Synergistic effect of aluminum lactate and sodium molybdate on freshwater corrosion of carbon steel under irradiation

Otani, Kyohei; Kato, Chiaki; Igarashi, Takahiro

Corrosion, 79(11), p.1277 - 1286, 2023/11

https://doi.org/10.5006/4386

Development of laser cutting technology of thick steel plates for nuclear facilities

Tamura, Koji*; Toyama, Shinichi

Nihon Genshiryoku Gakkai-Shi ATOMO, 62(5), p.268 - 271, 2020/05

The laser cutting technology is expected to be a promising candidate for the decommissioning measure of nuclear facilities, because it has a lot of advantage such as its high controllability and excellent suitability to remote handling by robot arm, etcetera. This report describes the recent result from laser cutting technology development for thick steel materials summarizing the cutting demonstration of 300 mm thick steels and dummy pressure vessel, the analysis of cutting condition of thick steel cutting, the observation of cutting process, remote controlled cutting system, the cutting in pile of steels by the system, and countermeasure for fume produce by cutting process.

Rust and corrosion mechanism of carbon steel in dilute chloride solution at low dose rates

Motooka, Takafumi

QST-M-8; QST Takasaki Annual Report 2016, P. 73, 2018/03

https://repo.qst.go.jp/records/73811

Previous corrosion test of carbon steel in dilute artificial seawater under Co-60 -ray irradiation has indicated that corrosion rate was enhanced at absorbed dose rates: 100 Gy/h and rust color was changed from black to dark brown. In the present study, the corrosion mechanism of carbon steel under Co-60 -ray irradiation was investigated by identification of rust. rays enhanced oxidation of iron ions from di-valent to tri-valent. Rust formed under irradiation had higher oxidation state.

Study of corrosion rate of carbon steel in diluted artificial seawater under simulated irradiation condition

Komatsu, Atsushi; Tsukada, Takashi; Ueno, Fumiyoshi; Yamamoto, Masahiro

Proceedings of 23rd International Conference on Nuclear Engineering (ICONE-23) (DVD-ROM), 4 Pages, 2015/05

Effect of oxygen and hydrogen peroxide on corrosion rate of carbon steel in diluted artificial seawater was investigated by electrochemical methods. Diffusion coefficient and thickness of diffusion layer for oxygen and hydrogen peroxide were measured to estimate the diffusion limiting current density. Corrosion tests of carbon steel were also conducted in diluted artificial seawater containing oxygen and/or hydrogen peroxide at 323K. The diffusion coefficient of hydrogen peroxide was about 0.8 times lower than that of oxygen, and the thickness of diffusion layer was almost equivalent between oxygen and hydrogen peroxide. Diffusion limiting current density of hydrogen peroxide was estimated to be 0.4 times lower than that of oxygen in the same concentration at 323K. Plot of corrosion rate with the addition of concentration of oxygen and 0.4 times concentration of hydrogen peroxide showed good correlation.

Report of examination of the ruptured pipe at the Hamaoka Nuclear Power Station Unit-1

JAERI Working Group for Examination of the Ruptured Pipe at Hamaoka-1

JAERI-Tech 2001-094, 60 Pages, 2001/12

JAERI-Tech-2001-094.pdf:13.99MB

no abstracts in English

Report of the 1993 workshop on particle-material interactions for fusion; March 89, 1994, Tokai, Japan

JAERI-Conf 94-004, 187 Pages, 1994/11

JAERI-Conf-94-004.pdf:7.1MB

no abstracts in English

Thermal shock tests on various materials of plasma facing components for FER/ITER

Seki, Masahiro; Akiba, Masato; Araki, Masanori; ; Dairaku, Masayuki; *; Fukaya, Kiyoshi; Ogawa, Masuro; Ise, Hideo*

Fusion Engineering and Design, 15, p.59 - 74, 1991/00

https://doi.org/10.1016/0920-3796(91)80009-4

no abstracts in English

A New gas equilibration method for the measurement of carbon potential; Carbon potential in austenitic 316 stainless steel at 1,000C

; ; ;

Journal of Nuclear Materials, 116(2-3), p.178 - 183, 1983/00

https://doi.org/10.1016/0022-3115(83)90100-9

no abstracts in English

Corrosion mechanisms of carbon steel in the simulated air/solution interface

Otani, Kyohei; Kato, Chiaki

no journal, , 

Cooling water is circulated and injected into the containment vessel (PCV) of Fukushima Daiichi Nuclear Power Station (1F) Units 1-3, and nitrogen gas is injected and filled to prevent hydrogen explosion and to control corrosion of steel materials. In order to maintain the integrity of the PCV facilities over a long period of time until the decommissioning of the reactors, it is necessary to predict the corrosion behavior of carbon steel, which is the main structural material, and in particular to study the factors that may accelerate corrosion. From the internal investigation of the PCV, it was confirmed that carbon steel, which is the material inside the PCV, is exposed to an environment in which the gas and liquid environments alternate near the air/solution interface (Air/solution alternating environment). It has been reported that metallic materials are covered with a thin liquid film near the air/solution interface, and that the corrosion rate of steel is accelerated when there is a thin water film on the steel surface compared to that in solutions. In this presentation, the corrosion test of carbon steel was conducted using a rotating corrosion test apparatus to simulate the air/solution alternating environment inside the 1F PCV, and the corrosion rate and corrosion mechanism of carbon steel obtained from the results of mass measurement, observation and analysis will be presented.