Irradiation Assisted Mechanical Cracking on Cladding Tubes of Control Rods in Nuclear Reactors
スポンサーリンク
概要
- 論文の詳細を見る
The tips of the rodlets of rod cluster control assemblies(RCCAs) are exposed to extremely high neutron fluence in fuel assemblies. A high neutron fluence causes degradation of the control rod materials. In a pressurized water reactor(PWR) plant, increases in the outer diameters of the rodlets, induced by absorber swelling, and intergranular cracks at tips of rodlets were observed. First, mechanisms of cracking by material degradation due to neutron irradiation in nuclear reactors were given their definitions because they were previously not clearly defined. Then it was confirmed that the cause of intergranular cracks of RCCA rodlets was irradiation assisted mechanical cracking(IAMC). The cracks were induced by an increase in hoop strain due to the swelling of the absorber and a decrease in elongation due to neutron irradiation. Furthermore, investigations were carried out on the swelling mandrel test, because the structures and environments of the swelling mandrel test were similar to those of RCCA rodlets. As a result, it was found that the mechanism of the swelling mandrel test was not irradiation assisted stress corrosion cracking(IASCC) but IAMC. Also, intergranular cracks on the cladding tubes of RCCA rodlets could be induced at a very low strain rate.
- 一般社団法人日本機械学会の論文
- 1999-07-15
著者
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Yonezawa Toshio
Takasago R&d Center Mitsubishi Heavy Industries Ltd.
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Shiraishi Shinichi
Kobe Shipyard & Machinery Works Mitsubishi Heavy Industries Ltd.
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Nakamura Kazuhiro
The Graduate School Of Information Science Nara Institute Of Science And Technology
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Nakamura Kazuhiro
Takasago Research & Development Center, Mitsubishi Heavy Industries, Ltd.
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Matsuoka Takanori
Experiment Department, Nuclear Development Corporation
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Nakamura K
Takasago Research & Development Center Mitsubishi Heavy Industries Ltd.
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YAMAGUCHI Youichirou
Experiment Department, Nuclear Development Corporation
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FUKUDA Riyou
Kobe Shipyard and Machinery Works, Mitsubishi Heavy Industries, Ltd.
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Moriki Toshiaki
Department Of Tumor Surgery Kochi Medical School
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Fukuda Riyou
Kobe Shipyard And Machinery Works Mitsubishi Heavy Industries Ltd.
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Shiraishi S
Inkjet Pinter And Photo Product Design Department Seiko Epson Corporation
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MATSUOKA Takanori
Nuclear Development Corporation
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YAMAGUCHI Youichirou
Nuclear Development Corporation
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Matsuoka Takanori
Department Of Gastroenterology And Hepatology Kochi Medical School
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