ONS-2015-011, Submittal of Revised Flood Hazard Reevaluation Report Per Nrc'S Request for Additional Information

Submittal of Revised Flood Hazard Reevaluation Report Per Nrc'S Request for Additional Information

ML15072A106
Person / Time
Site:	Oconee
Issue date:	03/06/2015
From:	Batson S Duke Energy Carolinas, Duke Energy Corp
To:	Document Control Desk, Office of Nuclear Reactor Regulation
Shared Package
ML15072A099	List: ONS-2015-011, Submittal of Revised Flood Hazard Reevaluation Report Per Nrc'S Request for Additional Information
References
ONS-2015-011, TAC MF1012, TAC MF1013, TAC MF1014
Download: ML15072A106 (4)

Text

DUKE Scott L. Batson Vice President Oconee Nuclear Station ENERGY. Duke Energy ONOI VP 17800 RochesterHwy Seneca, SC 29672 o: 864.873.3274 f 864.873. 4208 ONS-2015-011 Scoff.Batson@duke-energy.com March 6, 2015 ATTN: Document Control Desk 10 CFR 50.54(f)

U.S. Nuclear Regulatory Commission (NRC)

Washington, DC 20555 Duke Energy Carolinas, LLC (Duke Energy)

Oconee Nuclear Station, Units 1, 2 and 3 Docket Numbers 50-269, 50-270, 50-287 Renewed License Numbers DPR-38, DPR-47, and DPR-55

Subject:

Revised Flood Hazard Reevaluation Report per NRC's Request for Additional Information.

References:

1. NRC Letter, Request for Information Pursuantto 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-ichiAccident, dated March 12, 2012, (ADAMS Accession No. ML12053A340)

2. Duke Energy Letter, Flood Hazard Reevaluation Report in response to NRC letter, "Request for Information Pursuantto Title 10 of the Code of FederalRegulations 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-ichiAccident,"dated March 12, 2013

3. NRC Letter, Oconee Nuclear Station, Units 1, 2, and 3, Request for Additional Information Regarding Fukushima Lessons Learned Flood Hazard Reevaluation Report (TAC Nos. MF1012, MF1013, AND MF1014), dated March 20, 2014, (ADAMS Accession No. ML14064A591)

4. NRC E-Mail, Request for Additional Information - Oconee Flooding Hazard Reevaluation Report (TAC NOS. MF1012, MF1013, AND MF1014), dated September 15, 2014, (ADAMS Accession No. ML14258B222)

5. Duke Energy Letter, Schedule to Respond to a Request for Additional Information Regarding the Reanalysis of an Upstream Dam Flood, dated October 15, 2014, (ADAMS Accession No. ML14293A043)

6. NRC Letter; CAL 2-10-003: ConfirmatoryAction Letter - Oconee Nuclear Station, Units 1, 2, and 3 Commitments to addressexternal Flooding Concerns,dated June 22, 2010, (ADAMS Accession No. ML101730329) contains Security Sensitive Information; withhold from public per 10 CFR 2.390(d)(1)

Upon removal of Enclosure 1, this letter is uncontrolled.

ONS-2015-011 March 6, 2015 Page 2 Ladies and Gentlemen, Duke Energy submitted the Flood Hazard Reevaluation Report (FHRR) for Oconee Nuclear Station (ONS) on March 12, 2013 (Reference 2) pursuant to the NRC's 10 CFR 50.54(f) request dated March 12, 2012 (Reference 1).

By E-mail dated September 15, 2014 (Reference 4), the NRC transmitted a Request for Additional Information (RAI) regarding Oconee's flood analysis of a postulated upstream dam failure. That RAI requested the dam failure be re-analyzed by applying alternate breach methodologies.

Because the new analysis would impact the information in the original FHRR, and affect several responses to a previous RAI (Reference 3), ONS submitted an RAI response on October 15, 2014 (Reference 5) that provided an action plan to revise the FHRR and to address any previous RAI responses affected by that revision. This letter submits the deliverables of that action plan.

Enclosure 1 to this letter is the revised "FloodHazardReevaluation Report"for Oconee Nuclear Station. It incorporates the results of a revised flood analysis which utilizes alternate breach methodologies, as requested by the September 15, 2014 RAI. It also incorporates a recently completed seismic analysis specific to the Jocassee Dam, which satisfies the request framed by RAIl of the March 20, 2014 RAI.

When preparing Duke Energy's October 15, 2014 response, it was recognized that the FHRR revision would impact the previous response to RAIsl 1 through 15 of the March 20, 2014 RAI.

The updated answers to RAIs-1 1 and 12, are now contained in the appropriate sections of the enclosed report. RAI-13 requested electronic input and output files for the dam breach computer model applicable to the FHRR. This letter transmits the new model files implemented in the revised FHRR as attachments (the files will be on electronic media). The new responses to RAIs14 and 15 are provided in Section 5 of the revised FHRR.

Enclosure 1 contains Security Sensitive information and is requested to be withheld from public disclosure in accordance with 10 CFR 2.390(d).

This letter does not create nor revise any Regulatory Commitments.

Should you have any questions concerning this letter, or require additional information, please contact Bryan McCabe at (919) 812-8324.

I declare under penalty of perjury that the foregoing is true and correct. Executed on March 6, 2015.

Sincerely, Scott L. Batson Vice President Oconee Nuclear Station Enclosure I contains Security Sensitive Information; withhold from public per 10 CFR 2.390(d)(1)

Upon removal of Enclosure 1, this letteris uncontrolled.

ONS-2015-011 March 6, 2015 Page 3

Enclosures:

1. Revision 1 to Flood Hazard Reevaluation Report - Oconee Nuclear Station Attachments:

1. Computer support Files on CD:

Oconee Nuclear Station, Upstream Dam Failure 1-D Hydraulic Modeling -

HECRAS Ver. 4.1 Input/Output Files, January 28, 2015

2. Computer support Files on CD:

Oconee Nuclear Station, Upstream Dam Failure 2-D Hydraulic Modeling -

TUFLOW FV Ver. 2014.01.007, January 28, 2015 Note: The Attached electronic media are computer files being transmitted to the Japan Lessons Learned Division for input to their software.

The files are not documents and are incompatible with printing. contains Security Sensitive Information; withhold from public per 10 CFR 2.390(d)(1)

Upon removal of Enclosure 1, this letteris uncontrolled.

ONS-2015-011 March 6, 2015 Page 4 cc: (with Enclosure only)

Mr. Victor McCree, Regional Administrator U.S. Nuclear Regulatory Commission - Region II Marquis One Tower 245 Peachtree Center Ave., NE Suite 1200 Atlanta, Georgia 30303-1257 Mr. William Dean, Director, Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission One White Flint North 11555 Rockville Pike Rockville, MD 20852-2738 Mr. Jeffery Whited (by electronic mail only)

U.S. Nuclear Regulatory Commission 11555 Rockville Pike Mail Stop 0-811A Rockville, MD 20852 Mr. Nicholas DiFrancesco, Project Manager (Seismic Walkdowns and Reevaluations)

(by electronic mail only)

U.S. Nuclear Regulatory Commission 11555 Rockville Pike Mail Stop 0-1 3C5 Rockville, MD 20852 Mr. Eddy Crowe NRC Senior Resident Inspector Oconee Nuclear Station cc (with Enclosure and 2 copies of Attachment):

Mr. James R. Hall, Project Manager (ONS)

(by electronic mail only)

US. Nuclear Regulatory Commission 11555 Rockville Pike Mail Stop O-8G9A Rockville, MD 20852 cc (with Enclosure and 3 copies of Attachment):

Mr. Robert F. Kuntz, Senior Project Manager (NRR/JLD/JHMB)

U.S. Nuclear Regulatory Commission 11555 Rockville Pike Mail Stop O-13F15 Rockville, MD 20852 contains Security Sensitive Information; withhold from public per 10 CFR 2.390(d)(1)

Upon removal of Enclosure 1, this letter is uncontrolled.