ML14197A608

July 1, 2014, Summary of Category 1 Public Meeting with Tennessee Valley Authority to Discuss Seismic Hazard Reevaluations Associated with Implementation of Japan Lessons-Learned Near-Term Task Force Recommendation 2.1

ML14197A608
Person / Time
Site:	Browns Ferry, Watts Bar, Sequoyah
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: ML14197A608 (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 Jft{

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

SUMMARY

OF THE JULY 1, 2014, CATEGORY 1 PUBLIC MEETING WITH TENNESSEE VALLEY AUTHORITY TO DISCUSS SEISMIC HAZARD REEVALUATIONS ASSOCIATED WITH IMPLEMENTATION OF JAPAN LESSONS-LEARNED NEAR-TERM TASK FORCE RECOMMENDATION 2.1.

On July 1, 2014, the Nuclear Regulatory Commission (NRC or the staff) held a Category 1 public meeting 1 with Tennessee Valley Authority (TVA or the licensee) for the Watts Bar Nuclear (WBN) Plant, Units 1 and 2; Sequoyah Nuclear (SQN) Plant, Units 1 and 2 and Browns Ferry Nuclear (BFNP) Plant, Units 1, 2 and 3. The purpose of this meeting was to discuss issues resulting from the staff's screening and prioritization of the TVA 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) letter"'. By letter dated May 9, 2014, 3 the NRC staff categorized WBN as a screened in, prioritization group 1 plant with a risk evaluation due by June 30, 2017 based on the staff's screening review. SQN and BFNP were categorized as screened in, prioritization group 2 plants with risk evaluations due by December 31, 2019.

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 BFNP and SQN plants, the licensee discussed TVA's ongoing site geological profiling efforts in order to have an adequate soil characterization for both plants and stated that they understood the differences between NRC and licensee GMRS curves. For the WBN plant, the NRC staff and TVA representatives presented 4 the engineering details on the modeling inputs used to develop GMRS curves.

1 The original meeting notice is available via the Agencywide Documents Access and Management System (ADAMS) under Accession No. ML14171A354.

2 The 50.54(f) letter and Enclosure 1 are available under ADAMS Accession Nos. ML12053A340 and ML12056A047.

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

4 The NRC and TVA slides can be found under ADAMS Accession Nos. ML14182A103 and ML14182A099.

S. Whaley 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 quantity of velocity profiles used in the analysis

• The depth of reference for rock

• TVA assigned a damping value to the upper 500ft whereas the NRC used the kappa value in the upper 1000 ft to account for damping

• The manner in which epistemic uncertainty was accounted 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. 50-390, 50-391, 50-327, 50-328, 50-259, 50-260 and 50-296

Enclosure:

List of Attendees cc: Distribution via Listserv

List of Attendees U.S. Nuclear Regulatory Commission Public Meeting with Tennessee Valley Authority Concerning Seismic Hazard Reevaluation Submittals Japan Lessons-Learned Near-Term Task Force Recommendation 2.1: Seismic July 1. 2014 Name Organization Name Organization Jon Ake NRC/RES/DE Cliff Munson NRC/NRO/DSEA Andrew Mauer NEI Diane Jackson NRC/NRO/DSEA Joe Waters American Electric Power Nicholas DiFrancesco NRC/NRR/JLD Kelvin Campbell AMEC Juan Uribe NRC/NRR/JLD David Ma Argonne Michael Balazik NRC/NRR/JLD Ram Srinivasan --

Andrea Kock NRC/NRO/DSEA Joe Litehiser Bechtel Donnie Harrison NRC/NRO/DSRA Walt Silva Pacific Engineering Rasool Anooshehpool NRC/RES/DE Jose Blanco Rizzo Associates Nilesh Choksi NRC/NRO/DSEA Nadja Paulman XE Nuclear Joe Shea TVA John Richards EPRI Kevin Dutton TVA Dan Ludwig XE Nuclear Penny Selman TVA Andy Hen NRC/NRR/DORL Kevin Casey TVA Lief Erickson Curtis Wright Robert Enis TVA Adam Helffrich Rizzo Associates Joshua Best TVA Zhiping Li Ameren Walter Justice TVA Brenda Kovarik American Electric Power Justin Huber TVA (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 Lessons-Learned Division 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 Enclosure

Name Organization Name Organization Alice Carson Bechtel Robin McGuire Lettisci Nish Vaidya Rizzo Associates Pete Gaillard TVA Rob Sewell Structint

• .. ML14197A608 *Concurrence via e-mail OFFICE NRR/JLD/PMB/PM NRR/JLD/LA NRR/JLD/PMB/BC NAME JUri be Slent SWhal~

DATE 08/06/14 07/07/14 07/30/14