NL-15-1476, Supplement to Response to Request for Additional Information on License Request for Residual Heat Removal Pump Motor

Supplement to Response to Request for Additional Information on License Request for Residual Heat Removal Pump Motor

ML15212A940
Person / Time
Site:	Vogtle
Issue date:	07/31/2015
From:	Pierce C Southern Co, Southern Nuclear Operating Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
NL-15-1476
Download: ML15212A940 (4)

Text

Charles A. Pierce Southern Nuclear Regulatory Affairs Director Operating Company, Inc.

40 Inverness Center Parkway A

Post Office Box 1295 Birmingham , AL 35242 Tel 205.992.7872 Fax 205.992 .7601 SOUTHERN COMPANY July 31, 2015 Docket Nos.: 50-424 NL-15-1476 U.S. Nuclear Regulatory Commission ATIN: Document Control Desk Washington, D. C. 20555-0001 Vogtle Electric Generating Plant Unit 1 Supplement to Response to Request for Additional Information on License Amendment Request for Residual Heat Removal Pump Motor Ladies and Gentlemen:

By letter dated June 4, 2015 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML15155B593), Southern Nuclear Operating Company (SNC) submitted a license amendment request for the Vogtle Electric Generating Plant (VEGP), Unit 1, to revise the completion time for one inoperable residual heat removal (RHR) train from 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> to 7 days to allow for replacement of an RHR pump motor. By letter dated July 15, 2015, the Nuclear Regulatory Commission (NRC) staff issued a request for additional information (RAI); SNC responded to that request by letter dated July 22, 2015. In that letter, SNC committed to supplementing the RAI Question #1 response with revised values for the incremental conditional core damage probability (ICCDP) and the incremental conditional large early release probability (ICLERP), calculated with NRC-accepted methods.

The Enclosure provides the SNC supplemental response.

This letter contains no NRC commitments. If you have any questions, please contact Ken McElroy at (205) 992-7369.

U.S. Nuclear Regulatory Commission NL-15-1476 Page 2 Mr. C. R. Pierce states he is Regulatory Affairs Director of Southern Nuclear Operating Company, is authorized to execute this oath on behalf of Southern Nuclear Operating Company and, to the best of his knowledge and belief, the facts set forth in this letter are true.

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Enclosure:

SNC Supplemental Response to NRC RAI cc: Southern Nuclear Operating Company Mr. S. E. Kuczynski, Chairman, President & CEO Mr. D. G. Bast, Executive Vice President & Chief Nuclear Officer Mr. D. R. Madison, Vice President- Fleet Operations Mr. M.D. Meier, Vice President- Regulatory Affairs Mr. B. K. Taber, Vice President- Vogtle 1 & 2 Mr. B. J. Adams, Vice President- Engineering Mr. G. W. Gunn, Regulatory Affairs Manager- Vogtle 1 & 2 RType: CVC7000 U.S. Nuclear Regulatory Commission Mr. V. M. McCree, Regional Administrator Mr. R. E. Martin, NRR Senior Project Manager- Vogtle 1 & 2 Mr. L. M. Cain, Senior Resident Inspector- Vogtle 1 & 2 State of Georgia Mr. J. H. Turner, Director- Environmental Protection Division

Vogtle Electric Generating Plant Unit 1 Supplement to Response to Request for Additional Information on License Amendment Request for Residual Heat Removal Pump Motor Enclosure SNC Supplemental Response to NRC RAI

Enclosure to NL-15-1476 SNC Supplemental Response to NRC RAI The Vogtle Fire PRA has been refined to incorporate NRC-accepted methods.

Accordingly, the incremental conditional core damage probability (ICCDP) and the incremental conditional large early release probability (ICLERP) have been recalculated using those accepted methods.

The new values are tabulated below:

Fire PRA Methodology TotaiiCCDP Total ICLERP CT Requested Non-NRC Approved 7.47E-06 1.84E-07 7 days Methods NRC Approved Methods 7.27E-06 2.08E-07 7 days