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Report No.

Solidification behavior of the simulated oxide debris

Sudo, Ayako ; Mizusako, Fumiki*; Hoshino, Kuniyoshi*; Sato, Takumi ; Nagae, Yuji ; Kurata, Masaki 

In order to obtain the knowledge on the phase relationship and stratification behavior of oxide debris under the slow solidification condition, liquefaction/solidification tests of simulated oxide debris were performed by using a high frequency induction furnace. As the oxides components from the core melt and structural materials, sintered pellets of UO$$_{2}$$-ZrO$$_{2}$$-sim-FPs and powder of FeO and B$$_{4}$$C were prepared. The powder mixture and crashed sintered oxides were heated to 2600$$^{circ}$$C in Ar atmosphere in the first step (partial liquefaction), and then solidified at two different cooling rates; furnace cooling (No.1) and slow cooling (5$$^{circ}$$C /min, No.2). For the corium microstructure study, solidified samples were subjected to elemental analysis by SEM/EDX. Cross sectional images of both samples showed that the oxide layer and metallic layer were separately solidified. EDX analysis of oxide layer of No.1 sample revealed four phases; (U$$_{0.6}$$Zr$$_{0.31}$$Fe$$_{0.09}$$)O$$_{2}$$, (Zr$$_{0.51}$$U$$_{0.34}$$Fe$$_{0.15}$$)O$$_{2}$$, ZrO$$_{2}$$ and Fe metal. The tendency of re-distribution of oxide elements observed in No.2 was similar to that of No.1, however, the grain-growth of (Zr,U)O$$_{2}$$ phase occurred at the bottom region of the oxide layer. In these results, the phases detected in both samples were in reasonable accordance with those evaluated by the UO$$_{2}$$-ZrO$$_{2}$$-FeO phase diagram.



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