ML23250A082

Regulatory Audit Summary Regarding LARs to Adopt TSTF-505, Rev. 2, and 10 CFR 50.69

ML23250A082
Person / Time
Site:	Nine Mile Point
Issue date:	09/19/2023
From:	Richard Guzman NRC/NRR/DORL/LPL1
To:	Rhoades D Constellation Energy Generation
References
EPID L-2022-LLA-0185, EPID L-2022-LLA-0186
Download: ML23250A082 (1)

Text

September 19, 2023 Mr. David P. Rhoades Senior Vice President Constellation Energy Generation, LLC President and Chief Nuclear Officer Constellation Nuclear 4300 Winfield Road Warrenville, IL 60555

SUBJECT:

NINE MILE POINT NUCLEAR STATION, UNIT 1 -

SUMMARY

OF REGULATORY AUDIT IN SUPPORT OF REVIEW OF LICENSE AMENDMENT REQUESTS REGARDING TSTF-505, REVISION 2, PROVIDE RISK-INFORMED EXTENDED COMPLETION TIMES - RITSTF INITIATIVE 4B AND TITLE 10 OF THE CODE OF FEDERAL REGULATIONS 50.69, RISK-INFORMED CATEGORIZATION AND TREATMENT OF STRUCTURES, SYSTEMS AND COMPONENTS FOR NUCLEAR POWER REACTORS (EPID L-2022-LLA-0185 AND EPID L-2022-LLA-0186)

Dear Mr. Rhoades:

By letters dated December 15, 2022 (Agencywide Documents Access and Management System (ADAMS) Accession Nos. ML22349A108 and ML22349A521), Constellation Energy Generation, LLC (Constellation) submitted two license amendment requests (LARs) for Nine Mile Point Nuclear Station, Unit 1. In its LARs, Constellation requested to amend license DPR-63 to adopt Technical Specifications Task Force (TSTF) Traveler 505 (TSTF-505), Provide Risk-informed Extended Completion Times, RITSTF Initiative 4b, and the provisions of Title 10 of the Code of Federal Regulations (10 CFR), Section 50.69, Risk-informed categorization and treatment of structures, systems and components for nuclear power reactors.

To support its review, the U.S. Nuclear Regulatory Commission (NRC) staff conducted a virtual regulatory audit from June 13, 2023, through June 14, 2023, to support its review of the license amendment requests. During the regulatory audit, the NRC staff reviewed documents and held discussions with members of Constellation and its representatives. The regulatory audit summary is enclosed with this letter.

D. Rhoades If you have any questions, please contact me by telephone at 301-415-1030 or by email to Richard.Guzman@nrc.gov.

Sincerely,

/RA/

Richard V. Guzman, Sr. Project Manager Plant Licensing Branch I Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-220

Enclosure:

Regulatory Audit Summary cc: Listserv

REGULATORY AUDIT

SUMMARY

REGARDING LICENSE AMENDMENT REQUESTS TO ADOPT RISK-INFORMED COMPLETION TIMES - TSTF-505, REVISION 2, AND 10 CFR 50.69 CONSTELLATION ENERGY GENERATION, LLC NINE MILE POINT NUCLEAR STATION, UNIT 1 DOCKET NO. 50-220

1.0 BACKGROUND

By letters dated December 15, 2022 (Agencywide Documents Access and Management System (ADAMS) Accession Nos. ML22349A108 and ML22349A521), Constellation Energy Generation, LLC (Constellation) submitted two license amendment requests (LARs) for Nine Mile Point Nuclear Station, Unit 1 (Nine Mile, Unit 1). In its LARs, Constellation requested to amend license DPR-63 to adopt Technical Specifications Task Force (TSTF) Traveler 505 (TSTF-505), Provide Risk-informed Extended Completion Times, RITSTF Initiative 4b, (ML18183A493) and the provisions of Title 10 of the Code of Federal Regulations (10 CFR), Section 50.69, Risk-informed categorization and treatment of structures, systems and components for nuclear power reactors.

Information that the U.S. Nuclear Regulatory Commission (NRC) staff relies upon to make the safety determination must be submitted on the docket. However, the NRC staff may review supporting information retained as records under 10 CFR 50.71 and/or 10 CFR 54.37, which, although not required to be submitted as part of the licensing action, would help the NRC staff better understand the licensees submitted information. To support its review of the LARs, the NRC staff issued a regulatory audit plan on January 31, 2023 (ML23025A386). The purpose of the audit is to review the documentation related to the subject of its applications (e.g.,

calculations and reports) that were not submitted on the Nine Mile, Unit 1, docket, to acquire additional understanding about the amendment requests, and to determine whether additional information is needed to be docketed to complete the NRC staffs safety evaluation.

2.0 AUDIT ACTIVITIES The NRC audit team consisted of NRC staff and NRC contract support from the Pacific Northwest National Laboratory (PNNL). Section 4.0 of this audit summary lists the individuals that took part in or attended the audit.

The NRC project manager discussed the audit plan with the licensee on January 31, 2023, and the virtual regulatory audit was conducted from February 1, 2023, through August 1, 2023.

Throughout the audit period, the NRC audit team would use an internet-based portal provided by the licensee to review primarily non-docketed information related to the application. On April 28, 2023, and May 22, 2023, the NRC staff submitted audit questions to the licensee (ML23118A388 and ML23142A022). Follow-up audit comments and questions were provided to the licensee on June 13, 2023 (ML23209A767), June 14, 2023 (ML23209A769), July 11, 2023 (ML23205A241 and ML23205A242), and July 19, 2023 (ML23205A243). A formal, virtual audit meeting with the licensee was held from June 13 - 14, 2023, to facilitate technical discussions of audit questions and disciplines according to the audit plan.

Enclosure

Technical discussions were focused on the following major areas: probabilistic risk assessment (PRA), external hazards, TSs, and electrical engineering. On August 1, 2023, the NRC staff provided a brief conclusion of the formal, virtual audit meeting including audit objectives that were met and details on the path forward. There were no open items from audit discussions and no deviations from the audit plan. Non-docketed information provided by the licensee in response to audit questions and the formal meeting is listed in section 5.0 of this audit summary. Constellation committed to issuing a supplement to the applications to provide documentation of certain audit discussion points on the docket.

3.0 RESULTS OF THE AUDIT The licensee supplemented its application on August 4, 2023 (ML23216A110). The NRC staff is reviewing the licensees supplement to assess if any additional information is needed to complete its review of the LARs.

4.0 AUDIT PARTICIPANTS NRC Constellation Richard Guzman Ronnie Reynolds Bob Pascarelli David Passehl Todd Hilsmeier Matthew Rossi Jigar Patel Philip Tarpinian Jeff Circle Chris Pupek Daniel Ju Chris Ault Stacey Rosenberg Jeffrey Stone De (Wesley) Wu Suzanne Loyd Jacob Davis Rachelle Johnson Stephen Wyman Robert Kirchner Vijay Goel Edward Parsley Hari Kodali Andrew Miller Ming Li Robert Michel Norbert Carte Leo Shanley Gurjendra Bedi Roy Linthicum Michael Benson Kristen Mast Stephen Cumblidge Donald Vanover Raul Hernandez Jeff Schappaugh David Nold Vince Andersen Syed Haider Konstantinos Belivanis Fred Forsaty Zachary Ballert Andrea Russell Joel Smithers Khadijah West Thomas Byrd Thomas Wengert Steve Short (Contractor from Pacific Northwest National Laboratory)

Mark Wilk (Contractor from Pacific Northwest National Laboratory) 5.0 LIST OF DOCUMENTS PROVIDED ON THE ELECTRONIC PORTAL The licensee provided an extensive list of supporting documents (e.g., analyses, calculations, reports, drawings, and procedures) on the Nine Mile, Unit 1, document portal available during

the audit period. Below lists the documents available on the portal that the NRC audit team reviewed during the audit.

Application Specific Documents

- Nine Mile, Unit 1, N1-MISC-020, Revision 0, RICT Estimates for TSTF-505 (RICT)

Program LAR Submittal, December 2020.

- Nine Mile, Unit 1, ER-AA-600-1052, Revision 1, Risk Management Support of RICT.

- Nine Mile, Unit 1, ER-AA-600-1053, Revision 0, Calculation of RMAT and RICT for Risk Informed Completion Time Program.

PRA Documents

- Nine Mile, Unit 1, 2008 PRA Peer Review Report, May 2008.

- Nine Mile, Unit 1, Fire PRA Peer Review Report Using ASME/ANS PRA Standard Requirements, January 2012.

- Nine Mile, Unit 1, Fire PRA Finding Level Fact and Observation Technical Review, Revision 1, April 2018.

- Nine Mile, Unit 1, PRA Finding Level Fact and Observation Independent Assessment, Revision 0, January 2022.

- Nine Mile, Unit 1, PRA Focused-Scope Peer Review, Revision 0, January 2022.

- Nine Mile, Unit 1, N1-PRA-013, Nine Mile Point, Unit 1, Probabilistic Risk Assessment Summary Document Notebook, Revision 1, 2021 PRA Update, May 2022.

- Nine Mile, Unit 1, N1-LAR-002, Nine Mile Point, Unit 1, PRA Gap Assessment Performed for the Internal Events / Internal Flooding PRA Models Between Regulatory Guide 1.200 Revisions 1 and 2, February 2023.

- Nine Mile, Unit 1, N1-MISC-019, Revision 0, Assessment of Key Assumptions and Sources of Uncertainty for the Nine Mile Point, Unit 1, Nuclear Station PRA, December 2022.

- Nine Mile, Unit 1, N1-PRA-005.25, Revision 0, FLEX and Portable Equipment System Notebook, May 2022.

- Nine Mile, Unit 1, N1-PRA-004, Revision 0, Human Reliability Analysis (HRA) Notebook, Volume 2, May 2022.

- Nine Mile, Unit 1, N1-PRA-004, Revision 3, Human Reliability Analysis (HRA) Notebook, Volume 1, May 2022.

- Nine Mile, Unit 1, N1-PRA-005.15, Revision 3, Condensate and Feedwater System Notebook.

- Nine Mile, Unit 1, N1-PRA-005.20, Revision 3, Fire Protection Water Injection System Notebook.

- Nine Mile, Unit 1, N1-PRA-014, Revision 2, Quantification Notebook 2021A Model.

- Nine Mile, Unit 1, N1-FQ-F001, Revision 7, Fire Quantification (FQ).

- Nine Mile, Unit 1, ER-AA-600-1015, Revision 20, FPIE PRA Model Update.

- Nine Mile, Unit 1, ER-AA-600-1061, Revision 7, Fire PRA Model Update and Control.

- Nine Mile, Unit 1, Human Reliability Analysis (HRA), Revision 0, December 2007.

- Nine Mile, Unit 1, Level 2 Probabilistic Risk Assessment (PRA), December 2007.

- Nine Mile, Unit 1, N1-ORA-015, Revision 2, Level 2 PRA Analysis, May 2022.

External Hazards

- Nine Mile, Unit 1, N1-MISC-015, Revision 0, External Hazards Assessment for Nine Mile Point Nuclear Station, Unit 1, December 2022.

- Nine Mile, Unit 1, S0FLOODF002, Nine Mile, Unit 1 Flood Water Ingress from Probable Maximum Flood, Revision 0.

- Nine Mile, Unit 1, N1-OP-19, Revision 2, Circulating Water System.

- Nine Mile, Unit 1, N1-OP-64, Revision 2, Meteorological Monitoring.

- Nine Mile, Unit 1, N1-SOP-18.1, Revision 6, Service Water Failure / Low Intake Level.

- Nine Mile, Unit 1, N1-SOP-19, Revision 5, Intake Structure Icing.

- Nine Mile, Unit 1, ECP-15-000703, Revision 0, High Wind Vulnerability Evaluation for Nine Mile Point, Unit 1, January 2016.

- Nine Mile, Unit 1, N1-MISC-021, High Winds and Tornado Missile Risk Assessment, Revision 0.

- EPRI 3002003107, High-Wind Risk Assessment Guidelines, Palo Alto, CA: 2015.

Plant Procedures

- Nine Mile, Unit 1, OP-AA-108-117, Revision 7, Protected Equipment Program.

- Nine Mile, Unit 1, OP-AA-108-118, Revision 2, Risk Informed Completion Time.

- Nine Mile, Unit 1, OP-AA-201-012-1001, Revision 5, Operations On-line Fire Risk Management.

- Nine Mile, Unit 1, OP-NM-201-012-1001, Revision 2, Operations On-line Fire Risk Management.

- Nine Mile, Unit 1, WC-AA-101-1006, Revision 4, On-line Risk Management and Assessment.

ML23250A082 OFFICE NRR/DORL/LPL1/PM NRR/DORL/LPL1/LA NRR/DRA/APLA/BC NRR/DRA/APLC/BC NAME RGuzman KEntz RPascarelli SVasavada DATE 9/7/2023 9/12/2023 9/07/2023 9/08/2023 OFFICE NRR/DEX/EEEB/BC NRR/DSS/STSB/BC(A) NRR/DORL/LPL1/BC NRR/DORL/LPL1/PM NAME WMorton JMahmoud HGonzález RGuzman DATE 9/12/2023 9/11/2023 9/18/2023 9/19/2023