ML032731420
| ML032731420 | |
| Person / Time | |
|---|---|
| Site: | Byron, Braidwood  |
| Issue date: | 09/18/2003 |
| From: | Kuczynski S Exelon Nuclear |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| BYR 2003-0087 | |
| Download: ML032731420 (2) | |
Text
Exek lon.
Exelon Generation Company, LLC www.exeloncorp.com Nucer Byron Station NudeaT 4450 North German Church Road Byron, IL 61010-9794 September 18, 2003 LTR:
BYR 2003-0087 File:
2.01.700 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
Subject:
Update to Individual Plant Examination of External Events Submittal Reports
References:
(1) Letter from K. L. Graesser (Commonwealth Edison Company) to NRC, "Transmittal of Byron Station Individual Plant Examination of External Events Submittal Reports," dated December 23, 1996 (2)
Letter from H. Gene Stanley (Commonwealth Edison Company) to NRC, "Transmittal of Braidwood Station Individual Plant Examination of External Events Submittal Reports," dated June 27, 1997 (3)
Letter from Mahesh Chawla (NRC) to Oliver D. Kingsley, (Exelon Generation Company, LLC), 'Review of Braidwood Individual Plant Examination of External Events (IPEEE) Submittal," dated May 30, 2001 (4)
Letter from Mahesh Chawla (NRC) to Oliver D. Kingsley, (Exelon Generation Company, LLC), "Review of Individual Plant Examination of External Events - Byron Station, Units 1 and 2,"
dated May 30, 2001 In References 1 and 2, Byron and Braidwood Stations submitted a report to the NRC that provided a summary of the methodologies, results and conclusions of their AO
September 18, 2003 U.S. Nuclear Regulatory Commission Page 2 respective Individual Plant Examination of External Events (IPEEE). The seismic analysis section of these reports identified some plant improvements that were complete or scheduled to be completed. These plant improvements included a recommendation to evaluate and secure the main control room ceiling diffusers to the T-bar support system, as appropriate, in order to prevent the diffusers from falling during a seismic event and becoming a personnel hazard. The NRC, in References 3 and 4, reiterated this recommendation in the associated IPEEE safety evaluation for Byron Station and Braidwood Station.
Byron and Braidwood engineering have subsequently completed this evaluation and have demonstrated through calculations the main control room ceiling diffusers are capable of withstanding an IPEEE Review Level Earthquake and will not fall.
Consequently, the tying of the main control room ceiling diffusers to the T-bar support system is considered not necessary.
Should you have any questions concerning this letter, please contact William Grundmann, Regulatory Assurance Manager, at (815) 406-2800.
Respectfully, 5/F Stephen E. Kuczynski Site Vice President Byron Nuclear Generating Station cc:
Regional Administrator - NRC Region IlIl NRC Senior Resident Inspector - Byron Station NRC Senior Resident Inspector - Braidwood Station