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Event Notification Report for March 11, 2011

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Event Reports For
03/10/2011 - 03/11/2011

** EVENT NUMBERS **


46666 46667 46668

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Power Reactor Event Number: 46666
Facility: KEWAUNEE
Region: 3 State: WI
Unit: [1] [ ] [ ]
RX Type: [1] W-2-LP
NRC Notified By: SCOTT CIESLEWICZ
HQ OPS Officer: MARK ABRAMOVITZ
Notification Date: 03/10/2011
Notification Time: 18:29 [ET]
Event Date: 03/10/2011
Event Time: 15:49 [CST]
Last Update Date: 03/10/2011
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(iv)(A) - VALID SPECIF SYS ACTUATION
50.72(b)(3)(xiii) - LOSS COMM/ASMT/RESPONSE
Person (Organization):
BILLY DICKSON (R3DO)

Unit SCRAM Code RX CRIT Initial PWR Initial RX Mode Current PWR Current RX Mode
1 N N 0 Refueling Shutdown 0 Refueling Shutdown

Event Text

INADVERTANT OPENING A SUBSTATION BREAKER CAUSING LOSS OF STATION POWER

"At 1549 on 03/10/2011 with the plant shut down and the reactor defueled, power was lost to Safeguards 4160 Volt Bus 6. Diesel Generator B started and re-energized Bus 6.

"At the time of the event, Bus 6 was energized from the Main Auxiliary Transformer (MAT) on backfeed. The event was caused by opening of substation breaker TA2066 as the result of an error by technicians working In the substation.

"All equipment operated as expected for the voltage restoration to Safeguards Bus 6. Safeguards Bus 5 remained energized from offsite power through the Tertiary Auxiliary Transformer during the event.

"Spent Fuel Pool Cooling Train A remained In operation during the event. Spent Fuel Cooling Train B was restarted following restoration of power to Bus 6.

"The loss of the MAT also resulted in the loss of non-safeguards 4160 V Buses 1-4. In response to the loss of power to Bus 4, the Technical Support Center (TSC) / Station Blackout (SBO) Diesel started and failed to load onto 480 Volt Bus 46. This resulted in a loss of power to the Technical Support Center. The loss of power to the TSC is being reported as a loss of Emergency Assessment Capability. At 1632, the TSC/SBO Diesel Generator tripped due to the failure of the output breaker to close and provide power to its support equipment. The cause of the failure of the TSC/SBO output breaker to close is unknown at this time."

The licensee is investigating the cause of the breaker being opened and failure of the TSC/SBO diesel to load. One Spent Fuel Pool cooling train was in service throughout the event and no pool heatup occurred.

The licensee notified the NRC Resident Inspector.

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Power Reactor Event Number: 46667
Facility: NINE MILE POINT
Region: 1 State: NY
Unit: [1] [2] [ ]
RX Type: [1] GE-2,[2] GE-5
NRC Notified By: DAN COLEMAN
HQ OPS Officer: JOE O'HARA
Notification Date: 03/11/2011
Notification Time: 02:32 [ET]
Event Date: 03/10/2011
Event Time: 20:15 [EST]
Last Update Date: 03/11/2011
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(xiii) - LOSS COMM/ASMT/RESPONSE
Person (Organization):
SAM HANSELL (R1DO)

Unit SCRAM Code RX CRIT Initial PWR Initial RX Mode Current PWR Current RX Mode
1 N Y 91 Power Operation 91 Power Operation
2 N Y 100 Power Operation 100 Power Operation

Event Text

LOSS OF PRIMARY AND BACKUP METEROLOGICAL MONITORING EQUIPMENT ON BOTH TOWERS

"Loss of power to radiological monitoring equipment (primary and backup). This constitutes a major loss of emergency assessment capability per Nine Mile Point procedures. The cause of the loss of monitoring equipment is a downed 13.2 kV power line. Monitoring capability was restored at 0100."

The loss of power was caused by high winds, and the grid operator was able to restore power at 0100 EST.

The NRC Resident Inspector has been notified.

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Power Reactor Event Number: 46668
Facility: DIABLO CANYON
Region: 4 State: CA
Unit: [1] [2] [ ]
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: K.R.THOMPSON
HQ OPS Officer: JOE O'HARA
Notification Date: 03/11/2011
Notification Time: 04:40 [ET]
Event Date: 03/11/2011
Event Time: 01:23 [PST]
Last Update Date: 03/11/2011
Emergency Class: UNUSUAL EVENT
10 CFR Section:
50.72(a) (1) (i) - EMERGENCY DECLARED
Person (Organization):
THOMAS FARNHOLTZ (R4DO)
JANE MARSHALL (IRD)
ELMO COLLINS (RA)
JACK GROBE (NRR)

Unit SCRAM Code RX CRIT Initial PWR Initial RX Mode Current PWR Current RX Mode
1 N Y 100 Power Operation 100 Power Operation
2 N Y 100 Power Operation 100 Power Operation

Event Text

NOTICE OF UNUSUAL EVENT AS A RESULT OF A TSUNAMI WARNING IN THE AREA

The licensee declared a notice of unusual event as a result of a tsunami warning issued for the coastal areas of California. The tsunami warning is a result of a 8.9 magnitude earthquake off the coast of Japan. The licensee is in EAL HU1.5, 'Tsunami Affecting the Protected Area'. The NRC remains in the normal response mode.

The NRC Resident Inspector has been notified.

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Thursday, March 29, 2012