Reference temperature evaluation method by Master Curve approach for the fracture toughness evaluation had been standardized recently in Japan, and expected to be a powerful tool to ensure the reliability of long term used RPV steels. In order to get sufficient number of data for the Master curve approach coexistent with the present surveillance program for RPVs, the utilization of miniature specimens, which can be taken from broken halves of surveillance Charpy specimens, is important. CRIEPI had developed the test technique for the miniature C(T) specimens (Mini-CT), whose dimensions are 4 × 10 × 10 mm, and verified the basic applicability of Master Curve approach by means of Mini-CT for the determination of fracture toughness of typical Japanese RPV steels. A round robin program is organized with the participation of Japanese academia, industries and a government institute. The program aims to verify the reliability and robustness of experimental data of Mini-CT, and to pick out further investigation items to be solved before the actual application of the technique. As the first step of this program, four institutes separately carried out a series of Master Curve evaluation in conformity to ASTM E1921-10e1 by means of Mini-CT specimens, whose material (Japanese RPV material, SFVQ1A), machining process and pre-cracking process are in common in all the specimens. Valid reference temperature T0 could be successfully obtained in all of the institutes by means of Mini-CT specimen. However, the value, T0, have large difference with maximum of 34 °C among the institutes. The difference shows strong correlation with the difference in loading rate, which is selected by each organization to be meet the testing standard ASTM E1921-10e1.
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ASME 2012 Pressure Vessels and Piping Conference
July 15–19, 2012
Toronto, Ontario, Canada
Conference Sponsors:
- Pressure Vessels and Piping Division
ISBN:
978-0-7918-5505-8
PROCEEDINGS PAPER
A Round Robin Program of Master Curve Evaluation Using Miniature C(T) Specimens: First Round Robin Test on Uniform Specimens of Reactor Pressure Vessel Material
Masato Yamamoto,
Masato Yamamoto
CRIEPI, Yokosuka, Kanagawa, Japan
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Akihiko Kimura,
Akihiko Kimura
Kyoto University, Uji, Kyoto, Japan
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Kentaro Yoshimoto,
Kentaro Yoshimoto
Mitsubishi Heavy Industry, Takasago, Hyogo, Japan
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Takuya Ogawa,
Takuya Ogawa
Toshiba Corporation, Yokohama, Kanagawa, Japan
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Atsushi Chiba,
Atsushi Chiba
Hitachi GE Nuclear Energy, Hitachi, Ibaraki, Japan
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Takashi Hirano,
Takashi Hirano
IHI, Yokohama, Kanagawa, Japan
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Takuji Sugihara,
Takuji Sugihara
Nuclear Development, Tokai, Ibaraki, Japan
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Masanari Sugiyama,
Masanari Sugiyama
Nippon Nuclear Fuel Development, Oarai, Ibaraki, Japan
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Naoki Miura,
Naoki Miura
CRIEPI, Yokosuka, Kanagawa, Japan
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Naoki Soneda
Naoki Soneda
CRIEPI, Yokosuka, Kanagawa, Japan
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Masato Yamamoto
CRIEPI, Yokosuka, Kanagawa, Japan
Akihiko Kimura
Kyoto University, Uji, Kyoto, Japan
Kunio Onizawa
JAEA, Tokai, Ibaraki, Japan
Kentaro Yoshimoto
Mitsubishi Heavy Industry, Takasago, Hyogo, Japan
Takuya Ogawa
Toshiba Corporation, Yokohama, Kanagawa, Japan
Atsushi Chiba
Hitachi GE Nuclear Energy, Hitachi, Ibaraki, Japan
Takashi Hirano
IHI, Yokohama, Kanagawa, Japan
Takuji Sugihara
Nuclear Development, Tokai, Ibaraki, Japan
Masanari Sugiyama
Nippon Nuclear Fuel Development, Oarai, Ibaraki, Japan
Naoki Miura
CRIEPI, Yokosuka, Kanagawa, Japan
Naoki Soneda
CRIEPI, Yokosuka, Kanagawa, Japan
Paper No:
PVP2012-78661, pp. 73-79; 7 pages
Published Online:
August 8, 2013
Citation
Yamamoto, M, Kimura, A, Onizawa, K, Yoshimoto, K, Ogawa, T, Chiba, A, Hirano, T, Sugihara, T, Sugiyama, M, Miura, N, & Soneda, N. "A Round Robin Program of Master Curve Evaluation Using Miniature C(T) Specimens: First Round Robin Test on Uniform Specimens of Reactor Pressure Vessel Material." Proceedings of the ASME 2012 Pressure Vessels and Piping Conference. Volume 6: Materials and Fabrication, Parts A and B. Toronto, Ontario, Canada. July 15–19, 2012. pp. 73-79. ASME. https://doi.org/10.1115/PVP2012-78661
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