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Ueno, Fumiyoshi
Zairyo To Kankyo, 68(1), p.2 - 8, 2019/01
It is important to control the cooling water of light water reactors (boiling water reactor and pressurized water reactor) to suitable quality in order to reduce corrosion of structural materials and generation of radioactive corrosion products. For that purpose, monitoring of water quality using electrochemical measurement method is necessary. In this article, the application of ECP measurement to BWR is mainly focused, I describe the water quality of light water reactors and the necessity of electrochemical measurement.
Shirai, Osamu*; Yamana, Hajimu*; Arai, Yasuo
Journal of Alloys and Compounds, 408-412, p.1267 - 1273, 2006/02
Times Cited Count：41 Percentile：84.47(Chemistry, Physical)no abstracts in English
Arai, Yasuo; Ogawa, Toru
Kaku Nenryo, p.33_9 - 33_10, 2000/06
no abstracts in English
particles in borosilicate glass meltsNagai, Takayuki; Inose, Takehiko*; Sato, Seiichi*; Hatakeyama, Kiyoshi*; Seki, Katsumi*
no journal, ,
no abstracts in English
Yoshizawa, Reina*; Sugawara, Toshifumi*; Aritani, Hirofumi*; Shimada, Akihiko; Idesaki, Akira; Hakoda, Teruyuki; Sugimoto, Masaki; Yoshikawa, Masahito
no journal, ,
Carbon material which is manufactured after high temperature treatment of polymer is one of the candidates for the alternative of platinum cathode catalyst of polymer electrolyte fuel cell. In this study, we examine the influence of potential of oxygen reduction reaction by adding metal including material to polymer, precursor of carbon material. Specifically, 95 wt% of carboxymethyl cellulose (CMC) and 5 wt% of phthalocyanine (Pc) including metal or Pc were mixed. Adding water to this, the mixture of Pc-CMC were prepared. The mixture was irradiated by electron beam up to 100 kGy, dried and treated at 800 degree for 1 h in Ar gas. Then carbon material was manufactured. This was measured by electrochemical measurement. Then oxygen reduction reaction potential was calculated. The carbon material, CMC with Pc including Co has higher potential of 0.1 V than that with Pc including other metal or Pc. This phenomenon is the almost same as that manufactured by other polymer than CMC. It is estimated that Co is contributed to higher potential of oxygen reduction reaction.
Nagai, Takayuki; Kobayashi, Hidekazu; Okamoto, Yoshihiro; Inose, Takehiko*; Sato, Seiichi*; Hatakeyama, Kiyoshi*; Seki, Katsumi*
no journal, ,
no abstracts in English
Tsukada, Takashi; Kita, Satoshi; Ueno, Fumiyoshi
no journal, ,
Corrosion behavior of steel materials such as mild steel or low alloy steel in water environment has been examined by corrosion tests immersing specimens statically to test solution. However, in the actual plant environment, conditions of water flow or alternating exposure to water/air are dynamically affecting the corrosion behavior. In this study, therefore, corrosion tests by rotating flat-type specimens in the diluted seawater/air environment were performed and effects of water flow and alternating exposure on corrosion of the steels were examined. Results of the rotating corrosion tests in 200 times diluted seawater saturated with dissolved oxygen at 30
C for 500 hours will be presented and discussed in the presentation.
meltNagai, Takayuki; Okamoto, Yoshihiro; Inose, Takehiko*; Akiyama, Daisuke*; Sato, Nobuaki*
no journal, ,
A supplied high level liquid waste into the glass melter is formed to the mixed nitrate salt after the dehydration. In this study, NaNO which is a main ingredient in the waste was selected by the solvent, and NaNO sample including Ru was prepared, and the redox behavior of Ru in NaNO melt was measured by the Cyclic Voltammetry. And valence of Ru included in solidified salt was estimated by the synchrotron XAFS measurement.
) solution-NaNO-Glass frit by XAFS measurementNagai, Takayuki; Kobayashi, Hidekazu; Okamoto, Yoshihiro; Akiyama, Daisuke*; Sato, Nobuaki*
no journal, ,
no abstracts in English
Nagai, Takayuki; Kaneko, Koji; Motokawa, Ryuhei; Okamoto, Yoshihiro; Haga, Yoshinori; Kobayashi, Hiromi*; Homma, Masanobu*; Hatakeyama, Kiyoshi*; Hirono, Kazuya*
no journal, ,
no abstracts in English
Akashi, Shin; Shibata, Hiroki; Sato, Takumi; Hayashi, Hirokazu
no journal, ,
no abstracts in English
Nagai, Takayuki; Kaneko, Koji; Motokawa, Ryuhei; Okamoto, Yoshihiro; Haga, Yoshinori
no journal, ,
no abstracts in English
Soma, Yasutaka; Komatsu, Atsushi; Kato, Chiaki
no journal, ,
Electrochemical environment within a crevice which is referred to as crevice (or crack) water chemistry is an important factor for understanding stress corrosion cracking (SCC) of stainless steels in high temperature water. There have been many studies and well-organized reviews on the crevice water chemistry. However, the measurement of the real-time behavior of crevice water chemistry as a function of potential (electrochemical potential, ECP) remains a major challenge. In this study, the in situ measurement of the electrical conductivity of the solution inside crevices, 
was carried out to analyzed -ECP relationship.
