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Category:NRC Preliminary Notification of Event/Occurrence
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PRELIMINARY NOTIFICATION- REGION III October 31, 2007 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE - PNO-III-07-012A This preliminary notification constitutes EARLY notice of events of POSSIBLE safety or public interest significance. The information is as initially received without verification or evaluation, and is basically all that is known by the Region III staff on this date.
Facility Licensee Emergency Classification Byron Station Unit 1 and 2 Notification of Unusual Event Exelon Generation Company, LLC Alert Byron, Illinois Site Area Emergency Docket: 50-454/50-455 General Emergency License: NPF-37/NPF-66 x Not Applicable
SUBJECT:
UPDATE TO DUAL UNIT SHUTDOWN DESCRIPTION:
This preliminary notification supplements information in PNO-III-07-012, which documented the shutdown of the Byron Station Unit 1 and Unit 2 reactors on October 19, 2007, due to a leak in an essential service water pipe.
During the shutdown, the utility investigated the cause of the leak and made necessary repairs in the essential service water system to support start-up. Additional repairs are in progress.
Byron Unit 1 and Unit 2 restarted on October 30, 2007. Full power is expected to be achieved on or about November 2, 2007.
The NRC had dispatched a Special Inspection team to the plant to review the root causes of the problem, extent of condition, and corrective actions. The team continues the review of the issues associated with the essential service water system. Prior to the reactor restart, the team verified the adequacy of the licensees repairs to the essential service water system that had necessitated the shutdown.
This information is current as of 7:30 a.m. on October 31, 2007.
The information in this preliminary notification has been reviewed with licensee management.
Richard Skokowski Bruce Bartlett 630-829-9620 815-234-5451
