ML12208A338

Request for Voluntary Response to Petition

ML12208A338
Person / Time
Site:	Byron, Braidwood
Issue date:	08/02/2012
From:	Joel Wiebe Plant Licensing Branch III
To:	Pacilio M Exelon Nuclear
Joel Wiebe
References
TAC ME8462, TAC ME8463, TAC ME8464, TAC ME8465
Download: ML12208A338 (3)

Text

UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 August 2, 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:

REQUEST FOR VOLUNTARY RESPONSE TO PETITION FROM BARRY QUIGLEY REGARDING BYRON STATION, UNIT NOS. 1 AND 2, AND BRAIDWOOD STATION, UNITS 1 AND 2 HIGH-ENERGY LINE BREAK ANALYSIS (TAC NOS. ME8462. ME8463, ME8464, AND ME8465)

Dear Mr. Padlio:

Bye-mail dated April 20, 2012 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML12130A318), the U.S. Nuclear Regulatory Commission (NRC) received a Petition pursuant to Title 10 of the Code of Federal Regulations (10 CFR), Section 2.206, from Mr. Barry Quigley requesting that Byron Station, Unit Nos. 1 and 2, and Braidwood Station, Units 1 and 2, be immediately shutdown until all turbine building high-energy line break concerns are identified and those important to safety are corrected.

As Petition Manager, I would like to inform you that you have the right to submit a voluntary response to the issues identified in the Petition in accordance with NRC Management Directive 8.11, "Review Process for 10 CFR 2.206 Petitions" (ADAMS Accession No. ML041770328). If you choose to provide a voluntary response, the response will be made publicly available unless a request for withholding is submitted and granted in accordance with 10 CFR 2.390. Your response should include the items listed in the enclosure to this letter and will be used by the NRC to determine what, if any, additional action should be taken regarding the Petition. Your response should also be sent to Mr. Barry Quigley, the petitioner, for his information.

M. Pacilio

- 2 If you choose to respond, I am asking that you provide your response within 30 days of the date of this letter.

Sincerely,

~oel 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 Voluntary Response cc: Mr. Barry Quigley 3512 Louisiana Rd.

Rockford, IL 61108 cc w/encl: Distribution via Listserv

REQUEST FOR VOLUNTARY RESPONSE 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 The following information is requested to be included in your voluntary response:

a. Provide the current emergency diesel generator operability evaluation and prior revisions, including the consideration of the potential for combustion air intake to be diluted with steam. Include the basis documents referenced in the operability evaluations, including calculations and supporting analysis. If engineering judgment is relied on, provide the qualitative basis for this judgment if not clearly specified in the operability evaluation.

b. Provide the current engineered safety feature (ESF) switchgear room protective relay operability determination and prior revisions, including the consideration of high temperatures on setpoints. Include the basis documents referenced in the operability evaluations, including calculations and supporting analysis. If engineering judgment is relied on, provide the qualitative basis for this judgment if not clearly specified in the operability evaluation.

c. Provide the analysis of the Turbine Building high-energy line break (HELB) impact on the structural integrity of ESF switchgear room walls.

d. Provide a description of the methodology used for Turbine Building HELB analysis (i.e., "lumped volume," or "sub-divided volume" as available in the GOTHIC Code, or other methodology), including the basis for its use and if and when the NRC has approved such methodology for this application. Include a discussion of the code of record (Kitty6) and whether or not its use is appropriate.

e. Provide the plan and schedule for completing an assessment of the Turbine Building HELB issues, including an analysis of licensing basis and impact on equipment operability. Also include the following information:

1. The plan and schedule for extent of condition review of HELB areas other than the Turbine Building,

2. The plan and schedule for any decisions related to use of methodology such as when to use the GOTHIC or Kitty6 Code,

3. The plan for keeping up-to-date equipment operability evaluations for Braidwood and Byron, and Enclosure

-2

4. Whether Exelon has considered having an independent third-party review the plan scope, plan implementation, and resolution of assessment results.

If Exelon plans to have an independent third party review performed, include the plan and schedule for this review.

f.

Provide any other information that you believe would be helpful to the NRC in resolving the April 20, 2012, 10 CFR 2.206, petition.

ML12208A338 Sincerely, 1RAI Joel S. Wiebe, Senior Project Manager Plant Licensing Branch 111-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation RidsNrrDorlLpl3-2 Resource RidsNrrPMBraidwood Resource RidsRgn3MailCenter Resource RidsNrrDorlDpr Resource LA LPL3-2/BC NRR/DSS LPL3-2/PM NAME SRohrer MDudek JWiebe WRuland JWiebe DATE 8/1/12 8/01 112 8/01 112 8/02/12 8/02/12