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Hirooka, Shun; Murakami, Tatsutoshi; Nelson, A. T.*; McClellan, K. J.*
INL/EXT-14-33515, p.34 - 36, 2014/10
Collaborative study has been done on the properties of nuclear materials between the DOE and Japan and the oxygen potential of (U,Ce)O was measured in this year. Experimental measurements of the oxygen potential were conducted on Ce=20% and 30% composition rates simulating Pu content in advanced MOX fuel in JAEA by gas equilibrium method where oxygen partial pressure in the atmosphere was controlled with mixing dry/wet Ar/H gas. More than 100 data points were obtained in the O/M range of 1.945 2.000 at 1200C, 1400C and 1600C. The experimental results were analyzed by the defect analysis and analytical equations were obtained to calculate O/M as functions of temperature and oxygen potential. From the comparison with that of (U,Pu)O, applicability of the same defect chemistry and S-style curve are common. Also, it is revealed that (U,Ce)O requires evidently higher oxygen potential for the O/M.
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JNC TN9400 2000-029, 87 Pages, 1999/11
The second Power-To-Melt (PTM) test, PTM-2, was performed in the experimental fast reactor "JOYO". AIl of the twenty-four fuel pins of the irradiation vehicle, B5D-2, for the PTM-2 test, were provided for post-irradiation-experiment (PIE) to evaluate the PTM values. ln this study, the PIE technique for PTM test was established and the PTM results were evaluated. The findings are as follows: (1) The maximum fuel-melting ratio on the transverse section was 10.7%, and was within the limit of fuel-melting in this PTM test enough. Unexpected fuel-melting amount to a ratio of 11.8% was found at 24 mm below the peak power elevation in a test fuel pin, lt is possible that this arose from secondary fuel-melting. (2) Combination of metallographical observation with X-ray microanalysis of plutonium distribution was very effective for the identification of once-molten fuel zone. (3) The PTM evaluation suggested that dependence of the PTM on the fuel pellet density was stronger than that of previous foreign PTM tests, while the dependence on the pellet-cladding gap and the oxygen-to-metal ratio was indistinctly. The dependence on the cladding temperature and the fill gas composition was not shown as well.
Matsumoto, Taku; Kato, Masato; Morimoto, Kyoichi; Sunaoshi, Takeo*
no journal, ,
The oxygen potentials of (UPuAm)O were measured as a function of oxygen to metal ratio (O/M) in the temperature range from 1673 to 1873 K by the gas equilibrium method using thermogravimetry. The measured oxygen potentials were analyzed by the point defect chemistry method. From this analysis, the oxygen potential of (UPuAm)O was represented as a function of O/M ratio and temperature.
Kamei, Miho; Naganuma, Masayuki; Ikusawa, Yoshihisa; Maeda, Koji; Sasaki, Shinji; Ozawa, Takayuki; Hirooka, Shun
no journal, ,
no abstracts in English