Nanoscale visualization of crack tips inside molten corium-concrete interaction debris using 3D-FIB-SEM with multiphase positional misalignment correction

Miyata, Hokata*; Yoshida, Kenta*; Konashi, Kenji*; Du, Y.*; Kitagaki, Toru ; Shobu, Takahisa ; Shimada, Yusuke*

Characterizing the fuel debris in Fukushima reactors is essential for developing efficient removal methods. This study analyzed Fe-ZrSiO $_{4}$ -based and (Zr, U)SiO $_{4}$ fuel debris using advanced electron microscopy techniques. At crack tips, a metallic phase of polycrystalline Fe, Cr $_{2}$ O $_{3}$ , and ZrO $_{2}$ with dimples (2-58 ) was observed, with a dislocation density of 2.1 10 $^{14}$ m $^{-2}$ , much higher than typical annealed Fe. A 3D reconstruction revealed a core-shell structure with a (U, Zr)O $_{2}$ core (1-5 ) and a (Zr, U)SiO $_{4}$ shell (2-9 ) in the molten corium-concrete interaction debris.

Language	:	English
Journal	:	Microscopy
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Pages	:	p.dfaf005_1 - dfaf005_10
Publication Year/Month	:	2025/00
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Paper URL	:	https://doi.org/10.1093/jmicro/dfaf005
DOI for research data	:	Link to research data related to this paper/report.
Keywords	:	Fukushima Daiichi Nuclear Power Station Accident; 福島第一原子力発電所事故; 燃料デブリ; MCCI; 福島第一原子力発電所; TEM; SEM
Research Facility	:	第4研究棟
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Article of JAEA R&D Review	:
Cooperating Institute	:	東北大学

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Registration No. : AA20240756
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