ML070670333

AP1000 Seismic Assessment Status

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 North Existing Units 1 & 2 Unit 4 Unit 3

~800 feet ~1400 feet

Vogtle ESP & COL Schedule 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 ESP filed ESP ESP 8/06 Approval Commercial Operation COL Unit 3 - 5/15 COL File COLA Approval Unit 4 - 5/16 Fuel First Load Concrete 11/14 Site Work

Cross Section Normal to PBF Development of Vogtle Site-Specific SSE Updated EPRI PSHA

• 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 Vogtle ESP SSE at Top of Blue Bluff Marl (86-foot Depth) [GMRS]

10 1

Spectral Acceleration (g) 0.1 0.01 Horizontal SSE Vertical SSE 0.001 0.1 1 10 100 Frequency (Hz)

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 (Input for Site-specific SSI analysis of AP1000 NI) [FIRS]

1 Spectral acceleration, g AP1000 Horizontal SSE 0.1 Horizontal SSE @

40' Depth Outcrop 0.01 0.1 1 10 100 Frequency, Hz

Vogtle Site-Specific 3D SASSI/AP1000 Nuclear Island Vogtle input motion SSE at hypothetical outcrop at 40 depth for control point seismic input for site-specific SSI Not to scale analysis of AP1000 nuclear island. These are Foundation Input Response Spectra (FIRS)

Vogtle ESP SSE defined at the free Elevation 220 ground surface of a hypothetical outcrop

~86 of the highest Engineered competent in-situ Backfill layer (top of Blue Bluff Marl at depth of 86). These are the 76 Blue Site-Specific Ground Bluff Marl Motion Response Spectra (GMRS)

~900 Coastal Plain Sediments

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:

ASB at Elevation 333.12 1

ELEMENTS 2970 NOV 20 2005 REAL NUM 2734 19:25:57 Z

Y X

ni20 Model - El. 265'

ASB at Elevation 333.12 FRS Comparison X Direction 8.0 7.0 6.0 5.0 Acceleration (g) ssienv-d5 2970 4.0 ni20VG-d5 2970 3.0 2.0 1.0 0.0 1 10 100 Frequency (Hz)

ASB at Elevation 333.12 FRS Comparison Y Direction 9.0 8.0 7.0 6.0 Acceleration (g) 5.0 ssienv-d5 2970 ni20VG-d5 2970 4.0 3.0 2.0 1.0 0.0 1 10 100 Frequency (Hz)

ASB at Elevation 333.12 FRS Comparison Z Direction 7.0 6.0 5.0 Acceleration (g) 4.0 ssienv-d5 2970 ni20VG-d5 2970 3.0 2.0 1.0 0.0 1 10 100 Frequency (Hz)