RS-13-267, Supplemental Information Supporting Request for License Amendment Regarding Measurement Uncertainty Recapture Power Uprate

Supplemental Information Supporting Request for License Amendment Regarding Measurement Uncertainty Recapture Power Uprate

ML13318A232
Person / Time
Site:	Byron, Braidwood
Issue date:	11/13/2013
From:	Gullott D Exelon Generation Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
RS-13-267, TAC ME6587, TAC ME6588, TAC ME6589, TAC ME6590
Download: ML13318A232 (2)

Text

ti November 13, 2013 U. S. Nuclear Regulatory Commission ATTN: 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 10 CFR 50.90

Subject:

Supplemental Information Supporting Request for License Amendment Regarding Measurement Uncertainty Recapture Power Uprate

References:

1. Letter from Craig Lambert (Exelon Generation Company, LLC) to U. S. NRC, "Request for License Amendment Regarding Measurement Uncertainty Recapture Power Uprate," dated June 23, 2011

2. Letter from Nicholas J. DiFrancesco (U. S. NRC) to M. J. Pacilio (Exelon Generation Company, LLC), "Braidwood Station, Units 1 and 2, and Byron Station, Units Nos. 1 and 2 - Acceptance Review of License Amendment Request (LAR) Re: Measurement Uncertainty Recapture (MUR) Power Uprate (TAC Nos. ME6587, ME6588, ME6589, and ME6590)," dated September 19, 2011

3. Letter from David M. Gullott (Exelon Generation Company, LLC) to

u. S. NRC, "Response to a 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," dated August 31,2012 In Reference 1, Exelon Generation Company, LLC (EGG) requested an amendment to Facility Operating License Nos. NPF-72, NPF-77, NPF-37 and NPF*66 for Braidwood Station, Units 1 and 2, and Byron Station, Units 1 and 2, respectively. Specifically, the proposed changes revise the Operating License and Technical Specifications to implement an increase in rated thermal power of approximately 1.63% based on increased feedwater flow measurement accuracy.

In Reference 2, the NRC staff indicated that the satisfactory disposition of the known nonconformance with turbine building (TB) high-energy line break (HELB) would be required prior to implementation. Additionally on July 17, 2013 the NRC conducted an

November 13, 2013 U.S. Nuclear Regulatory Commission Page 2 Audit regarding the new TB HELB analysis and planned TB HELB modifications that were in the process of being installed to support that analysis.

The purpose of this letter is to confirm that the physical modifications to resolve the non-conformances and restore the design basis for the TB H ELB have been completed at both Braidwood and Byron Stations. The existing Operability Evaluations pertaining to the TB H ELB non-conformance have been closed at both Braidwood and Byron Stations. These closed Operability Evaluations, provided to the NRC in Reference 3, are listed below.

Braidwood Operability Evaluation 11-006: Turbine Building EHLB Analysis Input Errors Operability Evaluation 12-004: HELB Load Not Considered in Structural Calculation Operability Evaluation 11-005: Turbine Building HELB Analysis Input Errors Operability Evaluation 12-005: HELB Load Not Considered in Structural Calculation Subsequent to submittal of Reference 3, Byron Station initiated an additional Operability Evaluation,13-002, Unit 1 Emergency Diesel Generator Rolling Steel Door Supports, which was related to the TB HELB analysis. This Operability Evaluation has also been closed.

There are no regulatory commitments contained in this letter.

Should you have any questions concerning this letter, please contact Leslie E. Holden at (630) 657-3316.

I declare under penalty of perjury that the foregoing is true and correct. Executed on the 13th day of November 2013.

Respectfully, David M. Gullott Manager - Licensing Exelon Generation Company, LLC cc:

NRC Regional Administrator, Region III NRC Senior Resident Inspector, Braidwood Station NRC Senior Resident Inspector, Byron Station