3D Analysis of the Influence of Varying Rock/Soil Profiles on Seismic NPP Response
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1 3D Analysis of the Influence of on Seismic NPP Response B. Jeremić, N. Tafazzoli, N. Orbović, A. Blahoianu University of California, Davis, CA, U.S.A. Canadian Nuclear Safety Commission, Ottawa, ON, Canada SMiRT 21, New Delhi, India, November 2011
2 Outline Introduction The Issues and Modelling Approaches The Problem The Modelling Simulations Results Variable Single Layer Base: Soil or Rock Variable Thickness Soil Layer Summary
3 Outline Introduction The Issues and Modelling Approaches The Problem The Modelling Simulations Results Variable Single Layer Base: Soil or Rock Variable Thickness Soil Layer Summary
4 Introduction High fidelity numerical simulations of seismic effects on NPPs Realistic seismic motions (3D, inclined motions, surface and body waves, lack of correlation, etc.) Realistic solids and structures modeling Understanding 3D, inclined waves and their interaction with variable soil/rock profiles
5 Outline Introduction The Issues and Modelling Approaches The Problem The Modelling Simulations Results Variable Single Layer Base: Soil or Rock Variable Thickness Soil Layer Summary
6 The Problem Seismic Motions Seismic motions: Body (SV, SH, P) and Surface (Rayleigh, Love) waves 3D, inclined, uncorrelated (incoherent) Effects of soil/rock layers on motions rupturing fault seismic wave propagation soil/rock stiffness seismic wave propagation rupturing fault soil/rock stiffness
7 The Problem Spatial Variability (Incoherence, Lack of Correlation) Attenuation effects, Wave passage effects, Scattering effects, Extended source effects Attenuation Fault Wave Front(s)
8 The Modelling Seismic Motion Development Green s functions regional model up to 15Hz Prof. Hisada s code Seismic waves propagated to NPP site Motions input using the Domain Reduction Method Lack of correlation inherent in regional ground motion modeling
9 The Modelling Uncorrelated/Incoherent Motions for Rock and Soil Original lack of correlation T. Ancheta development Further lack of correlation added using Abrahamson models for rock and soil (assuming ergodicity)
10 The Modelling Finite Element Models for the NPP Wave propagation with small error for given frequencies v s = 2600m/s, h = 5m, f max = 65Hz; vs = 1500m/s, h = 5m, f max = 37Hz; vs = 1000m/s, h = 5m, f max = 25Hz; vs = 300m/s, h = 5m, f max = 7Hz) Free field, surface and embedded foundations
11 The Modelling 3D Embedded Foundation Models
12 Outline Introduction The Issues and Modelling Approaches The Problem The Modelling Simulations Results Variable Single Layer Base: Soil or Rock Variable Thickness Soil Layer Summary
13 Variable Single Layer Base: Soil or Rock Variable Single Layer Base: Soil or Rock Four uniform rock/soil profiles Case 1: V s = 2600m/s Case 2: V s = 1500m/s Case 4: Vs = 1000m/s Case 8: Vs = 300m/s Gradual rise in stiffness 500m below uniform rock profiles Full 3D, inclined, uncorrelated motions, including body and surface waves, input using DRM
14 Variable Single Layer Base: Soil or Rock Base of the Internal Struct. on Surface Foundation Fourier Amplitude (X) [g] Frequency [Hz] Case 1 Case 2 Case 4 Case 8
15 Variable Single Layer Base: Soil or Rock Top of the Internal Struct. on Surface Foundation Fourier Amplitude (X) [g] Frequency [Hz] Case 1 Case 2 Case 4 Case 8
16 Variable Thickness Soil Layer Variable Thickness Soil Layer Four variable thickness soil (V s = 300m/s) profiles Case 6: H soil = 500m Case 5: H soil = 200m Case 10: Hsoil = 100m Case 12: Hsoil = 50m Stiff rock V s = 2600m/s beneath these soil profiles Full 3D, inclined, uncorrelated motions, including body and surface waves, input using DRM
17 Variable Thickness Soil Layer Base of the Internal Struct. on Surface Foundation Fourier Amplitude (X) [g] Frequency [Hz] Case 5 Case 6 Case 10 Case 12
18 Variable Thickness Soil Layer Top of the Internal Struct. on Surface Foundation Fourier Amplitude (X) [g] Frequency [Hz] Case 5 Case 6 Case 10 Case 12
19 Outline Introduction The Issues and Modelling Approaches The Problem The Modelling Simulations Results Variable Single Layer Base: Soil or Rock Variable Thickness Soil Layer Summary
20 Summary Realistic seismic motions (3D, inclined, uncorrelated, body and surface waves) do influence NPP ESSI response for variable soil/rock conditions Influences do vary in significance but are always present and need to be modeled and simulated Importance of high fidelity modeling to reduce modeling uncertainty Funding by and Collaboration with the CNSC is gratefully acknowledged
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