The Operating Basis Earthquake (OBE) governs the design of many components of a nuclear plant. Probabilistic analyses were performed to determine the OBE for the Koshkonong Nuclear Plant in southern Wisconsin. The area has very sparse seismicity, so the data are quite scattered. Parametric studies indicated the effects of different recurrence rates, attneuation laws, and maximum epicentral intensitics. An OBE of intensity VI (Modified Mercalli) with a corresponding peak acceleration of 0.06g is justified. A simple analysis of the probability of recurrence of an event shows that multiple occurrences have significant probabilities when the return period of the earthquake is close to the life of the plant. The present OBE has an expected return period of about 1,000 yr; for very conservative assumptions, the return period is a few hundred years. /ASCE/

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  • Supplemental Notes:
    • This paper was presented at the October 17-21, 1977, ASCE Annual Convention, Exposition and Continuing Education Program, held at San Francisco, California.
  • Corporate Authors:

    American Society of Civil Engineers

    345 East 47th Street
    New York, NY  United States  10017-2398
  • Authors:
    • Christian, J T
    • Borjeson, R W
    • Tringale, P T
  • Publication Date: 1978-7

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Filing Info

  • Accession Number: 00179312
  • Record Type: Publication
  • Report/Paper Numbers: ASCE 13904 Proceeding
  • Files: TRIS
  • Created Date: Sep 14 1978 12:00AM