Evaluation of structural fragilities for an IPEEE seismic probabilistic risk assessment study

Conference · Sun Dec 31 04:00:00 EST 1995

OSTI ID:170364

Ghiocel, D M; Wilson, P R; Stevenson, J D ^[1]

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1. Stevenson and Associates, Cleveland, OH (United States)

The paper presents the main issues and results of a structural fragility analysis for a Seismic Probabilistic Risk Assessment (SPRA) study of a nuclear power plant (NPP) in the Eastern US. The fragility evaluations were performed for the Reactor Building, Auxiliary Building, Intake Structure and Diesel Generator Building. The random seismic input is defined in terms of the Uniform Hazard Spectrum (UHS) earthquake on the NPP site anchored to a reference level of 0.40 g Zero Period Ground Acceleration (ZPGA). Because of the soft soil conditions new Soil-Structure Interaction (SSI) analyses were performed using the original finite element (stick) structural models and the complex frequency approach. The soil deposit randomness was described by the variations in both the low strain soil shear modules and in its dependence with the shear strain. The probabilistic SSI analyses were performed using digital simulation techniques. The critical failure modes for each structure are investigated and the fragility evaluations are discussed. Concluding remarks and recommendations for improving the quality of the structural fragility analyses are included.

• OSTI ID: 170364
• Report Number(s): CONF-950740--; ISBN 0-7918-1343-6
• Country of Publication: United States
• Language: English

Related Subjects

22 GENERAL STUDIES OF NUCLEAR REACTORS
AUXILIARY SYSTEMS
CONTAINMENT BUILDINGS
DAMAGE
DIESEL ENGINES
EARTHQUAKES
FAILURE MODE ANALYSIS
INTAKE STRUCTURES
NUCLEAR POWER PLANTS
REACTOR CORES
RISK ASSESSMENT
SEISMIC EFFECTS
SOIL-STRUCTURE INTERACTIONS