Liquefaction Analysis for Lacross Nuclear Power Station.
Abstract
The liquefaction potential of the LaCross site was evaluated for two earthquakes; namely, a safe shutdown earthquake (SSE) with a peak acceleration at the ground surface of 0.12 g, and and SSE with a peak acceleration at the ground surface of 0.2 g. The analysis was made by two methods: the Seed-Idriss Simplified Procedure and an empirical procedure. For a peak acceleration of 0.12 g, liquefaction is predicted by the Seed-Idriss calculations between a depth of 32 and 48 ft, and liquefaction is predicted by the empirical method between a depth of 24 and 35 ft. Assuming a peak acceleration of 0.2 g, the Seed-Idriss Simplified Procedure predicts liquefaction below a depth of 25 ft the empirical method predicts liquefactions between a depth of 25 and 60 ft and between a depth of 85 and 115 ft. The soils below the reactor at the LaCross site are predicted to strain badly, if an SSE which produces 0.12 g at the ground surface occurs; and are predicted to experience excessive strains and liquefaction if the SSE with a peak acceleration of 0.2 g occurs. Because of the limitations in the current state of knowledge concerning liquefactions and because of the limited data for use in this analysis, WES cannot conclude that the reactor vessel foundation is safe if the 0.12g SSE occurs and concludes that the reactor vessel foundation is unsafe if the 0.2 g SSE occurs. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1979
- Accession Number
- ADA072778
Entities
People
- Wayne A. Bieganousky
- William F. Marcuson III