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Title: Electron microscopy study of Pd, Ag, and Cs in carbon areas in the locally corroded SiC layer in a neutron-irradiated TRISO fuel particle

Here, a detailed electron microscopy study was performed on focused ion beam-prepared lamellae from different locations relative to a crack across the inner pyrolytic carbon layer of a neutron-irradiated tristructural isotropic-coated particle. The distribution and composition of fission products across the inner pyrolytic carbon and silicon carbide (SiC) layers were studied. Previously, this crack was identified in the particle that released significant inventory fractions of cesium and silver during irradiation and displayed localized palladium pileup with SiC degradation. In this study, carbon areas were found in the SiC layer close to the crack tip and they had precipitates that consisted mostly of palladium silicides or palladium, with silver and/or cadmium frequently identified. Results confirmed that areas in the SiC layer close to the crack tip with localized accumulation of palladium were corroded by palladium, forming pure carbon areas and palladium silicide that provided pathways for silver, cadmium and cesium migration.
Authors:
 [1] ;  [2] ; ORCiD logo [3] ; ORCiD logo [3]
  1. Missouri Univ. of Science and Technology, Rolla, MO (United States). Dept. of Materials Science and Engineering
  2. Idaho National Lab. (INL), Idaho Falls, ID (United States). Fuel Design and Development Dept.
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Fusion and Materials for Nuclear Systems Division
Publication Date:
Report Number(s):
INL/JOU-15-36792-Rev000
Journal ID: ISSN 0955-2219
Grant/Contract Number:
AC05-00OR22725; AC07-05ID14517
Type:
Accepted Manuscript
Journal Name:
Journal of the European Ceramic Society
Additional Journal Information:
Journal Volume: 38; Journal Issue: 12; Journal ID: ISSN 0955-2219
Publisher:
Elsevier
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Idaho National Lab. (INL), Idaho Falls, ID (United States)
Sponsoring Org:
USDOE Office of Nuclear Energy (NE)
Country of Publication:
United States
Language:
English
Subject:
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS; TRISO particle; Fission product; Transport mechanism; Corrosion; Neutron irradiation; 11 - NUCLEAR FUEL CYCLE AND FUEL MATERIALS; tristructural isotropic; AGR; ART; inner pyrolytic carbon; scanning transmission electron microscopy; Electron microscopy; TRISO
OSTI Identifier:
1440838
Alternate Identifier(s):
OSTI ID: 1469311

Wen, Haiming, van Rooyen, Isabella J., Hunn, John D., and Gerczak, Tyler J.. Electron microscopy study of Pd, Ag, and Cs in carbon areas in the locally corroded SiC layer in a neutron-irradiated TRISO fuel particle. United States: N. p., Web. doi:10.1016/j.jeurceramsoc.2018.05.003.
Wen, Haiming, van Rooyen, Isabella J., Hunn, John D., & Gerczak, Tyler J.. Electron microscopy study of Pd, Ag, and Cs in carbon areas in the locally corroded SiC layer in a neutron-irradiated TRISO fuel particle. United States. doi:10.1016/j.jeurceramsoc.2018.05.003.
Wen, Haiming, van Rooyen, Isabella J., Hunn, John D., and Gerczak, Tyler J.. 2018. "Electron microscopy study of Pd, Ag, and Cs in carbon areas in the locally corroded SiC layer in a neutron-irradiated TRISO fuel particle". United States. doi:10.1016/j.jeurceramsoc.2018.05.003.
@article{osti_1440838,
title = {Electron microscopy study of Pd, Ag, and Cs in carbon areas in the locally corroded SiC layer in a neutron-irradiated TRISO fuel particle},
author = {Wen, Haiming and van Rooyen, Isabella J. and Hunn, John D. and Gerczak, Tyler J.},
abstractNote = {Here, a detailed electron microscopy study was performed on focused ion beam-prepared lamellae from different locations relative to a crack across the inner pyrolytic carbon layer of a neutron-irradiated tristructural isotropic-coated particle. The distribution and composition of fission products across the inner pyrolytic carbon and silicon carbide (SiC) layers were studied. Previously, this crack was identified in the particle that released significant inventory fractions of cesium and silver during irradiation and displayed localized palladium pileup with SiC degradation. In this study, carbon areas were found in the SiC layer close to the crack tip and they had precipitates that consisted mostly of palladium silicides or palladium, with silver and/or cadmium frequently identified. Results confirmed that areas in the SiC layer close to the crack tip with localized accumulation of palladium were corroded by palladium, forming pure carbon areas and palladium silicide that provided pathways for silver, cadmium and cesium migration.},
doi = {10.1016/j.jeurceramsoc.2018.05.003},
journal = {Journal of the European Ceramic Society},
number = 12,
volume = 38,
place = {United States},
year = {2018},
month = {5}
}