Comparison of microstructural and micro-chemical evolutions in the irradiated fuel kernels of AGR-1 and AGR-2 TRISO fuel particles

•Irradiated kernels mainly consisted of UO2 and UC(O0.0x) phases.•Zr, Nb, Mo, Ru, Tc concentrate in uranium carbide phase.•Fission gas bubbles stay in uranium carbide phase.•Excess Mo, Ru, Tc form U(Mo, Tc)C2 or URuC2, and Nb forms oxide shell at pore surface.

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Bibliographic Details
Published in:Progress in nuclear energy (New series) 2024-11, Vol.176 (C), p.105361, Article 105361
Main Authors: Fu, Zhenyu, He, Lingfeng, van Rooyen, Isabella J., Yang, Yong
Format: Article
Language:English
Subjects:
Fission products
Kernel
Post irradiation examination
TRISO fuel
UCO fuel
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Description
Summary:•Irradiated kernels mainly consisted of UO2 and UC(O0.0x) phases.•Zr, Nb, Mo, Ru, Tc concentrate in uranium carbide phase.•Fission gas bubbles stay in uranium carbide phase.•Excess Mo, Ru, Tc form U(Mo, Tc)C2 or URuC2, and Nb forms oxide shell at pore surface.
ISSN:0149-1970
DOI:10.1016/j.pnucene.2024.105361