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Wakai, Satoshi*; Hirano, Shinichi*; Ueno, Fumiyoshi; Okamoto, Akihiro*
Zairyo To Kankyo, 70(12), p.491 - 496, 2021/12
After Fukushima Daiichi Nuclear Power Station accident, various corrosion mitigating activities have been treated, and severe corrosion incident have never taken placed. On the other hand, the facilities were exposed sea water, and some of them have continuously exposed to ground water. The exposure of metal materials to environmental water has a risk of microbiologically influenced corrosion (MIC). In this paper, we summarize the latest knowledge of MIC and the task of MIC in the decommissioning of Fukushima Daiichi Nuclear Power Station.
Hirano, Shinichi*; Nagaoka, Toru*; Ise, Kotaro; Amano, Yuki; Matsumoto, Norio*
Zairyo To Kankyo, 64(12), p.535 - 539, 2015/12
To obtain the knowledge about the corrosion ability and its mechanism as a target the soil environment microorganisms, lake mud was cultured with metallic iron. As a result, corrosion of carbon steel was observed with sulfate reduction and methane producing activity in brackish medium with lactate as substrate. Inhibition test of SRB and MPA suggested that SRB plays a major role for this corrosion, and MPA enhanced corrosion activity by the coexistence of SRB.
Yamamoto, Masahiro; Katayama, Hideki*; Sato, Tomonori; Tsukada, Takashi
Proceedings of 2014 Nuclear Plant Chemistry Conference (NPC 2014) (USB Flash Drive), 6 Pages, 2014/10
In the Fukushima Dai-ichi Nuclear Power Plant, seawater and natural river water were poured for emergency cooling. Corrosion of materials was worried because of high chloride ion concentration from seawater. The chloride ion concentration was decreased by de-chlorination operation. However, the water was not treated in the viewpoint of microbial breeding, so that many microbes could be alive and microbially induced corrosion (MIC) was worried. So, we attempted to examine the ability of MIC occurrence by using of corrosion potential analysis. Corrosion potentials of samples rose to about 300 mV nobler than the initial values in the NB added solution. The potentials of the welded samples more easily rose than the simple plate. These potential changes are attributed to the biofilms formed on the sample surface. After about 100 days' immersion, evidence of localized corrosion was not observed. More immersion time is needed to clarify the MIC ability.
Nagaoka, Toru*; Hirano, Shinichi*; Matsumoto, Norio*; Amano, Yuki
no journal, ,
no abstracts in English
Nishimura, Akihiko; Kanai, Akio*; Yoshida, Minoru*
no journal, ,
no abstracts in English
Hirano, Shinichi*; Wakai, Satoshi*; Ueno, Fumiyoshi; Okamoto, Akihiro*
no journal, ,
no abstracts in English
Hirano, Shinichi*; Wakai, Satoshi*; Ueno, Fumiyoshi; Okamoto, Akihiro*
no journal, ,
no abstracts in English
Hirano, Shinichi*; Wakai, Satoshi*; Ueno, Fumiyoshi; Okamoto, Akihiro*
no journal, ,
no abstracts in English
