Light Water Reactor Sustainability Program Advanced Seismic Soil Structure Modeling
- Idaho National Lab. (INL), Idaho Falls, ID (United States)
Risk calculations should focus on providing best estimate results, and associated insights, for evaluation and decision-making. Specifically, seismic probabilistic risk assessments (SPRAs) are intended to provide best estimates of the various combinations of structural and equipment failures that can lead to a seismic induced core damage event. However, in some instances the current SPRA approach has large uncertainties, and potentially masks other important events (for instance, it was not the seismic motions that caused the Fukushima core melt events, but the tsunami ingress into the facility). SPRA’s are performed by convolving the seismic hazard (this is the estimate of all likely damaging earthquakes at the site of interest) with the seismic fragility (the conditional probability of failure of a structure, system, or component given the occurrence of earthquake ground motion). In this calculation, there are three main pieces to seismic risk quantification, 1) seismic hazard and nuclear power plants (NPPs) response to the hazard, 2) fragility or capacity of structures, systems and components (SSC), and 3) systems analysis. Two areas where NLSSI effects may be important in SPRA calculations are, 1) when calculating in-structure response at the area of interest, and 2) calculation of seismic fragilities (current fragility calculations assume a lognormal distribution for probability of failure of components). Some important effects when using NLSSI in the SPRA calculation process include, 1) gapping and sliding, 2) inclined seismic waves coupled with gapping and sliding of foundations atop soil, 3) inclined seismic waves coupled with gapping and sliding of deeply embedded structures, 4) soil dilatancy, 5) soil liquefaction, 6) surface waves, 7) buoyancy, 8) concrete cracking and 9) seismic isolation The focus of the research task presented here-in is on implementation of NLSSI into the SPRA calculation process when calculating in-structure response at the area of interest. The specific nonlinear soil behavior included in the NLSSI calculation presented in this report is gapping and sliding. Other NLSSI effects are not included in the calculation. The results presented in this report document initial model runs in the linear and nonlinear analysis process. Final comparisons between traditional and advanced SPRA will be presented in the September 30th deliverable.
- Research Organization:
- Idaho National Lab. (INL), Idaho Falls, ID (United States)
- Sponsoring Organization:
- USDOE Office of Nuclear Energy (NE)
- DOE Contract Number:
- AC07-05ID14517
- OSTI ID:
- 1235205
- Report Number(s):
- INL/EXT-15-35687; M3LW-15IN0702035; TRN: US1600234
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
58 GEOSCIENCES
NUCLEAR POWER PLANTS
WATER MODERATED REACTORS
SOILS
WATER COOLED REACTORS
HAZARDS
CRACKS
EARTHQUAKES
FAILURES
FOUNDATIONS
GROUND MOTION
NONLINEAR PROBLEMS
PROBABILISTIC ESTIMATION
SEISMIC WAVES
DILATANCY
LIQUEFACTION
PROBABILITY
SIMULATION
SUSTAINABILITY
RISK ASSESSMENT
SEISMIC ISOLATION
SYSTEMS ANALYSIS
WAVE PROPAGATION
DAMAGE
EQUIPMENT
BUILDINGS
IMPLEMENTATION
MATHEMATICAL MODELS
SOIL-STRUCTURE INTERACTIONS
SEISMIC SURFACE WAVES
seismic
soil structure