ML12233A601

Request for Additional Information, Measurement Uncertainty Recapture Power Uprate Request

ML12233A601
Person / Time
Site:	Byron, Braidwood
Issue date:	08/27/2012
From:	Michael Mahoney Plant Licensing Branch III
To:	Pacilio J Exelon Nuclear
Michael Mahoney
References
TAC ME6587, TAC ME6588, TAC ME6589, TAC ME6590
Download: ML12233A601 (3)

Text

UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 August 27, 2012 Mr. Michael J. Pacilio President and Chief Nuclear Officer Exelon Nuclear 4300 Winfield Road Warrenville, IL 60555

SUBJECT:

BYRON STATION, UNIT NOS. 1 AND 2, AND BRAIDWOOD STATION, UNITS 1 AND 2 - REQUEST FOR ADDITIONAL INFORMATION RE: MEASUREMENT UNCERTAINTY RECAPTURE POWER UPRATE REQUEST (TAC NOS. ME6587, ME6588, ME6589, AND ME6590)

Dear Mr. Pacilio:

By letter to the U.S. Nuclear Regulatory Commission (NRC) dated June 23, 2011, Exelon Generation Company, LLC submitted a request associated with a measurement uncertainty recapture power uprate for the Braidwood Station, Units 1 and 2, and Byron Station, Unit Nos. ~ '3nd 2.

The NRC staff has reviewed your submittal and has determined that additional information is required to complete the review. The specific information requested is addressed in the enclosure to this letter. During a discussion with your staff on August 15, 2012, it was agreed that you would provide a response within 30 days from the date of this letter.

The NRC staff considers that timely responses to requests for additional information help ensure sufficient time is available for staff review and contribute toward the NRC's goal of efficient and effective use of staff resources. If circumstances result in the need to revise the requested response date, please contact Mr. Joel Wiebe at (301) 415-6606.

ichael Mahoney, Pro ct Manager Plant Licensing Bran 111-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. STN 50-456, STN 50-457, STN 50-454 and STN 50-455

Enclosure:

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

REQUEST FOR ADDITIONAL INFORMATION (RAI)

BYRON STATION, UNIT NOS. 1 AND 2, AND BRAIDWOOD STATION, UNITS 1 AND 2 REGARDING MEASUREMENT UNCERTAINTY RECAPTURE POWER UPRATE LICENSE AMENDMENT REQUEST DOCKET NOS. STN 50-454, STN 50-455, STN 50-456 AND STN 50-457 TAC NOS. ME6587, ME6588, ME6589, ME6590 In reviewing the Exelon Generation Company, LLC (EGC) submittal dated June 23, 2011, related to a measurement uncertainty recapture (MUR) power uprate, for the Braidwood Station (Braidwood), Units 1 and 2, and Byron Station (Byron), Unit Nos. 1 and 2, the U.S. Nuclear Regulatory Commission (NRC) staff has determined that the following information is needed in order to complete its review:

EGC's supplemental submittal dated May 16, 2012, states:

The SFP [spent fuel pool] liner and racks were evaluated in the existing analyses of record for a design temperature of 200 OF [degrees Fahrenheit],

which bounds the peak MUR SFP temperature of 166.6 OF.

Page 9.1-29 of the Byron and Braidwood updated final safety analysis report (UFSAR) states:

The liner plate and anchorage system have been designed for the forces resulting from long-term shrinkage of concrete, and a temperature rise to 158 OF from the 70 OF ambient temperature with nominal cooling.

The design temperature for the liner (158 OF) in the UFSAR, and the temperature noted in the response to RAI-13 in your May 16, 2012 submittal (200 OF), do not appear to be consistent.

Please clarify the statement in EGC's May 16, 2012, submittal.

Enclosure

Mr. Michael J. Pacilio President and Chief Nuclear Officer Exelon Nuclear 4300 Winfield Road Warrenville, IL 60555

SUBJECT:

BYRON STATION, UNIT NOS. 1 AND 2, AND BRAIDWOOD STATION, UNITS 1 AND 2 - REQUEST FOR ADDITIONAL INFORMATION RE: MEASUREMENT UNCERTAINTY RECAPTURE POWER UPRATE REQUEST (TAC NOS. ME6587, ME6588, ME6589, AND ME6590)

Dear Mr. Pacilio:

By letter to the U.S. Nuclear Regulatory Commission (NRC) dated June 23, 2011, Exelon Generation Company, LLC submitted a request associated with a measurement uncertainty recapture power uprate for the Braidwood Station, Units 1 and 2, and Byron Station, Unit Nos. 1 and 2.

The NRC staff has reviewed your submittal and has determined that additional information is required to complete the review. The specific information requested is addressed in the enclosure to this letter. During a discussion with your staff on August 15, 2012, it was agreed that you would provide a response within 30 days from the date of this letter.

The NRC staff considers that timely responses to requests for additional information help ensure sufficient time is available for staff review and contribute toward the NRC's goal of efficient and effective use of staff resources. If circumstances result in the need to revise the requested response date, please contact Mr. Joel Wiebe at (301) 415-6606.

Sincerely, IRAI Michael Mahoney, Project Manager Plant Licensing Branch 111-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. SrN 50-456, STN 50-457, STN 50-454 and STN 50-455

Enclosure:

Request for Additional Information cc w/encl: Distribution via Listserv DISTRIBUTION PUBLIC LPL3-2 R/F RidsNrrDorlLpl3-2 Resource RidsNrrPMByron Resource RidsNrrPMBraidwood Resource RidsNrrLASRohrer Resource RidsOgcRp Resource RidsRgn3MailCenler Resource RidsNrrDorlDpr Resource RidsAcrsAcnw_MailCTR Resource ADAMS Accession No. ML12233A601 OFFICE LPL3-2/PM NAME MMahoney DATE 8127/12 LPL3-2ILA SRohrer 8/27/12 LPL3-2/PM MMahoney 8/27/12 OFFICIAL RECORD COpy