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Characterization of fuel debris (28'A), 4; Characterization of simulated MCCI products by light-concentrating heating

Sudo, Ayako ; Takano, Masahide ; Onozawa, Atsushi 

To characterize the reaction layers with respective temperatures around core melt/concrete interface, we have performed MCCI experiments in laboratory scale by using a light-concentrating technique. As minor constituents, Gd$$_{2}$$O$$_{3}$$ (burnable poison and FP), Mo-Ru-Rh-Pd alloy (FP), and sea salt were added in the simulated MCCI debris. The analyses of the top part of the sample identified as-melted (U,Zr)O$$_{2}$$ particles precipitated in silicate glass containing U, Zr, Gd, Fe and Cr. Gd was included in both (U,Zr)O$$_{2}$$ and silicate glass and Mo and the platinum group elements formed alloys with Fe-Ni-Mo-Ru-Rh-Pd. Although almost sea salt evaporated and deposited on the belljar, some S originating from sea salt resulted in precipitation of FeS-type sulfide in the alloy.

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