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Journal Articles

Radiolysis of mixed solutions of Cl$$^{-}$$ and Br$$^{-}$$ and its effect on corrosion of a low-alloy steel

Hata, Kuniki; Inoue, Hiroyuki*; Kojima, Takao*; Kasahara, Shigeki; Hanawa, Satoshi; Ueno, Fumiyoshi; Tsukada, Takashi; Iwase, Akihiro*

Proceedings of Symposium on Water Chemistry and Corrosion in Nuclear Power Plants in Asia 2017 (AWC 2017) (USB Flash Drive), p.304 - 314, 2017/09

A model simulation of $$gamma$$ radiolysis of mixed solutions of NaCl and NaBr was carried out. The simulation result agreed well with the experimental result, and Br$$^{-}$$ played an important role in determining the amounts of products from water radiolysis. The simulation result also showed that, in highly pure NaCl solutions, the steady-state concentration of a radolytic product, H$$_{2}$$O$$_{2}$$, was mainly controlled by three reactions (Cl$$^{-}$$ + $$^{.}$$OH $$rightarrow$$ ClOH$$^{.-}$$, ClOH$$^{.-}$$ $$rightarrow$$ Cl$$^{-}$$ + $$^{.}$$OH, and ClOH$$^{.-}$$ + H$$^{+}$$ $$rightarrow$$ Cl$$^{.}$$ + H$$_{2}$$O), which indicated that accurate evaluation of the rate constants of these reactions was very important in improving the radiolysis simulation of solutions containing Cl$$^{-}$$. An immersion test using a low-alloy steel, SQV2A, in the mixed solutions was also carried out under irradiation. The corrosion rate increased or decreased depending on the pH or the concentrations of the halide ions in a similar way to the change in concentration of H$$_{2}$$O$$_{2}$$ produced from water radiolysis, which is affected by the presence of Cl$$^{-}$$ and Br$$^{-}$$. However, at high pH values ($$>$$12), the corrosion rate was almost zero even though the concentration of H$$_{2}$$O$$_{2}$$ was high. This could be attributed to enhancement of the passivity of test specimens at higher pH values.

Journal Articles

Hydrogen peroxide production by $$gamma$$ radiolysis of sodium chloride solutions containing a small amount of bromide ion

Hata, Kuniki; Inoue, Hiroyuki*; Kojima, Takao*; Iwase, Akihiro*; Kasahara, Shigeki; Hanawa, Satoshi; Ueno, Fumiyoshi; Tsukada, Takashi

Nuclear Technology, 193(3), p.434 - 443, 2016/03

https://doi.org/10.13182/NT15-32
 Times Cited Count：13 Percentile：77.16(Nuclear Science & Technology)

JAEA Reports

Evaluation of thermal displacement behavior of high temperature piping system in power-up test of HTTR, 1; Results up to 20MW operation

Hanawa, Satoshi; Kojima, Takao; Sumita, Junya; Tachibana, Yukio

JAERI-Tech 2002-024, 46 Pages, 2002/03

JAERI-Tech-2002-024.pdf:3.29MB

no abstracts in English

Journal Articles

Tensile and bending properties of C/C composite for future HTGR control rod

Tachibana, Yukio; Kojima, Takao; Hanawa, Satoshi; Ishihara, Masahiro

Proceedings of 7th Annual International Conference on Composites Engineering (ICCE-7), p.841 - 842, 2000/00

no abstracts in English

Oral presentation

Development of cooling hopper for high heat generating MOX powder

Murakami, Tatsutoshi; Shibanuma, Kimikazu; Hanawa, Yukio; Yamaki, Takao; Suzuki, Mitsuru; Aono, Shigenori

no journal, , 

MOX powder containing organic additives is loaded in a hopper. The hopper has a cooling function to mitigate heat deterioration of organic additives, but its cooling may not be enough for higher order plutonium in the future. So temperature measurement of MOX powder in the hopper was carried out as a preliminarily test for development of cooling hopper.

Oral presentation

Study on irradiation effects on component materials of electrochemical corrosion potential sensors

Chimi, Yasuhiro; Hanawa, Satoshi; Nishiyama, Yutaka; Nakamura, Takehiko; Tahara, Yuki*; Kojima, Takao*; Inoue, Hiroyuki*; Iwase, Akihiro*

no journal, , 

In order to understand irradiation effects on measurement of electrochemical corrosion potential (ECP), we have investigated the irradiation effects on component materials of zirconia membrane type ECP sensors. In the present report, we will present the change in properties of yttria(Y$$_{2}$$O$$_{3}$$)-stabilized zirconia(ZrO$$_{2}$$) (YSZ), which is used as the membrane, irradiated with energetic heavy ions. After irradiation with 200-MeV Xe ions up to 1$$times$$10$$^{14}$$ ions/cm$$^{2}$$ at room temperature, the lattice parameter of YSZ specimens increases beyond about 0.5% of initial value. Micro-Vickers hardness of the specimens also increases with ion fluence. Considering the damage in YSZ by Xe-ion irradiation (about 0.2 dpa maximum), in case of in-core use of zirconia membrane type ECP sensors, neutron irradiation can affect the durability of a junction between YSZ and metal housing in the sensors.

Oral presentation

Flexible fuel cycle R&D for the smooth FBR deployment, 19; Evaluation of uranium removal technology

Fukasawa, Tetsuo*; Hoshino, Kuniyoshi*; Hanawa, Takao*; Oikawa, Hideki*; Akabori, Mitsuo; Takano, Masahide; Sato, Seichi*; Shimazu, Yoichiro*

no journal, , 

no abstracts in English

Oral presentation

Effects of radiolysis of solutions containing seawater constituents on corrosion of low-alloyed steels

Hata, Kuniki; Kasahara, Shigeki; Hanawa, Satoshi; Ueno, Fumiyoshi; Tsukada, Takashi; Inoue, Hiroyuki*; Kojima, Takao*; Iwase, Akihiro*

no journal, , 

no abstracts in English

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