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STEM-EDS analysis of fission products in neutron-irradiated TRISO fuel particles from AGR-1 experiment
Leng, B; van Rooyen, IJ; Wu, YQ; Szlufarska, I; Sridharan, K; van Rooyen, IJ (reprint author), Idaho Natl Lab, Fuel Design & Dev Dept, Idaho Falls, ID 83415 USA.
2016
Source PublicationJOURNAL OF NUCLEAR MATERIALS
ISSN0022-3115
Volume475Issue:-Pages:62—70
Subtype期刊文献
AbstractHistoric and recent post-irradiation-examination from the German AVR and Advanced Gas Reactor Fuel Development and Qualification Project have shown that 110 m Ag is released from intact tristructural isotropic (TRISO) fuel. Although TRISO fuel particle research has been performed over the last few decades, little is known about how metallic fission products are transported through the SiC layer, and it was not until March 2013 that Ag was first identified in the SiC layer of a neutron-irradiated TRISO fuel particle. The existence of Pd-and Ag-rich grain boundary precipitates, triple junction precipitates, and Pd nano-sized intragranular precipitates in neutron-irradiated TRISO particle coatings was investigated using Scanning Transmission Electron Microscopy and Energy Dispersive Spectroscopy analysis to obtain more information on the chemical composition of the fission product precipitates. A U-rich fission product honeycomb shape precipitate network was found near a micron-sized precipitate in a SiC grain about similar to 5 mu m from the SiC-inner pyrolytic carbon interlayer, indicating a possible intragranular transport path for uranium. A single Ag-Pd nano-sized precipitate was found inside a SiC grain, and this is the first research showing such finding in irradiated SiC. This finding may possibly suggest a possible Pd-assisted intragranular transport mechanism for Ag and may be related to void or dislocation networks inside SiC grains. Preliminary semi-quantitative analysis indicated the micron-sized precipitates to be Pd2Si2U with carbon existing inside these precipitates. However, the results of such analysis for nano-sized precipitates may be influenced by the SiC matrix. The results reported in this paper confirm the co-existence of Cd with Ag in triple points reported previously. (C) 2016 Published by Elsevier B.V.
KeywordSilicon-carbide Ag Diffusion Coated Particles Silver Diffusion Identification Transport Palladium Release Pd
DOI10.1016/j.jnucmat.2016.03.008
Indexed BySCI
Language英语
WOS IDWOS:000377307300008
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.sinap.ac.cn/handle/331007/25837
Collection中科院上海应用物理研究所2011-2018年
Corresponding Authorvan Rooyen, IJ (reprint author), Idaho Natl Lab, Fuel Design & Dev Dept, Idaho Falls, ID 83415 USA.
Recommended Citation
GB/T 7714
Leng, B,van Rooyen, IJ,Wu, YQ,et al. STEM-EDS analysis of fission products in neutron-irradiated TRISO fuel particles from AGR-1 experiment[J]. JOURNAL OF NUCLEAR MATERIALS,2016,475(-):62—70.
APA Leng, B,van Rooyen, IJ,Wu, YQ,Szlufarska, I,Sridharan, K,&van Rooyen, IJ .(2016).STEM-EDS analysis of fission products in neutron-irradiated TRISO fuel particles from AGR-1 experiment.JOURNAL OF NUCLEAR MATERIALS,475(-),62—70.
MLA Leng, B,et al."STEM-EDS analysis of fission products in neutron-irradiated TRISO fuel particles from AGR-1 experiment".JOURNAL OF NUCLEAR MATERIALS 475.-(2016):62—70.
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