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Research Papers: Seismic Engineering

Study on Minimum Wall Thickness Requirement for Seismic Buckling of Reactor Vessel Based on System Based Code Concept

[+] Author and Article Information
Shigeru Takaya

Japan Atomic Energy Agency,
4002 Narita, O-arai,
Ibaraki 311-1393, Japan
e-mail: takaya.shigeru@jaea.go.jp

Daigo Watanabe

Mitsubishi Heavy Industries, Ltd.,
5-717-1 Fukahori, Nagasaki,
Nagasaki 851-0392, Japan
e-mail: daigo_watanabe@mhi.co.jp

Shinobu Yokoi

Mitsubishi FBR Systems, Inc.,
2-34-17 Jingumae, Shibuya,
Tokyo 150-0001, Japan
e-mail: shinobu_yokoi@mfbr.mhi.co.jp

Yoshio Kamishima

Mitsubishi FBR Systems, Inc.,
2-34-17 Jingumae, Shibuya,
Tokyo 150-0001, Japan
e-mail: yoshio_kamishima@mfbr.mhi.co.jp

Kenichi Kurisaka

Japan Atomic Energy Agency,
4002 Narita, O-arai,
Ibaraki 311-1393, Japan
e-mail: kurisaka.kennichi@jaea.go.jp

Tai Asayama

Japan Atomic Energy Agency,
4002 Narita, O-arai,
Ibaraki 311-1393, Japan
e-mail: asayama.tai@jaea.go.jp

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received January 12, 2014; final manuscript received November 26, 2014; published online February 24, 2015. Assoc. Editor: Spyros A. Karamanos.

J. Pressure Vessel Technol 137(5), 051802 (Oct 01, 2015) (7 pages) Paper No: PVT-14-1003; doi: 10.1115/1.4029322 History: Received January 12, 2014; Revised November 26, 2014; Online February 24, 2015

The minimum wall thickness required to prevent seismic buckling of a reactor vessel (RV) in a fast reactor is derived using the system based code (SBC) concept. One of the key features of SBC concept is margin optimization; to implement this concept, the reliability design method is employed, and the target reliability for seismic buckling of the RV is derived from nuclear plant safety goals. Input data for reliability evaluation, such as distribution type, mean value, and standard deviation of random variables, are also prepared. Seismic hazard is considered to evaluate uncertainty of seismic load. Minimum wall thickness required to achieve the target reliability is evaluated, and is found to be less than that determined from a conventional deterministic design method. Furthermore, the influence of each random variable on the evaluation is investigated, and it is found that the seismic load has a significant impact.

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References

Figures

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Fig. 1

A system event tree to identify seismic core damage sequences [13]

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Fig. 2

Estimated seismic hazard using the uniform hazard spectrum at Tokai No. 2 power station (thickness = 50 mm)

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Fig. 3

Probability distribution of annual maximum seismic ground motion normalized to the design basis earthquake for JSFR (thickness = 50 mm)

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Fig. 4

Seismic ground response spectra (damping coefficient of the soil: 5%) [20]

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Fig. 5

Seismic response analysis model in the horizontal direction [20]

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Fig. 6

Seismic response analysis model in the vertical direction [20]

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Fig. 7

Cumulative probability of normalized yield stress

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Fig. 8

Relationship between wall thickness and annual buckling probability

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