Effect of local soil conditions on site amplification

Conference · Fri Feb 18 04:00:00 EST 1983

OSTI ID:5935830

Chen, J C; Bernreuter, D L; Johnson, J J

The Seismic Safety Margins Research Program (SSMRP) is developing a complete fully coupled analysis procedure (including methods and computer codes) for estimating the risk of an earthquake-induced radioactive release from a commercial nuclear power plant. The analysis procedure is based upon a state-of-the-art evaluation of the current seismic analysis and design process and explicitly accounts for uncertainties inherent in such a process. In Phase I, the seismic input, the soil-structure interaction, dynamic response of structures and subsystems, and fragility were developed and combined using a probabilistic computational procedure. Demonstration calculations were completed for the Zion nuclear power plant. In Phase II, presently ongoing, additional models, improvements to existing models, and improvements to the probabilistic computational assessment of Zion have been developed. Local site amplification has significant effect on structural response and is a major source of uncertainty. As part of the final Zion analysis in Phase II, an assessment of the local site effect at the Zion site was made using new time histories modified for the Zion soil conditions. In this paper, we briefly describe the approach used to correct the seismic hazard curve and time histories developed in Phase I for local site effects and discuss in some detail the results of our efforts to validate the approach. The principle step in the approach was the use of an equivalent linear iterative technique assuming vertically incident waves to correct a set of time histories appropriate for a rock outcrop for the local soil column. For the Zion soil column this led to large correction factors.

• Research Organization: Lawrence Livermore National Lab., CA (USA)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5935830
• Report Number(s): UCRL-86239; CONF-830805-39; ON: DE83012037
• Country of Publication: United States
• Language: English

Related Subjects

22 GENERAL STUDIES OF NUCLEAR REACTORS
220900* -- Nuclear Reactor Technology-- Reactor Safety
AMPLITUDES
EARTHQUAKES
ENRICHED URANIUM REACTORS
GROUND MOTION
MATHEMATICAL MODELS
MOTION
NUCLEAR FACILITIES
NUCLEAR POWER PLANTS
POWER PLANTS
POWER REACTORS
PWR TYPE REACTORS
REACTOR SITES
REACTORS
RISK ASSESSMENT
SEISMIC EFFECTS
SEISMIC EVENTS
SOILS
THERMAL POWER PLANTS
THERMAL REACTORS
WATER COOLED REACTORS
WATER MODERATED REACTORS
ZION-1 REACTOR
ZION-2 REACTOR