CNL-14-214, Bellefonte, Units 1 and 2 - Response to Request for Additional Information Regarding Near-Term Task Force Recommendation 2.1: Seismic Hazard and Screening Report

Bellefonte, Units 1 and 2 - Response to Request for Additional Information Regarding Near-Term Task Force Recommendation 2.1: Seismic Hazard and Screening Report

ML14338A787
Person / Time
Site:	Bellefonte
Issue date:	12/03/2014
From:	James Shea Tennessee Valley Authority
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
CNL-14-214, TAC MF3944, TAC MF3945
Download: ML14338A787 (5)

Text

Tennessee Valley Authority, 1101 Market Street, Chattanooga , Tennessee 37402 CNL-14-214 December 3, 2014 10 CFR 50.4 10 CFR 50.54(f)

Attn : Document Control Desk U.S. Nuclear Regulatory Commission Washington , D.C. 20555-0001 Bellefonte Nuclear Plant, Units 1 and 2 Construction Permit Nos. CPPR-122 and CPPR-123 NRC Docket Nos. 50-438 and 50-439

Subject:

Response to Request for Additional Information Regarding Near-Term Task Force Recommendation 2.1: Seismic Hazard and Screening Report for Bellefonte Nuclear Power Plant, Units 1 and 2 (TAC NOS. MF3944 AND MF3945)

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 (ML12056A046)

2. TVA Letter to NRC , Tennessee Valley Authority's Seismic Hazard and Screening Report (CEUS Sites), Response to NRC Request for Information Pursuant to 10 CFR 50.54(f) Regarding Recommendation 2.1 of the Near-Term Task Force Review of Insights from the Fukushima Dai-ichi Accident, dated March 31 , 2014, (ML14098A478)

3. NRC Letter, Bellefonte Nuclear Plant Units 1 and 2 - Request for Additional Information Associated with Near-Term Task Force Recommendation 2.1, Seismic Hazard and Screening Report dated November 5, 2014 (TAC Nos.

MF3944 and MF3945) (ML14301A199)

On March 12, 2012 (Reference 1), the Nuclear Regulatory Commission (NRC) issued Reference 1 to all power reactor licensees and holders of construction permits in active or deferred status. On March 31 , 2014 (Reference 2) , TVA responded to Reference 1, which included the Bellefonte Seismic Hazard and Screening Report. By letter dated November 5, 2014 (Reference 3) , NRC requested additional information related to the specific source zones and Repeated Large Magnitude Earthquake used in calculating rock hazard at the Bellefonte site. In a teleconference on November 4, 2014, TVA and NRC agreed that TVA would provide the response to the RAI by December 4, 2014.

U.S. Nuclear Regulatory Commission Page 2 December 3, 2014 The enclosure to this letter contains TVA's response to the Reference 3 RAI.

There are no new regulatory commitments associated with this letter.

Should you have any questions concerning the content of this letter, please contact M. C. Bryan at (256) 57 4-8265.

I declare under penalty of perjury that the foregoing is true and correct. Executed on the 3rd day of December 2014.

resident, Nuclear Licensing

Enclosures:

cc (Enclosures) :

NRR Director- NRC Headquarters NRR JLD Director- NRC Headquarters NRC Regional Administrator- Region II NRR Project Manager- Bellefonte Nuclear Plant NRR JLD Project Manager- NRC Headquarters

ENCLOSURE Response to NRC Request for Additional Information Request for Additional Information By letters dated March 31, 2014 [Reference 1], to the U.S. Nuclear Regulatory Commission (NRC), Tennessee Valley Authority (TVA), the licensee for Bellefonte Nuclear Plant, Units 1 and 2 (Bellefonte), submitted for NRC review the Seismic Hazard and Screening Report, Pursuant to Title 10 of the Code of Federal Regulations Part 50, Section 50.54(f) (hereafter referred to as the 50.54(f) letter), Response for Information Regarding Recommendation 2.1 of the Near- Term Task Force Review of Insights from the Fukushima Dai-ichi Accident.

Review of specific source zones used in the Probabilistic Seismic Hazard Analysis (PSHA) at the Bellefonte site Chapter 4 of the SPID guidance [Reference 2} requests that licensees provide a list of Central and Eastern United States - Seismic Source Characterization sources used in conducting site specific PSHA.

The NRC Staff has reviewed the information submitted and has determined that the following additional information below is needed to complete its review.

Consistent with the 50.54(f) letter and the SPID guidance, please supplement the Seismic Hazard Screening Report Section 2.2 with the specific source zones and Repeated Large Magnitude Earthquake used in calculating rock hazard at the Bellefonte site.

Response

In accordance with the 50.54(f) letter and following the guidance in the Seismic Evaluation Guidance Screening , Prioritization and Implementation Details (SPID) (Reference 2) , a probabilistic seismic hazard analysis (PSHA) was completed using the recently developed Central and Eastern United States Seismic Source Characterization (CEUS-SSC) for Nuclear Facilities (Reference 3) together with the updated EPRI Ground-Motion Model (GMM) for the CEUS (Reference 4) . For the PSHA, a lower-bound moment magnitude of 5.0 was used , as specified in 50.54(f) letter.

For the PSHA, the CEUS-SSC background seismic source zones out to a distance of 400 miles (640 km) around Bellefonte were included . This distance exceeds the 200 mile (320 km) recommendation contained in NRC Regulatory Guide 1.208, "A performance based approach to define the site-specific earthquake ground motion" (Reference 5) and was chosen for completeness. Background sources included in this site analysis are the following:

1. Extended Continental Crust-Atlantic Margin (ECC_AM)

2. Extended Continental Crust-Gulf Coast (ECC_GC)

E1-1

3. Gulf Highly Extended Crust (GHEX)

4. Illinois Basin Extended Basement (IBEB)

5. Mesozoic and younger extended prior- narrow (MESE-N)

6. Mesozoic and younger extended prior- wide (MESE-W)

7. Midcontinent-Craton alternative A (MIDC_A)

8. Midcontinent-Craton alternative B (MIDC_B)

9. Midcontinent-Craton alternative C (MIDC_C)

10. Midcontinent-Craton alternative D (MIDC_D) 11 . Non-Mesozoic and younger extended prior- narrow (NMESE-N)

12. Non-Mesozoic and younger extended prior- wide (NMESE-W)

13. Paleozoic Extended Crust narrow (PEZ_N)

14. Paleozoic Extended Crust wide (PEZ_W)

15. Reelfoot Rift (RR)

16. Reelfoot Rift including the Rough Creek Graben (RR-RCG)

17. Study region (STUDY _R)

For sources of large magnitude earthquakes, designated "Repeated Large Magnitude Earthquake" (RLME) sources in CEUS-SSC (Reference 3), the following sources lie within 1,000 km of the site and were included in the analysis:

1. Charleston

2. Commerce

3. Eastern Rift Margin Fault northern segment (ERM-N )

4. Eastern Rift Margin Fault southern segment (ERM-S)

5. Marianna

6. Meers

7. New Madrid Fault System (NMFS)

8. Wabash Valley For each of the above background and RLME sources, the mid-continent version of the updated CEUS EPRI GMM was used (Reference 6).

References:

1. TVA Letter to NRC dated March 31 , 2014, Tennessee Valley Authority's Seismic Hazard and Screening Report (CEUS Sites) , Response to NRC Request for Information Pursuant to 10 CFR 50.54(f) Regarding Recommendation 2.1 of the Near-Term Task Force Review of Insights from the Fukushima Dai-ichi Accident (ML14098A478).

2. EPRI (2013a) . Seismic Evaluation Guidance Screening , Prioritization and Implementation Details (SPID) for the Resolution of Fukushima Near-Term Task Force Recommendation 2.1: Seismic, Elec. Power Research Institute Report 1025287, February 2013.

3. CEUS-SSC (2012) . Central and Eastern United States Seismic Source Characterization for Nuclear Facilities, U.S. Nuclear Regulatory Commission Report, NUREG-2115; EPRI Report 1021097, 6 Volumes ; DOE Report# DOE/NE-0140.

E1-2

4. EPRI (2013b) . "EPRI (2004, 2006) Ground-Motion Model (GMM) Review Project ",

Electric Power Research Institute, Palo Alto , CA, Report 3002000717 , June, 2 volumes.

5. U.S. NRC (2007) , "A performance based approach to define the site-specific earthquake ground motion ," U.S. Nuclear Regulatory Commission Reg . Guide 1.208.

6. EPRI (2013c) . "Bellefonte Seismic Hazard and Screening Report ," Electric Power Research Institute, Palo Alto , CA, dated October 29, 2013.

E1-3