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MONTHYEARRS-09-054, License Amendment Request Regarding Ultimate Heat Sink2009-06-30030 June 2009 License Amendment Request Regarding Ultimate Heat Sink Project stage: Request ML0921203572009-07-31031 July 2009 Application Accepted - Byron LAR for Ultimate Heat Sink (ME1669-70) Project stage: Other ML0932006512009-12-11011 December 2009 Request for Additional Information Related to License Amendment Regarding Ultimate Heat Sink Project stage: RAI RS-10-020, Additional Information Supporting Request for License Amendment Regarding Ultimate Heat Sink2010-01-25025 January 2010 Additional Information Supporting Request for License Amendment Regarding Ultimate Heat Sink Project stage: Request ML1013805252010-05-18018 May 2010 Additional RAI for Ultimate Heat Sink License Amendment Request (ME1669-70) Project stage: RAI RS-10-112, Additional Information Supporting Request for License Amendment Regarding Ultimate Heat Sink2010-07-0101 July 2010 Additional Information Supporting Request for License Amendment Regarding Ultimate Heat Sink Project stage: Request ML1021601902010-08-18018 August 2010 Request for Additional Information Related to License Amendment Regarding Ultimate Heak Sink Project stage: RAI ML1030602892010-11-0202 November 2010 Approved with Comment: Request to Extend the Submittal Date for the Byron UHS RAI Response Project stage: RAI RS-10-184, Additional Information Supporting Request for License Amendment Regarding Ultimate Heat Sink2010-11-0808 November 2010 Additional Information Supporting Request for License Amendment Regarding Ultimate Heat Sink Project stage: Request ML1035003172010-12-16016 December 2010 Draft NRC RAI Byron Station, Units 1 and 2 - LAR Ultimate Heat Sink Project stage: Draft RAI ML1036205592010-12-28028 December 2010 Request for Additional Information Related to License Amendment Regarding Ultimate Heat Sink Project stage: RAI RS-11-010, Response to Request for Additional Information Related to License Amendment Regarding Ultimate Heat Sink2011-01-31031 January 2011 Response to Request for Additional Information Related to License Amendment Regarding Ultimate Heat Sink Project stage: Response to RAI ML1103413522011-02-14014 February 2011 Request for Additional Information Related to License Amendment Regarding Ultimate Heat Sink Project stage: RAI ML1104505662011-02-15015 February 2011 3/01/2011 Notice of Forthcoming Meeting with Exelon to Discuss Nrc'S Staff'S Review of the Ultimate Head Sink License Amendment Request for the Byron Station, Units 1 and 2 Project stage: Meeting ML1106201482011-03-10010 March 2011 Summary of Meeting with Exelon Generation Company, LLC to Discuss the Request for Additional Information Related to License Amendment Regarding the Ultimate Heat Sink Project stage: RAI RS-11-035, Additional Information Supporting Request for License Amendment Regarding Ultimate Heat Sink2011-03-16016 March 2011 Additional Information Supporting Request for License Amendment Regarding Ultimate Heat Sink Project stage: Request RS-11-070, Supplement to Information Supporting Request for License Amendment Regarding Ultimate Heat Sink2011-05-0404 May 2011 Supplement to Information Supporting Request for License Amendment Regarding Ultimate Heat Sink Project stage: Supplement ML1113106332011-06-14014 June 2011 Issuance of Amendments Revision of Technical Specification 3.7.9, Ultimate Heat Sink Project stage: Approval 2010-05-18
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Category:Request for Additional Information (RAI)
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[Table view] Category:Letter
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UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 February 14, 2011 Mr. Michael J. Pacilio President and Chief Nuclear Officer Exelon Nuclear 4300 Winfield Road Warrenville. IL 60555 SUB~IECT: BYRON STATION, UNIT NOS. 1 AND 2 - REQUEST FOR ADDITIONAL INFORMATION RELATED TO LICENSE AMENDMENT REGARDING ULTIMATE HEAT SINK (TAC NOS. ME1669 AND ME1670)
Dear Mr. Pacilio:
By letter to the Nuclear Regulatory Commission (NRC) dated June 30, 2009, as supplemented by letters dated January 25, July 1. and November 11.2010 (Agencywide Documents Access and Management System (ADAMS) Accession Nos. ML091831253, ML100280553.
ML101830041 , and ML103120556, respectively). Exelon Generation Company, LLC (the licensee), submitted a license amendment request for the Byron Station, Unit Nos. 1 and 2, to revise Technical Specification 3.7.9, "Ultimate Heat Sink (UHS)," to add additional essential service water (SX) cooling tower fan requirements as a function of SX pump discharge temperature to reflect the results of a revised analysis for the UHS.
The NRC staff is reviewing your submittals, and has determined that additional information is required to complete its review. The specific information requested is addressed in the enclosure to this letter. During a discussion with your staff on February 9, 2011, it was agreed that you would provide a response within 30 days from the date of this letter.
Please note that if you do not respond to this letter by the agreed-upon date or provide an acceptable alternate date in writing, we may reject your request for approval under the provisions of 10 CFR 2.108.
The NRC staff considers that timely responses to requests for additional information help ensure that sufficient time is available for the NRC staff to review and contribute toward the NRC's goal of efficient and effective use of staff resources.
M. Pacilio -2 If circumstances result in the need to revise the requested response date, please contact me at 301-415-3867 or Nicholas DiFrancesco at 301-415-1115.
/
ichael Mahoney, Project Man~
Plant Licensing Branch 111-2 Division of Operating Reactor licensing Office of Nuclear Reactor Regulation Docket No. STN 50-454 and STN 50-455
Enclosure:
Request for Additional Information cc w/encl: Distribution via
REQUEST FOR ADDITIONAL INFORMATION BYRON STATION, UNIT NOS. 1 AND 2 EXELON GENERATION COMPANY, LLC DOCKET NOS. 50-454 AND 50-455 The Nuclear Regulatory Commission (NRC) staff is reviewing Exelon Generation Company, LLC's (the licensee) license amendment request (LAR) for the Byron Station, Unit Nos. 1 and 2 (Byron) dated June 30,2009, as supplemented by letters dated January 25, July 1, and November 11, 2010 (Agencywide Documents Access and Management System (ADAMS) Accession Nos. ML091831253, ML100280553, ML101830041, and ML103120556, respectively).
The LAR requests to revise Technical Specification (TS) 3.7.9, "Ultimate Heat Sink (UHS)," to add additional essential service water (SX) cooling tower fan requirements as a function of SX pump discharge temperature to reflect the results of a revised analysis for the UHS.
The NRC staff has determined that the following additional information is required to complete its review.
- 1. The UHS is required to be OPERABLE in MODES 1 through 4. Eight cooling tower fans running in fast speed are necessary to ensure basin temperature does not reach 100°F following a LOCA 1I0ss of offsite power at one unit concurrent with the safe shutdown from maximum power of the other unit under bounding conditions. When 8 fans are not OPERABLE and in fast speed while the plant is in MODES 1 through 4 under bounding conditions, LCO 3.7.9 is not met. As an alternative to shutting down the reactor, the TS allow entry into LCO 3.7.9 Condition A and performance of REQUIRED ACTIONS A.1 and A.2.
The Facility Operating License (FOL) for Byron contains a set of rules for the use and application of Byron TS's. The BACKGROUND section on Page 1.3-1 of Byron TS states "The ACTIONS associated with an LCO state Conditions that typically describe the ways in which the requirements of the LCO can fail to be met. Specified with each stated Condition are Required Action(s) and Completion Time(s)."
The proposed TS 3.7.9 changes do not appear to conform to the use and application section of Byron TS. That is, the proposed Conditions do not describe the ways in which cooling tower fan requirements can fail to be met.
Explain why this unusual format is required, or provide revised proposed TS that conform to the TS use and application section of the Byron FOL ENCLOSURE
M. Pacilio -2 If circumstances result in the need to revise the requested response date, please contact me at 301-415-3867 or Nicholas DiFrancesco at 301-415-1115.
Sincerely, IRAJ Michael Mahoney, Project Manager Plant Licensing Branch 111-2 Division of Operating Reactor licensing Office of Nuclear Reactor Regulation Docket No. STN 50-454 and STN 50-455
Enclosure:
Request for Additional Information cc w/encl: Distribution via Listserv DISTRIBUTION:
PUBLIC LPL3-2 RlF RidsNrrPMByron Resource RidsNrrLASRohrer Resource RidsOgcRp Resource RidsAcrsAcnw_MailCTR Resource RidsNrrDorlDpr Resource RidsRgn3MailCenter Resource NDiFrancesco, NRR RidsNrrDirsltsb Resource RidsNrrDssSnpb Resource ADAMS AcceSSion No. ML110341352 *Bsy Memo Dae t d OFFICE LPL3-2IPM LPL3-2/LA LPL3-2/BC DIRS/ITSB/BC LPL3-2/PM NAME MMahoney SRohrer RCarlson RElliott* MMahoney (EBrown for) 2/14/11 DATE 2/8/11 2/8/11 *2/4/11 2114/11 OFFICIAL RECORD COPY