Transactions of the Korean Society of Pressure Vessels and Piping (한국압력기기공학회 논문집)
- Volume 10 Issue 1
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- Pages.64-69
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- 2014
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- 1738-8333(pISSN)
DOI QR Code
Improvement of Long-term Creep Life Prediction Method of Gr. 91 steel for VHTR Pressure Vessel
초고온가스로 압력용기용 Gr. 91 강의 장시간 크리프 수명 예측 방법 개선
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Park, Jae-Young
;
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Kim, Woo-Gon
;
- EKAPUTRA, I.M.W. ;
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Kim, Seon-Jin
;
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Kim, Min-Hwan
- Received : 2014.06.13
- Accepted : 2014.07.14
- Published : 2014.07.01
Abstract
Gr. 91 steel is used for the major structural components of Generation-IV reactor systems, such as a very high temperature reactor(VHTR) and sodium-cooled fast reactor(SFR). Since these structures are designed for up to 60 years at elevated temperatures, the prediction of long-term creep life is important for a design application of Gr. 91 steel. In this study, a number of creep rupture data were collected through world-wide literature surveys, and using these data, the long-term creep life was predicted in terms of three methods: the single-C method in Larson-Miller(L-M) parameter, multi-C constant method in the L-M parameter, and a modified method("sinh" equation) in the L-M parameter. The results of the creep-life prediction were compared using the standard deviation of error value, respectively. Modified method proposed by the "sinh" equation revealed better agreement in creep life prediction than the single-C L-M method.
Keywords