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Minimum Number of Input Ground-motions to Assess Seismic Performance of Nuclear Facilities

원전시설의 내진성능평가를 위한 입력지반운동의 최소개수

  • Received : 2016.04.19
  • Accepted : 2016.08.09
  • Published : 2016.09.01

Abstract

Currently, researches are being actively conducted in assessing seismic performance of nuclear facilities in USA and Europe. In particular, applying this technique of assessing seismic performance to design of isolation systems in nuclear power plants is being performed and then ASCE 4 Draft (2013) is being revised accordingly in the United States. In order to satisfy the probabilistic performance objectives described by seismic responses with certain confidence levels (ASCE 43, 2005), the probability distributions of these responses have to be defined. What is the minimum number of input ground-motions to obtain the probability distribution precise enough to represent the unknown actual distribution? Theoretical basis, for how to determine the minimum number of input ground-motions for given a logarithmic standard deviation to approximate the unknown actual median of the log-normal distribution within a range of error at a certain level of confidence, is introduced by Huang et al. (2008). However, the relationship between the level of confidence and the range of error is not stated in the previous study. In this paper, based on careful reviews on the previous work, the relationship between the level of confidence and the range of error is logically and explicitly stated. Furthermore, this relationship is also applied to derive the minimum number of input ground-motions in order to approximate the unknown actual logarithmic standard deviation. Several recommendations are made for determining the minimum number of input ground-motions in probabilistic assessment on seismic performance of facilities in nuclear power plants.

Keywords

Seismic performance;Number of samples;Input ground-motion;Probability distribution;Nuclear facility

References

  1. American Society of Civil Engineers (ASCE). Seismic analysis of safety-related nuclear structures and commentary. ASCE 4 Draft. c2013.
  2. American Society of Civil Engineers (ASCE). Seismic Design Criteria for Structures, Systems, and Components in Nuclear Facilities. ASCE 43-05. c2005.
  3. Huang YN, Whittaker AS, Luco N. Performance Assessment of Conventional and Base-Isolated Nuclear Power Plants for Earthquake and Blast Loadings, Technical Report MCEER-08-0019. c2008.
  4. Stone CJ. A Course in Probability and Statistics. Duxbury Press. 1995.
  5. Applied Technology Council (ATC). Guidelines for seismic performance assessment of buildings. ATC-58 35% Draft. Applied Technology Council, Redwood City, California. c2007.
  6. Hamburger RO. A vision of the ATC-58 Project. development of performance-based seismic guidelines. Proceedings of Programming Workshop on Performance-Based Design, Applied Technology Council. Redwood City, California. c2003.

Acknowledgement

Supported by : 한국에너지기술평가원