ML070670333
| ML070670333 | |
| Person / Time | |
|---|---|
| Site: | Vogtle, 05200006, PROJ0740  |
| Issue date: | 03/01/2007 |
| From: | Moore D Southern Nuclear Operating Co |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| AP1000 | |
| Download: ML070670333 (20) | |
Text
Vogtle AP1000 Seismic Assessment Status March 1, 2007 Don Moore, Consulting Engineer Southern Nuclear Operating Company
Proposed Layout Unit 3 Unit 4
~800 feet
~1400 feet Existing Units 1 & 2 North
Vogtle ESP & COL Schedule First Concrete Fuel Load 11/14 Site Work 2005 2010 2015 2006 2007 2008 2009 2011 2012 2013 2014 COL ESP filed 8/06 File COLA COL Approval ESP Approval ESP Commercial Operation Unit 3 - 5/15 Unit 4 - 5/16
Cross Section Normal to PBF
Development of Vogtle Site-Specific SSE
- Update of Charleston Seismic Source
- New Ground Motion Models (EPRI-04)
- Did not use revision to sigma nor CAV filter
Site amplification per Approach 2A
Define SSE @ ground surface at hypothetical outcrop of highest competent in-situ material
- Top of Blue Bluff marl (~86depth)
Vertical SSE = V/H x Horiz. SSE
SSE at 86-foot Depth Control Point 0.001 0.01 0.1 1
10 0.1 1
10 100 Frequency (Hz)
Spectral Acceleration (g)
Horizontal SSE Vertical SSE Vogtle ESP SSE at Top of Blue Bluff Marl (86-foot Depth) [GMRS]
Vogtle Site-Specific AP1000 Nuclear Island 3D SASSI Analysis Required for site compatibility due to site SSE
& soil profile
Input motion Soil profile properties Develop in-column time histories Update Westinghouse 3D SASSI model of AP1000 NI Analysis is in progress
Vogtle Site-Specific 3D SASSI/AP1000 NI Input motion at outcrop at Elevation of AP1000 NI foundation (40depth)
- Development of Horiz. SSE Spectrum at hypothetical outcrop at 40 depth is consistent w/ PSHA/site amplification approach used for Vogtle ESP Horiz. SSE (86depth)
- Used Vogtle Units 1&2 Engineered Backfill properties for fill above the top of Blue Bluff Marl (86depth) [Expect similar values for Units 3&4]
- Used the same V/H ratio function @ 86 depth to define vertical SSE at 40 depth
Vogtle Horizontal SSE, Outcrop 40' Depth 0.01 0.1 1
0.1 1
10 100 Frequency, Hz Spectral acceleration, g AP1000 Horizontal SSE Horizontal SSE @
40' Depth Outcrop (Input for Site-specific SSI analysis of AP1000 NI) [FIRS]
Elevation 220 Vogtle input motion SSE at hypothetical outcrop at 40 depth for control point seismic input for site-specific SSI analysis of AP1000 nuclear island. These are Foundation Input Response Spectra (FIRS)
~900 Coastal Plain Sediments 76 Blue Bluff Marl Vogtle ESP SSE defined at the free ground surface of a hypothetical outcrop of the highest competent in-situ layer (top of Blue Bluff Marl at depth of 86). These are the Site-Specific Ground Motion Response Spectra (GMRS)
~86 Engineered Backfill Vogtle Site-Specific 3D SASSI/AP1000 Nuclear Island Not to scale
Vogtle Site Specific 3D SASSI/AP1000 NI Soil Profile Properties (Lower Bound, Best Estimate & Upper Bound)
- Mean soil profile properties base on site profile randomization to obtain site amplification factors
- Best Estimate=mean soil profile properties
- Used either + and - one sigma of Vs or 1/1.5 and 1.5 mean Gs whichever produced the largest spread
Vogtle Site Specific 3D SASSI AP1000 Nuclear Island Calculate in-column time histories at foundation horizon (40depth)
- N-S, E-W, and vertical TH for each of the 3 soil profiles
- Total 9 Time Histories (3 orthogonal component TH x 3 soil profiles = 9 TH)
- Calculate Fourier amplitude spectra to determine highest frequency of interest (Freq. where Fourier amplitude falls below 10% of max. Fourier amplitude)
Vogtle Site Specific 3D SASSI AP1000 Nuclear Island Updating Westinghouse 3D SASSI Model of AP1000 NI
- Finite element mesh size adjustment to capture highest frequency of interest
- Vogtle 3 soil profiles (LB, BE, UB)
- Vogtle in-column time histories associated with each of the 3 soil profiles
- Initial runs using coherent motion (no coherency functions used)
Assessment of Vogtle AP1000 NI ISRS to AP1000 NI DCD ISRS Six key locations specified in the DCD Three Vogtle ISRS (LB,BE,UB) < Certified Design ISRS @ each location ?
Identify any ISRS exceedances & their significance Determine the need to use approved coherency functions
Assessment of Vogtle AP1000 NI ISRS to AP1000 NI DCD ISRS Preliminary Results:
1 X
Y Z
ni20 Model - El. 265' NOV 20 2005 19:25:57 ELEMENTS REAL NUM 2970 2734 ASB at Elevation 333.12
ASB at Elevation 333.12 FRS Comparison X Direction 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 1
10 100 Frequency (Hz)
Acceleration (g) ssienv-d5 2970 ni20VG-d5 2970
ASB at Elevation 333.12 FRS Comparison Y Direction 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 1
10 100 Frequency (Hz)
Acceleration (g) ssienv-d5 2970 ni20VG-d5 2970
ASB at Elevation 333.12 FRS Comparison Z Direction 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 1
10 100 Frequency (Hz)
Acceleration (g) ssienv-d5 2970 ni20VG-d5 2970