ML20063H206

Audit Plan for LAR 20-001 Auxiliary Building Wall 11 Seismic Gap Requirements

ML20063H206
Person / Time
Site:	Vogtle
Issue date:	03/20/2020
From:	Cayetano Santos NRC/NRR/VPOB
To:	Victor Hall Office of Nuclear Reactor Regulation
Tanny Santos Ex 7270
References
LAR 20-001
Download: ML20063H206 (5)

Text

March 20, 2020 MEMORANDUM TO: Victor Hall, Chief Vogtle Project Office Office of Nuclear Reactor Regulation FROM: Cayetano Santos Jr., Project Manager /RA/

Vogtle Project Office Office of Nuclear Reactor Regulation

SUBJECT:

AUDIT PLAN FOR VOGTLE ELECTRIC GENERATING PLANT UNIT 3, REQUEST FOR LICENSE AMENDMENT AND EXEMPTION: UNIT 3 AUXILIARY BUILDING WALL 11 SEISMIC GAP REQUIREMENTS (LAR 20-001)

By letter dated February 7, 2020 (Agencywide Documents Access and Management System (ADAMS) Accession Number ML20038A939), Southern Nuclear Operating Company (the licensee) requested an amendment to Combined License (COL) Numbers NPF-91, for Vogtle Electric Generating Plant (VEGP) Unit 3.

The requested amendment proposes changes to COL Appendix C (and plant-specific Tier 1) and corresponding Tier 2* and Tier 2 information in the Updated Final Safety Analyses Report (UFSAR). Specifically, the request proposes to modify the north-south minimum seismic gap requirements above grade between the nuclear island and the annex building west of Column Line I from elevation 141 feet through 154 feet to accommodate as-built localized nonconformances.

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

V. Hall The Structural, Civil, Geotech, Engineering Branch (ESEA) plans to conduct an audit to gain a better understanding of the proposed changes and to review related documentation and non-docketed information in order to evaluate the acceptability of the proposed changes to the license.

Docket Nos.: 52-025

Enclosure:

Regulatory Audit Plan cc: See next page

ML20063H206 NRR-106 OFFICE NRR/VPO/PM NRR/VPO/LA NRR/DEX/ESEA/BC NRR/VPO/BC NAME CSantos RButler DWilliams VHall DATE 3/20/2020 3/19/2020 3/2/2020 3/29/2020 AUDIT OF REPORTS AND CALCULATIONS IN SUPPORT OF REQUEST FOR LICENSE AMENDMENT RELATED TO UNIT 3 AUXILIARY BUILDING WALL 11 SEISMIC GAP REQUIREMENTS (LAR-20-001)

SOUTHERN NUCLEAR OPERATING COMPANY VOGTLE ELECTRIC GENERATING PLANT, UNIT 3 Docket No.52-025 The purpose of the 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 the Request for License Amendment: Unit 3 Auxiliary Building Wall 11 Seismic Gap Requirements (LAR-20-001), submitted by Southern Nuclear Operating Company (SNC) for the Vogtle Electric Generating Plant (VEGP), Unit 3 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML20038A939).

A. BACKGROUND:

In LAR 20-001, SNC requests changes to Combined License (COL) Appendix C (and plant-specific Tier 1) and corresponding Tier 2* and Tier 2 information in the Updated Final Safety Analyses Report (UFSAR). Specifically, the request proposes to modify the north-south minimum seismic gap requirements above grade between the nuclear island and the annex building west of Column Line I from elevation 141 feet through 154 feet to accommodate as-built localized nonconformances.

B. REGULATORY AUDIT BASIS This regulatory audit is based on the following:

• VEGP Units 3 and 4 UFSAR Tier 1, Revision 7, June 14, 2019 (ADAMS Accession No. ML19171A045).

• VEGP Units 3 and 4 UFSAR Tier 2, Revision 8, June 14, 2019 (ADAMS Accession No. ML19171A096).

C. REGULATORY AUDIT SCOPE AND METHODOLOGY The audit team will view the documentation and calculations that provide the technical support for LAR 20-001. Information to be reviewed includes:

1) original analysis and prediction of the total and differential settlements for each structure;

2) settlement measurements of each structure along with the trend analysis of the total and differential settlement with time, especially when substantial loads were added at different construction stages; and

3) construction sequence including time lag of construction among these structures.

Enclosure

In addition, the audit team will request to discuss these topics with subject matter expert(s).

D. INFORMATION AND OTHER MATERIAL NECESSARY FOR THE REGULATORY AUDIT The staff requests that the documents, data, and calculations regarding the aforementioned topics be made available to the staff in the electronic reading room.

The staff acknowledges and will observe appropriate handling and protection of proprietary information made available for the audit.

E. AUDIT TEAM The following are the NRC audit team members:

• Pravin Patel, Structural Engineer, Lead

• Amitava Ghosh, Geotechnical Engineer

• Cayetano Santos Jr., Project Manager The licensee contact is Yasmeen Arafeh.

F. LOGISTICS Date: March 5, 2020 - March 27, 2020 Location: The audit will be conducted remotely using the licensees electronic reading room and teleconferences. As needed, face-to-face discussions and some document review may occur at:

Westinghouse Electric Company, LLC Washington Operations 11333 Woodglen Drive, Suite 203 Rockville, Maryland 20852 Telephone: 301-881-7040/7042 G. SPECIAL REQUESTS None Cayetano Santos Jr., NRC Project Manager, can be reached at 301-415-7270 or Cayetano.Santos@nrc.gov.

H. DELIVERABLES On completion of the audit, the staff will prepare an audit summary report that will be declared and entered as an official agency record in ADAMS. The audit outcome may be used to identify any additional information to be submitted for making regulatory decisions and will assist the staff in the issuance of requests for additional information (if necessary) in completing its review of LAR 20-001.

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