Water Chemistry in a Crack Tip under Irradiation, (II) Evaluation of Oxidant Concentration in the Crack Tip
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概要
- 論文の詳細を見る
Under neutron and gamma-ray irradiations, radiolytic species are generated directly in the crack tip, which causes higher oxidant concentrations and subsequently influences crack propagation rate.A crevice radiolysis model was proposed to estimate the oxidant concentrations in the crack tip water under gamma-ray irradiation. Direct generation of radiolytic species in the crevice water, and their secondary generation and disappearance caused by their interaction with the crevice surface as well as species in the crevice water were included in the model. The diffusion of the radiolytic species through the narrow gap from the bulk water to the crack tip and vice versa were also considered.Calculation results confirmed that the concentrations of H2O2, one of the most important oxidants in BWR environments, in both bulk water and crack tip water under irradiation (energy deposition rate: 0.1 W/cm3) were high enough to show high local ECP in both regions under NWC, but were high in the bulk water and low in the crack tip water under HWC. A high H2 diffusion rate from the bulk to the crack tip enhanced the recombination reaction of H2O2 and H2.
- 社団法人 日本原子力学会の論文
- 2003-05-25
著者
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Uchida S
Japan Atomic Energy Agency
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Uchida S
Tohoku Univ. Sendai
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Satoh Y
Quantum Science And Energy Engineering Department Graduate School Of Engineering Tohoku University
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UCHIDA Shunsuke
Department of Bioengineering, Faculty of Engineering, Kagoshima University
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Satoh Yoshiyuki
Department Of Quantum Science And Energy Engineering Graduate School Of Engineering Tohoku Universit
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SATOH Tomonori
Department of Quantum Science and Energy Engineering, Graduate School of Engineering, Tohoku Univers
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Uchida Shunsuke
Department Of Bioengineering Faculty Of Engineering Kagoshima University
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Uchida Shunsuke
Department Of Quantum Science And Energy Engineering Graduate School Of Engineering Tohoku Universit
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Uchida Shunsuke
Power And Industrial Systems R&d Division Hitachi Ltd.
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Uchida Shunsuke
Energy Research Laboratory Hitachi Ltd.
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Satoh Tomonori
Nuclear Science And Engineering Directorate Japan Atomic Energy Agency
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