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Category:NRC Preliminary Notification of Event/Occurrence
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2015-03-10
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PRELIMINARY NOTIFICATION - REGION III March 10, 2015 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE - PNO-III-15-004 This preliminary notification constitutes EARLY notice of events of POSSIBLE safety or public interest significance. Some of the information may not yet be fully verified or evaluated by the Region III staff.
Facility Licensee Emergency Classification Byron Unit 1 Notification of Unusual Event Exelon Generation Company, LLC Alert Byron, Illinois Site Area Emergency Docket: 50-454 General Emergency License: NPF-37 X Not Applicable
SUBJECT:
BYRON UNIT 1 AUTOMATIC SHUTDOWN AFTER FALLING ICE CAUSED MAIN POWER TRANSFORMER SHORT CIRCUIT DESCRIPTION:
On March 3, 2015, at 11:01 a.m. CST Byron Unit 1 automatically shut down after a large piece of ice fell from an electrical conductor (bus bar) over one of the main power transformers resulting in a temporary short circuit condition. All safety systems responded as expected following the automatic shutdown and no complications occurred.
After replacing all damaged main power transformer components and following all required post-maintenance testing, Byron Unit 1 was restarted and synchronized to the electrical grid at 10:10 p.m. on March 9, 2015. The NRC resident inspectors assigned to Byron Station monitored portions of post-trip and startup activities.
Unit 2 was unaffected and continued to operate at 100 percent power throughout the event.
This preliminary notification is issued for information only and no further action by the staff is anticipated. There was no impact on public health and safety as a result of this event. Exelon issued a press release. State officials have been informed.
The information presented herein has been discussed with the licensee, and is current as of March 10, 12:30 p.m. CDT ADAMS Accession Number ML15069A489 CONTACT: Eric Duncan 630-829-9620 Eric.Duncan@nrc.gov
