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Report No.
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Deposition behavior of cesium molybdate on Type304 austenite stainless steel in severe accident

Do, Thi-Mai-Dung*; Sujatanond, S.*; Ogawa, Toru

The chemical behavior of cesium molybdate (Cs$$_{2}$$MoO$$_{4}$$) in light water reactors during severe nuclear accidents remains unexplored. This study demonstrated the deposition behavior of cesium molybdate (Cs$$_{2}$$MoO$$_{4}$$) on stainless steel (SUS304) at 1530-530 K under dry (Ar) and humid (Ar + H$$_{2}$$O) conditions. Cs$$_{2}$$MoO$$_{4}$$ was partially decomposed on the SUS surface, thereby inducing the oxidation of iron (Fe) and chromium (Cr) under dry condition. Molybdenum metal (Mo) and molybdenum dioxide (MoO$$_{2}$$) were detected on the surface, while Cs coexisted with chromium in the oxide layer at 1500 K. Both Cs$$_{2}$$MoO$$_{4}$$ and Mo metal were identified on the SUS surface at 1230 K. Under the humid condition, the oxidation of the SUS was affected by Cs$$_{2}$$MoO$$_{4}$$vapor. Molybdenum was detected in the form of spots in the iron oxide layer, while cesium was not detected at above 1500 K. Mo was detected on the surface of SUS oxide at 1230 K. Cs$$_{2}$$MoO$$_{4}$$ was deposited on SUS at 730-530 K under both the dry and humid conditions. The results were discussed in relation with the thermodynamic model of the Cs-Fe-Cr-Mo-O system. Thus, the chemical behavior of Cs$$_{2}$$MoO$$_{4}$$ at the interior of the reactor cooling system was elucidated.

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Category:Nuclear Science & Technology

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