ML18249A046

Regulatory Audit Summary Regarding for License Amendment Requests to Revise Risk-Informed Extended Completion Times

ML18249A046
Person / Time
Site:	Mcguire, Catawba, McGuire
Issue date:	09/20/2018
From:	Michael Mahoney Plant Licensing Branch II
To:	Capps S Duke Energy Carolinas
Mahoney M, NRR/DORL/LPL2-1, 415-3867
References
EPID L-2017-LLA-0256, EPID L-2017-LLA-0257
Download: ML18249A046 (6)

Text

UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 September 20, 2018 Mr. Steven D. Capps Senior Vice President Nuclear Corporate Duke Energy Corporation 526 South Church Street, EC-07H Charlotte, NC 28202

SUBJECT:

CATAWBA NUCLEAR STATION UNITS 1 AND 2 AND MCGUIRE NUCLEAR STATION UNITS 1 AND 2-REGULATORY AUDIT

SUMMARY

REGARDING LICENSE AMENDMENT REQUESTS TO REVISE RISK-INFORMED EXTENDED COMPLETION TIMES (EPID NOS. L-2017-LLA-0256 AND L-2017-LLA-0257)

Dear Mr. Capps:

By letter dated May 2, 2017, as supplemented by letters dated July 20 and November 21, 2017, (Agencywide Documents Access and Management System (ADAMS) Accession Nos.

ML17122A116, ML17201Q132, ML17325A588), Duke Energy Carolinas, LLC (Duke, the licensee) submitted license amendment requests {LARs) to revise Catawba Nuclear Station, Units 1 and 2 (Catawba) and McGuire Nuclear Station, Units 1 and 2 (McGuire) Technical Specification (TS), 3.8.1, "AC [Alternating Current] Sources - Operating," to extend the Completion Time (CT), of Condition B for an inoperable emergency diesel generator (DG), from 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> to 14 days. To support this request, a supplemental power source (i.e., two supplemental diesel generators (SDGs)) with the capability to power any emergency bus will be added to each station. Also part of the audit was to discuss another LAR dated September 14, 2017 (ADAMS Accession No ML17261B255) for Catawba to revise TS 3.7.8, "Nuclear Service Water System [NSWS]," by adding a new condition to allow Single Pond Return Header Operation of the NSWS with a 30-Day CT.

To support its review of the LAR, the U.S. Nuclear Regulatory Commission staff conducted a regulatory audit at Duke Energy Offices in Charlotte, North Carolina from May 8, 2018 to May 10, 2018 to verify information submitted by the licensee and the supporting information.

S. Capps If you have any questions, please contact me at 301-415-3867 or via e-mail at Michael.Mahoney@nrc.gov.

}7~/J Michael Mahoney, Pr Ject Manager Plant Licensing Branch 2-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-369, 50-370, 50-413 and 50-414

Enclosure:

Regulatory Audit Summary cc: Listserv

UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, O.C. 20555-0001 REGULATORY AUDIT

SUMMARY

FOR MAY 8- MAY 10, 2018, AUDIT IN SUPPORT OF THE REVIEW OF LICENSE AMENDMENT REQUESTS TO REVISE RISK-INFORMED EXTENDED COMPLETION TIMES DUKE ENERGY CAROLINAS, LLC CATAWBA NUCLEAR STATION, UNITS 1 AND 2 DOCKET NOS. 50-413 AND 50-414 MCGUIRE NUCLEAR STATION, UNITS 1 AND 2 DOCKET NOS. 50-369 AND 50-370

1.0 BACKGROUND

By letter dated May 2, 2017, as supplemented by letters dated July 20 and November 21, 2017, (Agencywide Documents Access and Management System (ADAMS) Accession Nos.

ML17122A116, ML172010132, ML17325A588), Duke Energy Carolinas, LLC (Duke, the licensee) submitted license amendment requests (LARs) to revise Catawba Nuclear Station, Units 1 and 2 (Catawba) and McGuire Nuclear Station, Units 1 and 2 (McGuire) Technical Specification (TS), 3.8.1, "AC [Alternating Current] Sources - Operating," to extend the Completion Time (CT), of Condition B for an inoperable emergency diesel generator (DG), from 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> to 14 days. To support this request, a supplemental power source (i.e., two supplemental diesel generators (SDGs)) with the capability to power any emergency bus will be added to the each station. Also part of the audit was to discuss another LAR dated September 14, 2017 (ADAMS Accession No ML172618255) for Catawba to revise TS 3.7.8, "Nuclear Service Water System [NSWS]," by adding a new condition to allow Single Pond Return Header Operation of the NSWS with a 30-Day CT.

The U.S. Nuclear Regulatory Commission (NRC) staff determined the need for a regulatory audit to be conducted in accordance with the Office of Nuclear Reactor Regulation (NRR) Office Instruction LIC-111, "Regulatory Audits" (ADAMS Accession No. ML082900195), for the NRC staff to gain a better understanding of the LARs. An audit plan was issued by the NRC staff by letter dated May 2, 2018 (ADAMS Accession No. ML18117A187). The NRC staff conducted the regulatory audit in accordance with the NRR Office Instruction LIC-111.

2.0 AUDIT DATES AND LOCATION The regulatory audit was held at the Duke Energy Offices in Charlotte, North Carolina. The audit was peformed from May 8 to May 10, 2018.

3.0 AUDIT TEAM MEMBERS U.S. Nuclear Regulatory Commission (NRC) Audit Team

• Leslie Fields, Audit Team Leader

• Todd Hilsmeier, Audit Technical Lead Pacific Northwest National Laboratory (PNNL) Team

• Garill Coles

• Mark Wilk Duke Energy Carolinas

• Michael Kitlan

• Robert Rishel

• Chet Sigmon

• Bryan Carroll

• Edmond Wiegert

• Ricardo Davis-Zapata

• Paul Farish

• Nicole Edwards

• Chris Nolan

• Robert Boyer

• Latonia Enos-Sylla

• Art Zaremba

• Jeff Ertman 4.0 DOCUMENTS AUDITED The following are the documents that were reviewed by NRC and Pacific Northwest National Laboratory staff during the audit:

• Catawba Facts and Observations (F&O) Closure Report Appendix I, Internal Events (non-large early release frequency, LERF) focused scope peer review for identified Upgrade

• Catawba F&O Closure Report Appendix H, Internal Events (non-LERF) F&O closures After Appendix X

• Catawba F&O Closure Report Appendix G, Internal Flood and LERF F&O Closures after Appendix X

• Catawba F&O Closure Report Appendix A, Internal Flood and LERF F&O Closures pre-Appendix X

• McGuire F&O Closure Report Appendix N, Internal Events (Non-LERF) after Appendix X

• McGuire early site permits human-error probability Development, Appendix M to MCC-1535.00-00-0208, Revision 0

• McGuire F&O Closure Summary Presentation

• Catawba F&O Closure Summary Presentation

• Human Reliability Analysis Assumptions Presentation

• Emergency diesel generator license amendment request probabilistic risk assessment (PRA) Assumptions and Conservatisms Presentation

• PRA Model Configuration Control Presentation

• Licensee draft responses to McGuire and Catawba audit questions 5.0 AUDIT

SUMMARY

Technical discussions focused on the following major review areas: (1) technical acceptability of the McGuire and Catawba internal events, high winds, and fire PRAs, (2) Catawba F&O closure report review, and (3) technical discussions of audit questions with the licensee's team.

In addition, NRC discussed non-PRA methods used for evaluating the risk from seismic events and other external hazards. During the audit, the NRC staff discussed questions associated with the license amendment request and identified new information that is needed in order for staff to reach a licensing decision.

6.0 EXIT BRIEFING At the conclusion of the audit, the team participated in a summary exit meeting with the Duke Energy audit team on May 10, 2018. The NRC staff provided a brief conclusion of the audit objectives that were met and details on the path forward. There were no open items needing further clarification and no deviation from the audit plan.

ML18249A046 *Memo Dated OFFICE NRR/D0RL/LPL2-1/PM NRR/D0RL/LPL2-1/LA NRR/D0RL/LPL2-1/BC NAME MMahoney KGoldstein MMarkley (RHall for)

DATE 9/14/18 09/14/18 9/20/18 OFFICE NRR/DRA/APLA/BC NRR/D0RL/LPL2-1/PM NAME SRosenburg MMahoney DATE 7/30/2018* 9/20/18