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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

 Times Cited Count:4 Percentile:56.63(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.

Journal Articles

Determination of optimal vapor pressure data by the second and third law methods

Nakajima, Kunihisa

Mass Spectrometry (Internet), 5(2), p.S0055_1 - S0055_6, 2016/12

Though equilibrium vapor pressures are utilized to determine thermodynamic properties of not only gaseous species but also condensed phases, the obtained data often disagree by a factor of 100 and more. A new data analysis method is proposed using the so-called second and third law procedures to improve accuracy of vapor pressure measurements. It was found from examination of vapor pressures of cesium metaborate and silver that the analysis of the difference between the second and third law values can result in determination of an optimal data set. Since the new thermodynamic method does not require special techniques and or experiences in dealing with measured data, it is reliable and versatile to improve the accuracy of vapor pressure evaluation.

JAEA Reports

Development of measurement technique of the equilibrium vapor pressure of simulated fission products

Takai, Toshihide; Nakajima, Kunihisa; Furukawa, Tomohiro

JAEA-Technology 2015-002, 20 Pages, 2015/03

JAEA-Technology-2015-002.pdf:3.46MB

To improve the evaluation technique of source term, the measurement technique of the equilibrium vapor pressure using a high temperature mass spectrometer is required to expand the thermodynamic database of the simulated FPs. Existing test apparatus was adapted for this purpose. A mass spectrometer capable of measuring a wide mass number range and glove box for handling simulated FPs were installed for analyzing heavy FPs and preventing deterioration of simulated FPs in an air atmosphere, respectively. Function verification using standard sample and precision investigation using simulated FP sample were carried out. The oxygen dissociation pressure and standard enthalpy of formation of RuO$$_{2}$$(s) were evaluated, and it was confirmed these evaluated values were agreed with the calculated value from existing thermodynamic data and evaluation value written in the literature. Consequently, it was proven that high precision thermodynamic data was able to obtain by using this apparatus.

Journal Articles

Experimental investigation of lead-bismuth evaporation behavior

Ohno, Shuji*; Miyahara, Shinya*; Kurata, Yuji

Journal of Nuclear Science and Technology, 42(7), p.593 - 599, 2005/07

no abstracts in English

Journal Articles

Distillation of cadmium from uranium-plutonium-cadmium alloy

Kato, Tetsuya*; Iizuka, Masatoshi*; Inoue, Tadashi*; Iwai, Takashi; Arai, Yasuo

Journal of Nuclear Materials, 340(2-3), p.259 - 265, 2005/04

 Times Cited Count:22 Percentile:82.13(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Experimental investigation of evaporation behavior for lead-bismuth eutectic and its impurity tellurium

Ohno, Shuji*; Miyahara, Shinya*; Kurata, Yuji

Proceedings of 12th International Conference on Nuclear Engineering (ICONE-12) (CD-ROM), 6 Pages, 2004/00

no abstracts in English

JAEA Reports

Study of prediction of fission product behaviours in severe accident; Scoping experiment and basic findings of Cs, Ba and Sr

*; J.Huang*; *; *; *; Yamaguchi, Kenji*; Sugimoto, Jun

JAERI-Tech 98-003, 32 Pages, 1998/02

JAERI-Tech-98-003.pdf:1.12MB

no abstracts in English

JAEA Reports

Proposal of safety design methodologies for an HTGR-hydrogen production system; Mainly on countermeasures against fire and explosion

Nishihara, Tetsuo; Hada, Kazuhiko; Shiozawa, Shusaku

JAERI-Research 97-022, 110 Pages, 1997/03

JAERI-Research-97-022.pdf:4.1MB

no abstracts in English

JAEA Reports

Study of film boiling collapse behavior during vapor explosion

*; *; *; *; Yamano, N.; Sugimoto, Jun

JAERI-Research 96-032, 152 Pages, 1996/06

JAERI-Research-96-032.pdf:4.05MB

no abstracts in English

Journal Articles

Numerical simulation of strong evaporation and condensation for plasma-facing materials

Kunugi, Tomoaki; *

Fusion Engineering and Design, 28, p.162 - 169, 1995/00

 Times Cited Count:1 Percentile:18.1(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Vaporization behaviour of (Pu,Am)N

Ogawa, Toru; Omichi, Toshihiko; Maeda, Atsushi; Arai, Yasuo;

Journal of Alloys and Compounds, 224, p.55 - 59, 1995/00

 Times Cited Count:23 Percentile:79.68(Chemistry, Physical)

no abstracts in English

Journal Articles

Thermodynamic properties of Th$$_{0}$$$$_{.}$$$$_{8}$$$$_{0}$$U$$_{0}$$$$_{.}$$$$_{2}$$$$_{0}$$O$$_{2}$$$$_{+}$$$$_{x}$$ solid solution

Ugajin, Mitsuhiro; ; Shiba, Koreyuki

Journal of Nuclear Materials, 116(2-3), p.172 - 177, 1983/00

 Times Cited Count:14 Percentile:80.69(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

The nickel-iodine-sulfur process for thermochemical hydrogen production, III; Equilibrium vapor pressure over nickel(II) iodide hydrates

Shimizu, Saburo; ; Nakajima, Hayato; Ikezoe, Yasumasa;

Denki Kagaku Oyobi Kogyo Butsuri Kagaku, 50(11), p.904 - 908, 1982/00

no abstracts in English

Oral presentation

Recent Knudsen effusion mass spectrometric study at Japan Atomic Energy Agency; Thermodynamic study of gaseous CsBO$$_{2}$$

Nakajima, Kunihisa

no journal, , 

Results on the thermodynamic study of gaseous CsBO$$_{2}$$ will be presented as a keynote speech of the 64th annual conference on Mass Spectrometry. Gaseous cesium metaborate, CsBO$$_{2}$$(g), is predicted to be the main cesium vapor species in severe light water reactor accidents according to the thermodynamic analysis, which treats chemical reactions with B$$_{4}$$C. But quality of the thermodynamic data of CsBO$$_{2}$$(g) used in this thermodynamic analysis is regarded as poor. Thus, Knudsen-effusion mass-spectrometric measurement of CsBO$$_{2}$$ was performed to obtain reliable thermodynamic quantities of CsBO$$_{2}$$(g). The standard enthalpy values of formation of CsBO$$_{2}$$(g), $$Delta$$$$_{f}$$${it H}$ $$_{298}$$$$^{circ}$$ (CsBO$$_{2}$$,g), were obtained by the second and third law treatments and found to be -700.7$$pm$$10.7kJ/mol and -697.0$$pm$$10.6kJ/mol. These two values agree within the error limits and the evaluated thermodynamic data of CsBO$$_{2}$$(g) are considered to be reliable.

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