ML15261A051

Request for Additional Information Regarding License Basis Changes in Steam Generator Tube Rupture Analysis

ML15261A051
Person / Time
Site:	Summer
Issue date:	09/22/2015
From:	Shawn Williams Plant Licensing Branch II
To:	Gatlin T South Carolina Electric & Gas Co
Williams S
References
TAC MF4699
Download: ML15261A051 (3)

Text

UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 Sept.ember 22, 2015 Mr. Thomas D. Gatlin Vice President, Nuclear Operations South Carolina Electric & Gas Company Virgil C. Summer Nuclear Station Post Office Box 88, Mail Code 800 Jenkinsville, SC 29065

SUBJECT:

VIRGIL C. SUMMER NUCLEAR STATION, UNIT NO. 1 - REQUEST FOR ADDITIONAL INFORMATION REGARDING LICENSE BASIS CHANGES IN STEAM GENERATOR TUBE RUPTURE ANALYSIS (TAC NO. MF4699)

Dear Mr. Gatlin:

By letter dated August 27, 2014, as supplemented on October 31, 2014, February 12, May 12, and September 10, 2015, the South Carolina Electric & Gas Company (SCE&G, the licensee) submitted a license amendment request (LAR) to revise Facility Operating License No. NPF-12 for the Virgil C. Summer Nuclear Station, Unit No. 1. SCE&G is proposing to revise the licensing basis to incorporate a supplemental analysis to the steam generator tube rupture accident.

The NRC staff has determined that additional information is needed to continue the review as discussed in the Enclosure. We request that SCE&G respond to these RAls within 45 days of the date of this letter. Please note that the NRC staff's review is continuing and further requests for information may be developed.

Sincerely, Shawn Williams, Senior Project Manager Plant Licensing Branch 11-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-395

Enclosure:

Request for Additional Information cc w/encl: Distribution via Listserv

REQUEST FOR ADDITIONAL INFORMATION LICENSE AMENDMENT REQUEST LICENSE BASIS CHANGES IN STEAM GENERATOR TUBE RUPTURE ANALYSIS VIRGIL C. SUMMER NUCLEAR STATION. UNIT NO. 1 DOCKET NO. 50-395 The U.S. Nuclear Regulatory Commission (NRC) staff reviewed the Virgil C. Summer Nuclear Station (VCSNS) License Amendment Request (LAR), dated August 27, 2014 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML14245A408) and supplements dated October 31, 2014 (ADAMS Accession No. ML14308A075), February 12, 2015 (ADAMS Accession No. ML15055A143), May 12, 2015 (ADAMS Accession No. ML15135A238), and September 10, 2015 (ADAMS Accession No. ML15258A021). The proposed LAR would incorporate supplemental analyses of a steam generator tube rupture accident which explicitly models operator responses and quantifies their impact on the potential for steam generator overfill and offsite and control room doses. The licensee stated that the new transient calculations supplement the VCSNS licensing basis analysis by demonstrating margin to steam generator overfill and providing input to a dose analysis that confirms the licensing basis mass transfer input is conservative.

The NRC staff has determined that the following request for additional information (RAI) is required to complete the review.

ARCB-RAl-1 In letter dated September 10, 2015, the licensee stated that the updated meteorological data was used to derive atmospheric dispersion values at the exclusion area boundary (EAB) and low population zone (LPZ) at certain time intervals using the PAVAN code and included a table of the updated atmospheric dispersion values for the EAB and LPZ.

However, the letter did not (1) provide atmospheric dispersion values at the control room that reflect the updated meteorological data, and (2) address the impact of the new updated atmospheric dispersion values on the steam generator tube rupture (SGTR) radiological consequence analysis dose rate results.

Therefore, in order for the NRC staff to assess that the license amendment meets 10 CFR 50.67 and General Design Criteria 19, please provide the atmospheric dispersion values at the control room which reflect the updated meteorological data and provide an evaluation that addresses the impact of the new updated atmospheric dispersion values (EAB, LPZ and control room) on the SGTR radiological consequence analysis dose rate results.

Enclosure

September 22, 2015 Mr. Thomas D. Gatlin Vice President, Nuclear Operations South Carolina Electric & Gas Company Virgil C. Summer Nuclear Station Post Office Box 88, Mail Code 800 Jenkinsville, SC 29065

SUBJECT:

VIRGIL C. SUMMER NUCLEAR STATION, UNIT NO. 1 - REQUEST FOR ADDITIONAL INFORMATION REGARDING LICENSE BASIS CHANGES IN STEAM GENERATOR TUBE RUPTURE ANALYSIS (TAC NO. MF4699)

Dear Mr. Gatlin:

By letter dated August 27, 2014, as supplemented on October 31, 2014, February 12, May 12, and September 10, 2015, the South Carolina Electric & Gas Company (SCE&G, the licensee) submitted a license amendment request (LAR) to revise Facility Operating License No. NPF-12 for the Virgil C. Summer Nuclear Station, Unit No. 1. SCE&G is proposing to revise the licensing basis to incorporate a supplemental analysis to the steam generator tube rupture accident.

The NRC staff has determined that additional information is needed to continue the review as discussed in the Enclosure. We request that SCE&G respond to these RAls within 45 days of the date of this letter. Please note that the NRC staff's review is continuing and further requests for information may be developed.

Sincerely, IRA/

Shawn Williams, Senior Project Manager Plant Licensing Branch 11-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-395

Enclosure:

Request for Additional Information cc w/encl: Distribution via Listserv DISTRIBUTION PUBLIC LPL2-1 R/F RidsAcrsAcnw_MailCTR Resource RidsNrrDorlDpr Resource RidsNrrDorllpl2-1 Resource RidsRgn2MailCenter Resource RidsNrrLASFigueroa Resource RidsNrrDRA Resource RidsNrrPMSummer Resource UShoop, NRR JWhite, NRO KErwin, NRO KBucholtz, NRR ADAMS Accession No.: ML15261A051 *by email OFFICE LPL2-1/PM LPL2-1/LA NRR/DRA/ARCB/BC LPL2-1/BC LPL2-1/PM NAME SWilliams SFiciueroa US hoop* RPascarelli SWilliams DATE 9/21/15 9/21/15 09/17/15 9/21/15 9/22/15 OFFICIAL RECORD COPY