RS-14-248, Interim Update Related to Earlier Response to Set 29 RAI B.2.1.5-1a, Related to the Braidwood Station, Units 1 and 2, and Byron Station, Units 1 and 2, License Renewal Application

Interim Update Related to Earlier Response to Set 29 RAI B.2.1.5-1a, Related to the Braidwood Station, Units 1 and 2, and Byron Station, Units 1 and 2, License Renewal Application

ML14247A210
Person / Time
Site:	Byron, Braidwood
Issue date:	09/04/2014
From:	Gallagher M Exelon Generation Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
RS-14-248
Download: ML14247A210 (2)

Text

Michael P. Gallagher Vice President. License Renewal Exelon Generation Exelon Nuclear 200 Exelon Way Kennett Square, PA 19348 610 765 5958 Office 610 765 5956 Fax www.exeloncorp.com michaelp.gallagher@exeloncorp.com 10 CFR 50 10 CFR 51 10 CFR 54 RS-14-248 September 4, 2014 U. S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, DC 20555-0001 Braidwood Station, Units 1 and 2 Facility Operating License Nos. NPF-72 and NPF-77 NRC Docket Nos. STN 50-456 and STN 50-457 Byron Station, Units 1 and 2 Facility Operating License Nos. NPF-37 and NPF-66 NRC Docket Nos. STN 50-454 and STN 50-455

Subject:

Interim Update Related to Earlier Response to Set 29 RAI B.2.1.5-1a, related to the Braidwood Station, Units 1 and 2, and Byron Station, Units 1 and 2, License Renewal Application

References:

1. Letter from Michael P. Gallagher, Exelon Generation Company LLC (Exelon) to NRC Document Control Desk, dated May 29, 2013, "Application for Renewed Operating Licenses"

2. Letter from Lindsay R. Robinson, US NRC to Michael P. Gallagher, Exelon, dated June 4, 2014, "Request for Additional Information for the Review of the Byron Station, Units 1 and 2, and Braidwood Station, Units 1 and 2, License Renewal Application, Set 29 (TAC NOS. MF1879, MF1880, MF1881, and MF1882)"

3. Letter from Michael P. Gallagher, Exelon, to NRC Document Control Desk, dated June 18, 2014, "Responses to NRC Requests for Additional Information, Set 29, dated June 4, 2014, related to the Byron Station, Units 1 and 2, and Braidwood Station, Units 1 and 2, License Renewal Application" In Reference 1, Exelon Generation Company, LLC (Exelon) submitted the License Renewal Application (LRA) for the Byron Station, Units 1 and 2, and Braidwood Station, Units 1 and 2 (BBS). In Reference 2, the NRC requested additional information to support staff review of the LRA. In Reference 3, Exelon responded to these RAls, including providing information related

September 4, 2014 U.S. Nuclear Regulatory Commission Page 2 to control rod drive mechanism (CROM) penetration (housing) nozzle wear under request for additional information (RAI) B.2.1.5-1 a.

As noted in the response to RAI B.2.1.5-1 a, Exelon plans to supplement that response with the results of the detailed analysis in November, 2014. This letter provides an interim update to the RAI B.2.1.5-1 a response.

Westinghouse Electric Company, the firm that is performing this analysis, has recently provided Exelon with confirmation that there is confidence that the final analysis will demonstrate ASME Code qualification for the CROM penetration nozzle with the maximum possible wear depth of 0.1075 inches, thus ensuring that this wear will not impact CROM penetration nozzle integrity at BBS. Consistent with earlier communications, the final detailed analysis is scheduled to be completed in October 2014, with the results to be provided to the NRC in November, 2014.

If the detailed analysis finds that the ASME Code acceptance criteria cannot be met for the maximum possible wear depth of 0.1075 inches, or if after completing their review the staff does not find the analysis acceptable, then Exelon will make a commitment to repair or replace the CROM penetration nozzles exhibiting indications of thermal sleeve centering pad wear.

There are no new or revised regulatory commitments contained in this letter.

If you have any questions, please contact Mr. Al Fulvio, Manager, Exelon License Renewal, at 610-765-5936.

I declare under penalty of perjury that the foregoing is true and correct.

Executed on 1-1 -/1 Respectfully, Vice President - License Renewal Projects Exelon Generation Company, LLC cc: Regional Administrator - NRC Region Ill NRC Project Manager (Safety Review), NRR-DLR NRC Project Manager (Environmental Review), NRR-DLR NRC Senior Resident Inspector, Braidwood Station NRC Senior Resident Inspector, Byron Station NRC Project Manager, NRR-DORL-Braidwood and Byron Stations Illinois Emergency Management Agency - Division of Nuclear Safety