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MoO
, in severe accident conditions, 1; Partitioning of Cs and Mo among gaseous speciesDo, Thi Mai Dung*; Sujatanond, S.*; Ogawa, Toru
Journal of Nuclear Science and Technology, 55(3), p.348 - 355, 2018/03
Times Cited Count：6 Percentile：52.79(Nuclear Science & Technology)In order to better understand the behavior of cesium in the severe accident of the LWR, the high-temperature chemistry of CsMoO in HO+H gas was studied. The pseudo-binary system, CsMoO-MoO
, was thermochemically modeled with Redlich-Kister formulation to form a basis to analyze the high-temperature behavior of CsMoO. The model prediction was compared with the thermogravimetric measurements of CsMoO 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.
Lam, Do Van*; Do, Thi Mai Dung*; Ogawa, Toru
Journal of Nuclear Science and Technology, 54(7), p.784 - 794, 2017/07
Times Cited Count：1 Percentile：10.62(Nuclear Science & Technology)In order to clarify the Zr-rich corner of the Zr-N-O ternary system, a series of nitridation and controlled low-pressure oxidation heatings were made on zirconium metal. Low-partial pressures of oxygen were obtained by using a redox couple of either Mo/MoO or CuO/CuO. The heated samples were characterized by X-ray diffraction (XRD), optical microscopy and electron probe micro analysis (EPMA). Experimental results were coupled with a preliminary thermodynamic analysis with a sublattice formalism to draw a provisional ternary isotherm at 1373 K.
Matsumoto, Yoshinobu*; Do, Thi-Mai-Dung*; Inoue, Masao; Nagaishi, Ryuji; Ogawa, Toru
Journal of Nuclear Science and Technology, 52(10), p.1303 - 1307, 2015/10
Times Cited Count：4 Percentile：33.25(Nuclear Science & Technology)Effects of zirconium oxides and oxidation products of zircaloy-4 on water radiolysis were investigated to predict the hydrogen generation from the water-immersed debris after a severe accident of a nuclear power plant. Observed yields of hydrogen in water containing the oxides were measured as a function of their weight fractions. Assuming that energies of Co-60 
-ray deposited to water and the oxides brought about the water radiolysis to generate hydrogen independently, the radiolysis showed an additional term of hydrogen generation due to the energy deposition to the oxides. This term seemed to be dependent on the specific surface area or particle size of oxides, but not on the crystal structure of oxides in our experimental results. The oxides in distilled water gave the strong enhancement of term. The enhancement tended to saturate with increasing the weight fraction of oxides and was not apparent in the seawater.
Sato, Yuma*; Do, Thi Mai Dung*; Suzuki, Masahide*; Yamada, Tomonori
no journal, ,
no abstracts in English
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 
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 CsMoO (g) with steam was better described by taking into account the participation of CsMoO
.
Nhut, V. L.*; Do, Thi Mai Dung*; Murakami, Kenta*; Suzuki, Masahide*; Yamada, Tomonori; Shibata, Takuya
no journal, ,
Miradji, F.; Suzuki, Eriko; Nishioka, Shunichiro; Suzuki, Chikashi; Nakajima, Kunihisa; Oishi, Yuji*; Muta, Hiroaki*; Kurosaki, Ken*; Do, Thi Mai Dung*; Osaka, Masahiko
no journal, ,
150
C temperature rangeDo, Thi-Mai-Dung*; Nhut, V. L.*; Murakami, Kenta*; Suematsu, Hisayuki*; Nakajima, Kunihisa; Nishioka, Shunichiro; Suzuki, Eriko; Miradji, F.; Osaka, Masahiko
no journal, ,
The interaction between CsMoO with concrete within the temperature range of 600150C in Ar gas is studied. It seems that there is no reaction between CsMoO aerosol particles with concrete at these temperatures. However, because of the hygroscopic property, CsMoO aerosol particles change to the liquid phase and quickly diffused inside the concrete bulk.
SiO
Do, Thi Mai Dung*; Ngarayana, I.*; Nguyen, H. D.*; Murakami, Kenta*; Suematsu, Hisayuki*; Koide, Manabu*; Nakajima, Kunihisa; Suzuki, Eriko; Osaka, Masahiko
no journal, ,
CsSiO powder was synthesized by wet method using cesium carbonate powder and colloidal silica 40 wt.% suspension in HO as starting materials. The characteristic of CsSiO is investigated by using X-ray diffraction, Raman and Thermogravimetry-differential scanning calorimetry. The structure of CsSiO was analyzed by Transmission Electron Microscope.
