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Journal Articles

Influence of Zn injection on PWSCC crack growth rates and oxide film properties of Alloy 600

Chimi, Yasuhiro; Sato, Kenji*; Kasahara, Shigeki; Umehara, Ryuji*; Hanawa, Satoshi

Proceedings of Contribution of Materials Investigations and Operating Experience to Light Water NPPs' Safety, Performance and Reliability (FONTEVRAUD-9) (Internet), 10 Pages, 2018/09

To investigate the influence of Zinc (Zn) injection on primary water stress corrosion cracking (PWSCC) growth behavior, crack growth tests of 10% cold-worked Alloy 600 were performed in simulated primary water environment of pressurized water reactor (PWR) at 320$$^{circ}$$C with a low-concentration (5-10 ppb) Zn injection under dissolved hydrogen (DH) conditions of 5, 30, and 50 cc/kgH$$_{2}$$O. As a result of the crack growth tests, DH-dependence of crack growth rate (CGR) showed a similar tendency to the predicted CGR based on the CGR data without Zn injection, indicating almost no effect of a low-concentration Zn injection on the crack growth behavior. Moreover, the microstructural analyses of oxide films formed inside the crack and on the specimen surface were conducted, and the intake of Zn in the oxides was detected on the specimen surface, but not detected inside the crack. This result was considered to be the cause of no Zn injection effect on the crack growth behavior.

Journal Articles

A Modelling study on water radiolysis for primary coolant in PWR

Mukai, Satoru*; Umehara, Ryuji*; Hanawa, Satoshi; Kasahara, Shigeki; Nishiyama, Yutaka

Proceedings of 20th International Conference on Water Chemistry of Nuclear Reactor Systems (NPC 2016) (USB Flash Drive), 9 Pages, 2016/10

In Japanese PWR, the concentration of dissolved hydrogen in the primary coolant is controlled in the range from 25 cc/kg-H$$_{2}$$O to 35 cc/kg-H$$_{2}$$O for suppression of water decomposition. However this concentration is desired to reduce for the purpose of radiation source reduction in Japan. So, the concentration due to water radiolysis in primary coolant was evaluated at lower hydrogen concentration by the water radiolysis model in consideration of $$gamma$$ ray, fast neutron and alpha ray due to the reaction $$^{10}$$B(n,$$alpha$$)$$^{7}$$Li. The results of evaluation showed that the water radiolysis was suppressed even if the hydrogen concentration was decreased to 5 cc/kg-H$$_{2}$$O. The effects of the different G-value and the rate constants of major reaction on the concentration of H$$_{2}$$O$$_{2}$$ and O$$_{2}$$ were studied under hydrogen addition. We also focused on the effect of the alpha radiolysis in boron acid water.

Oral presentation

The Radiation control for the decontamination and recovery of high concentration radioactive residue in the waste storage tank

Arakawa, Yuto; Fujii, Katsutoshi; Mimura, Ryuji; Nakashio, Nobuyuki; Onuma, Isamu; Shishido, Nobuhito; Umehara, Takashi

no journal, , 

no abstracts in English

Oral presentation

Effect of mixed phosphate corrosion inhibitor on corrosion of PCV steel in diluted sea water

Fujii, Kazumi*; Iwanami, Masaru*; Ishioka, Shinichi*; Kaneko, Tetsuji*; Tanaka, Norihiko*; Kawaharada, Yoshiyuki*; Yokoyama, Yutaka*; Umehara, Ryuji*; Kato, Chiaki; Ueno, Fumiyoshi; et al.

no journal, , 

no abstracts in English

Oral presentation

Effect of tungstate inhibitor and molybdate-containing mixed phosphate-based inhibitor on corrosion of PCV steel in diluted sea water

Kaneko, Tetsuji*; Tanaka, Norihiko*; Kawaharada, Yoshiyuki*; Fujii, Kazumi*; Iwanami, Masaru*; Ishioka, Shinichi*; Yokoyama, Yutaka*; Umehara, Ryuji*; Kato, Chiaki; Ueno, Fumiyoshi; et al.

no journal, , 

no abstracts in English

Oral presentation

Effect of $$gamma$$-ray irradiation on inhibition of steel corrosion in diluted sea water

Sato, Tomonori; Kato, Chiaki; Motooka, Takafumi; Ueno, Fumiyoshi; Nakano, Junichi; Kaneko, Tetsuji*; Tanaka, Norihiko*; Kawaharada, Yoshiyuki*; Fujii, Kazumi*; Iwanami, Masaru*; et al.

no journal, , 

no abstracts in English

Oral presentation

Corrosion behavior of reactor core spray pipe steel in flowing water, 2

Yokoyama, Yutaka*; Umehara, Ryuji*; Tanaka, Norihiko*; Kawaharada, Yoshiyuki*; Kaneko, Tetsuji*; Fujii, Kazumi*; Iwanami, Masaru*; Ishioka, Shinichi*; Kato, Chiaki; Ueno, Fumiyoshi; et al.

no journal, , 

no abstracts in English

Oral presentation

Effect of tungstate inhibitor and molybdate-containing mixed phosphate-based inhibitor on corrosion of PCV steel in diluted sea water, 2

Kaneko, Tetsuji*; Tanaka, Norihiko*; Kawaharada, Yoshiyuki*; Fujii, Kazumi*; Iwanami, Masaru*; Ishioka, Shinichi*; Yokoyama, Yutaka*; Umehara, Ryuji*; Kato, Chiaki; Ueno, Fumiyoshi; et al.

no journal, , 

no abstracts in English

Oral presentation

Effect of mixed phosphate corrosion inhibitor on corrosion of PCV steel in diluted sea water, 2

Fujii, Kazumi*; Iwanami, Masaru*; Ishioka, Shinichi*; Kaneko, Tetsuji*; Tanaka, Norihiko*; Kawaharada, Yoshiyuki*; Yokoyama, Yutaka*; Umehara, Ryuji*; Kato, Chiaki; Ueno, Fumiyoshi; et al.

no journal, , 

no abstracts in English

Oral presentation

Effect of later added inhibitors of the steel corrosion in the diluted artificial seawater under $$gamma$$-ray irradiation

Kato, Chiaki; Sato, Tomonori; Ueno, Fumiyoshi; Kaneko, Tetsuji*; Tanaka, Norihiko*; Kawaharada, Yoshiyuki*; Fujii, Kazumi*; Iwanami, Masaru*; Ishioka, Shinichi*; Yokoyama, Yutaka*; et al.

no journal, , 

no abstracts in English

Oral presentation

Evaluation of effect of corrosion inhibitors on reactor core spray pipe steel in flowing diluted sea water

Yokoyama, Yutaka*; Umehara, Ryuji*; Kaneko, Tetsuji*; Tanaka, Norihiko*; Kawaharada, Yoshiyuki*; Fujii, Kazumi*; Iwanami, Masaru*; Ishioka, Shinichi*; Kato, Chiaki; Ueno, Fumiyoshi; et al.

no journal, , 

no abstracts in English

Oral presentation

Influence of Zn injection on PWSCC crack growth rates of alloy 600 under simulated primary coolant environments of pressurized water reactor

Chimi, Yasuhiro; Sato, Kenji*; Kasahara, Shigeki; Umehara, Ryuji*; Hata, Kuniki; Hanawa, Satoshi; Nishiyama, Yutaka

no journal, , 

To investigate the influence of Zinc (Zn) injection on primary water stress corrosion cracking (PWSCC) growth behavior, crack growth tests of 10% cold-worked Alloy 600 in simulated primary water environment of pressurized water reactor (PWR) at 320$$^{circ}$$C and 360$$^{circ}$$C, with and without Zn injection, under dissolved hydrogen (DH) conditions of 5, 30, and 50 cc/kgH$$_{2}$$O. As a result of the crack growth tests at 360$$^{circ}$$C, it is implied that Zn injection suppresses the oxidation inside the crack and the crack growth rate (CGR). From the crack growth tests at 320$$^{circ}$$C with Zn injection, DH-dependence of CGR showed a similar tendency to the predicted CGR based on the CGR data without Zn injection. Obvious influence of Zn injection on DH-dependence of CGR at 320$$^{circ}$$C was not observed in the present study.

Oral presentation

Application experiences of water chemistry standards and request for its revision, 1; Exchange of opinions for utilization and revision of water chemistry standards

Hanawa, Satoshi; Kawamura, Hirotaka*; Akamine, Hiroshi*; Shoda, Yasuhiko*; Nagase, Makoto*; Umehara, Ryuji*

no journal, , 

no abstracts in English

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