Thermodynamic study of gaseous CsBO by Knudsen effusion mass spectrometry

Nakajima, Kunihisa; Takai, Toshihide; Furukawa, Tomohiro; Osaka, Masahiko

Journal of Nuclear Materials, 491, p.183 - 189, 2017/08

https://doi.org/10.1016/j.jnucmat.2017.05.001

One of the main chemical forms of cesium in the gas phase during severe accidents of light water reactor is expected to be cesium metaborate, CsBO, by thermodynamic equilibrium calculation considering reaction with boron. But accuracy of the thermodynamic data of gaseous metaborate, CsBO(g), has been judged as poor quality. Thus, Knudsen effusion mass spectrometric measurement of CsBO was carried out to obtain reliable thermodynamic data. The evaluated values of standard enthalpy of formation of CsBO(g), H(CsBO,g), by the 2nd and 3rd law treatments are -700.710.7 kJ/mol and -697.010.6 kJ/mol, respectively, and agree with each other within the errors, which suggests our data are reliable. Further, it was found that the existing data of the Gibbs energy function and the standard enthalpy of formation agreed well with the values evaluated in this study, which indicates the existing thermodynamic data are also reliable.

Vapor species evolved from LiTiO heated at high temperature under various conditions

Hoshino, Tsuyoshi; Yasumoto, Masaru*; Tsuchiya, Kunihiko; Hayashi, Kimio; Nishimura, Hidetoshi*; Suzuki, Akihiro*; Terai, Takayuki*

Fusion Engineering and Design, 81(1-7), p.555 - 559, 2006/02

https://doi.org/10.1016/j.fusengdes.2005.10.004

no abstracts in English

The development of mass balance estimation code; The development and the analyzed example with object type code(I)

;

JNC TN9400 2000-034, 48 Pages, 2000/03

JNC-TN9400-2000-034.pdf:1.56MB

The study and the development to put FBR (Fast Breeder Reactor) to practical use have been doing. So many kinds of technologies are investigated to construct nuclear fuel recycle received to the society. The most important aim of reprocessing has been to extract U and Pu from spent fuels effectively, but, now, the demands for reprocessing are many kinds on nuclear fuel recycle system's construction. These need to be accepted sufficiently. The system that consists of electrolysis, extraction, with molten salt and melting metal, volatilization and condensation using the difference of vapor pressure is suggested, because, differently from LWR (Light Water Reactor), FBR can use the low decontamination factor's fuel. When the engineering scale plant is designed, the dry reprocessing has unsolved problems(ex. process flow) because of less demonstrative scale plants of the dry reprocessing than ones of the wet reprocessing. So the analysis and the estimation of mass balance that is most fundamental in the dry reprocessing system's design need to keep up with the system's alteration (to add new processes etc.) flexibly. This study aim is to develop the mass balance estimation code of dry reprocessing that satisfies the demand mentioned above.

Vaporization properties of SrUO and BaUO in atmospheres simulating accident conditions

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

Journal of Nuclear Materials, 248, p.257 - 261, 1997/00

https://doi.org/10.1016/S0022-3115(97)00202-X

no abstracts in English

Mass spectrometric investigation of the vapor over the LnCl-KCl equimolar melt (Ln=Nd,Er) at high temperatures

*; *; Hashimoto, Masashi; Kudo, Hiroshi

Bulletin of the Chemical Society of Japan, 69(2), p.353 - 357, 1996/00

https://doi.org/10.1246/bcsj.69.353

no abstracts in English

Research on actinide mononitride fuel

Arai, Yasuo; ; Handa, Nuneo

Global 1995, Int. Conf. on Evaluation of Emerging Nuclear Fuel Cycle Systems,Vol. 1, 0, p.538 - 545, 1995/00

no abstracts in English

Vaporization behavior of plutonium-zirconium binary alloy

Maeda, Atsushi; ; Okamoto, Yoshihiro; Omichi, Toshihiko

Journal of Alloys and Compounds, 205, p.35 - 38, 1994/00

https://doi.org/10.1016/0925-8388(94)90761-7

no abstracts in English

Water Adsorption on Lithium Oxide Pellets in Helium Sweep Gas Stream

; Konishi, Satoshi; ; Kurasawa, T.; ; Katsuta, Hiroji; ; Naruse, Yuji

JAERI-M 82-194, 47 Pages, 1982/12

JAERI-M-82-194.pdf:1.44MB

no abstracts in English

Corrosion of AISI316 and AISI304 Stainless Steel with Iodine Vapour

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JAERI-M 5946, 24 Pages, 1975/01

JAERI-M-5946.pdf:1.07MB

no abstracts in English

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

Takai, Toshihide; Nakajima, Kunihisa; Furukawa, Tomohiro; Osaka, Masahiko

no journal, , 

Improvement of the serve accident analysis code is important to evaluate the distribution of the released fission products (FPs) in the reactor more precisely from the view point of both the removal preparation of the fuel debris in the Fukushima Daiichi Nuclear Power Station and improved source term evaluation. The development of the calculation model, which can evaluate the effect of atmosphere and the chemical reaction between the released FPs and control rod material (BC) at elevated temperature, is important for this purpose. The measurement technique of the equilibrium vapor pressure using a high temperature mass spectrometer was under development to expand the thermodynamic database of the simulated FPs, because the chemical equilibrium analysis plays an important role to clarify the effect of chemical reactions. In this study, the apparatus was developed for the equilibrium vapor pressure measurements, and then the reliability of measurement results was evaluated.