2016 Fiscal Year Annual Research Report
Prepation of Generic Oxides Melt Model for Late-Phase Severe Accident Analysis
| Project/Area Number |
26630484
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| Research Institution | Nagaoka University of Technology |
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Principal Investigator |
Do T.M.Dung 長岡技術科学大学, 工学研究科, 助教 (90638420)
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| Co-Investigator(Kenkyū-buntansha) |
小川 徹 長岡技術科学大学, 極限エネルギー密度工学研究センター, 客員教授 (10354672)
SUJATANOND Supam 長岡技術科学大学, 工学研究科, 特任助教 (80726208) [Withdrawn]
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| Project Period (FY) |
2014-04-01 – 2017-03-31
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| Keywords | cesium molybdate / cesium dimolybdate / thermodynamics / vaporization / deposition / SUS304 / severe accident |
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| Outline of Annual Research Achievements |
Vaporization and deposition of Cs2MoO4 and Cs2Mo2O7 on Pt and SUS304 in argon have been studied in detail. Based on the mass loss of Cs2Mo2O7 and the thermodynamics reference data of Cs2MoO4, the enthalpy of vaporization of Cs2Mo2O7 was estimated to be 197 ± 31 kJ/mol.
From Raman spectra and electron probe microanalysis, it could be concluded that there was no any reaction when Cs2MoO4 and Cs2Mo2O7 deposited on Pt.
Mo clusters were found in the oxide SUS304 scale when its were heated with Cs2MoO4; both Cs or Mo were found in the cross-section of SUS304 when its were heated with Cs2Mo2O7 at the temperature higher 1500 K. This suggests that some reactions already happened between Cs2MoO4 or Cs2Mo2O7 and SUS304 at high-temperature.
Based on the obtained data, the pseudo-binary system, Cs2MoO4-MoO3, was thermochemically modeled with Redlich-Kister formulation to form a basis to analyze the high-temperature behavior of Cs2MoO4. The model prediction was compared with the thermogravimetric measurements of Cs2MoO4 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.
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