Alert

Due to a lapse in appropriations, the NRC has ceased normal operations. However, excepted and exempted activities necessary to maintain critical health and safety functions—as well as essential progress on designated critical activities, including those specified in Executive Order 14300—will continue, consistent with the OMB-Approved NRC Lapse Plan.

Event Notification Report for March 11, 2011

U.S. Nuclear Regulatory Commission
Operations Center

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

** EVENT NUMBERS **

46666

46667

46668

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.

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.

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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