This paper describes a proposal of provisional allowable stress for the welded joints made of modified 9Cr-1Mo steel (ASME Gr.91) applicable to the structural design of Japanese Sodium cooled Fast Reactor (JSFR). For the early commercialization of the SFRs, economic competitiveness is one of the most essential requirements. One of the most practical means to reduce the construction costs is to diminish the total amount of structural materials. To meet the requirements, modified 9Cr-1Mo steel has attractive characteristics as a main structural material of SFRs, because the steel has both excellent thermal properties and high temperature strength. Employing the steel to the main pipe material, remarkable compact plant design can be achieved. There is only one elbow in the hot leg pipe of the primary circuit. However, in such a compact piping, it is difficult to keep enough distance between welded joint and high stress portion. In the welded joints of creep strength enhanced ferritic steels including ASME Gr.91 (modified 9Cr-1Mo) steel, creep strength may obviously degrade especially in long-term region. This phenomenon is known as “Type-IV” damage. Though obvious strength degradation has not observed at 550°C yet for the welded joint made of modified 9Cr-1Mo steel, it is proper to suppose strength degradation must take place in very long-term creep. Therefore, taking strength degradation due to “Type-IV” damage into account, the allowable stress applicable to JSFR pipe design was proposed based on creep rupture test data acquired in temperature accelerated conditions. Available creep rupture test data of welded joints made of modified 9Cr-1Mo steel provided by Japanese steel vender were collected. The database was analyzed by region partition method. The creep rupture data were divided into two regions of short-term and long-term and those were individually evaluated by regression analyses with Larson Miller Parameter (LMP). Boundary condition between short-term and long-term was half of 0.2% proof stress of base metal at corresponding temperature. First order equation of logarithm stress was applied. For conservativeness, allowable stress was proposed provisionally considering design factor for each region. Present design of JSFR hot leg pipe of primary circuit was evaluated using the proposed allowable stress. As a result, it was successfully demonstrated that the compact pipe design was assured. For validation of the provisional allowable stress, a series of long-term creep tests were started. In future, the provisional allowable stress will be properly reexamined when longer creep rupture data are obtained. In addition, some techniques to improve the performance of welded joints were surveyed and introduced.
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ASME 2010 Pressure Vessels and Piping Division/K-PVP Conference
July 18–22, 2010
Bellevue, Washington, USA
Conference Sponsors:
- Pressure Vessels and Piping Division
ISBN:
978-0-7918-4922-4
PROCEEDINGS PAPER
Creep Strength Evaluation of Welded Joint Made of Modified 9Cr-1Mo Steel for Japanese Sodium Cooled Fast Reactor (JSFR) Available to Purchase
Takashi Wakai,
Takashi Wakai
Japan Atomic Energy Agency, Ibaraki, Japan
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Yuji Nagae,
Yuji Nagae
Japan Atomic Energy Agency, Ibaraki, Japan
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Takashi Onizawa,
Takashi Onizawa
Japan Atomic Energy Agency, Ibaraki, Japan
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Satoshi Obara,
Satoshi Obara
Japan Atomic Energy Agency, Ibaraki, Japan
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Yang Xu,
Yang Xu
Mitsubishi FBR Systems, Inc., Tokyo, Japan
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Tomomi Ohtani,
Tomomi Ohtani
Mitsubishi Heavy Industries, Ltd., Hyogo, Japan
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Shingo Date,
Shingo Date
Mistubishi Heavy Industries, Ltd., Hyogo, Japan
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Tai Asayama
Tai Asayama
Japan Atomic Energy Agency, Ibaraki, Japan
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Takashi Wakai
Japan Atomic Energy Agency, Ibaraki, Japan
Yuji Nagae
Japan Atomic Energy Agency, Ibaraki, Japan
Takashi Onizawa
Japan Atomic Energy Agency, Ibaraki, Japan
Satoshi Obara
Japan Atomic Energy Agency, Ibaraki, Japan
Yang Xu
Mitsubishi FBR Systems, Inc., Tokyo, Japan
Tomomi Ohtani
Mitsubishi Heavy Industries, Ltd., Hyogo, Japan
Shingo Date
Mistubishi Heavy Industries, Ltd., Hyogo, Japan
Tai Asayama
Japan Atomic Energy Agency, Ibaraki, Japan
Paper No:
PVP2010-26014, pp. 475-483; 9 pages
Published Online:
January 10, 2011
Citation
Wakai, T, Nagae, Y, Onizawa, T, Obara, S, Xu, Y, Ohtani, T, Date, S, & Asayama, T. "Creep Strength Evaluation of Welded Joint Made of Modified 9Cr-1Mo Steel for Japanese Sodium Cooled Fast Reactor (JSFR)." Proceedings of the ASME 2010 Pressure Vessels and Piping Division/K-PVP Conference. ASME 2010 Pressure Vessels and Piping Conference: Volume 3. Bellevue, Washington, USA. July 18–22, 2010. pp. 475-483. ASME. https://doi.org/10.1115/PVP2010-26014
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