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

Haiming Wen; Isabella J. van Rooyen; John D. Hunn; Tyler J. Gerczak

doi:10.1016/j.jeurceramsoc.2018.05.003

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

Haiming Wen, Isabella J. van Rooyen, John D. Hunn, Tyler J. Gerczak

Advanced Fuel Fabrication and Instrument

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

24 Scopus citations

Abstract

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.

Original language	English
Pages (from-to)	4173-4188
Number of pages	16
Journal	Journal of the European Ceramic Society
Volume	38
Issue number	12
DOIs	https://doi.org/10.1016/j.jeurceramsoc.2018.05.003
State	Published - Sep 2018

Funding

This work was sponsored by the U.S. Department of Energy Office of Nuclear Energy under U.S. Department of Energy Idaho Operations Office Contract DE-AC07-05ID14517. Charles A. Baldwin is thanked for using the Oak Ridge National Laboratory’s Irradiated Microsphere Gamma Analyzer to detect this failed-SiC TRISO particle among the >4000 normal particles from Compact 5-2-3, measuring Cs and Ag releases and mounting and polishing the TRISO particle to expose the SiC defect after the localized defect area was located using three-dimensional x-ray tomography. James Madden is acknowledged for FIB lamellae preparation and Thomas Lillo is thanked for the review of this paper.

Keywords

Corrosion
Fission product
Neutron irradiation
TRISO particle
Transport mechanism

Access to Document

10.1016/j.jeurceramsoc.2018.05.003

Cite this

@article{7830f2de1ef349fe85d10a4f44f784c5,

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",

abstract = "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.",

keywords = "Corrosion, Fission product, Neutron irradiation, TRISO particle, Transport mechanism",

author = "Haiming Wen and {van Rooyen}, {Isabella J.} and Hunn, {John D.} and Gerczak, {Tyler J.}",

note = "Publisher Copyright: {\textcopyright} 2018 Elsevier Ltd",

year = "2018",

month = sep,

doi = "10.1016/j.jeurceramsoc.2018.05.003",

language = "English",

volume = "38",

pages = "4173--4188",

journal = "Journal of the European Ceramic Society",

issn = "0955-2219",

publisher = "Elsevier",

number = "12",

}

TY - JOUR

T1 - Electron microscopy study of Pd, Ag, and Cs in carbon areas in the locally corroded SiC layer in a neutron-irradiated TRISO fuel particle

AU - Wen, Haiming

AU - van Rooyen, Isabella J.

AU - Hunn, John D.

AU - Gerczak, Tyler J.

PY - 2018/9

Y1 - 2018/9

N2 - 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.

AB - 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.

KW - Corrosion

KW - Fission product

KW - Neutron irradiation

KW - TRISO particle

KW - Transport mechanism

UR - http://www.scopus.com/inward/record.url?scp=85047200416&partnerID=8YFLogxK

U2 - 10.1016/j.jeurceramsoc.2018.05.003

DO - 10.1016/j.jeurceramsoc.2018.05.003

M3 - Article

AN - SCOPUS:85047200416

SN - 0955-2219

VL - 38

SP - 4173

EP - 4188

JO - Journal of the European Ceramic Society

JF - Journal of the European Ceramic Society

IS - 12

ER -

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

Abstract

Funding

Keywords

Access to Document

Other files and links

Fingerprint

Cite this