AGR-2 irradiated TRISO particle IPyC/SiC interface analysis using FIB-SEM tomography

R. L. Seibert; T. J. Gerczak; G. W. Helmreich; J. D. Hunn

doi:10.1016/j.jnucmat.2022.154104

AGR-2 irradiated TRISO particle IPyC/SiC interface analysis using FIB-SEM tomography

R. L. Seibert, T. J. Gerczak, G. W. Helmreich, J. D. Hunn

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

Abstract

The morphology in the interface region between the inner pyrolytic carbon layer (IPyC) and silicon carbide (SiC) layers in tristructural-isotropic (TRISO) particle fuel from the AGR-2 irradiation experiment were studied using focused ion beam-scanning electron microscopy tomography. This work quantitatively described the interface and corresponding relevant metrics to understand how the microstructural features at the IPyC/SiC interface may influence actinide and fission product interactions with the SiC layer. Particles were selected with varied ^110mAg retention rates, and their volumes were reconstructed and analyzed for distributions of pores, fission product/actinide features, SiC, and IPyC. It was found that porosity accommodates fission products in the interface and SiC layers. The largest fission product/actinide precipitates were found in the interface region. This was also where the largest number fraction of fission products/actinides was found, consistent with SEM showing fission product/actinide pileup along selected areas of the interface region.

Original language	English
Article number	154104
Journal	Journal of Nuclear Materials
Volume	573
DOIs	https://doi.org/10.1016/j.jnucmat.2022.154104
State	Published - Jan 2023

Funding

This work was sponsored by the U.S. Department of Energy, Office of Nuclear Energy-Advanced Reactor Technologies as part of the Advanced Gas Reactor Fuel Development and Qualification Program. Hot cell activities were supported by the staff of the ORNL Irradiated Fuels Examination Laboratory. A special thank you to Chuck Baldwin, Zach Burns, Bob Morris, Jesse Werden, and Darren Skitt at ORNL for their support with particle preparation for this work. The authors would also like to thank Caleb Massey and Peter Doyle at ORNL for providing technical reviews of the paper.

Funders	Funder number
Advanced Gas Reactor Fuel Development and Qualification Program
Office of Nuclear Energy-Advanced Reactor Technologies
U.S. Department of Energy
Oak Ridge National Laboratory

Keywords

3D Analysis
AGR
SiC, IPyC
TRISO

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10.1016/j.jnucmat.2022.154104

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title = "AGR-2 irradiated TRISO particle IPyC/SiC interface analysis using FIB-SEM tomography",

abstract = "The morphology in the interface region between the inner pyrolytic carbon layer (IPyC) and silicon carbide (SiC) layers in tristructural-isotropic (TRISO) particle fuel from the AGR-2 irradiation experiment were studied using focused ion beam-scanning electron microscopy tomography. This work quantitatively described the interface and corresponding relevant metrics to understand how the microstructural features at the IPyC/SiC interface may influence actinide and fission product interactions with the SiC layer. Particles were selected with varied 110mAg retention rates, and their volumes were reconstructed and analyzed for distributions of pores, fission product/actinide features, SiC, and IPyC. It was found that porosity accommodates fission products in the interface and SiC layers. The largest fission product/actinide precipitates were found in the interface region. This was also where the largest number fraction of fission products/actinides was found, consistent with SEM showing fission product/actinide pileup along selected areas of the interface region.",

keywords = "3D Analysis, AGR, SiC, IPyC, TRISO",

author = "Seibert, {R. L.} and Gerczak, {T. J.} and Helmreich, {G. W.} and Hunn, {J. D.}",

note = "Publisher Copyright: {\textcopyright} 2022",

year = "2023",

month = jan,

doi = "10.1016/j.jnucmat.2022.154104",

language = "English",

volume = "573",

journal = "Journal of Nuclear Materials",

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T1 - AGR-2 irradiated TRISO particle IPyC/SiC interface analysis using FIB-SEM tomography

AU - Seibert, R. L.

AU - Gerczak, T. J.

AU - Helmreich, G. W.

AU - Hunn, J. D.

PY - 2023/1

Y1 - 2023/1

N2 - The morphology in the interface region between the inner pyrolytic carbon layer (IPyC) and silicon carbide (SiC) layers in tristructural-isotropic (TRISO) particle fuel from the AGR-2 irradiation experiment were studied using focused ion beam-scanning electron microscopy tomography. This work quantitatively described the interface and corresponding relevant metrics to understand how the microstructural features at the IPyC/SiC interface may influence actinide and fission product interactions with the SiC layer. Particles were selected with varied 110mAg retention rates, and their volumes were reconstructed and analyzed for distributions of pores, fission product/actinide features, SiC, and IPyC. It was found that porosity accommodates fission products in the interface and SiC layers. The largest fission product/actinide precipitates were found in the interface region. This was also where the largest number fraction of fission products/actinides was found, consistent with SEM showing fission product/actinide pileup along selected areas of the interface region.

AB - The morphology in the interface region between the inner pyrolytic carbon layer (IPyC) and silicon carbide (SiC) layers in tristructural-isotropic (TRISO) particle fuel from the AGR-2 irradiation experiment were studied using focused ion beam-scanning electron microscopy tomography. This work quantitatively described the interface and corresponding relevant metrics to understand how the microstructural features at the IPyC/SiC interface may influence actinide and fission product interactions with the SiC layer. Particles were selected with varied 110mAg retention rates, and their volumes were reconstructed and analyzed for distributions of pores, fission product/actinide features, SiC, and IPyC. It was found that porosity accommodates fission products in the interface and SiC layers. The largest fission product/actinide precipitates were found in the interface region. This was also where the largest number fraction of fission products/actinides was found, consistent with SEM showing fission product/actinide pileup along selected areas of the interface region.

KW - 3D Analysis

KW - AGR

KW - SiC, IPyC

KW - TRISO

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DO - 10.1016/j.jnucmat.2022.154104

M3 - Article

AN - SCOPUS:85141922885

SN - 0022-3115

VL - 573

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

M1 - 154104

ER -

AGR-2 irradiated TRISO particle IPyC/SiC interface analysis using FIB-SEM tomography

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Keywords

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