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题名:
STEM-EDS analysis of fission products in neutron-irradiated TRISO fuel particles from AGR-1 experiment
作者: Leng, B; van Rooyen, IJ; Wu, YQ; Szlufarska, I; Sridharan, K
刊名: JOURNAL OF NUCLEAR MATERIALS
出版日期: 2016
卷号: 475, 期号:-, 页码:62—70
关键词: SILICON-CARBIDE ; AG DIFFUSION ; COATED PARTICLES ; SILVER DIFFUSION ; IDENTIFICATION ; TRANSPORT ; PALLADIUM ; RELEASE ; PD
DOI: 10.1016/j.jnucmat.2016.03.008
通讯作者: van Rooyen, IJ (reprint author), Idaho Natl Lab, Fuel Design & Dev Dept, Idaho Falls, ID 83415 USA.
文章类型: 期刊文献
英文摘要: Historic 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.
收录类别: SCI
语种: 英语
WOS记录号: WOS:000377307300008
ISSN号: 0022-3115
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.sinap.ac.cn/handle/331007/25837
Appears in Collections:中科院上海应用物理研究所2011-2017年_期刊论文

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Recommended Citation:
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,2016-01-01,475(-):62—70.
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