ML13259A041
| ML13259A041 | |
| Person / Time | |
|---|---|
| Site: | Surry  |
| Issue date: | 09/12/2013 |
| From: | Grecheck E Virginia Electric & Power Co (VEPCO) |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| 13-244C | |
| Download: ML13259A041 (14) | |
Text
VIRGINIA ELECTRIC AND POWER COMPANY RICHMOND, VIRGINIA 23261 September 12, 2013 U.S. Nuclear Regulatory Commission Serial No.
13-244C Attention: Document Control Desk NL&OS/WDC RO Washington, DC 20555 Docket Nos.
50-280/281 License Nos.
DPR-32/37 VIRGINIA ELECTRIC AND POWER COMPANY SURRY POWER STATION UNITS I AND 2 RESPONSE TO MARCH 12, 2012 INFORMATION REQUEST REGARDING SEISMIC ASPECTS OF RECOMMENDATION 2.1 - 1.5 YEAR RESPONSE FOR CEUS SITES
References:
- 1. NRC Letter, "Request for Information Pursuant to Title 10 of the Code of Federal Regulations 50.54(f) Regarding Recommendations 2.1, 2.3, and 9.3, of the Near-Term Task Force Review of Insights from the Fukushima Dai-ichi Accident," dated March 12, 2012
- 2. NRC Letter, Endorsement of EPRI Final Draft Report 1025287, "Seismic Evaluation Guidance," dated February 15, 2013
- 3. EPRI Report 1025287, Seismic Evaluation Guidance: Screening, Prioritization and Implementation Details (SPID) for the Resolution of Fukushima Near-Term Task Force Recommendation 2.1: Seismic
- 4. NEI letter to NRC, Proposed Path Forward for NTTF Recommendation 2.1:
Seismic Reevaluations, dated April 9, 2013
- 5. NRC Letter, EPRI Final Draft Report 3002000704, "Seismic Evaluation Guidance:
Augmented Approach for the Resolution of Near-Term Task Force Recommendation 2.1: Seismic," as an Acceptable Alternative to the March 12, 2012, Information Request for Seismic Reevaluations, dated May 7, 2013 On March 12, 2012, the Nuclear Regulatory Commission (NRC) issued Reference 1 to all power reactor licensees and holders of construction permits in active or deferred status. of Reference 1 requested each addressee in the Central and Eastern United States (CEUS) to submit a written response consistent with the requested seismic hazard evaluation information (items 1 through 7) by September 12, 2013. On February 15, 2013, NRC issued Reference 2, endorsing the Reference 3 industry guidance for responding to Reference 1. Section 4 of Reference 3 identifies the detailed information to be included in the seismic hazard evaluation submittals.
On April 9, 2013, NEI submitted Reference 4 to the NRC, requesting NRC agreement to delay submittal of some of the CEUS seismic hazard evaluation information so that an update to the EPRI (2004, 2006) ground motion attenuation model could be completed and used to develop that information.
NEI proposed that descriptions of subsurface materials and properties and base case velocity profiles (items 3a and 3b in Section 4 of Reference 3) be submitted to NRC by September 12, 2013 as an interim product of seismic hazard development efforts being performed in accordance with Reference 3.
The final seismic hazard and screening information will be submitted to NRC by March 31, 2014. In Reference 5, NRC agreed with this recommendation.
-40of
Serial No. 13-244C Docket Nos. 50-280/281 Page 2 of 3 The attachment to this letter contains the requested descriptions materials and properties and base case velocity profiles for Surry Power of subsurface Station.
If you have any questions regarding this information, please contact Gary D. Miller at (804) 273-2771.
Sincerely, Eugene S. Grecheck Vice President - Nuclear Engineering and Development COMMONWEALTH OF VIRGINIA COUNTY OF HENRICO
))
)
The foregoing document was acknowledged before me, in and for the County and Commonwealth aforesaid, today by Eugene S. Grecheck, who is Vice President - Nuclear Engineering and Development of Virginia Electric and Power Company. He has affirmed before me that he is duly authorized to execute and file the foregoing document in behalf of that company, and that the statements in the document are true to the best of his knowledge and belief.
Acknowledged before me this._L_ day of i
2013.
My Commission Expires: AL 3 1. c 0-.....
m I
r It A
boo Notary Public qi VICKI L. HULL Notary Public Commonwealth of Virginia 140542 My Commission Expires May 31, 2014 L0-Commitments made in this letter: No new regulatory commitments
Attachment:
Subsurface Materials and Properties and Base Case Velocity Profiles (SPID Section 4, Items 3a and 3b)
Serial No. 13-244C Docket Nos. 50-280/281 Page 3 of 3 cc:
U.S. Nuclear Regulatory Commission, Region II Regional Administrator Marquis One Tower 245 Peachtree Center Ave. NE Suite 1200 Atlanta, Georgia 30303-1257 K. R. Cotton Gross Project Manager - Surry U.S. Nuclear Regulatory Commission One White Flint North, Mail Stop 08 G-9A 11555 Rockville Pike Rockville, MD 20852-2738 Dr. V. Sreenivas Project Manager - North Anna U.S. Nuclear Regulatory Commission One White Flint North, Mail Stop 08 G-9A 11555 Rockville Pike Rockville, MD 20852-2738 NRC Senior Resident Inspector Surry Power Station
Serial No. 13-244C Docket Nos. 50-280/281 ATTACHMENT SUBSURFACE MATERIALS AND PROPERTIES AND BASE CASE VELOCITY PROFILES (SPID SECTION 4. ITEMS 3A AND 3B)
VIRGINIA ELECTRIC AND POWER COMPANY (DOMINION)
SURRY POWER STATION UNITS 1 AND 2
Serial No. 13-244C Docket Nos. 50-280/281, Page 1 of 10 Surry Power Station Units I and 2 Subsurface Materials and Properties and Base Case Velocity Profiles I
Introduction This document provides the rationale for developing three profiles to be used in computing the ground motion response spectrum (GMRS) consistent with the methodology outlined in the Electric Power Research Institute's (EPRI) Screening Prioritization and Implementation Details (SPID) document (Reference 1).
The following properties are considered in this report:
" geologic setting, safety related structures, stratigraphy / layer thickness,
" shear modulus and material damping, and
" shear wave velocity profiles selected for use.
2 Geologic Setting As described in Reference 3, the Surry Power Station (SPS) site is located adjacent to the James River on Gravel Neck in Surry County, Virginia, within the Atlantic Coastal Plain physiographic province, approximately half way between the Atlantic Ocean and the Fall Line forming the boundary between the Piedmont and Atlantic Coastal Plain. In Virginia, the Atlantic Coastal Plain has a stair-step character composed of a series of plains successfully decreasing in elevation from west to east.
These plains are separated from one another by scarps. In the site vicinity, four plains are recognized.
From highest to lowest they are the elevation 120-foot plain, the elevation 90-foot plain, the elevation 70-foot plain, and the elevation 45-foot plain. The scarps separating these plains are known as the Surry scarp, the Peary scarp, and the Chippokes scarp.
The site consists of Pleistocene Epoch Norfolk Estuarine Formation deposits to depths ranging from 50 to 80 feet. Layers of brown to mottled brown sand, silty sand, organic and inorganic silts and clays, interlayered with iron-oxide cemented sands comprise the upper 20 to 35 feet of this formation, while layers of gray sand, silty sand, and organic to inorganic clays and silts with decayed vegetation and shell fragments comprise the lower portion of this formation.
The Norfolk Formation deposits lie above Miocene Epoch Chesapeake Group sediments comprising very stiff, green to dark gray clays containing shell fragments with occasional compact sand and silt layers. This Miocene deposit is estimated to be about 240 feet thick at the site. Underlying the Miocene sediments are Eocene, Paleocene,
Serial No. 13-244C Docket Nos. 50-280/281, Page 2 of 10 and Cretaceous deposits estimated to be about 45 feet, 55 feet, and at least 800 feet, respectively, in thickness, based upon wells drilled in the general area. Metamorphic and igneous crystalline bedrock is estimated to be roughly 1300 feet deep at the site based upon seismic investigations conducted about 2 miles southeast of the site (Reference 3, Section 2.4.2.1). Information available in an unrelated study (Reference
- 4) suggests however, that the basement bedrock is somewhat deeper, on the order of 1600 feet below Hog Island, the peninsula where the plant is located.
Upper portions of the Pleistocene deposits were excavated and replaced with compacted granular fill to support shallow foundations at the plant, while the lower Miocene deposits support deep mat foundations, driven piles and sheet pile cutoffs (Reference 3, Section 2.4.7 and Table 2.4-12). The pertinent soil profile varies from the top of Miocene clay to the top of the granular fill replacement material.
3 Safety-Related Structures Reference 1 provides very specific guidelines on how a nuclear power facility is to identify the Safe Shutdown Earthquake (SSE) Control Point elevation for a plant or unit if this control point was not identified in the Updated Final Safety Analysis Report (UFSAR).
In accordance with Reference 1, Surry has been designated as a soil supported site. In the case of a plant designated as a soil site, the SSE control point is defined as the foundation bearing elevation of the highest soil supported, safety related structure. The safety related structure at Surry Power Station bearing at the highest elevation is the Emergency Condensate Storage Tank which bears at elevation 26.5 feet on compacted fill placed after the critical power block area was excavated to approximately elevation 7 feet during construction (Reference 3, Section 2.4.7.1 and 2.4.9). Thus, the SSE Control Point for GMRS screening for Surry Power Station is at El. 26.5 ft.
4 Stratigraphy / Layer Thickness The GMRS elevation is at the top of approximately 1600 feet of unconsolidated sedimentary deposits, terminating in either upper Miocene Epoch clays and silts or lower Pleistocene Epoch clay, sand or silty sand materials. The top 140 to 200 vertical feet of the 1600 feet was selectively explored, sampled and tested with laboratory or geophysical methods. The properties of these and the underlying materials are summarized in Table 1. As indicated in Table 1, the SSE Control Point is assumed to be at the surface, and the profile was modeled up to the surface.
Information provided in Table 1 is based primarily on Reference 3. Where specific data were not readily available, reasonable approximations and supporting data are provided and documented in Reference 2.
Serial No. 13-244C Docket Nos. 50-280/281, Page 3 of 10 5
Shear Modulus and Material Damping For dynamic properties of soft rock layers, modulus and damping curves were represented with two (2) models.
The first model used rock curves taken from Reference 5, the second model assumed linear behavior. These dynamic property models were weighted equally.
For dynamic properties of clay and sand layers, modulus and damping curves were also represented with 2 models. The first model used soil curves taken from Reference 5, the second model used soil curves taken from References 6 and 7. These dynamic property models were weighted equally. To model the profile, soft rock modulus and damping curves from Reference 5 were paired with soil modulus and damping curves from Reference 5, and linear rock modulus and damping curves were paired with soil modulus and damping curves from References 6 and 7.
6 Shear Wave Velocity The three (3) base-case shear-wave velocity profiles used to model amplification at the site are shown in Figure 1.
Profiles 1, 2, and 3 are weighted 0.4, 0.3, and 0.3, respectively. Thicknesses, depths, and shear-wave velocities (Vs) corresponding to each profile are shown in Table 2.
7 References
- 1. Electric Power Research Institute (EPRI). "Seismic Evaluation Guidance, Screening, Prioritization and Implementation Details (SPID) for the Resolution of Fukushima Near-Term Task Force Recommendation 2.1: Seismic," Final Report No. 1025287, Electric Power Research Institute, Palo Alto, CA, 2013.
- 2. Dominion, "Seismic Screening GMRS Subsurface Profile for Surry Power Station," ETE-CCE-2013-0002, Revision 0.
- 3. Surry Power Station, UFSAR, Revision 44.07.
- 4. United States Geological Survey (USGS) Professional Paper No. 1612, "The Effects of the Chesapeake Bay Impact Crater on the Geological Framework and Correlation of Hydrogeologic Units of the Lower York-James Peninsula, Virginia",
published February 2 2nd, 2000.
- 5. EPRI (1993).
Guidelines for Determining Design Basis Ground Motions, Elec.
Power Res. Inst., Palo Alto, CA, Rept. TR-102293, Vol. 1-5.
- 6. Silva, W.J., N. A. Abrahamson, G.R. Toro, and C. Costantino (1996). Description and Validation of the Stochastic Ground Motion Model, Rept. submitted to Brookhaven NatI. Lab., Assoc. Universities Inc., Upton NY 11973, Contract No.
770573.
Serial No. 13-244C Docket Nos. 50-280/281, Page 4 of 10
- 7. Walling, M.A., W.J., Silva and N.A. Abrahamson (2008).
"Nonlinear Site Amplification Factors for Constraining the NGA Models," Earthquake Spectra, 24 (1) 243-255.
- 8. EPRI Letter, R.P. Kassawara, EPRI to D. Bhargava, Dominion, Transmittal of Site Description Report for the Surry Plant, August 30, 2013.
- 9. Regulatory Guide 1.208, "A Performance Based Approach to Define the Site Specific Earthquake Ground Motion," March 2007.
Serial No. 13-244C Docket Nos. 50-280/281, Page 5 of 10 Table 1: Surry Power Station Site Geotechnical Profile Data Depth Shear Wave Range Soil Density Velocity, V, (feet)
Description (pcf)
(fps) 0 (El. 26.5)
Emergency Condensate Storage Tank 0 (El. 26.5)
SSE Control Point Elevation 0 -16 Compacted Granular Fill 130 1000111 16 - 27 Pleistocene Upper Clay 94 790 27-40 Pleistocene Sand A 99 950 40- 52 Pleistocene Lower Medium Clay 84 710 52 -67 Pleistocene Sand B 102 830 67 (El. -41)
Containment Foundation 67-96 Miocene Chesapeake dark blue to gray 87 940 Clay, shell Marl Pile tips below Spent Fuel Pool, Main 96 (El. -70)
Steam Valve House, and Refueling Water Storage Tank 67-307 Miocene Chesapeake dark blue to gray 87 940 Clay, shell Marl 307-362 Eocene gray Marl, Glauconitic and Quart 120 (2) 1200 (2)
Sand, Pyritic Marl, Limestone beds 362-407 Paleocene Mattaponi mottled Clay, 130 (2) 1000 (2)
Glauconitic Sand and Marl, Quartz Sand 407-1600 Cretaceous Potomac Group Sand and 140(2) 2000 (2 Clay beds 1600- 1700 Crystalline Igneous and Metamorphic Rock 160 7000 {
1700+ (2)
"Hard Rock" - Crystalline Igneous and 170 (2) 9200 (2)(3)
Metamorphic Rock I
(1) Estimated; considered typical for compacted granular fill material.
(2) Rough estimates / Approximation for analysis purposes; no data readily available.
(3) Definition of Hard Rock Position C, Section 4 in Reference 9.
Serial No. 13-244C Docket Nos. 50-280/281, Page 6 of 10 Figure 1: Vs Profiles for Surry Site Vs profiles for Surry Site Vs (ft/sec) 0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 0
100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800
-= -
L F
TIP I r!
-Profile 1
Profile 2 Profile 3
Serial No. 13-244C Docket Nos. 50-280/281, Page 7 of 10 Table 2: Layer Thicknesses, Depths, and Vs for 3 Profiles, Surry Site Profile 1 Profile 2 Profile 3 Thickness(ft)
Depth (ft)
Vs(ft/s)
Thickness(ft)
Depth (ft)
Vs(ft/s)
Thickness(ft)
Depth (ft)
Vs(ft/s) 0 1000 0
640 0
1570 8.0 8.0 1000 8.0 8.0 640 8.0 8.0 1570 8.0 16.0 1000 8.0 16.0 640 8.0 16.0 1570 4.0 20.0 790 4.0 20.0 506 4.0 20.0 1240 7.0 27.0 790 7.0 27.0 506 7.0 27.0 1240 6.5 33.5 950 6.5 33.5 608 6.5 33.5 1492 6.5 40.0 950 6.5 40.0 608 6.5 40.0 1492 6.0 46.0 710 6.0 46.0 454 6.0 46.0 1115 6.0 52.0 710 6.0 52.0 454 6.0 52.0 1115 7.5 59.5 830 7.5 59.5 531 7.5 59.5 1303 7.5 67.0 830 7.5 67.0 531 7.5 67.0 1303 5.0 72.0 940 5.0 72.0 602 5.0 72.0 1476 5.0 77.0 940 5.0 77.0 602 5.0 77.0 1476 5.0 82.0 940 5.0 82.0 602 5.0 82.0 1476 5.0 87.0 940 5.0 87.0 602 5.0 87.0 1476 5.0 92.0 940 5.0 92.0 602 5.0 92.0 1476 5.0 97.0 940 5.0 97.0 602 5.0 97.0 1476 5.0 102.0 940 5.0 102.0 602 5.0 102.0 1476 5.0 107.0 940 5.0 107.0 602 5.0 107.0 1476 5.0 112.0 940 5.0 112.0 602 5.0 112.0 1476 5.0 117.0 940 5.0 117.0 602 5.0 117.0 1476 3.0 120.0 940 3.0 120.0 602 3.0 120.0 1476 7.0 127.0 940 7.0 127.0 602 7.0 127.0 1476 5.0 132.0 940 5.0 132.0 602 5.0 132.0 1476 5.0 137.0 940 5.0 137.0 602 5.0 137.0 1476 5.0 142.0 940 5.0 142.0 602 5.0 142.0 1476 5.0 147.0 940 5.0 147.0 602 5.0 147.0 1476 5.0 152.0 940 5.0 152.0 602 5.0 152.0 1476 5.0 157.0 940 5.0 157.0 602 5.0 157.0 1476 5.0 162.0 940 5.0 162.0 602 5.0 162.0 1476 5.0 167.0 940 5.0 167.0 602 5.0 167.0 1476 5.0 172.0 940 5.0 172.0 602 5.0 172.0 1476 5.0 177.0 940 5.0 177.0 602 5.0 177.0 1476 5.0 182.0 940 5.0 182.0 602 5.0 182.0 1476 5.0 187.0 940 5.0 187.0 602 5.0 187.0 1476 5.0 192.0 940 5.0 192.0 602 5.0 192.0 1476
Serial No. 13-244C Docket Nos. 50-280/281, Page 8 of 10 Table 2: Layer Thicknesses, Depths, and Vs for 3 Profiles, Surry Site Profile 1 Profile 2 Profile 3 Thickness(ft)
Depth (ft)
Vs(ft/s)
Thickness(ft)
Depth (ft)
Vs(ft/s)
Thickness(ft)
Depth (ft)
Vs(ft/s) 5.0 197.0 940 5.0 197.0 602 5.0 197.0 1476 5.0 202.0 940 5.0 202.0 602 5.0 202.0 1476 5.0 207.0 940 5.0 207.0 602 5.0 207.0 1476 5.0 212.0 940 5.0 212.0 602 5.0 212.0 1476 5.0 217.0 940 5.0 217.0 602 5.0 217.0 1476 5.0 222.0 940 5.0 222.0 602 5.0 222.0 1476 5.0 227.0 940 5.0 227.0 602 5.0 227.0 1476 5.0 232.0 940 5.0 232.0 602 5.0 232.0 1476 5.0 237.0 940 5.0 237.0 602 5.0 237.0 1476 5.0 242.0 940 5.0 242.0 602 5.0 242.0 1476 5.0 247.0 940 5.0 247.0 602 5.0 247.0 1476 3.0 250.0 940 3.0 250.0 602 3.0 250.0 1476 7.0 257.0 940 7.0 257.0 602 7.0 257.0 1476 5.0 262.0 940 5.0 262.0 602 5.0 262.0 1476 5.0 267.0 940 5.0 267.0 602 5.0 267.0 1476 5.0 272.0 940 5.0 272.0 602 5.0 272.0 1476 5.0 277.0 940
,5.0 277.0 602 5.0 277.0 1476 5.0 282.0 940 5.0 282.0 602 5.0 282.0 1476 5.0 287.0 940 5.0 287.0 602 5.0 287.0 1476 5.0 292.0 940 5.0 292.0 602 5.0 292.0 1476 5.0 297.0 940 5.0 297.0 602 5.0 297.0 1476 5.0 302.0 940 5.0 302.0 602 5.0 302.0 1476 5.0 307.0 940 5.0 307.0 602 5.0 307.0 1476 5.0 312.0 1200 5.0 312.0 768 5.0 312.0 1884 5.0 317.0 1200 5.0 317.0 768 5.0 317.0 1884 5.0 322.0 1200 5.0 322.0 768 5.0 322.0 1884 5.0 327.0 1200 5.0 327.0 768 5.0 327.0 1884 5.0 332.0 1200 5.0 332.0 768 5.0 332.0 1884 5.0 337.0 1200 5.0 337.0 768 5.0 337.0 1884 5.0 342.0 1200 5.0 342.0 768 5.0 342.0 1884 5.0 347.0 1200 5.0 347.0 768 5.0 347.0 1884 5.0 352.0 1200 5.0 352.0 768 5.0 352.0 1884 5.0 357.0 1200 5.0 357.0 768 5.0 357.0 1884 5.0 362.0 1200 5.0 362.0 768 5.0 362.0 1884 5.0 367.0 1000 5.0 367.0 640 5.0 367.0 1570 5.0 372.0 1000 5.0 372.0 640 5.0 372.0 1570 5.0 377.0 1000 5.0 377.0 640 5.0 377.0 1570
Serial No. 13-244C Docket Nos. 50-280/281, Page 9 of 10 Table 2: Layer Thicknesses, Depths, and Vs for 3 Profiles, Surry Site Profile 1 Profile 2 Profile 3 Thickness(ft)
Depth (if)
Vs(ft/s)
Thickness(ft)
Depth (if)
Vs(ft/s)
Thickness(ft)
Depth (ft)
Vs(ft/s) 5.0 382.0 1000 5.0 382.0 640 5.0 382.0 1570 5.0 387.0 1000 5.0 387.0 640 5.0 387.0 1570 5.0 392.0 1000 5.0 392.0 640 5.0 392.0 1570 5.0 397.0 1000 5.0 397.0 640 5.0 397.0 1570 5.0 402.0 1000 5.0 402.0 640 5.0 402.0 1570 5.0 407.0 1000 5.0 407.0 640 5.0 407.0 1570 5.0 412.0 2000 5.0 412.0 1280 5.0 412.0 3140 5.0 417.0 2000 5.0 417.0 1280 5.0 417.0 3140 5.0 422.0 2000 5.0 422.0 1280 5.0 422.0 3140 5.0 427.0 2000 5.0 427.0 1280 5.0 427.0 3140 5.0 432.0 2000 5.0 432.0 1280 5.0 432.0 3140 5.0 437.0 2000 5.0 437.0 1280 5.0 437.0 3140 5.0 442.0 2000 5.0 442.0 1280 5.0 442.0 3140 5.0 447.0 2000 5.0 447.0 1280 5.0 447.0 3140 5.0 452.0 2000 5.0 452.0 1280 5.0 452.0 3140 5.0 457.0 2000 5.0 457.0 1280 5.0 457.0 3140 5.0 462.0 2000 5.0 462.0 1280 5.0 462.0 3140 5.0 467.0 2000 5.0 467.0 1280 5.0 467.0 3140 5.0 472.0 2000 5.0 472.0 1280 5.0 472.0 3140 5.0 477.0 2000 5.0 477.0 1280 5.0 477.0 3140 5.0 482.0 2000 5.0 482.0 1280 5.0 482.0 3140 5.0 487.0 2000 5.0 487.0 1280 5.0 487.0 3140 5.0 492.0 2000 5.0 492.0 1280 5.0 492.0 3140 5.0 497.0 2000 5.0 497.0 1280 5.0 497.0 3140 3.0 500.0 2000 3.0 500.0 1280 3.0 500.0 3140 7.0 507.0 2000 7.0 507.0 1280 7.0 507.0 3140 5.0 512.0 2000 5.0 512.0 1280 5.0 512.0 3140 5.0 517.0 2000 5.0 517.0 1280 5.0 517.0 3140 5.0 522.0 2000 5.0 522.0 1280 5.0 522.0 3140 5.0 527.0 2000 5.0 527.0 1280 5.0 527.0 3140 5.0 532.0 2000 5.0 532.0 1280 5.0 532.0 3140 5.0 537.0 2000 5.0 537.0 1280 5.0 537.0 3140 5.0 542.0 2000 5.0 542.0 1280 5.0 542.0 3140 5.0 547.0 2000 5.0 547.0 1280 5.0 547.0 3140 5.0 552.0 2000 5.0 552.0 1280 5.0 552.0 3140 5.0 557.0 2000 5.0 557.0 1280 5.0 557.0 3140 5.0 562.0 2000 5.0 562.0 1280 5.0 562.0 3140
Serial No. 13-244C Docket Nos. 50-280/281, Page 10 of 10 Table 2: Layer Thicknesses, Depths, and Vs for 3 Profiles, Surry Site Profile 1 Profile 2 Profile 3 Thickness(ft)
Depth (ft)
Vs(ft/s)
Thickness(ft)
Depth (ft)
Vs(ft/s)
Thickness(ft)
Depth (ft)
Vs(ft/s) 5.0 567.0 2000 5.0 567.0 1280 5.0 567.0 3140 103.3 670.3 2000 103.3 670.3 1280 103.3 670.3 3140 103.3 773.6 2000 103.3 773.6 1280 103.3 773.6 3140 103.3 876.9 2000 103.3 876.9 1280 103.3 876.9 3140 103.3 980.2 2000 103.3 980.2 1280 103.3 980.2 3140 103.3 1083.5 2000 103.3 1083.5 1280 103.3 1083.5 3140 103.3 1186.8 2000 103.3 1186.8 1280 103.3 1186.8 3140 103.3 1290.0 2000 103.3 1290.0 1280 103.3 1290.0 3140 103.3 1393.3 2000 103.3 1393.3 1280 103.3 1393.3 3140 103.3 1496.6 2000 103.3 1496.6 1280 103.3 1496.6 3140 103.3 1599.9 2000 103.3 1599.9 1280 103.3 1599.9 3140 33.3 1633.3 7000 33.3 1633.3 4480 33.3 1633.3 9285 33.3 1666.6 7000 33.3 1666.6 4480 33.3 1666.6 9285 33.3 1699.9 7000 33.3 1699.9 4480 33.3 1699.9 9285 3280.8 4980.8 9285 3280.8 4980.8 9285 3280.8 4980.8 9285