ML13092A363

3/25/2013 - Oconee Nuclear Station, Units 1, 2, and 3 - Summary of Meeting with Duke Energy Carolinas, LLC, to Discuss the Flood Hazard Reevaluation Report

ML13092A363
Person / Time
Site:	Oconee
Issue date:	04/04/2013
From:	Boska J Plant Licensing Branch II
To:	Duke Energy Carolinas
Boska, J P
Shared Package
Ml13092A368	List: ML13092A363
References
TAC MF1012, TAC MF1013, TAC MF1014
Download: ML13092A363 (4)

Text

UNITED STA"rES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 April 4, 2013 LICENSEE: Duke Energy Carolinas, LLC FACILITY: Oconee Nuclear Station, Units 1, 2, and 3

SUMMARY

OF MARCH 25,2013, MEETING WITH DUKE ENERGY CAROLINAS, LLC, TO DISCUSS THE FLOOD HAZARD REEVALUATION REPORT FOR THE OCONEE NUCLEAR STATION, UNITS 1,2, AND 3 (TAC NOS. MF1012, MF1013, AND MF1014)

On March 25,2013, a Category 1 public meeting was held among staff from the U.S. Nuclear Regulatory Commission (NRC) and representatives of Duke Energy Carolinas, LLC (Duke or the licensee) at NRC Headquarters, One White Flint North, 11555 Rockville Pike, Rockville, Maryland. A list of attendees is enclosed. The purpose of the meeting was to allow the licensee to discuss their flood hazard reevaluation report for external flooding at the Oconee Nuclear Station, Units 1, 2, and 3 (ONS). The NRC requested this reevaluation from all commercial power reactors as part of the NRC's Fukushima lessons-learned process, as stated in an NRC letter dated March 12, 2012, Agencywide Documents Access and Management System (ADAMS) Accession No. ML12053A340. The licensee submitted this report to the NRC by letter dated March 12, 2013, ADAMS Accession No. ML13079A227.

The licensee's presentation is found in the meeting slides (ADAMS Accession No. ML13084A022). The licensee first reviewed the previous failure analysis for the Jocassee Dam.

The NRC evaluation of the previous analysis was issued on January 28, 2011. The licensee then reviewed their revised failure analysis for the Jocassee Dam, which they submitted to the NRC in the flood hazard reevaluation report. There were significant differences between the two dam failure analyses. The licensee stated that the previous failure analysis was very conservative, and that the revised analysis is more realistic, although they still consider it to be conservative. Both analyses concluded that overtopping of the dam due to factors such as intense precipitation or failure of upstream dams was not a credible failure mode. Both analyses also concluded that seismic failure of the Jocassee Dam was not a credible failure mode, due to the seismic ruggedness of the dam and the predicted seismic hazard in that location.

The licensee stated that they had revised the dam breach analysis model, and showed slides with the modeling results. The flood hazard reevaluation report is based on the Xu and Zhang, 2009, model for dam breach parameters. This model results in lower breach flow rates, along with other parameter changes. The NRC staff noted that they did not have much experience with the Xu and Zhang model and would have to perform a detailed review.

-2 Public Meeting Feedback forms were made available at the meeting. As of the date of this meeting summary, no completed feedback forms have been received.

Please direct any inquiries to me at 301-415-2901, or by email to John.Boska@nrc.gov.

(kQ.~

z:;{?~~. ~. Boska, Senior Project Manager Plant Licensing Branch 11-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-269, 50-270, and 50-287

Enclosure:

List of Attendees cc w/encls: Distribution via Listserv

UNITED STATES NUCLEAR REGULATORY COMMISSION MEETING ATTENDANCE FORM

Subject:

Oconee Nuclear Station Flooding Hazard Reevaluation Report Date: March 25, 2013 Location: NRC HQ OWFN Room 0-1384 PLEASE PRINT LEGIBLY NAME ORGANIZATION N "Co I N ftR..

-2 Public Meeting Feedback forms were made available at the meeting. As of the date of this meeting summary, no completed feedback forms have been received.

Please direct any inquiries to me at 301-415-2901, or by email to John. Boska@nrc.gov.

IRA!

John P. Boska, Senior Project Manager Plant Licensing Branch 11-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-269, 50-270, and 50-287

Enclosure:

List of Attendees cc w/encls: Distribution via Listserv DISTRIBUTION:

PUBLIC RPascarelli, NRR JMonninger, NRR MBensi, NRO LPL2-1 r/f RidsNrrDorl GWilson, NRR EDavidson, NRR RidsNrrDorlLpl2-1 Resource EMiller, NRR CCook, NRR KSee, NRO RidsNrrPMOconee KManoly, NRR JUribe, NRR JKanney, RES RidsNrrLASFigueroa RidsRgn2MailCenter Package ADAMS Accession No. Package ML13092A368 Notice: ML13077A178 Slides: ML13084A022 Summary: ML13092A363 OFFICE DORLlLPL2-1/PM DORLlLPL2-1/LA DORLlLPL2-1/BC DORLlLPL2-1/PM NAME JBoska SFigueroa RPascarelli JBoska DATE 04/02/13 04/04/13 04/04/13 04/04/13 OFFICIAL RECORD COpy