Effects of Hydrogen Peroxide on Radioactive Cobalt Deposition on Stainless Steel Surface in High Temperature Water
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概要
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In order to understand the effects of hydrogen peroxide on 60Co deposition under water chemistry conditions of boiling water reactors, deposition amounts of 60Co on the stainless steel specimens were measured by changing hydrogen peroxide (H2O2) and oxygen (O2) concentrations in a high temperature water loop, and correlations between the nature of oxide film on the specimen surface and its deposition were examined by separating the contributions of inner and outer oxide layers to the deposition. The results are summarized as follows.(1) The weight change of the specimens and the amount of 60Co deposition were strongly affected by the presence of H2O2. Weight gain of the specimens exposed to various H2O2 concentrations after a 200-h pre-exposure to 200 ppb H2O2 was less than 2 μg/cm2 for 1,000 h; this was caused by protection effects of thin and dense oxide film.(2) The amount of 60Co deposition on the specimen exposed to 200 ppb H2O2 was much less than the amounts of those exposed to 10, 5 and 0 ppb H2O2 in the water with 50 ppb H2, but in the case of 200 h-pre-exposure to 200 ppb H2O2, the latter specimens had deposition amounts as low as that of the specimen exposed to 200 ppb H2O2.(3) The amount of 60Co deposition had a fairly linear correlation with the amount of outer oxide layer, except in the case of specimens exposed to the condition without H2O2 from the first. In the latter case, 60Co was expected to be included in a Cr-rich inner oxide layer.
- 社団法人 日本原子力学会の論文
- 2005-01-25
著者
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UCHIDA Shunsuke
The Institute of Applied Energy
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Uchida S
Japan Atomic Energy Agency
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Uchida S
Tohoku Univ. Sendai
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Fuse Motomasa
Power Systems Nuclear Engineering And Product Division Hitachi-ge Nuclear Energy Ltd.
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UCHIDA Shunsuke
Department of Bioengineering, Faculty of Engineering, Kagoshima University
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HOSOKAWA Hideyuki
Power and Industrial Systems R&D Laboratory, Hitachi, Ltd.
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USUI Naoshi
Power Systems, Nuclear Engineering and Product Division, Hitachi-GE Nuclear Energy, Ltd.
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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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Hosokawa Hideyuki
Power And Industrial Systems R&d Laboratory Hitachi Ltd.
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Usui Naoshi
Power Systems Nuclear Engineering And Product Division Hitachi-ge Nuclear Energy Ltd.
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