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AECL - OFFICIAL USE ONLY / À USAGE EXCLUSIF - EACL
Recent Experience with Soil-
Structure Interaction
Analyses for Nuclear
Facilities
Tarek Aziz, Richard Chen, Wei Liu, Sudip Adhikari,
George Stoynov and Qinhua Huang
Recent Experience with Soil-
Structure Interaction
Analyses for Nuclear
Facilities
Tarek Aziz, Richard Chen, Wei Liu, Sudip Adhikari,
George Stoynov and Qinhua Huang
Dr. Tarek Aziz
Principal Civil Engineer
Atomic Energy of Canada
Outline
• CANDU 6 Background
• Recent SSI models for life Extension and New Builds
(comparison of SSI models)
• Ground Motions Developed/Used and SSI Key
Assumptions
• Approach for Floor Response Spectra FRS Generation
• Comparison of SSI Models and Results (Stick models
versus HF models)
• Recent Case Studies CANDU 6 and Others
• Conclusions and current SSI Issues
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Operating CANDU 6 Plants…Operating CANDU 6 Plants…
UNRESTRICTED / ILLIMITÉ 3
Qinshan 1/2 Cernavoda Embalse
Gentilly 2 Point Lepreau Wolsong 1/2/3/4
Reactor Assembly…Reactor Assembly…
• Low pressure and low temperature Calandria houses the reactor assembly
• Calandria is set in a light water-filled, concrete, shielding vault
• Fuel channels and moderator are contained in Calandria
• End-shields are filled with light water and steel balls
UNRESTRICTED / ILLIMITÉ 4
1 CALANDRIA
2 CALANDRIA END SHIELD
3 SHUT-OFF AND CONTROL
RODS
4 POISON INJECTION
5 FUEL CHANNEL
ASSEMBLIES
6 FEEDER PIPES
7 VAULT
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Key Components…Key Components…
Fuel bundle
Calandria tube
Fuel channelFuel channel Calandria and HTS SystemCalandria and HTS System
Calandria (Reactor Core)Calandria (Reactor Core)
Fuelling MachineFuelling Machine
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CANDU 6 plantCANDU 6 plant
Qinshan Phase III, ChinaQinshan Phase III, China
Case Study # 1
CANDU 6 Reactor Building on a Rock
Site
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Background
• FRS produced for the Reactor Building (RB) using
conventional methods show a significant “g” level in
particular at high frequency content.
• In order to minimize the impact of this significant
increase on the reference CANDU plant design, the
SASSI computer code accounting for ground motion
incoherence and travelling wave effects is used.
• The objective is to define realistic seismic demands for
the Reactor Building.
• The incoherency and travelling wave effects
implemented for rock sites tend to filter out the high
frequency content of the input motion and result in a
reduction in seismic demands.
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2008 UHS Mean Ground Motions
used
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0.010
0.100
1.000
0.1 1.0 10.0 100.0
AC
CE
LE
RA
TIO
N (
g)
FREQUENCY (HZ)
G2 - 5% Damped Ground Response Spectra Comparison
Atkinson Nov. 2008 report - 0.0001 P.A. Mean UHS
Motion 1
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-0.4
-0.3
-0.2
-0.1
0
0.1
0.2
0.3
0.4
TIME (SECONDS)
SIMULATED GROUND ACCELERATION (MOTION-1)
_1
Motion 2
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-0.4
-0.3
-0.2
-0.1
0
0.1
0.2
0.3
0.4
TIME (SECONDS)
SIMULATED GROUND ACCELERATION (MOTION-2)
_1
Motion 3
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-0.4
-0.3
-0.2
-0.1
0
0.1
0.2
0.3
0.4
TIME (SECONDS)
SIMULATED GROUND ACCELERATION (MOTION-3)
_1
Incoherency and Travelling wave
Effects at Top of RB Mat
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0
0.5
1
1.5
2
2.5
3
0.1 1 10 100
5% FRS Node - 05018 (130 )in B/D (1/X) Direction
G2 HF Surface model COH
G2 HF Surface model INCOHWP
Incoherency and Travelling wave
Effects at Top of RB Mat
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0
0.5
1
1.5
2
2.5
3
0.1 1 10 100
5% FRS Node - 05018 (130 )in A/C (3/Y) Direction
G2 HF Surface model COH
G2 HF Surface model INCOHWP
Incoherency and Travelling wave
Effects at Top of RB Mat
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0
0.5
1
1.5
2
2.5
3
0.1 1 10 100
5% FRS Node - 05018 (130 )in VERTICAL (2/Z) Direction
G2 HF Surface model COH
G2 HF Surface model INCOHWP
Incoherency and Travelling wave
Effects at Boiler Box
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0
0.5
1
1.5
2
2.5
3
0.1 1 10 100
5% FRS Node - 05046 (500 )in B/D (1/X) Direction
G2 HF Surface model COH
G2 HF Surface model INCOHWP
Incoherency and Travelling wave
Effects at Boiler Box
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0
0.5
1
1.5
2
2.5
3
0.1 1 10 100
5% FRS Node - 05046 (500 )in A/C (3/Y) Direction
G2 HF Surface model COH
G2 HF Surface model INCOHWP
Incoherency and Travelling wave
Effects at Boiler Box
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0
0.5
1
1.5
2
2.5
3
0.1 1 10 100
5% FRS Node - 05046 (500 )in VERTICAL (2/Z) Direction
G2 HF Surface model COH
G2 HF Surface model INCOHWP
Case Study # 2
CANDU 6 Reactor Building on a
Soil Site
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34
1st
Mode of R/B Stick Model with
Fixed Base
34
F1= 6.531 Hz
Y Direction
Kajima F1=6.2
Hz (Y-Direction)
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2nd
Mode of R/B Stick Model with
Fixed Base
35
F2= 7.021 Hz
X Direction
Kajima F2=7.3
Hz (X-Direction)
Site Soil Profile and Properties
• Soil profile with shear wave velocity, layer thickness, density, and
Poisson’s ratios as follows
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Depth
(m)
Layer Thickness
(m)
Mass Density
(ton/m3) Poisson's Ratio
Shear Wave Velocity
(m/s)
Shear Modulus
(kN/m2)
0 ~ 6 6.0 1.8639 0.35 272 1.37899E+05
6 ~ 13 7.0 1.8639 0.35 229 9.77448E+04
13 ~ 20 7.0 1.8639 0.35 261 1.26971E+05
20 ~ 26 6.0 1.8639 0.35 281 1.47175E+05
26 ~ 33 7.0 1.8639 0.35 308 1.76817E+05
33 ~ 41 8.0 1.8639 0.35 344 2.20566E+05
41 ~ 50 9.0 1.8639 0.35 417 3.24112E+05
50 ~ 60 10.0 1.8639 0.35 482 4.33029E+05
Analysis Models
• Stick Model
–Check Overall Structural Stability (overturning and sliding)
–Check overall concrete shear capacity of C/S and I/S
• 3D FE Model
–Check strength of the C/S
–Check Strength of the I/S
–Check strength of the UJE support Column
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Structure Assessment Based on
3D FEA Model Data
Selected Critical Locations
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Sample Results
• Section Check:
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Result of axial
force plus bending