ML20065M803

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Audit Report for Vogtle Electric Generating Plant Units 3 and 4 (LAR 19-009) Request for License Amendment and Exemption: Automatic Depressurization System (ADS) and Core Makeup Tank Cmt Design Parameters
ML20065M803
Person / Time
Site: Vogtle  Southern Nuclear icon.png
Issue date: 03/11/2020
From: Cayetano Santos
NRC/NRR/VPOB
To: Victor Hall
Office of Nuclear Reactor Regulation
Tanny Santos Ex 7270
References
LAR 19-009
Download: ML20065M803 (10)
v • d • e


Text

March 11, 2020 MEMORANDUM TO: Victor E. Hall, Chief Vogtle Project Office Office of Nuclear Reactor Regulation FROM: Cayetano Santos, Senior Project Manager /RA/

Vogtle Project Office Office of Nuclear Reactor Regulation

SUBJECT:

AUDIT REPORT FOR VOGTLE ELECTRIC GENERATING PLANT, UNITS 3 AND 4, REQUEST FOR LICENSE AMENDMENT AND EXEMPTION: AUTOMATIC DEPRESSURIZATION SYSTEM (ADS) AND CORE MAKEUP TANK (CMT) DESIGN PARAMETERS (LAR 19-009)

By letter dated September 30, 2019 (Agencywide Documents Access and Management System (ADAMS) Accession Number ML19273A953), as supplemented by letter dated December 19, 2019 (ADAMS Accession No. ML19353B752), Southern Nuclear Operating Company (SNC) requested an amendment to Combined License (COL) Numbers NPF-91 and NPF-92, for Vogtle Electric Generating Plant (VEGP) Units 3 and 4.

The proposed amendment revises the licensing basis documents to reflect revised automatic depressurization system (ADS) and core makeup tank (CMT) design parameters. The requested amendment requires a departure from the Updated Final Safety Analysis Report (UFSAR) Tier 2 information that involves a change to the plant-specific Tier 1 (and associated COL Appendix C) information in Table 2.1.2-4 identifying a) the maximum stroke times for the ADS Stages 1, 2, and 3 valves, and b) the minimum effective flow areas for the ADS Stages 2 and 3 valves. The requested amendment also requires a departure from the UFSAR Tier 2 information that involves a change to the COL Appendix A information in Technical Specification (TS) 3.5.2 and TS 3.5.3 identifying the required CMT minimum volume. Editorial changes are also provided for TS 3.5.3.

CONTACT: Cayetano Santos, NRR/VPO 301-415-7270

V. Hall The Nuclear Methods, Systems, and New Reactors Branch (DSS/SNRB) and PRA Licensing Branch C (DRA/APLC) staff conducted an audit on January 7, 2020 - February 5, 2020. The purpose of the audit was to review the documentation and calculations needed by the U.S.

Nuclear Regulatory Commission (NRC) staff to verify the information and conclusions in License Amendment Request 19-009.

Docket Nos.: 52-025 and 52-026

Enclosure:

Regulatory Audit Report cc: See next page

ML20065M803 *via e-mail NRO-008 OFFICE VPO/LA VPO/PM (c) DSS/SNRB/BC DRA/APLC/BC NAME RButler CSantos* RPatton* SRosenberg*

DATE 3/6/20 3/6/20 3/6/20 3/10/20 OFFICE VPO/BC VPO/PM (s)

NAME VHall* CSantos DATE 3/6/20 3/11/20 Vogtle Mailing List (Revised 2/13/2020) cc:

Resident Manager Resident Inspector Oglethorpe Power Corporation Vogtle Plant Units 3 & 4 Alvin W. Vogtle Nuclear Plant 8805 River Road 7821 River Road Waynesboro, GA 30830 Waynesboro, GA 30830 Mr. Barty Simonton Office of the Attorney General Team Leader 40 Capitol Square, SW Environmental Radiation Program Atlanta, GA 30334 Air Protection Branch Environmental Protection Division Southern Nuclear Operating Company 4244 International Parkway, Suite 120 Document Control Coordinator Atlanta, GA 30354-3906 3535 Colonnade Parkway Birmingham, AL 35243 Brian H. Whitley Regulatory Affairs Director Anne F. Appleby Southern Nuclear Operating Company Olgethorpe Power Corporation 3535 Colonnade Parkway, BIN N-226-EC 2100 East Exchange Place Birmingham, AL 35243 Tucker, GA 30084 Mr. Michael Yox County Commissioner Site Regulatory Affairs Director Office of the County Commissioner Vogtle Units 3 & 4 Burke County Commission 7825 River Road, Building 302 (ESB)

Waynesboro, GA 30830 Bin 6031 Waynesboro, GA 30830 Mr. Wayne Guilfoyle Commissioner District 8 Augusta-Richmond County Commission 4940 Windsor Spring Rd Hephzibah, GA 30815 Gwendolyn Jackson Burke County Library 130 Highway 24 South Waynesboro, GA 30830 Mr. Reece McAlister Executive Secretary Georgia Public Service Commission Atlanta, GA 30334 Page 1 of 3

Vogtle Mailing List Email aagibson@southernco.com (Amanda Gibson) acchambe@southernco.com (Amy Chamberlian) gam@nei.org (Gia Montserrat)

Lindsay@georgiawand.org (Lindsay Harper) bhwhitley@southernco.com (Brian Whitley)

Bill.Jacobs@gdsassociates.com (Bill Jacobs) corletmm@westinghouse.com (Michael M. Corletti) crpierce@southernco.com (C.R. Pierce) dahjones@southernco.com (David Jones) david.hinds@ge.com (David Hinds) david.lewis@pillsburylaw.com (David Lewis) dlfulton@southernco.com (Dale Fulton) ed.burns@earthlink.net (Ed Burns) edavis@pegasusgroup.us (Ed David)

G2NDRMDC@southernco.com (SNC Document Control)

George.Taylor@opc.com (George Taylor) harperzs@westinghouse.com (Zachary S. Harper) james1.beard@ge.com (James Beard)

JHaswell@southernco.com (Jeremiah Haswell) jim@ncwarn.org (Jim Warren)

John.Bozga@nrc.gov (John Bozga)

Joseph_Hegner@dom.com (Joseph Hegner) karlg@att.net (Karl Gross) kmstacy@southernco.com (Kara Stacy) kroberts@southernco.com (Kelli Roberts)

KSutton@morganlewis.com (Kathryn M. Sutton) kwaugh@impact-net.org (Kenneth O. Waugh) markus.popa@hq.doe.gov (Markus Popa) mdmeier@southernco.com (Mike Meier) media@nei.org (Scott Peterson)

Melissa.Smith@Hq.Doe.Gov (Melissa Smith) mike.price@opc.com (M.W. Price)

MKWASHIN@southernco.com (MKWashington) mphumphr@southernco.com (Mark Humphrey)

MSF@nei.org (Marvin Fertel) nirsnet@nirs.org (Michael Mariotte)

Nuclaw@mindspring.com (Robert Temple)

Paul@beyondnuclear.org (Paul Gunter) pbessette@morganlewis.com (Paul Bessette) ppsena@southernco.com (Peter Sena,III) r.joshi15@comcast.net (Ravi Joshi) rwink@ameren.com (Roger Wink) sabinski@suddenlink.net (Steve A. Bennett)

Michelle@cleanenergy.org (Michelle Powell)

Page 2 of 3

Vogtle Mailing List sblanton@balch.com (Stanford Blanton)

Shiva.Granmayeh@hq.doe.gov (Shiva Granmayeh) sjackson@meagpower.org (Steven Jackson) sjones@psc.state.ga.us (Shemetha Jones) skauffman@mpr.com (Storm Kauffman) slieghty@southernco.com (Steve Leighty) sroetger@psc.state.ga.us (Steve Roetger) syagee@southernco.com (Stephanie Agee)

TomClements329@cs.com (Tom Clements)

Vanessa.quinn@dhs.gov (Vanessa Quinn) wayne.marquino@gmail.com (Wayne Marquino) weave1dw@westinghouse.com (Doug Weaver)

William.Birge@hq.doe.gov (William Birge)

X2edgran@southernco.com (Eddie R. Grant) x2gabeck@southernco.com (Gary Becker)

X2hagge@southern.com (Neil Haggerty)

X2wwill@southernco.com (Daniel Williamson)

Page 3 of 3

REPORT OF REGULATORY AUDIT REQUEST FOR LICENSE AMENDMENT AND EXEMPTION:

AUTOMATIC DEPRESSURIZATION SYSTEM (ADS) AND CORE MAKEUP TANK (CMT)

DESIGN PARAMETERS (LAR 19-009)

VOGTLE ELECTRIC GENERATING PLANT, UNITS 3 AND 4 DOCKET NOS.52-025 AND 52-026 A. Background By letter dated September 30, 2019 (Reference 1), as supplemented by letter dated December 19, 2019 (Reference 2), Southern Nuclear Operating Company (SNC) requested an amendment to Combined License (COL) Numbers NPF-91 and NPF-92, for Vogtle Electric Generating Plant (VEGP) Units 3 and 4 (References 4 and 5).

License Amendment Request (LAR)19-009 requests revisions to the licensing basis documents to reflect revised automatic depressurization system (ADS) and core makeup tank (CMT) design parameters. The requested amendment requires a departure from the Updated Final Safety Analysis Report (UFSAR) Tier 2 information that involves a change to the plant-specific Tier 1 (and associated COL Appendix C) information in Table 2.1.2-4 identifying a) the maximum stroke times for the ADS Stages 1, 2, and 3 valves, and b) the minimum effective flow areas for the ADS Stages 2 and 3 valves. The requested amendment also requires a departure from the UFSAR Tier 2 information that involves a change to the COL Appendix A information in Technical Specification (TS) 3.5.2 and TS 3.5.3 identifying the required CMT minimum volume.

Editorial changes are also provided for TS 3.5.3.

The purpose of this audit is to review the documentation and calculations needed by the U.S.

Nuclear Regulatory Commission (NRC) staff to verify the information and conclusions in LAR 19-009.

B. Regulatory Audit Basis This regulatory audit is based on the following:

  • VEGP Units 3 and 4 Revision 8 to UFSAR, Revision 7 to Tier 1, Revision 51 to Technical Specifications Bases, June 14, 2019 (ADAMS Accession No. ML19171A093).

Enclosure

The audit plan is available in ADAMS under Accession No. ML19364A157 (Reference 3).

C. Logistics The audit was conducted from the NRC headquarters via the Westinghouse Electric Companys (Westinghouse) electronic reading room, and via telephone conferences with SNC and Westinghouse subject matter experts.

Dates: January 7, 2020 - February 5, 2020 Location: NRC Headquarters One White Flint North 11555 Rockville Pike Rockville, MD 20852-2738 D. Audit Team Members The following NRC staff members participated in the audit:

  • Alina Schiller, Project Manager E. Applicant and Industry Participants The following personnel from SNC and Westinghouse participated in the periodic telephone conferences:
  • Eddie Grant, SNC
  • Mark Humphrey, SNC
  • Brad Chamberlain, SNC
  • Neil Haggerty, SNC
  • Ann Marie DiLullo, Westinghouse F. Documents Audited APP-SSAR-GSC-765, Shutdown Evaluation for the AP1000 Plant: Loss of Normal Residual Heat Removal System (RNS) Cooling Analysis with NOTRUMP, Revision 2, December 27, 2017.

Markups to APP-SSAR-GSC-765, Revision 2, Appendix C: Analysis of Reduced CMT Volume, September 27, 2019.

G. Description of Audit Activities and Summary of Observations LAR 19-009, in part, proposes to delete the performance of existing technical specification (TS)

Surveillance Requirement (SR) 3.5.2.2 from TS SR 3.5.3.1, as well as proposes the addition of 2

a new TS SR. New TS SR 3.5.3.3 is created to verify the borated water volume in the CMT required to be OPERABLE when in MODE 5 with the Reactor Coolant System (RCS) not VENTED is greater than or equal to 2450 ft3. The results of a loss of Normal Residual Heat Removal System (RNS) analysis with a reduced CMT water volume from the safety analysis described in UFSAR Chapter 15 are not presented in UFSAR Chapter 19, Appendix E.

Therefore, the goal of the staffs audit was to review the loss of RNS analysis and verify it adequately supports the proposed changes to the minimum CMT water volume in TS 3.5.3.

The staff notes that the loss of RNS calculation note (APP-SSAR-GSC-765) addresses several different modes of operation. For example, it covers MODE 4 and MODE 5 with the RCS intact, MODE 5 with RCS vented, MODE 5 vacuum refill, and MODE 5 mid-loop operation. The staff verified that calculation incorporated updates for the design changes to ADS Stages 1, 2, and 3, as described above, as applicable. Furthermore, the staff reviewed the calculation methods, inputs, and assumptions.

In addition, the staff reviewed markups to APP-SSAR-GSC-765, Revision 2, titled Appendix C:

Analysis of Reduced CMT Volume. The purpose of this appendix is to generate additional NOTRUMP calculations for loss of RNS cooling events during shutdown conditions with a reduced CMT volume of 2450 ft3 as requested in the LAR. The results of the Appendix C calculation show that even with the new reduced volume, the in-service CMT maintains the core mixture level above the top of the active fuel for a loss of RNS cooling in shutdown MODES 4 and 5 with the RCS intact, thus satisfying the acceptance criteria.

The audit included two teleconference calls with the licensee. During the calls, the staff asked questions related to the methods and assumptions used in the loss of RNS calculation. The licensee adequately addressed all staff questions and clarifications where necessary.

H. Exit Briefing The staff conducted the audit exit briefing on February 25, 2020. The licensee and staff discussed the completion of the audit and plans for preparing a safety evaluation on LAR 19-009.

I. Requests for Additional Information (RAIs) Resulting from Audit No RAIs were issued as a result of this audit.

J. Open Items and Proposed Closure Paths No open items were identified as a result of the audit.

K. Deviations from Audit Plan The duration of the audit was extended in order to allow the staff to ask additional questions.

L. References

1. Southern Nuclear Operating Company, Vogtle Electric Generating Plant Units 3 and 4, Request for License Amendment and Exemption: Automatic Depressurization System (ADS) and Core Makeup Tank (CMT) Design Parameters (LAR 19-009), September 30, 2019 (ADAMS Accession No. ML19273A953).

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2. Southern Nuclear Operating Company, Vogtle Electric Generating Plant Units 3 and 4, Supplement to Request for License Amendment and Exemption: Automatic Depressurization System (ADS) and Core Makeup Tank (CMT) Design Parameters (LAR 19-009S1), December 19, 2019 (ADAMS Accession No. ML19353B752).
3. Audit plan for Vogtle Electric Generating Plant Units 3 and 4, Request for License Amendment and Exemption: Automatic Depressurization System (ADS) and Core Makeup Tank (CMT) Design Parameters (LAR 19-009), January 8, 2020 (ADAMS Accession No. ML19364A157).
4. Vogtle Electric Generating Plant Unit 3, Current Facility Combined License NPF-91, revised June 13, 2019 (ADAMS Accession No. ML14100A106).
5. Vogtle Electric Generating Plant Unit 4, Current Facility Combined License NPF-92, revised June 25, 2019 (ADAMS Accession No. ML14100A135).

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