Similar Documents at Byron |
|---|
Category:NRC Preliminary Notification of Event/Occurrence
MONTHYEARPNO-III-15-004, Byron Unit 1 Automatic Shutdown After Falling Ice Caused Main Power Transformer Short Circuit2015-03-10010 March 2015
PNO-III-15-004 - Byron Unit 1 Automatic Shutdown After Falling Ice Caused Main Power Transformer Short Circuit
PNO-III-12-003, Byron Station Unit 1 Unplanned Shutdown for Greater than 72 Hours2012-03-14014 March 2012
PNO-III-12-003 - Byron Station Unit 1 Unplanned Shutdown for Greater than 72 Hours
PNO-III-12-002, A, (Update) Byron Unit 1 Loss of Offsite Power and Declaration of a Notice of Unusual Event2012-03-0202 March 2012
PNO-III-12-002A, (Update) Byron Unit 1 Loss of Offsite Power and Declaration of a Notice of Unusual Event
ML12060A3862012-02-29029 February 2012
PNO-III-12-002 - Byron Unit 1 Loss of Offsite Power and Declaration of a Notice of Unusual Event
PNO-III-12-001, Byron Unit 2 Restarts After a Loss of Offsite Power and Declaring a Notice of Unusual Event2012-02-0707 February 2012
PNO-III-12-001, Byron Unit 2 Restarts After a Loss of Offsite Power and Declaring a Notice of Unusual Event
PNO-III-10-015, Byron, Initiation of Reactive Inspection in Response to a Failure of the Mechanism That Cools Water Surrounding a Canister Containing Spent Fuel2010-08-31031 August 2010
PNO-III-10-015: Byron, Initiation of Reactive Inspection in Response to a Failure of the Mechanism That Cools Water Surrounding a Canister Containing Spent Fuel
PNO-III-08-002, A - Byron, Unit 2, Update Notice of Unusual Event Due to Loss of Offsite Power to Vital Busses2008-03-28028 March 2008
PNO-III-08-002A - Byron, Unit 2, Update Notice of Unusual Event Due to Loss of Offsite Power to Vital Busses
ML0808602592008-03-26026 March 2008
PNO-III-08-002: Byron Unit 2 Notice of Unusual Event Due to Loss of Offsite Power to Vital Busses
PNO-III-07-014, Byron Unit 1, Nitrogen Leak During Maintenance2007-11-27027 November 2007
PNO-III-07-014: Byron Unit 1, Nitrogen Leak During Maintenance
PNO-III-07-012, A - NRC Inspection Team - Update to Dual Unit Shutdown2007-10-31031 October 2007
PNO-III-07-012A - NRC Inspection Team - Update to Dual Unit Shutdown
ML0729601092007-10-23023 October 2007
PNO-III-07-012 - Both Units at Byron Shut Down Due to a Lead in Pipe
PNO-III-06-004, B: Byron, Resumption of Effluent Discharges2006-04-20020 April 2006
PNO-III-06-004B: Byron, Resumption of Effluent Discharges
ML0609006692006-03-31031 March 2006
PNO-III-06-004A Tritium Leakage (Update)
PNO-III-06-006, Byron: Unusual Event Declared Due to a Fire within the Plant Protected Area2006-02-24024 February 2006
PNO-III-06-006, Byron: Unusual Event Declared Due to a Fire within the Plant Protected Area
ML0604602112006-02-15015 February 2006
PNO-III-06-004, Tritium Leakage
ML0535503512005-12-21021 December 2005
PNO-RIII-05-017- Byron Potential Gunshot Injury to a Site Employee
2015-03-10
[Table view] |
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 Byron Unit 1 Exelon Generation Company, LLC
Byron, Illinois Docket: 50-454 License: NPF-37 Licensee Emergency Classification Notification of Unusual Event Alert Site Area Emergency General Emergency 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
