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Tornado-resisting design speeds of nuclear power plants in China

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Abstract

More and more nuclear power plants are being constructed in China, while the nationwide intensity regions with tornado-resisting design speeds are not specified. With the development of tornado damage investigations, more records of tornado events have been accumulated, which makes it possible to establish the probability distribution model of tornado speed and predict the design wind speeds of nuclear power plants. This paper summarizes the derivation of probability distribution of tornado speed based on the parameters of mean occurrence rate, intensity rating, path length and width. The tornado events in China are introduced, while the geographical distribution of tornadoes is described. The mean occurrence rates for each local region with square of 1° longitude and latitude are obtained by moving average method. The records of tornado events, which experienced post-disaster investigations and scattered in research articles, dissertations and yearbooks, are collected and revaluated. Using the accepted tornado records, both the probability distribution of path area and the joint probability distribution between tornado speed and path area are established. The equivalent speeds corresponding to different annual exceedance probabilities are calculated. The suggestions of intensity regions for tornado-resisting design of NPPs in China are proposed. The uncertainties of design wind speeds are simulated by Monte Carlo simulation method. It is indicated that the most significant impact on the uncertainties of design speeds originates from the variation of equivalent speed.

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Acknowledgements

This work is supported by the National Natural Science Foundation of China (51720105005 and 51878040) and 111 Project of China (B13002). The authors also express their gratitude to the support of the sub-project of National Key R & D Program "Theory and Application of Wind Climate and Design Load for Winter Olympics Venues under Complex Mountain Conditions" (2018YFF0300302-04).

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Authors and Affiliations

  1. School of Civil Engineering, Beijing Jiaotong University, Beijing, 100044, China

    Yuji Tian & Bo Li

  2. School of Civil Engineering, Chongqing University, Chongqing, 400044, China

    Qingshan Yang & Min Liu

  3. Beijing’s Key Laboratory of Structural Wind Engineering and Urban Wind Environment, Beijing, 100044, China

    Yuji Tian, Bo Li & Qingshan Yang

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  1. Yuji Tian
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  2. Bo Li
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  4. Min Liu
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Correspondence to Yuji Tian.

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Tian, Y., Li, B., Yang, Q. et al. Tornado-resisting design speeds of nuclear power plants in China. Nat Hazards 107, 1251–1271 (2021). https://doi.org/10.1007/s11069-021-04627-7

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