ML062420273

Response to GL 2003-01 Control Room Habitability.

ML062420273
Person / Time
Site:	Clinton
Issue date:	10/19/2006
From:	Sands S Plant Licensing Branch III-2
To:	Crane C AmerGen Energy Co
Banerjee M, NRR/ADPT, 415-2277
References
GL-03-001, TAC MB9788
Download: ML062420273 (4)

Text

October 19, 2006Mr. Christopher M. CranePresident and Chief Executive Officer AmerGen Energy Company, LLC Clinton Power Station 4300 Winfield Road Warrenville, IL 60555

SUBJECT:

NRC RECEIPT OF CLINTON POWER STATION, UNIT 1 - RESPONSES TOGENERIC LETTER 2003-01, "CONTROL ROOM HABITABILITY" (TAC NO. MB9788)

Dear Mr. Crane:

The Nuclear Regulatory Commission (NRC) acknowledges the receipt of your responses toGeneric Letter (GL) 2003-01, "Control Room Habitability," dated August 11, 2003 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML032310390);

December 9, 2003 (ADAMS Accession No. ML033560302); March 19, 2004 (ADAMS Accession No. ML040890545); November 29, 2004 (ADAMS Accession No.

ML043420211); February 8, 2005 (ADAMS Accession No. ML050560210); and July 11, 2005 (ADAMS Accession No. ML051920406) for the Clinton Power Station, Unit 1 (Clinton). This letter provides a status of your responses and describes any actions that may be required to consider your responses to GL 2003-01 complete. The GL 2003-01 requested that you confirm that your control rooms meet their design bases(e.g., General Design Criterion (GDC) 1, 3, 4, 5, and 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; 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).

GL 2003-01 further requested information on any compensatory measures in use to demonstrate control room habitability, and plans to retire them (GL 2003-01, Item 2).By letter dated February 8, 2005, the results of American Society for Testing andMaterials E741, "Standard Test Method for Determining Air Change in a Single Zone by Means of a Tracers Gas Dilution," tracer gas tests for the Clinton control room were reported. The maximum measured tested value for filtered inleakage was reported as 310 +/- 157 square cubic feet per minute (scfm) which is less than the value of 650 cubic feet per minute (cfm) assumed in the existing design basis for filtered CRE inleakage. Also, the maximum measured tested value for unfiltered inleakage was reported as 0 scfm which is less than the value of 10 cfm assumed in the existing design basis for unfiltered control room enclosure (CRE) inleakage.

C. Crane-2-Based on your evaluation, toxic gas protection of the CRE is not a concern and no toxic gasdetectors are required for Clinton. Therefore, inleakage testing specifically for toxic gas is not required. Also based on your evaluation, the reactor control capability is maintained from either the control room or the alternate shutdown panel in the event of smoke.GL 2003-01 further requested that you assess your technical specifications (TS) to determine ifthey verify the integrity of the CRE, including ongoing verification of the inleakage assumed in the design-basis analysis for control room habitability, and in light of the demonstrated inadequacy of a delta () P measurement to alone provide such verification (GL 2003-01,Item 1.c). In your July 11, 2005, response you withdrew your previous license amendment request (LAR)for administrative controls and indicated that you would evaluate your submittal with respect tothe elements contained in Technical Specification Task Force Traveler No. 448 (TSTF-448),

"Control Room Habitability," and resubmit a proposed LAR based on that evaluation. As permitted by GL 2003-01, you provided a schedule for revising the surveillance requirement in the TS to reference an acceptable surveillance methodology. Your schedule for resubmitting the LAR is within 90 days of NRC approval of TSTF-448. The information you provided supported the conclusion that the unit is required to meet theGDC regarding control room habitability. Additionally, the information provided supported the fact that no compensatory measures are in place to demonstrate control room habitability.Your commitment to submit a proposed LAR based on TSTF-448, following our formal reviewand approval, is acceptable for purposes of closing out your responses to GL 2003-01. The NRC staff will monitor submission of the proposed LAR and interact with you as necessary during the amendment process.If you have any questions regarding this correspondence, please contact me at (301) 415-3154.Sincerely,/RA/Stephen P. Sands, Project ManagerPlant Licensing Branch III-2 Division of Operation Reactor Licensing Office of Nuclear Reactor RegulationDocket No. 50-461 cc: See next page

ML062420273 *w/commentNRR-106OFFICELPL3-2/PMLPL3-/LA*SCVB/BC*PGCB/BC*LPL3-2/BCNAMESSands:mwDClarkeRDennigCJacksonDCollinsDATE10/19/200610/18/2006 10/2/200610/6/200610/19/2006 Clinton Power Station, Unit 1 cc:

Senior Vice President - Operations SupportExelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555Illinois Emergency Management Agency Division of Disaster Assistance &

Preparedness 110 East Adams Street Springfield, IL 62701-1109Director - Licensing and Regulatory AffairsAmerGen Energy Company, LLC 4300 Winfield Road Warrenville, IL 60555Manager Licensing - Quad CitiesExelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555Manager Regulatory Assurance - ClintonAmerGen Energy Company, LLC Clinton Power Station RR3, Box 228 Clinton, IL 61727-9351Vice President - Regulatory & Legal AffairsAmerGen Energy Company, LLC 4300 Winfield Road Warrenville, IL 60555Document Control Desk - LicensingAmerGen Energy Company, LLC 4300 Winfield Road Warrenville, IL 60555Site Vice President - Clinton Power StationAmerGen Energy Company, LLC Clinton Power Station RR 3, Box 228 Clinton, IL 61727-9351Plant Manager - Clinton Power StationAmerGen Energy Company, LLC Clinton Power Station RR 3, Box 228 Clinton, IL 61727-9351Senior Vice President - Midwest OperationsExelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555Resident InspectorU.S. Nuclear Regulatory Commission RR #3, Box 229A Clinton, IL 61727Regional Administrator, Region IIIU.S. Nuclear Regulatory Commission Suite 210 2443 Warrenville Road Lisle, IL 60532-4351Assistant General CounselExelon Generation Company, LLC 200 Exelon Way Kennett Square, PA 19348Chairman of DeWitt Countyc/o County Clerk's Office DeWitt County Courthouse Clinton, IL 61727J. W. BlattnerProject Manager Sargent & Lundy Engineers 55 East Monroe Street Chicago, IL 60603