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 Unit 3Unit 4~800 feet~1400 feet Existing Units 1 & 2 North Vogtle ESP & COL Schedule First Concrete Fuel Load 11/14 Site Work 2005 2010 201520062007 2008 200920112012 2013 2014 COL ESP filed 8/06 File COLA COL Approval ESP Approval ESP Commercial

OperationUnit 3 -5/15Unit 4 -5/16 Cross Section Normal to PBF Development of Vogtle Site-Specific SSEUpdated EPRI PSHA

• Update of Charleston Seismic Source

• New Ground Motion Models (EPRI-04)

• Did not use revision to sigma nor CAV filterSite amplification per Approach 2ADefine SSE @ ground surface at hypothetical outcrop of highest competent in-situ

material* Top of Blue Bluff marl (~86'depth)Vertical SSE = V/H x Horiz. SSE SSE at 86-foot Depth Control Point0.0010.010.1 1 100.1110100Frequency (Hz)Spectral Acceleration (g)Horizontal SSEVertical SSE Vogtle ESP SSE at Top of Blue Bluff Marl (86-foot Depth) [GMRS]

Vogtle Site-Specific AP1000 Nuclear Island 3D SASSI AnalysisRequired for site compatibility due to site SSE

& soil profileInput motionSoil profile propertiesDevelop in-column time historiesUpdate Westinghouse 3D SASSI model of AP1000 NIAnalysis is in progress Vogtle Site-Specific 3D SASSI/AP1000 NIInput motion at outcrop at Elevation of AP1000 NI foundation (40'depth)

• Development of Horiz. SSE Spectrum at hypothetical outcrop at 40' depth is consistent w/ PSHA/site

amplification approach used for Vogtle ESP Horiz. SSE (86'depth)

• Used Vogtle Units 1&2 Engineered Backfill properties for fill above the top of Blue Bl uff Marl (86'depth) [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' Depth0.010.1 10.1110100Frequency, HzSpectral acceleration, gAP1000 Horizontal SSEHorizontal 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 NISoil 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 IslandCalculate in-column time histories at foundation horizon (40'depth)

• 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 IslandUpdating 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 hi stories 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 ISRSSix key locations specified in the DCDThree Vogtle ISRS (LB,BE,UB) < Certified Design ISRS @ each location ?Identify any ISRS exceedances & their significanceDetermine the need to use approved coherency functions Assessment of Vogtle AP1000 NI ISRS to AP1000 NI DCD ISRSPreliminary Results:

1 X Y Zni20 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 8.0110100Frequency (Hz)Acceleration (g)ssienv-d5 2970ni20VG-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 9.0110100Frequency (Hz)Acceleration (g)ssienv-d5 2970ni20VG-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 7.0110100Frequency (Hz)Acceleration (g)ssienv-d5 2970ni20VG-d5 2970