GNRO-2013/00068, Response to Request for Information Pursuant to 10 CFR 50.54(f) Regarding the Seismic Aspects of Recommendation 2.1 of the Near-Term Task Force Review of Insights from the Fukushima Dai-ichi Accident 1.5 Year Response for CEUS Site

Response to Request for Information Pursuant to 10 CFR 50.54(f) Regarding the Seismic Aspects of Recommendation 2.1 of the Near-Term Task Force Review of Insights from the Fukushima Dai-ichi Accident 1.5 Year Response for CEUS Site

ML13254A311
Person / Time
Site:	Grand Gulf
Issue date:	09/12/2013
From:	Kevin Mulligan Entergy Operations
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
GNRO-2013/00068
Download: ML13254A311 (9)

Text

~Entergy Entergy Operations, Inc.

P. O. Box 756 Port Gibson, MS 39150 Kevin J. Mulligan Site Vice President Grand Gulf Nuclear Station Tel. (601) 437-7500 GNRO-2013/00068 September 12, 2013 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001

SUBJECT:

Entergy's Response to NRC Request for Information Pursuant to 10 CFR 50.54(f) Regarding the Seismic Aspects of Recommendation 2.1 of the Near-Term Task Force Review of Insights from the Fukushima Dai-ichi Accident - 1.5 Year Response for CEUS Sites Grand Gulf Nuclear Station, Unit 1 Docket No. 50-416 License No. NPF-29

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 (ML12053A340, GNRI-2012/00059)

2. NRC Letter, Endorsement of EPRI Final Draft Report 1025287, "Seismic Evaluation Guidance, "dated February 15, 2013 (ML12319A074)

3. EPRI Report 1025287, Seismic Evaluation Guidance: Screening, Prioritization and Implementation Details (SPIO) for the Resolution of Fukushima Near- Term Task Force Recommendation 2.1:

Seismic (ML12333A170)

4. NEI Letter to NRC, Proposed Path Forward for NTTF Recommendation 2.1: Seismic Reevaluations, dated April 9, 2013 (M L131 01 A345)

5. NRC Letter, EPRI Final Draft Report XXXXXX, "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 (ML13106A331)

6. Entergy letter to NRC, Response to NRC Request For Information Pursuant to 10 CFR 50.54(f) Regarding the Seismic Aspects of Recommendation 2.1 of the Near- Term Task Force Review of Insights from the Fukushima Dai-ichi Accident, dated April 26, 2013 (ML13119A104, GNRO-2013/00032)

GNRO-2013/00068 Page 2 of 3

Dear Sir or Madam:

On March 12, 2012, the U.S. Nuclear Regulatory Commission (NRC) issued Reference 1 to all power reactor licensees and holders of construction permits in active or deferred status. Enclosure 1 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, the Nuclear Energy Institute (NEI) submitted Reference 4 to NRC, requesting NRC agreement to delay submittal of some of the CEUS seismic hazard evaluation information so that an update to the Electric Power Research Institute (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, with the remaining seismic hazard and screening information submitted to NRC by March 31, 2014. In Reference 5, NRC agreed with this recommendation. Reference 6 contained Entergy Operations, Inc.'s (Entergy's) commitment to follow the approach described in Reference 4.

The attachment to this letter contains the requested descriptions of subsurface materials and properties and base case velocity profiles for Grand Gulf Nuclear Station (GGNS).

The information provided in the attachment to this letter is considered an interim product of seismic hazard development efforts being performed for the industry by EPRI. The complete and final seismic hazard report for GGNS will be provided to the NRC in our seismic hazard submittal by March 31,2014 in accordance with Reference 5.

This letter contains no new regulatory commitments. Should you have any questions regarding this submittal, please contact Mr. Christopher R. Robinson, Licensing Manager, at (601) 437-7326.

I declare under penalty of perjury that the foregoing is true and correct; executed on September 12,2013.

Sincerely,

~r r_

KJM/slw

Attachment:

Grand Gulf Nuclear Station's Descriptions of Subsurface Materials and Properties and Base Case Velocity Profiles Cc: (See next page)

GNRO-2013/00068 Page 3 of 3 cc: U. S. Nuclear Regulatory Commission ATTN: Steven A. Reynolds Acting Regional Administrator, Region IV 1600 East Lamar Boulevard Arlington, TX 76011-4511 U. S. Nuclear Regulatory Commission Attn: Director, Office of Nuclear Reactor Regulation Washington, DC 20555-0001 U. S. Nuclear Regulatory Commission ATTN: Mr. Alan Wang, NRRlDORL Mail Stop OWFN/8 B1 Washington, DC 20555-0001 NRC Senior Resident Inspector Grand Gulf Nuclear Station Port Gibson, MS 39150

Attachment to GNRO*2013/00068 Grand Gulf Nuclear Station's Descriptions of Subsurface Materials and Properties and Base Case Velocity Profiles

Attachment to GNRO-2013/00068 Page 1 of 5 Grand Gulf Nuclear Stations Descriptions of Subsurface Materials and Properties and Base Case Velocity Profiles Grand Gulf Site Description The basic information used to create the site geologic profile at the Grand Gulf Nuclear Station is shown in Table 1. This profile was developed using information documented in Reference 1.

As indicated in Table 1, the safe shutdown earthquake (SSE) Control Point is defined at elevation -87 feet, and the profile was modeled up to this elevation. For dynamic properties of sand, silt, and clay layers, modulus and damping curves were represented with two models.

The first model used soil curves taken from Reference 2, the second model used soil curves taken from References 3 and 4. These dynamic property models were weighted equally.

The three 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.

References

1. Entergy (2012). Site Geologic Conditions for Grand Gulf Nuclear Station, Informal report transmitted to Electric Power Research Institute (EPRI) in July 2012.

2. EPRI (1993). Guidelines for Determining Design Basis Ground Motions, Report TR-102293, Volumes 1-5, Palo Alto, CA.

3. Silva, W.J., N. A. Abrahamson, G.R. Toro, and C. Costantino (1996). Description and Validation of the Stochastic Ground Motion Model, Report submitted to Brookhaven National Laboratory, Assoc. Universities Inc., Upton NY 11973, Contract No. 770573.

4. 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.

Attachment to GNRO-2013/00068 Page 2 of 5 Table 1 - Geotechnical profile for Grand Gulf site Elev. Depth Soil Description Compression Shear Density Poissons Youngs Shear Bulk Range Wave Wave (pcf) Modulus Modulus Modulus Modulus (feet) Velocity (fps) Velocity (ksf) (ksf) (ksf) (ksf)

(fps) 197 to 70 Loess - Silt 1400 670 105 0.35 3950 1460 4390 127 127 to 20 Terrace - Silty Clay 4600 1100 119 0.47 13,200 4470 73,000 107 107 to 20 Terrace - Sand 6000 1600 125 0.46 29,000 9940 121,000 87 87 SSE Control Point at

- base mat of - - - - - - -

structures 87 to 20 Catahoula - Clay 6560 1600 120 0.47 28,000 9540 156,000 67 67 to Catahoula - Clay 17 50 and Silt with Silty 6560 1640 120 0.47 29,500 10,000 164,000 Sand Layers 17 to Catahoula - Clay

-33 50 and Silt with Silty 6400 1720 120 0.46 32,200 11,000 134,000 Sand Layers

-33 to Catahoula - Clay

-103 70 and Silt with Silty 6730 1715 120 0.47 32,200 11,000 179,000 Sand Layers

Attachment to GNRO-2013/00068 Page 3 of 5 Wm Vs profiles for Grand Gulf Site Vs (ft/sec) 0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 0

500 1000 1500 Profile 1 W

Depth (ft) 2000 Profile 2 Profile 3 2500 3000 3500 4000 4500 Figure 1 - Vs profiles for Grand Gulf site

Attachment to GNRO-2013/00068 Page 4 of 5 Table 2 - Layer thicknesses, depths, and Vs for 3 profiles, Grand Gulf 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 1600 0 1280 0 2000 10.2 10.2 1600 10.2 10.2 1280 10.2 10.2 2000 10.2 20.3 1600 10.2 20.3 1280 10.2 20.3 2000 12.5 32.8 1640 12.5 32.8 1312 12.5 32.8 2050 12.5 45.3 1640 12.5 45.3 1312 12.5 45.3 2050 4.6 49.9 1640 4.6 49.9 1312 4.6 49.9 2050 7.9 57.7 1640 7.9 57.7 1312 7.9 57.7 2050 12.5 70.2 1640 12.5 70.2 1312 12.5 70.2 2050 12.5 82.7 1720 12.5 82.7 1376 12.5 82.7 2150 12.5 95.1 1720 12.5 95.1 1376 12.5 95.1 2150 12.5 107.6 1720 12.5 107.6 1376 12.5 107.6 2150 12.5 120.1 1720 12.5 120.1 1376 12.5 120.1 2150 14.1 134.2 1715 14.1 134.2 1372 14.1 134.2 2144 14.1 148.3 1715 14.1 148.3 1372 14.1 148.3 2144 14.1 162.4 1715 14.1 162.4 1372 14.1 162.4 2144 14.1 176.5 1715 14.1 176.5 1372 14.1 176.5 2144 14.1 190.6 1715 14.1 190.6 1372 14.1 190.6 2144 17.7 208.3 1800 17.7 208.3 1312 17.7 208.3 2826 17.7 226.0 1800 17.7 226.0 1312 17.7 226.0 2826 17.7 243.8 1800 17.7 243.8 1312 17.7 243.8 2826 6.2 250.0 1800 6.2 250.0 1312 6.2 250.0 2826 44.0 294.0 1800 44.0 294.0 1312 44.0 294.0 2826 32.8 326.8 1873 32.8 326.8 1312 32.8 326.8 2941 32.8 359.6 1873 32.8 359.6 1312 32.8 359.6 2941 32.8 392.4 1873 32.8 392.4 1312 32.8 392.4 2941 40.0 432.4 2005 40.0 432.4 1283 40.0 432.4 3147 40.0 472.4 2005 40.0 472.4 1283 40.0 472.4 3147 27.6 500.0 2005 27.6 500.0 1283 27.6 500.0 3147 52.5 552.5 2005 52.5 552.5 1283 52.5 552.5 3147 40.0 592.5 2005 40.0 592.5 1283 40.0 592.5 3147 42.7 635.2 2005 42.7 635.2 1283 42.7 635.2 3147 42.7 677.8 2005 42.7 677.8 1283 42.7 677.8 3147 42.7 720.5 2005 42.7 720.5 1283 42.7 720.5 3147 65.6 786.1 2182 65.6 786.1 1396 65.6 786.1 3425 65.6 851.7 2182 65.6 851.7 1396 65.6 851.7 3425 65.6 917.3 2182 65.6 917.3 1396 65.6 917.3 3425 65.6 982.9 2182 65.6 982.9 1396 65.6 982.9 3425 65.6 1048.6 2182 65.6 1048.6 1396 65.6 1048.6 3425 65.6 1114.2 2359 65.6 1114.2 1510 65.6 1114.2 3704 65.6 1179.8 2359 65.6 1179.8 1510 65.6 1179.8 3704

Attachment to GNRO-2013/00068 Page 5 of 5 65.6 1245.4 2359 65.6 1245.4 1510 65.6 1245.4 3704 65.6 1311.0 2359 65.6 1311.0 1510 65.6 1311.0 3704 65.6 1376.6 2359 65.6 1376.6 1510 65.6 1376.6 3704 131.2 1507.9 2552 131.2 1507.9 1634 131.2 1507.9 4007 131.2 1639.1 2552 131.2 1639.1 1634 131.2 1639.1 4007 131.2 1770.3 2552 131.2 1770.3 1634 131.2 1770.3 4007 131.2 1901.6 2552 131.2 1901.6 1634 131.2 1901.6 4007 131.2 2032.8 2552 131.2 2032.8 1634 131.2 2032.8 4007 131.2 2164.0 2871 131.2 2164.0 1837 131.2 2164.0 4507 131.2 2295.3 2871 131.2 2295.3 1837 131.2 2295.3 4507 131.2 2426.5 2871 131.2 2426.5 1837 131.2 2426.5 4507 131.2 2557.7 2871 131.2 2557.7 1837 131.2 2557.7 4507 131.2 2689.0 2871 131.2 2689.0 1837 131.2 2689.0 4507 164.0 2853.0 3054 164.0 2853.0 1955 164.0 2853.0 4795 164.0 3017.1 3054 164.0 3017.1 1955 164.0 3017.1 4795 164.0 3181.1 3054 164.0 3181.1 1955 164.0 3181.1 4795 164.0 3345.1 3054 164.0 3345.1 1955 164.0 3345.1 4795 164.0 3509.2 3054 164.0 3509.2 1955 164.0 3509.2 4795 490.5 3999.7 3054 490.5 3999.7 1955 490.5 3999.7 4795 3280.8 7280.5 9285 3280.8 7280.5 9285 3280.8 7280.5 9285