Hydrazine and Hydrogen Co-injection to Mitigate Stress Corrosion Cracking of Structural Materials in Boiling Water Reactors (V) Effects of Hydrazine and Dissolved Oxygen on Flow Accelerated Corrosion of Carbon Steel
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概要
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Hydrazine and hydrogen co-injection into reactor water via the feed water line can mitigate stress corrosion cracking in BWRs. The effects of water quality variation due to hydrazine injection on flow accelerated corrosion (FAC) of carbon steel used in the BWR feed water line should be considered from the viewpoints of radioactive exposure, radioactive waste generation and plant integrity. Optimization of oxygen injection into feed water was considered to suppress FAC during hydrazine and hydrogen co-injection. In this report, corrosion tests of carbon steel were made in hydrazine and/or dissolved oxygen injected solutions (conditions: no pH adjustment by ammonia; temperature = 215°C; flow rate = 3.5 m·s−1) to study the effects of dissolved oxygen and hydrazine on FAC. Hydrazine and oxygen co-injection suppressed the total corrosion rate by about 1/5 compared with the case of 0 μmol·kg−1 hydrazine and <0.06 μmol·kg−1 oxygen injection. With hydrazine and oxygen co-injection, the inner layer, which is protective oxide, was close packed. Thickness of the inner layer also became larger compared with the case for only hydrazine injection or only oxygen injection. α-Fe2O3, which is thermodynamically more stable than Fe3O4, was formed in addition to Fe3O4 which was the single species formed for the case of only hydrazine injection. From these results, it was concluded FAC will be suppressed by keeping the oxygen concentration at the current level in BWRs (about 1 μmol·kg−1) if hydrazine and hydrogen co-injection is applied.
- 社団法人 日本原子力学会の論文
- 2007-02-25
著者
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Fuse Motomasa
Hitachi Works, Hitachi-GE Nuclear Energy, Ltd.
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Wada Y
Energy And Environmental Systems Laboratory Hitachi Ltd.
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Wada Yoichi
Power And Industrial Systems R& D Division Hitachi Ltd.
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Fuse Motomasa
Hitachi Works Hitachi-ge Nuclear Energy Ltd.
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Fuse Motomasa
Power Systems Nuclear Engineering And Product Division Hitachi-ge Nuclear Energy Ltd.
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Wada Yoichi
Energy And Environmental Systems Lab. Hitachi Ltd.
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Wada Yoichi
Energy And Environmental Systems Laboratory Hitachi Ltd.
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Ishigure Kenkichi
Quantum Science And Energy Engineering Department Graduate School Of Engineering Tohoku University
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Ishigure K
Department Of Quantum Engineering And Systems Science The University Of Tokyo
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Wada Yoichi
Power And Industrial Systems R&d Laboratory Hitachi Ltd.
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Kadoi Eiichi
The Japan Atomic Power Co.
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TACHIBANA Masahiko
Power and Industrial Systems R&D Laboratory, Hitachi, Ltd.
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ISHIDA Kazushige
Power and Industrial Systems R&D Laboratory, Hitachi, Ltd.
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AIZAWA Motohiro
Hitachi-GE Nuclear Energy, Ltd.
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TAKIGUCHI Hideki
The Japan Atomic Power Co.
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AIZAWA Motohiro
Power Systems, Hitachi Works, Hitachi, Ltd.
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Iinuma Kouichi
Department Of Quantum Science And Energy Engineering Graduate School Of Engineering Tohoku Universit
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Fuse Motomasa
Hitachi-ge Nuclear Energy Ltd.
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Ishida Kazushige
Power And Industrial Systems R&d Laboratory Hitachi Ltd.
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Tachibana Masahiko
Energy And Environmental Systems Laboratory Hitachi Ltd.
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Aizawa Motohiro
Hitachi-ge Nuclear Energy Ltd.
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Ishida Kazushige
Energy And Environmental Systems Laboratory Hitachi Ltd.
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Ishida Kazushige
Power & Industrial Systems R&d Laboratory Hitachi Ltd.
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Wada Yoichi
Power & Industrial Systems R&d Laboratory Hitachi Ltd.
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