Weldability of Neutron-Irradiated Stainless Steel and Nickel-Base Alloy.
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- KOYABU Ken
- Tokyo Electric Power Company
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- ASANO Kyoichi
- Tokyo Electric Power Company
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- TAKAHASHI Hidenori
- Toshiba Corporation Power System & Services Company
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- SAKAMOTO Hiroshi
- Toshiba Corporation Power System & Services Company
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- KAWANO Shohei
- Toshiba Corporation Power System & Services Company
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- NAKAMURA Tomomi
- Hitachi, Ltd.
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- HASHIMOTO Tsuneyuki
- Hitachi, Ltd.
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- KOSHIISHI Masato
- Hitachi, Ltd.
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- KATO Takahiko
- Hitachi, Ltd.
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- KATSURA Ryoei
- Hitachi, Ltd.
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- NISHIMURA Seiji
- Nippon Nuclear Fuel Development CO., Ltd
Bibliographic Information
- Other Title
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- 中性子照射を受けたステンレス鋼およびニッケル基合金の溶接性について
- チュウセイシ ショウシャ オ ウケタ ステンレス コウ オヨビ ニッケルキ ゴウキン ノ ヨウセツセイ ニ ツイテ
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Abstract
Degradation of weldability caused by helium, which is generated by nuclear transmutation in neutron irradiated material, is an important issue to be addressed in planning of proactive maintenance of light water reactor core internal components. In this work, the weldability of neutron-irradiated stainless steel and nickel-base alloy, which are major constituting materials for components, was practically evaluated. The weldability was first examined by TIG welding in relation to the weld heat input and helium content using various specimens (made of SUS304 and SUS316L) sampled from reactor internal components. The specimens were neutron irradiated in a boiling water reactor to fluences from 4 × 1024 to 1.4 × 1026 n/m2 (E>1 MeV), and resulting helium generation ranged from 0.1 to 103 appm. The weld defects were characterized by dye penetrant test and cross-sectional metallography. The weldability of neutron-irradiated stainless steel was shown to be better at lower weld heat input and lower helium content. To evaluate mechanical properties of welded joints, thick plates (20 mm) specimens of SUS304 and Alloy 600 were prepared and irradiated in Japan Material Test Reactor (JMTR). The helium content of the specimens was controlled to range from 0.11 to 1.34 appm selected to determine threshold helium content to weld successfully. The welded joints had multiple passes by TIG welding process at 10 and 20 kJ/cm heat input. The welded joints of thick plate were characterized by dye penetrant test, cross-sectional metallography, tensile test, side bend test and root bend test. It was shown that irradiated stainless steel containing below 0.14 appm of helium could be welded with conventional TIG welding process (heat input below 20 kJ/cm). Nickel-base alloy, which contained as much helium as stainless steel could be welded successfully, could also be welded with conventional TIG welding process. These results served as basis to evaluate the applicability of repair welding to actual reactor components.
Journal
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- QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY
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QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY 18 (4), 606-616, 2000
JAPAN WELDING SOCIETY
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Keywords
Details 詳細情報について
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- CRID
- 1390001204724422656
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- NII Article ID
- 130003934587
- 110003422047
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- NII Book ID
- AN1005067X
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- COI
- 1:CAS:528:DC%2BD3MXhtVagsQ%3D%3D
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- ISSN
- 24348252
- 02884771
- http://id.crossref.org/issn/02884771
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- NDL BIB ID
- 5557352
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed