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Journal Articles

Deposition behavior of cesium molybdate on Type304 austenite stainless steel in severe accident

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

Nuclear Science and Engineering, 196(5), p.584 - 599, 2022/05

https://doi.org/10.1080/00295639.2021.2009985
 Times Cited Count：1 Percentile：8.19(Nuclear Science & Technology)

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.

Journal Articles

Behavior of cesium molybdate, Cs$$_{2}$$MoO$$_{4}$$, in severe accident conditions, 1; Partitioning of Cs and Mo among gaseous species

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

Journal of Nuclear Science and Technology, 55(3), p.348 - 355, 2018/03

https://doi.org/10.1080/00223131.2017.1397560
 Times Cited Count：7 Percentile：49.34(Nuclear Science & Technology)

In order to better understand the behavior of cesium in the severe accident of the LWR, the high-temperature chemistry of Cs$$_{2}$$MoO$$_{4}$$ in H$$_{2}$$O+H$$_{2}$$ gas was studied. The pseudo-binary system, Cs$$_{2}$$MoO$$_{4}$$-MoO$$_{3}$$, was thermochemically modeled with Redlich-Kister formulation to form a basis to analyze the high-temperature behavior of Cs$$_{2}$$MoO$$_{4}$$. The model prediction was compared with the thermogravimetric measurements of Cs$$_{2}$$MoO$$_{4}$$ in dry and humid argon, which revealed that the mass-loss rate was enhanced in the humid atmosphere. Thermochemical model was further applied to predict the partitioning of cesium and molybdenum among gaseous species in the BWR core degradation condition typical of Short-Term Station Blackout.

Oral presentation

Partitioning of Cs and Mo in steam environment

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

no journal, , 

The effect of steam on the partitioning of Cs and Mo at the temperature ranged 1200 $$sim$$ 2600 K was calculated at total pressures of 75 and 3.5 bar, which correspond to those before and after RPV depressurization. The reaction of Cs$$_{2}$$MoO$$_{4}$$ (g) with steam was better described by taking into account the participation of Cs$$_{2}$$Mo$$_{2}$$O$$_{7}$$.

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