ML062760555

NRC Receipt of Response to Generic Letter 2003-01, Control Room Habitability (Tac No. MB9860)

ML062760555
Person / Time
Site:	Summer
Issue date:	10/24/2006
From:	Martin R NRC/NRR/ADRO/DORL/LPLII-1
To:	Archie J South Carolina Electric & Gas Co
Martin R, NRR/DORL, 415-1493
References
GL-03-001, TAC MB9860
Download: ML062760555 (4)

Text

October 24, 2006 Mr. Jeffrey Archie Vice President, Nuclear Operations South Carolina Electric & Gas Company Virgil C. Summer Nuclear Station Post Office Box 88 Jenkinsville, S.C. 29065

SUBJECT:

VIRGIL C. SUMMER NUCLEAR STATION NRC RECEIPT OF RESPONSE TO GENERIC LETTER 2003-01 "CONTROL ROOM HABITABILITY" (TAC NO. MB9860)

Dear Mr. Archie:

The Nuclear Regulatory Commission (NRC) acknowledges the receipt of your responses to Generic Letter 2003-01 Control Room Habitability, dated August 8, 2003 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML032240028);

January 31, 2005 (ADAMS Accession No. ML050340205) and November 18, 2005 (ADAMS Accession No. ML053260454). This letter provides a status of your response and describes any additional information that may be necessary to consider your response to GL 2003-01 complete.

The GL requested that you confirm that your control rooms meet their design bases (e.g. General Design Criterion (GDC) 1, 3, 4, 5, & 19, draft GDC, or principal design criteria),

with special attention to: (1) determination of the most limiting unfiltered and/or filtered inleakage into the control room and comparison to values used in your design bases for meeting control room operator dose limits from accidents (GL 2003-01, Item 1a); (2) determination that the most limiting unfiltered inleakage is incorporated into your hazardous chemical assessments (GL 2003-01, Item 1b); and, (3) determination that reactor control capability is maintained in the control room or at the alternate shutdown location in the event of smoke (GL 2003-01, Item 1b). The GL further requested information on any compensatory measures in use to demonstrate control room habitability (CRH), and plans to retire them (GL 2003-01, Item 2).

You reported the results of ASTM E741[American Society for Testing Materials, Standard Test Method for Determining Air Change in a Single Zone by Means of a Tracer Gas Dilution] tracer gas tests for the pressurized Virgil C. Summer Nuclear Station control room.

You determined that the tested value for unfiltered inleakage into the control room envelope (CRE) was 41 standard cubic feet per minute (scfm), which is less than the value of 55 scfm assumed in the design basis radiological dose analyses for CRH.

You indicated that your current design basis hazardous chemical assessment assumes 55 scfm inleakage and has inherent margin to accommodate potential increases in CRE inleakage; therefore, the most limiting unfiltered inleakage into your CRE (41 scfm) is incorporated into

J. Archie your assessment. You also indicated that reactor control capability is maintained from either the control room or the alternate Control Room Evacuation Panel rooms in the event of smoke.

The GL further requested that you assess your Technical Specifications (TS) to determine if they verify the integrity of the CRE, including ongoing verification of the inleakage assumed in the design basis analysis for CRH and in light of the demonstrated inadequacy of a differential pressure measurement alone to provide such verification (GL 2003-01, Item 1c). As permitted by the GL, you provided a schedule for revising the surveillance requirement in the TS to reference an acceptable surveillance methodology. In your November 18, 2005 response, you committed to submit a license request based on Technical Specification Task Force (TSTF)-448 within 12 months following the NRC approval of TSTF-448.

The information you provided also supported the fact that there are no compensatory measures needed to be in place to demonstrate CRH. The information you provided also supported the conclusion that your are committed to meet the GDC regarding CRH.

Your commitment to submit a license amendment request (LAR) based on TSTF-448, following our formal review and approval, is acceptable for purposes of closing out your response to GL 2003-01. The staff will monitor submission of the LAR and interact with you as necessary during the amendment process.

If you have any questions regarding this correspondence, please contact me.

Sincerely,

/RA/

Robert E. Martin, Senior Project Manager Plant Licensing Branch II-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-395 cc: See next page

ML062760555 NRR-088 OFFICE LPL2-1/PM LPL2-1/LA LPL2-1/BC NAME RMartin CSola EMarinos DATE 10/18/06 10/23/06 10/24/06 Mr. Jeffrey B. Archie VIRGIL C. SUMMER NUCLEAR STATION South Carolina Electric & Gas Company cc:

Mr. R. J. White Nuclear Coordinator S.C. Public Service Authority c/o Virgil C. Summer Nuclear Station Post Office Box 88, Mail Code 802 Jenkinsville, South Carolina 29065 Resident Inspector/Summer NPS c/o U.S. Nuclear Regulatory Commission 576 Stairway Road Jenkinsville, South Carolina 29065 Chairman, Fairfield County Council Drawer 60 Winnsboro, South Carolina 29180 Mr. Henry Porter, Assistant Director Division of Waste Management Bureau of Land & Waste Management Dept. of Health & Environmental Control 2600 Bull Street Columbia, South Carolina 29201 Mr. Thomas D. Gatlin, General Manager Nuclear Plant Operations South Carolina Electric & Gas Company Virgil C. Summer Nuclear Station Post Office Box 88, Mail Code 300 Jenkinsville, South Carolina 29065 Mr. Ronald B. Clary, Manager Nuclear Licensing South Carolina Electric & Gas Company Virgil C. Summer Nuclear Station Post Office Box 88, Mail Code 830 Jenkinsville, South Carolina 29065 Ms. Kathryn M. Sutton, Esquire Winston & Strawn Law Firm 1400 L Street, NW Washington, DC 20005-3502