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irradiationYukawa, Takuji*; Inoue, Hiroyuki*; Kojima, Takao*; Iwase, Akihiro*; Taniguchi, Naoki; Tachikawa, Hirokazu*
Zairyo To Kankyo 2016 Koenshu (CD-ROM), p.359 - 362, 2016/05
The immersion tests of pure titanium were carried out in aqueous solution containing carbonate/bicarbonate with 50 mM-chloride ion under gamma irradiation. The effect of pH on general corrosion rate of titanium were studied. The experimental results showed that the concentration of hydrogen preoxide was increased with pH, and the corrosion rate increased with the hydrogen preoxide concentration. The corrosion rate in pH12 and 13 were 5 to10 times larger than those under unirradiated conditions.
Yamamoto, Masahiro
Zairyo To Kankyo 2016 Koenshu (CD-ROM), p.1 - 8, 2016/05
I will make a presentation for "Go Okamoto Memorial Lecture" at coming Zairyo to Kankyo 2016 Symposium. I will introduce the data analysis method using reproducing experiment for an actual environment. The examples will be shown in case of maritime structure and nuclear engineering plant.
Motooka, Takafumi
no journal, ,
Relation of the corrosion rate of carbon steel in irradiating dilute artificial seawater and the dose rate was investigated by corrosion tests using Co-60 source in the atmospheric condition, quantitative analysis of test solutions and identification of rusts. The corrosion rate of carbon steel was increased with the increase of dose rate of dilute artificial seawater. Hydrogen peroxide formed by water radiolysis controlled the corrosion rate of carbon steel. The oxidation of Fe 
by oxidizing species formed by water radiolysis affected the rust formation process of the carbon steel.
Igarashi, Takahiro; Irisawa, Eriko; Kato, Chiaki; Ueno, Fumiyoshi; Abe, Hitoshi
no journal, ,
It is known that existence of oxidizing metal ion in boiling nitric acid solution makes stainless steel more corrosive. In this study, in order to elucidate chemical species which promote oxidization of Vanadium(IV) ion, we conducted Redox reaction simulation in nitric acid solution using chemical reaction model. The results showed that nitrous acid and nitrogen dioxide affected oxidization of Vanadium(IV) ion, and rate constant of nitrogen dioxide was larger than that of nitrous acid.
Irisawa, Eriko; Suzuki, Kazunori*; Kumagai, Mikio*; Kato, Chiaki; Ueno, Fumiyoshi; Abe, Hitoshi
no journal, ,
For the corrosion of stainless steels in the nitric acid solution containing oxidizing metallic ions, it is important factor that the relation between re-oxidation of metallic ions which is reduced with the corrosion reaction and the redox reaction of nitric acid. To make clear the effect of nitrogen oxides formed from nitric acid on oxidation behavior of tetravalent vanadium, changing of concentrations of nitrogen oxide discharged to gas phase from solution and nitrous acid in solution during oxidation reaction of vanadium were measured. The results showed that the nitrogen dioxide acted as oxidant on the oxidation reaction of vanadium.
Nemoto, Yoshiyuki; Kaji, Yoshiyuki; Ogawa, Chihiro; Nakashima, Kazuo*; Tojo, Masayuki*; Kanazawa, Toru*; Goto, Daisuke*
no journal, ,
In order to investigate the air oxidation behavior of cladding materials for study on improvement of safety in spent fuel pool loss of coolant accident condition, both isothermal oxidation tests by short length specimens and oxidation tests with temperature gradient by long length specimens were conducted and the knowledge on influence of temperature and air flow rate on cladding oxidation behavior was obtained in this study.