silicon carbide grain structure, which is an important parameter for TRISO fuel performance. The method is benchmarked by comparison to prior Electron-Backscattered Diffraction (EBSD) results for TRISO particles from the Advanced Gas Reactor (AGR) program.

Authors:
ORCiD logo [1];  [2]; ORCiD logo [1]; ORCiD logo [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. X-Energy LLC, Greenbelt, MD (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:
1649543
Alternate Identifier(s):
OSTI ID: 1646730
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Nuclear Materials
Additional Journal Information:
Journal Volume: 533; Journal Issue: 1; Journal ID: ISSN 0022-3115
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS

Citation Formats

Helmreich, Grant, Brown, Daniel, Gerczak, Tyler J., and Hunn, John D.. Quantification of silicon carbide grain structure in TRISO fuel by BSE image analysis. United States: N. p., 2020. Web. https://doi.org/10.1016/j.jnucmat.2020.152075.
Helmreich, Grant, Brown, Daniel, Gerczak, Tyler J., & Hunn, John D.. Quantification of silicon carbide grain structure in TRISO fuel by BSE image analysis. United States. https://doi.org/10.1016/j.jnucmat.2020.152075
Helmreich, Grant, Brown, Daniel, Gerczak, Tyler J., and Hunn, John D.. Fri . "Quantification of silicon carbide grain structure in TRISO fuel by BSE image analysis". United States. https://doi.org/10.1016/j.jnucmat.2020.152075. https://www.osti.gov/servlets/purl/1649543.
@article{osti_1649543,
title = {Quantification of silicon carbide grain structure in TRISO fuel by BSE image analysis},
author = {Helmreich, Grant and Brown, Daniel and Gerczak, Tyler J. and Hunn, John D.},
abstractNote = {The grain structure of the silicon carbide (SiC) layer in tristructural-isotropic (TRISO) fuels has commonly been qualified in fuel specifications based on a qualitative comparison to visual standards to ensure undesirable microstructure are not produced. This approach is inherently dependent on subjective judgement and provides limited data for analysis or comparison. An alternative method to rapidly quantify (i.e., provide a numeric measure of) the grain structure of the SiC layer in TRISO fuels has been developed. This method relies on the identification of silicon carbide grain boundaries based on brightness variation in backscattered electron (BSE) images through the application of automated image processing algorithms. The speed with which the requisite BSE imaging and analysis may be completed enables the practical use of this method on an industrial scale as a part of qualifying TRISO fuel to meet a given specification on silicon carbide grain structure, which is an important parameter for TRISO fuel performance. The method is benchmarked by comparison to prior Electron-Backscattered Diffraction (EBSD) results for TRISO particles from the Advanced Gas Reactor (AGR) program.},
doi = {10.1016/j.jnucmat.2020.152075},
journal = {Journal of Nuclear Materials},
number = 1,
volume = 533,
place = {United States},
year = {2020},
month = {2}
}

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Works referenced in this record:

Development of advanced HTR fuel elements
journal, July 1990


Handbook of SiC properties for fuel performance modeling
journal, September 2007


Evaluation of Fracture Stress for the SiC Layer of TRISO-Coated Fuel Particles Using a Modified Crush Test Method: Evaluation of Fracture Stress for the SiC Layer of TRISO-Coated Fuel Particles
journal, November 2009


SiC layer microstructure in AGR-1 and AGR-2 TRISO fuel particles and the influence of its variation on the effective diffusion of key fission products
journal, November 2016


Microstructure of TRISO coated particles from the AGR-1 experiment: SiC grain size and grain boundary character
journal, January 2013


A Computational Approach to Edge Detection
journal, November 1986

  • Canny, John
  • IEEE Transactions on Pattern Analysis and Machine Intelligence, Vol. PAMI-8, Issue 6
  • DOI: 10.1109/TPAMI.1986.4767851