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Tsukada, Takashi; Terakado, Hiroshi; Ebata, Koei; Ueno, Fumiyoshi
no journal, ,
At the Fukushima Daiichi Nuclear Power Plant, nitrogen gas has been injected into the primary containment vessel, PCV to prevent the hydrogen explosion and corrosion of steel materials. It is considered that the oxygen concentration in the nitrogen environment varies in PCV and the inner surface of PCV is exposed to water and gas environment alternately near the water surface position. In this study, therefore, corrosion tests by rotating flat-type specimens in diluted seawater/nitrogen environment with oxygen concentrations of 0%, 1% and 5% were performed to study corrosion behavior of the steel material. Results of the tests at 303 K for 500 hours are discussed from a viewpoint of the effects of oxygen concentration and rotating speed.