Influence of SiC grain boundary character on fission product transport in irradiated TRISO fuel

JOURNAL OF NUCLEAR MATERIALS

卷:473

Article

Lillo, T. M.¹  van Rooyen, I. J.² 

[1] Idaho Natl Lab, Mat Sci & Engn Dept, Idaho Falls, ID 83415 USA

[2] Idaho Natl Lab, Fuel Performance & Design Dept, Idaho Falls, ID 83415 USA

关键词: TRISO;    SiC;    Grain boundary character;    Fission product transport;   

DOI  :  10.1016/j.jnucmat.2016.01.040

来源: Elsevier

【 摘 要 】

In this study, the fission product precipitates at silicon carbide grain boundaries from an irradiated TRISO particle were identified and correlated with the associated grain boundary characteristics. Precession electron diffraction in the transmission electron microscope provided the crystallographic information needed to identify grain boundary misorientation and boundary type (i.e., low angle, random high angle or coincident site lattice (CSL)-related). The silicon carbide layer was found to be composed mainly of twin boundaries and small fractions of random high angle and low angle grain boundaries. Most fission products were found at random, high-angle grain boundaries, with small fractions at low-angle and CSL-related grain boundaries. Palladium (Pd) was found at all types of grain boundaries while Pd-uranium and Pd-silver precipitates were only associated with CSL-related and random, high-angle grain boundaries. Precipitates containing only Ag were found only at random, high-angle grain boundaries, but not at low angle or CSL-related grain boundaries. (C) 2016 Elsevier B.V. All rights reserved.

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