ML071140473

NRC Receipt of Response to GL 2003-01, Control Room Habitability

ML071140473
Person / Time
Site:	LaSalle
Issue date:	05/08/2007
From:	Sands S NRC/NRR/ADRO/DORL/LPLIII-2
To:	Crane C Exelon Generation Co
Sands S,NRR/DORL, 415-3154
References
GL-03-001, TAC MB9816, TAC MB9817
Download: ML071140473 (6)

Text

May 8, 2007 Mr. Christopher M. Crane President and Chief Nuclear Officer Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555

SUBJECT:

NRC RECEIPT OF LASALLE COUNTY STATION UNITS 1 AND 2, RESPONSES TO GENERIC LETTER 2003-01, CONTROL ROOM HABITABILITY (TAC NOS. MB9816 AND MB9817)

Dear Mr. Crane:

The Nuclear Regulatory Commission (NRC) acknowledges the receipt of your responses to Generic Letter (GL) 2003-01, Control Room Habitability dated December 9, 2003 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML033560302); September 30, 2004 (ADAMS Accession No. ML042740704); November 29, 2004 (ADAMS Accession No. ML043420211); July 11, 2005 (ADAMS Accession No. ML051920406), and November 29, 2006 (ADAMS Accession No. ML063340293) for the LaSalle County Station, Units 1 and 2. This letter provides a status of your responses and describes any actions that may be necessary 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 (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). 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 November 29, 2004, you reported the results of American Society for Testing Materials E741 Standard Test Method for Determining Air Change in a Single Zone by Means of a Tracer Gas Dilution tracer gas tests for the LaSalle, Units 1 and 2 control room which is common to both units and is pressurized for accident mitigation:

You determined that the tested value for filtered inleakage into the control room (CR) was 673 (+/-169) standard cubic feet per minute (scfm) which is less than the value of 1200 cubic feet per minute (cfm) assumed in your design basis radiological analysis.

You determined that the tested value for filtered inleakage into the Auxiliary Electric Equipment Room (AEER) was 940 (+/- 316) scfm which is less than the value of 1400

C. Crane cfm assumed in your design basis radiological analysis. You stated that there was no unfiltered inleakage since unfiltered inleakage only occurs downstream of the recirculation charcoal filter and all the ductwork and components downstream of the recirculation filter are pressurized or of leak tight construction.

In your letter dated November 29, 2006, you clarified that the assumed values for unfiltered inleakage as stated in your Updated Final Safety Analysis Report (UFSAR) are incorrect and that the values of 1200 cfm and 1400 cfm for filtered inleakage, and 7 cfm and 6 cfm for CR and AEER unfiltered inleakage as stated in your responses to GL 2003-01 are the correct values. You stated that this discrepancy has been entered into your corrective action program and will be resolved by revising the UFSAR to clarify the assumed unfiltered/filtered inleakage values.

You also provided information that adequately supported a conclusion that the most limiting unfiltered in leakage into the control room envelope (CRE) is incorporated into the hazardous chemical assessments, and that 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 (TSs) to determine if they 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 1c). As permitted by the GL 2003-01, you provided a schedule for revising the surveillance requirement in the TS to reference an acceptable surveillance methodology. In your July 11, 2005, response you indicated that you would evaluate your submittal with respect to the elements contained in TS Task Force Traveler No. 448 (TSTF-448) and resubmit a proposed license amendment request based on the evaluation within 90 days following NRC approval.

The information you provided also supported the fact that there are no compensatory measures in place to demonstrate control room habitability. The information you provided also supported the conclusion that Units 1 and 2 satisfy the intent of the GDC regarding control room habitability.

Your license amendment request (LAR) dated April 12, 2006 (ADAMS Accession No. ML071090282), based on TSTF-448, has been received and is acceptable for purposes of closing out your responses to GL 2003-01. The NRC staff will monitor the progress of the LAR and interact with you as necessary during the amendment process.

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

Sincerely,

/RA/

Stephen Sands, Project Manager Plant Licensing Branch III-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-373 & 50-374 cc: See next page

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

Sincerely,

/RA/

Stephen Sands, Project Manager Plant Licensing Branch III-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-373 & 50-374 cc: See next page Distribution:

PUBLIC LPL3-2 R/F RidsNrrDorlLpl3-2 RidsNrrLAEWhitt RidsNrrPMSSands RidsOgcRp RidsNrrDssScvb RidsNrrDprPgcb RidsAcrsAcnwMailCenter RidsNrrDorlDpr ADAMS Accession Number: ML071140473 NRR-106 OFFICE LPL3-2/PM LPL3-2/LA SCVB/BC PGCB/BC LPL3-2/BC NAME SSands:mw EWhitt RDennig CJackson RGibbs DATE 05/1/07 05/1/07 05/ 01 /07 05/ 03 /07 05/8/07 OFFICIAL RECORD COPY

LaSalle County Station, Units 1 and 2 cc:

Site Vice President - LaSalle County Station Robert Cushing, Chief, Public Utilities Division Exelon Generation Company, LLC Illinois Attorney General's Office 2601 North 21st Road 100 W. Randolph Street Marseilles, IL 61341-9757 Chicago, IL 60601 Plant Manager - LaSalle County Station Regional Administrator, Region III Exelon Generation Company, LLC U.S. Nuclear Regulatory Commission 2601 North 21st Road Suite 210 Marseilles, IL 61341-9757 2443 Warrenville Road Lisle, IL 60532-4352 Manager Regulatory Assurance - LaSalle Exelon Generation Company, LLC Illinois Emergency Management 2601 North 21st Road Agency Marseilles, IL 61341-9757 Division of Disaster Assistance &

Preparedness U.S. Nuclear Regulatory Commission 110 East Adams Street LaSalle Resident Inspectors Office Springfield, IL 62701-1109 2605 North 21st Road Marseilles, IL 61341-9756 Document Control Desk - Licensing Exelon Generation Company, LLC Phillip P. Steptoe, Esquire 4300 Winfield Road Sidley and Austin Warrenville, IL 60555 One First National Plaza Chicago, IL 60603 Senior Vice President - Operations Support Exelon Generation Company, LLC Assistant Attorney General 4300 Winfield Road 100 W. Randolph St. Suite 12 Warrenville, IL 60555 Chicago, IL 60601 Director - Licensing and Regulatory Affairs Chairman Exelon Generation Company, LLC LaSalle County Board 4300 Winfield Road 707 Etna Road Warrenville, IL 60555 Ottawa, IL 61350 Vice President - Regulatory Affairs Attorney General Exelon Generation Company, LLC 500 S. Second Street 4300 Winfield Road Springfield, IL 62701 Warrenville, IL 60555 Chairman Associate General Counsel Illinois Commerce Commission Exelon Generation Company, LLC 527 E. Capitol Avenue, Leland Building 4300 Winfield Road Springfield, IL 62706 Warrenville, IL 60555

LaSalle County Station, Units 1 and 2 cc:

Manager Licensing - Braidwood, Byron, and LaSalle Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555 Senior Vice President - Midwest Operations Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555