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Ishijima, Yasuhiro; Kato, Chiaki; Motooka, Takafumi; Yamamoto, Masahiro; Kano, Yoichi*; Ebina, Tetsunari*
Materials Transactions, 54(6), p.1001 - 1005, 2013/06
Times Cited Count：7 Percentile：39.23(Materials Science, Multidisciplinary)Zirconium has been utilized in nuclear fuel reprocessing plants because of its superior corrosion resistance in nitric acid solutions. However, stress corrosion cracking (SCC) susceptibility of zirconium has been reported in boiling nitric acid solutions at the passivity breakdown potential. However, it has not been clear the SCC initiation and propagation behavior of zirconium. In this study, to clarify the SCC initiation and propagation behavior of zirconium, constant load tensile tests were carried out in boiling nitric acid solutions. From the results, many cracks were initiated under the oxide film and maximum crack led to rupture in the potentials that nobler than passivity breakdown potential. These results showed that the SCC of zirconium in boiling nitric acid solutions is due to the oxide formation. And this SCC behavior suggests that the SCC behavior of zirconium can be attributed to tarnish rupture model.
; Kano, Shigeki; Tachi, Yoshiaki; Kawai, Masataka *
JNC TN9410 2000-013, 89 Pages, 2000/09
JNC-TN9410-2000-013.pdf:5.28MB
Lithium is one of goodcoolants because of high boiling point (1317
C), small specific gravity (0.47 at 600C) and large specific heat (1cal/g/C). Therefore if lithium will be used in fast reactor for coolant, the heat efficiency of reactor will largely increase. Here the fundamental properties of lithium and the results of examination on chemical reaction, combustion and extinction are shown. These examinations were also carried out on sodium to compare with lithium. The differences between both are that lithium reacts more moderately with water, not explosive, and is not combustible but after ignition burns at higher temperature and longer.
Koizumi, Masumichi; Kashima, Sadamitsu; *; *; *; *; *; *
PNC TN841 78-16, 44 Pages, 1978/02
no abstracts in English
Ishijima, Yasuhiro; Motooka, Takafumi; Kato, Chiaki; Yamamoto, Masahiro; Kano, Yoichi*; Ebina, Tetsunari*
no journal, ,
Zirconium has been utilized in reprocessing plant because of its superior corrosion resistance. But Stress corrosion cracking (SCC) susceptibility had been reported in some conditions. In order to clarify the SCC occurrence criteria of Zr in boiling nitric acid solution, constant load tests at potentiostatic condition were conducted. From the results, SCC of Zr in nitric acid solution occurred only at transpassive region. From the observation of intermediate samples, many cracks initiate under oxide film and then the maximum crack grown to rupture. If the reprocessing plant operates in the potential of passivity region, SCC of Zr will not occur.
Ishijima, Yasuhiro; Motooka, Takafumi; Kato, Chiaki; Yamamoto, Masahiro; Kano, Yoichi*; Ebina, Tetsunari*
no journal, ,
Zirconium has been utilized in reprocessing plant because of its superior corrosion resistance. But stress corrosion cracking (SCC) susceptibility had been reported in some conditions. In order to clarify the SCC occurrence criteria of Zr in boiling nitric acid solution, constant load tests at potentiostatic condition were conducted. From the results, SCC of Zr in nitric acid solution occurred only at transpassive region. And it is attributes to tarnish rupture model. From the observation of intermediate samples, many cracks initiate under oxide film and then the maximum crack has grown to rupture. If the reprocessing plant operates in the potential of passivity region, SCC of Zr will not occur.
Koido, Yoshimitsu*; Tanase, Atsushi*; Kano, Takashi*; Kojima, Satoru*; Sasao, Eiji; Shikano, Kanji*; Kizawa, Yoshikazu*
no journal, ,
In this presentation, the concept and background of newly compiled geological map of Gifu Prefecture. This new map will be published as a digital form and accessed through Web.
Tanase, Atsushi*; Koido, Yoshimitsu*; Oba, Tetsuya*; Kano, Takashi*; Kojima, Satoru*; Sasao, Eiji; Shikano, Kanji*; Kizawa, Yoshikazu*
no journal, ,
In this presentation, the concept and background of newly compiled geological map of Gifu Prefecture. This new map is utilized on a Web-GIS form through PC network. In this presentation, this system is demonstrated.
