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Did you hear about the DECLARED EMERGENCY in ILLINOIS? Or was it hushed?
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Original Message
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Just in case folks in Illinois didn't hear yet, there was an EMERGENCY DECLARED at one of your POWER REACTORS on Feb 28, 2012.
Power Reactor
Event Number: 47708
Facility: BYRON
Region: 3 State: IL
Unit: [1] [ ] [ ]
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: CHRIS COTE
HQ OPS Officer: CHARLES TEAL
Notification Date: 02/28/2012
Notification Time: 19:03 [ET]
Event Date: 02/28/2012
Event Time: 17:31 [CST]
Last Update Date: 02/29/2012
Emergency Class: UNUSUAL EVENT
10 CFR Section:
50.72(a) (1) (i) -
EMERGENCY DECLARED
UNUSUAL EVENT DUE TO LOSS OF OFFSITE POWER
Byron Unit 1 declared an Unusual Event due to a loss of offsite power for greater than 15 minutes (EAL MU-1). The 1A and 1B emergency diesel generators auto-started and automatically restored power to ESF (Engineered Safety Feature) Busses 141 and 142. The 1A Auxiliary Feedwater pump auto-started due to an undervoltage signal to ESF bus 141. The 6.9 KV Busses (Non-ESF) and 4.16 KV Busses (Non-ESF) auto transferred to the Unit Auxiliary Transformers and Unit 1 remained online. The ESF reserve feed breakers are available and in the process of transferring ESF loads over to Unit 2 via the ESF cross-ties. This will allow shutdown of the 1A and 1B diesel-generators and allow alignment to standby status. Switchyard repairs are being initiated.
The licensee notified the State of Illinois, Ogle County, Oregon and Byron municipalities and the NRC Resident Inspector. The licensee plans on issuing a news release. Unit 2 remained online and was unaffected throughout the event.
Notified Nuclear SSA and NICC vie email.
* * * UPDATE FROM CHRISTOPHER COTE TO CHARLES TEAL ON 2/29/12 AT 2222 EST * * *
"Termination of Unusual Event. Repairs to switchyard components are complete. Offsite power has been restored to Unit One System Auxiliary Transformers. Unit One 4 KV ESF busses have been re-energized from Unit One System Auxiliary Transformers and are no longer cross tied to Unit Two System Auxiliary Transformers. This restores the normal electrical lineup to the ESF busses. The entry conditions for MU-1 are no longer met."
The licensee has notified the NRC Resident Inspector, the State of Illinois, Ogle County, Oregon and Byron municipalities.
Notified R3DO (Stone), NRR EO (Lee), IRD (Morris), and other FEDS (DHS SWO, DHS NICC, FEMA, and NuclearSSA via email).
[link to www.nrc.gov]
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