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Element and microstructure analysis of the molten corium-concrete products for estimating Fukushima Daiichi Nuclear Power Plant condition

Liu, P.*; Du, Y.*; 吉田 健太*; 北垣 徹 ; 池田 篤史  ; 嶋田 雄介*; 永井 康介*

Liu, P.*; Du, Y.*; Yoshida, Kenta*; Kitagaki, Toru; Ikeda, Atsushi; Shimada, Yusuke*; Nagai, Yasuyoshi*

To understanding molten corium-concrete interaction (MCCI) progression, the element distribution and crystallization mechanism of the simulant MCCI product are studied. The simulated corium and concrete material were blended uniformly and annealed by using electric furnace at 1400$$^{circ}$$C in air and Ar-5% H$$_{2}$$, respectively. By analysis of element distribution by SEM-EDS, the three main phases can be confirmed in two samples: SiO$$_{2}$$ glass matrix, ZrSiO$$_{4}$$, and Fe-Cr-Ni. The important discrepancy between two samples is that Fe-Cr-Ni phase is oxidized in air-sample. The select-area electron diffraction pattern reveals the iron in Fe-Cr-Ni has $$alpha$$-Fe BCC lattice. The crystal structure and element distribution of ZrSiO$$_{4}$$ phase will be studied in future.

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