ML14197A593

June 26, 2014, Summary of Category 1 Public Meeting with Southern Nuclear Operating Company to Discuss Seismic Hazard Reevaluations Associated with Implementation of Japan Lessons-Learned Near-Term Task Force Recommendation 2.1

ML14197A593
Person / Time
Site:	Farley
Issue date:	08/06/2014
From:	Juan Uribe Japan Lessons-Learned Division
To:	Whaley S Japan Lessons-Learned Division
Uribe J, NRR/JLD, 415-3809
References
Download: ML14197A593 (5)

Text

UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 August 6, 2014 MEMORANDUM TO: Sheena A. Whaley, Chief Hazards Management Branch Japan Lessons-Learned Division Office of Nuclear Reactor Regulation FROM: Juan F. Uribe, Project Manager .::7ft.{

Hazards Management Branch Japan Lessons-Learned Division Office of Nuclear Reactor Regulation

SUMMARY

OF THE JUNE 26, 2014, CATEGORY 1 PUBLIC MEETING WITH SOUTHER NUCLEAR OPERATING COMPANY TO DISCUSS SEISMIC HAZARD REEVALUATIONS ASSOCIATED WITH IMPLEMENTATION OF JAPAN LESSONS-LEARNED NEAR-TERM TASK FORCE RECOMMENDATION 2.1.

On June 26, 2014, the Nuclear Regulatory Commission (NRC or the staff) held a Category 1 public meeting 1 with Southern Nuclear Operating Company (SNC or the licensee) for the Edwin I. Hatch Nuclear Plant, Units 1 and 2 (Hatch) and the Joseph M. Farley Nuclear Plant, Units 1 and 2 (Farley). The purpose of this meeting was to discuss issues resulting from the staff's screening and prioritization of the Hatch and Farley Nuclear Plants related to Enclosure 1, Recommendation 2.1: Seismic of the March 12, 2012, NRC request for information per Title 10 to the Code of Federal Regulations, Section 50.54(f) lette~. By letter dated May 9, 2014, 3 the NRC staff categorized the Hatch Nuclear Plant as a screened in. prioritization group 2 plant with a risk evaluation due by December 31, 2019 based on the staff's screening review. The Farley Nuclear plant was categorized as a screened out plant, subject to limited scope evaluation. By memo dated May 21, 2014, the NRC staff documented their preliminary Ground Motion Response Spectra (GMRS) curve in comparison to all licensee GMRS curves along with the plant's Safe Shutdown Earthquake (SSE) and Individual Plant Examination of Eternal Events (IPEEE) High Confidence Low Probability of Failure (HCLPF) Spectra, also known as the IHS (IPEEE HCLPF Spectra). The public meeting supported an information exchange and understanding of engineering differences to achieve subsequent technical resolution.

In regards to the Farley Nuclear Plant, the licensee discussed Farley's ongoing seismic risk-informed efforts that may inform development of a low-frequency evaluation. NRC staff and licensee agreed on a follow-up discussion in the near-future.

1 The original meeting notice is available via the Agencywide Documents Access and Management System (ADAMS) under Accession No.ML14171A181.

2 The 50.54(f) letter and Enclosure 1 are available under ADAMS Accession No. ML12053A340 and ML12056A047.

3 The May 9, 20141etter is available under ADAMS Accession No. ML14111A147.

S. Whaley For the Hatch Nuclear Plant, the NRC staff and SNC representatives presented 4 the engineering details on the modeling inputs used to develop GMRS curves. The meeting highlights included:

• NRC and licensee discussed differences in methods used to calculate kappa (i.e. soil seismic energy damping)

• NRC and licensee discussed differences in velocity profiles, available onsite data, and modeling epistemic uncertainties represented in the profiles

• Based on interactions the NRC staff would consider licensee information and develop a request for additional information to resolve differences In summary, the NRC staff stated that the primary differences between the NRC staff and licensee GMRS curves appear to result from:

• The different kappa value used by SNC and NRC

• Apparent inconsistencies between deep soil site characteristics and shear wave velocities for base cases

• Large differences in shear wave velocities below depths of 500 ft due to an assumed Poisson's ratio.

Finally, the NRC stated that a follow up request for additional information may be issued to document the licensee's technical basis and background information, as well as any other clarifications associated with the information presented at the meeting.

No regulatory decisions or commitments were made during the meeting. The public was invited to observe the meeting and was given several opportunities to communicate with the NRC during the public meeting and before adjourning. The NRC staff received no public comments and no meeting feedback forms.

CONTACT: Juan F. Uribe, NRR/JLD/JHMB 301-415-3809 Docket Nos. 50-321, 50-366, 50-348 and 50-364

Enclosure:

List of Attendees cc: Distribution via Listserv 4

The NRC and SNC slides can be found under ADAMS Accession No. ML14177A086 and ML141768239.

List of Attendees U.S. Nuclear Regulatory Commission Public Meeting with Southern Nuclear Operating Company Concerning Seismic Hazard Reevaluation Submittals Japan Lessons-Learned Near-Term Task Force Recommendation 2.1: Seismic June 26. 2014 Name Organization Name Organization Jon Ake NRC/RES/DE Robert Martin NRC/NRR/DORL Cliff Munson NRC/NRO/DSEA Nick Grayer --

Diane Jackson NRC/NRO/DSEA Mike Louis --

Nicholas DiFrancesco NRC/NRR/JLD Melanie Brown SNC Juan Uribe NRC/NRR/JLD Walter Richards --

Michael Balazik NRC/NRR/JLD Walter Justice --

Sarah Tabatabai NRC/NRO/DSEA Richard Roer Xcel Energy Mahmoud Jardaneh NRC/NRO/DSEA Lauren Gibson NRC/NRR/JLD Andrea Kock NRC/NRO/DSEA Walter Justice TVA Ricardo Rodriguez NRC/NRO/DSEA Nick Gregor Bechtel Farhang Ostuden Bechtel Mike Lewis Bechtel John Giddens SNC Terry Mitchell SNC Donald Moore SNC David Ma Argonne National Lab Tarek Elkhoraibi Bechtel Justin Huber TVA Andrew Mauer NEI Randy Bunt SNC John Damm Bechtel Robert Miller SNC John Anderson DC Cook Ronald Wittschen SNC Charles Pierce SNC (continues to next page)

Abbreviations:

DE - Division of Engineering DSEA - Division of Site Safety and Environmental Analysis DSRA - Division of Safety Systems & Risk Assessment EPRI - Electric Power Research Institute IPT- International Program Team JLD - Japan Lesson Learned Project Directorate NRO - Office of New Reactors NRR - Office of Nuclear Reactor Regulation RES - Office of Nuclear Regulatory Research NEI - Nuclear Energy Institute TVA- Tennessee Valley Authority SNC - Southern Nuclear Operating Company, Inc.

Enclosure

Name Organization Name Organization American Electric Brenda Kovarik Power Jose Blanco Rizzo Asociates Albert Kottke Bechtel Paul Guill Duke Energy Melanie Brown SNC John Richards EPRI Richard Rohrer XE Nuclear

• .. ML14197A593 *Concurrence via e-mail OFFICE NRR/JLD/PMB/PM NRR/JLD/LA* NRR/JLD/PMB/BC NAME JUri be SLent SWhaley DATE 08/06/14 07/07/14 07/30/14