ML12216A000

Request for Additional Information Related to Measurement Uncertainty Uprate

ML12216A000
Person / Time
Site:	Byron, Braidwood
Issue date:	09/27/2012
From:	Joel Wiebe Plant Licensing Branch III
To:	Pacilio M Exelon Generation Co
Joel Wiebe
References
TAC ME6587, TAC ME6588, TAC ME6589, TAC ME6590
Download: ML12216A000 (4)

Text

UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 September 27, 2012 Mr. Michael J. Pacilio Senior Vice President Exelon Generation Company, LLC President and Chief Nuclear Officer (CNO)

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 RELATED TO MEASUREMENT UNCERTAINTY UPRATE (TAC NOS. ME658, ME6588, ME6589, and ME6590)

Dear Mr. Pacilio:

By letter to the U.S. Nuclear Regulatory Commission (NRC) dated June 23,2011 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML111790026), Exelon Generation Company, LLC submitted a request for a license amendment for the Braidwood Station, Units 1 and 2, and Byron Station, Unit Nos. 1 and 2. The proposed amendment would revise the maximum power level specified in each unit's operating license and the technical specifications definition of rated thermal power.

The NRC staff is reviewing 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 September 20, 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

M. Pacilio

- 2 If circumstances result in the need to revise the requested response date, please contact me at (301) 415-6606.

Sincerely,

~qjj/P Joel S. Wiebe, Senior Project Manager Plant Licensing Branch 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 BYRON STATION, UNIT NOS. 1 AND 2, AND BRAIDWOOD STATION, UNITS 1 AND 2 DOCKET NOS. STN 50-454, STN 50-455, STN 50-456 AND STN 50-457 In reviewing the Exelon Generation Company's (Exelon's) submittal, related to measurement uncertainty recapture for the Braidwood Station, Units 1 and 2, and Byron Station, Unit Nos. 1 and 2, the U.S. Nuclear Regulatory Commission staff has determined that the following information is needed in order to complete its review:

1. During a May 31,2012, phone conference, Exelon identified a divergent trend between the Leading Edge Flow Meter (LEFM) and plant secondary systems parameters.

a. Provide a summary of the Byron Station, Unit 1, determination of cause of the LEFM versus secondary plant parameter drift that occurred from June to September 2011.

b. Provide the Cameron report on Byron Station, Unit 1, LEFM calibration that came out of the determination of the cause of the LEFM versus secondary plant parameter drift that occurred from June to September 2011.

c. Provide information to verify that this adverse trend did not result in operation above the licensed power level.

Enclosure

. ML 12216AOOO Sincerely, IRAI Joel S. Wiebe, Senior Project Manager Plant Licensing Branch 111-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation LPL3-2 R/F RidsAcrsAcnw_MailCTR Resource ResourceRidsNrrDorlDpr Resource RidsRgn3MailCenter OFFICE LPL3-2/PM LPL3-2/LA SRXB/BC LPL3-2/BC LPL3-2/PM NAME JWiebe SRohrer CJackson MDudek JWiebe DATE 08/23/12 09/24/12 09/14/12 09/25/12 09/27/12