ND-18-1030, Supplement to Response to NRC Bulletin 2012-01, Design Vulnerability in Electric Power System

Supplement to Response to NRC Bulletin 2012-01, Design Vulnerability in Electric Power System

ML18242A012
Person / Time
Site:	Vogtle
Issue date:	08/29/2018
From:	Klecha J Southern Nuclear Operating Co
To:	Document Control Desk, Office of New Reactors
References
BL-12-001, ND-18-1030
Download: ML18242A012 (5)

Text

bk. Southern Nuclear Joseph B. Klecha IV Vice President, Site Operations 7825 River Road Waynesboro, Georgia 30830 Vogtle Units 3&4 706 848 6888 tel 205 234 9108 cell AU6 2 9 2018 jbklectia @souttiernco.com Docket Nos.: 52-025 ND-18-1030 52-026 10CFR 52.3(b)(1)

U.S. Nuclear Regulatory Commission Document Control Desk Washington, DC 20555-0001 Southern Nuclear Operating Company Vogtle Electric Generating Plant Unit 3 and Unit 4 Supplement to Response to NRC Bulletin 2012-01. Design Vulnerabilitv in Electric Power System Ladies and Gentlemen:

On July 22, 2015, Southern Nuclear Operating Company (SNC), the licensee for Vogtle Electric Generating Plant (VEGP) Units 3 and 4, provided a supplemental response to Nuclear Regulatory Commission (NRC)Bulletin 2012-01, Design Vulnerability In Electric Power System, (Agencywide Documents Access and Management System (ADAMS) Accession No. ML15226A058). That supplemental response stated SNC would complete the analysis and modifications to detect an open phase condition prior to fuel load for Units 3 and 4.

The purpose of this supplement is to notify the NRC of a reversion to those commitment completion dates such that the analysis and modifications to detect an open phase condition at Units 3 and 4 will be completed by the end of each Unit's second maintenance/refueling outage, as originally committed by SNC (ADAMS Accession No. ML15030A357). The Enclosure to this letter provides the revised regulatory commitments and a basis for the commitment date changes.

These commitment changes have been evaluated in accordance with the Nuclear Energy Institute guidance document NEI 99-04, "Guidelines for Managing NRC Commitment Changes."

Should you have questions, please contact Kelli Roberts, at 706-848-6991.

• fA.

I declare under penalty of perjury that the foregoing is true and correct. Executed on the day of August 2018.

Respectfully submitted.

Joseph B. Klecha Vice President, Site Operations of Vogtle 3 & 4

Enclosure:

Vogtle Electric Generating Plant (VEGP) Unit 3 & Unit 4 Updated Schedule for Completion of Analysis and Modifications to Detect an Open Phase Condition JBK/RAS/amw

U.S. Nuclear Regulatory Commission ND-18-1030 Page 2 of 3 go:

Southern Nuclear Operating Comoanv / Georgia Power Comoanv Mr. S. E. Kuczynski Mr. J. B. Klecha Mr. G. Chick Mr. D. G. Best Mr. M. D. Meier Mr. D. H. Jones Mr. D. L. McKlnney Mr. T.W. Yeiverton Mr. B. H. Whitiey Mr. C. R. Pierce Ms. A. G. Aughtman Mr. W. A. Sparkman Ms. A. C. Chamberlain Mr. O. J. Miller Mr. J. D. Williams Mr. M. J. Yox Ms. A. Pugh Ms. K. A. Roberts Ms. K. M. Stacy Mr. C. T. Defnall Document Services RTYPE: VND.LI.LOO File AR.01.02.06 Nuclear Reoulatorv Commission Mr. W. Jones Ms. J. M. Heisserer Mr. C. P. Patel Mr. M. E. Ernstes Mr. G. J. Khouri Ms. S. E. Temple Mr. A. J. Lerch Mr. C. J. Even Mr. S. A. Walker Mr. B. J. Kemker Ms. C.D. Taylor Mr. T. McGinty Mr. R. Taylor OolethorDe Power Corporation Mr. M. W. Price Mr. K. T. Haynes Municioal Electric Authoritv of Georoia Mr. J. E. Fuller Mr. S. M. Jackson

U.S. Nuclear Regulatory Commission ND-18-1030 Page 3 of 3 Dalton Utilities Mr. D. Cope Westinahouse Electric Company. LLC Dr. L. Oriani Mr. D. C. Durham Ms. L. G. iller Mr. D. Hawkins Ms. J. Monahan Mr. J. L. Coward Mr. M. M. Corletti Other Dr. W. R. Jacobs, Jr., Ph.D., CDS Associates, Inc.

Mr. 8. Roetger, Georgia Public Service Commission Ms. S. W. Kernizan, Georgia Public Service Commission Mr. K. C. Greene, Troutman Sanders Mr. S. Blanton, Balch Bingham

Southern Nuclear Operating Company ND-18-1030 Enclosure Vogtle Electric Generating Plant (VEGP) Unit 3 & Unit 4 Updated Schedule for Completion of Analysis and Modifications to Detect an Open Phase Condition (This Enclosure consists of 2 pages, Including this cover page)

Revised Commitments The following table identifies those actions committed to by the Southern Nuclear Operating Company in this submittal. Any other statements are provided for information purposes and are not considered to be regulatory commitments. Please direct questions regarding these commitments to Kelli Roberts at (706) 848-6991.

REGULATORY COMMITMENTS DUE DATE/EVENT

1. VEGP Unit 3 will perform the necessary By the end of the VEGP Unit 3 second analysis and implement any subsequent maintenance/refueling outage.

modifications to ensure that operations personnel can adequately detect an open phase condition and that the detection should alarm in the main control room.

2. VEGP Unit 4 will perform the necessary By the end of the VEGP Unit 4 second analysis and implement any subsequent maintenance/refueling outage.

modifications to ensure that operations personnel can adequately detect an open phase condition and that the detection should alarm in the main control room.

Basis for Commitment Completion Date Changes This Regulatory Commitment was originally made in recognition of a significant industry event that was identified via the SNC operating experience (OE) program and the revised commitment completion due date is being made to support revised station priorities.

The (approximate) 36-month delay in implementing the actions to address the open phase condition identified in NRC Bulletin 2012-01 (the basis of the actions proposed in this commitment) is not significant to safety.

Specifically, in the API 000 design, the open phase event is the failure ofa non-safety component which has no effect on safety related functions. The offsite circuit is not safety-related, and the API000 does not attribute a defense-in-depth function to the offsitecircuit for maintaining reactor safety.

SNC's previousBulletin 2012-01 and RAI responses (e.g., SNC letter no. ND-15-0133, ADAMS accession no. ML15030A357), demonstrated that the API000 design is in compliance with GDC 17, and as concurred with by the NRC staff during October 30, 2014 public meeting, the open phase event failure is not a safety concem for the API 000 design.

Accordingly, the extension of the completion due dates for these commitments will not negatively impact the ability of a system, structure or component (SSC) to perform itssafety function or negatively impact the ability of licensee personnei to ensure the SSC is capable of performing its intended safety function.

Enclosure Page 2

Text

bk. Southern Nuclear Joseph B. Klecha IV Vice President, Site Operations 7825 River Road Waynesboro, Georgia 30830 Vogtle Units 3&4 706 848 6888 tel 205 234 9108 cell AU6 2 9 2018 jbklectia @souttiernco.com Docket Nos.: 52-025 ND-18-1030 52-026 10CFR 52.3(b)(1)

U.S. Nuclear Regulatory Commission Document Control Desk Washington, DC 20555-0001 Southern Nuclear Operating Company Vogtle Electric Generating Plant Unit 3 and Unit 4 Supplement to Response to NRC Bulletin 2012-01. Design Vulnerabilitv in Electric Power System Ladies and Gentlemen:

On July 22, 2015, Southern Nuclear Operating Company (SNC), the licensee for Vogtle Electric Generating Plant (VEGP) Units 3 and 4, provided a supplemental response to Nuclear Regulatory Commission (NRC)Bulletin 2012-01, Design Vulnerability In Electric Power System, (Agencywide Documents Access and Management System (ADAMS) Accession No. ML15226A058). That supplemental response stated SNC would complete the analysis and modifications to detect an open phase condition prior to fuel load for Units 3 and 4.

The purpose of this supplement is to notify the NRC of a reversion to those commitment completion dates such that the analysis and modifications to detect an open phase condition at Units 3 and 4 will be completed by the end of each Unit's second maintenance/refueling outage, as originally committed by SNC (ADAMS Accession No. ML15030A357). The Enclosure to this letter provides the revised regulatory commitments and a basis for the commitment date changes.

These commitment changes have been evaluated in accordance with the Nuclear Energy Institute guidance document NEI 99-04, "Guidelines for Managing NRC Commitment Changes."

Should you have questions, please contact Kelli Roberts, at 706-848-6991.

• fA.

I declare under penalty of perjury that the foregoing is true and correct. Executed on the day of August 2018.

Respectfully submitted.

Joseph B. Klecha Vice President, Site Operations of Vogtle 3 & 4

Enclosure:

Vogtle Electric Generating Plant (VEGP) Unit 3 & Unit 4 Updated Schedule for Completion of Analysis and Modifications to Detect an Open Phase Condition JBK/RAS/amw

U.S. Nuclear Regulatory Commission ND-18-1030 Page 2 of 3 go:

Southern Nuclear Operating Comoanv / Georgia Power Comoanv Mr. S. E. Kuczynski Mr. J. B. Klecha Mr. G. Chick Mr. D. G. Best Mr. M. D. Meier Mr. D. H. Jones Mr. D. L. McKlnney Mr. T.W. Yeiverton Mr. B. H. Whitiey Mr. C. R. Pierce Ms. A. G. Aughtman Mr. W. A. Sparkman Ms. A. C. Chamberlain Mr. O. J. Miller Mr. J. D. Williams Mr. M. J. Yox Ms. A. Pugh Ms. K. A. Roberts Ms. K. M. Stacy Mr. C. T. Defnall Document Services RTYPE: VND.LI.LOO File AR.01.02.06 Nuclear Reoulatorv Commission Mr. W. Jones Ms. J. M. Heisserer Mr. C. P. Patel Mr. M. E. Ernstes Mr. G. J. Khouri Ms. S. E. Temple Mr. A. J. Lerch Mr. C. J. Even Mr. S. A. Walker Mr. B. J. Kemker Ms. C.D. Taylor Mr. T. McGinty Mr. R. Taylor OolethorDe Power Corporation Mr. M. W. Price Mr. K. T. Haynes Municioal Electric Authoritv of Georoia Mr. J. E. Fuller Mr. S. M. Jackson

U.S. Nuclear Regulatory Commission ND-18-1030 Page 3 of 3 Dalton Utilities Mr. D. Cope Westinahouse Electric Company. LLC Dr. L. Oriani Mr. D. C. Durham Ms. L. G. iller Mr. D. Hawkins Ms. J. Monahan Mr. J. L. Coward Mr. M. M. Corletti Other Dr. W. R. Jacobs, Jr., Ph.D., CDS Associates, Inc.

Mr. 8. Roetger, Georgia Public Service Commission Ms. S. W. Kernizan, Georgia Public Service Commission Mr. K. C. Greene, Troutman Sanders Mr. S. Blanton, Balch Bingham

Southern Nuclear Operating Company ND-18-1030 Enclosure Vogtle Electric Generating Plant (VEGP) Unit 3 & Unit 4 Updated Schedule for Completion of Analysis and Modifications to Detect an Open Phase Condition (This Enclosure consists of 2 pages, Including this cover page)

Revised Commitments The following table identifies those actions committed to by the Southern Nuclear Operating Company in this submittal. Any other statements are provided for information purposes and are not considered to be regulatory commitments. Please direct questions regarding these commitments to Kelli Roberts at (706) 848-6991.

REGULATORY COMMITMENTS DUE DATE/EVENT

1. VEGP Unit 3 will perform the necessary By the end of the VEGP Unit 3 second analysis and implement any subsequent maintenance/refueling outage.

modifications to ensure that operations personnel can adequately detect an open phase condition and that the detection should alarm in the main control room.

2. VEGP Unit 4 will perform the necessary By the end of the VEGP Unit 4 second analysis and implement any subsequent maintenance/refueling outage.

modifications to ensure that operations personnel can adequately detect an open phase condition and that the detection should alarm in the main control room.

Basis for Commitment Completion Date Changes This Regulatory Commitment was originally made in recognition of a significant industry event that was identified via the SNC operating experience (OE) program and the revised commitment completion due date is being made to support revised station priorities.

The (approximate) 36-month delay in implementing the actions to address the open phase condition identified in NRC Bulletin 2012-01 (the basis of the actions proposed in this commitment) is not significant to safety.

Specifically, in the API 000 design, the open phase event is the failure ofa non-safety component which has no effect on safety related functions. The offsite circuit is not safety-related, and the API000 does not attribute a defense-in-depth function to the offsitecircuit for maintaining reactor safety.

SNC's previousBulletin 2012-01 and RAI responses (e.g., SNC letter no. ND-15-0133, ADAMS accession no. ML15030A357), demonstrated that the API000 design is in compliance with GDC 17, and as concurred with by the NRC staff during October 30, 2014 public meeting, the open phase event failure is not a safety concem for the API 000 design.

Accordingly, the extension of the completion due dates for these commitments will not negatively impact the ability of a system, structure or component (SSC) to perform itssafety function or negatively impact the ability of licensee personnei to ensure the SSC is capable of performing its intended safety function.

Enclosure Page 2