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Journal Articles

Oxygen Potentials of Pultonium and Uranium Mixed Oxide

Kato, Masato; Tamura, Tetsuya*; Aono, Shigenori

Proceedings of 11th Symposium on Thermodynamics of Nuclear Materials (STNM-11), P. 81, 2004/00

The oxygen potentials of (Pu $_{0.3}$ U $_{0.7}$ )O $_{2-X}$ were measured by thermogravimetric equilibrium measurement in the range of the temperature from 800 to 1350 in Ar/H $_{2}$ /H $_{2}$ O or He/H $_{2}$ /H $_{2}$ O mixture gas flow. The experimental results of (Pu $_{0.3}$ U $_{0.7}$ )O $_{2-X}$ are in good agree with the other works. The relationship between the partial oxygen pressure (PO $_{2}$ ) and X in MO $_{2-X}$ was analized based on lattice defect theory. The oxygen potential of (Pu $_{0.3}$ U $_{0.7}$ )O $_{2-X}$ was modeled by lattice defect theory using the data of the literature and this work. The resulting equation well reproduces the oxygen potential-temperature data for (Pu $_{0.3}$ U $_{0.7}$ )O $_{2-X}$ .

Journal Articles

Evaluation of Thermodynamic Properties for Pyro-Process and their Significance to the Process

Kobayashi, Tsuguyuki; Vavilov, S.; Myochin, Munetaka

Proceedings of 11th Symposium on Thermodynamics of Nuclear Materials (STNM-11), P. 91, 2004/00

The thermodunamic properties such as the Redox potential, diffusion coefficient, and oxidation rate constant of Pu are evaluated. These properties are used for the fieasibility study of the pyro-process.

Journal Articles

Behaviour of Plutonium Fluorrides in Fluoride Volatility Process

Amamoto, Ippei; Terai, T.*; Sato, Koji

Proceedings of 11th Symposium on Thermodynamics of Nuclear Materials (STNM-11), P. 71, 2004/00

The application of the fluoride volatility process in the reprocessing of fuel from the fast breeder reactor is regarded as one of the economical methods. Plutonium hexafluoride (PuF6), however, reacting with fluorine (F2) and plutonium dioxide (PuO2) as the raw material, is in an unstable condition and tends to remain as a solid compound in the process after decomposing into plutonium tetrafluoride (PuF4). Suitable conditions should be established for the practical use of this process. One of them is to enhance the stability of PuF6. The behaviour of plutonium fluorination and relevant chemical reactions were investigated by referring to sundry literature and by thermodynamic calculation. It was then compared with recent data from laboratory scale experiments for this paper. Results from the theoretical analysis agreed with experimental observation that PuF6 could be formed stably under a high temperature condition (approx.1000 K) with over supply of figher concentration of F2.