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Kitayama, Ayami; Nagata, Shuhei*; Inoue, Hiroyuki*; Dobashi, Ryuta*
no journal, ,
no abstracts in English
Hata, Kuniki; Sato, Tomonori; Inoue, Hiroyuki*; Taguchi, Mitsumasa*; Seito, Hajime*; Kaji, Yoshiyuki
no journal, ,
no abstracts in English
Sato, Tomonori; Hata, Kuniki; Kaji, Yoshiyuki; Inoue, Hiroyuki*; Taguchi, Mitsumasa*; Seito, Hajime*; Tada, Eiji*; Abe, Hiroshi*; Akiyama, Eiji*
no journal, ,
Water radiolysis calculations were performed to evaluate corrosion environments under irradiation by using database of corrosion under irradiation. It was confirmed that the dissolved oxygen is one of major factors to determine the generation of hydrogen peroxide, and the concentration of hydrogen peroxide could be controlled by the control of dissolved oxygen concentration. As a result of the calculation for the water radiolysis including impurities, the effects of Cl
on water radiolysis is negligible at concentration less than 10
mol/L. The effects of Br is negligible at concentration less than 10
mol/L. The effects of HCO
is negligible at concentration less than 10
mol/L.
Otani, Kyohei; Tsukada, Takashi; Ueno, Fumiyoshi; Kato, Chiaki
no journal, ,
It was reported that the corrosion rate of carbon steel was accelerated under the air/solution alternating condition. In this presentation, it is investigated that the effect of oxygen concentration on the corrosion rate of steel under the air/solution alternating condition. As a result, the corrosion rate of carbon steel under the air/solution alternating condition did not increase linearly with increasing oxygen concentration in the air, and the slope in the low concentration range (0-5%) is greater than in the high concentration range (5-20.8%). This suggests that the corrosion rate may be accelerated around the air/solution interface on the inner surface of the PCV if even a small amount of oxygen is introduced into the PCV during the debris removal process.
Soma, Yasutaka
no journal, ,
Commemorative speech for "The Award of JSCE for young researcher" of Japan Society of Corrosion Engineering on May 21st 2020, entitled "Characterization of the mechanism of localized corrosion in the crevices of stainless steel in high-temperature, high-purity water" will be made. In this study, we conducted followings: (i) Corrosion test of Type 316L stainless steel to analyze susceptibility to localized corrosion within a crevice in 561K high purity water, and (ii) Develop a sensor system to measure the solution conductivity in a crevice and study relationship between crevice water chemistry and the localized corrosion. These studies were done for the purpose of clarifying the mechanism of stress corrosion cracking (SCC). It was shown that Type-316L stainless steel is susceptible to intergranular corrosion inside the crevice. The developed sensors detected very high solution conductivity in the vicinity of the intergranular corroded area indicate highly corrosive environments were formed in crevice with small gaps. This system can be applied to clarify the mechanism of corrosion related failure, such as SCC, and is expected to contribute to the safety improvement of nuclear reactors.