Event Notification Report for February 12, 2012
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
02/11/2012 - 02/12/2012
Power Reactor
Event Number: 48089
Facility: FORT CALHOUN
Region: 4 State: NE
Unit: [1] [] []
RX Type: (1) CE
NRC Notified By: ERICK MATZKE
HQ OPS Officer: DONG HWA PARK
Region: 4 State: NE
Unit: [1] [] []
RX Type: (1) CE
NRC Notified By: ERICK MATZKE
HQ OPS Officer: DONG HWA PARK
Notification Date: 07/11/2012
Notification Time: 10:14 [ET]
Event Date: 02/12/2012
Event Time: 14:54 [CDT]
Last Update Date: 07/11/2012
Notification Time: 10:14 [ET]
Event Date: 02/12/2012
Event Time: 14:54 [CDT]
Last Update Date: 07/11/2012
Emergency Class: NON EMERGENCY
10 CFR Section:
21.21(d)(3)(i) - DEFECTS AND NONCOMPLIANCE
10 CFR Section:
21.21(d)(3)(i) - DEFECTS AND NONCOMPLIANCE
Person (Organization):
ART BURRITT (R1DO)
ALAN BLAMEY (R2DO)
ERIC DUNCAN (R3DO)
MARK HAIRE (R4DO)
PART 21 GROUP
ART BURRITT (R1DO)
ALAN BLAMEY (R2DO)
ERIC DUNCAN (R3DO)
MARK HAIRE (R4DO)
PART 21 GROUP
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | N | N | 0 | Cold Shutdown | 0 | Cold Shutdown |
PART 21 - FAILED AUXILIARY CONTACTOR AFFECTING DIESEL GENERATOR
"On February 10, 2012, during the monthly testing of Diesel Generator 1 (DG-1), speed was raised from 500 RPM to 900 RPM. At approximately 750 RPM, the generator field did not 'flash', a term used to describe the normal voltage buildup in the field of a generator. Initial troubleshooting identified that the auxiliary contacts on the 2CR contactor did not close. This caused the field flash failure. The failure of the auxiliary contacts on the 2CR contactor prevented the diesel generator from performing its designed safety function. The specific part which fails to comply or contains a defect is General Electric CR105X300 auxiliary contactor. The auxiliary contactor was manufactured by General Electric Company and supplied by Nuclear Logistic, Incorporated, as an auxiliary part of a General Electric CR305 contactor.
"Further evaluation of the failure determined it to be reportable under 10CFR21 on June 8, 2012. The Corporate Officer was informed on June 13, 2012. The Regional Administrator was notified as required, but, due to an oversight, this report was not made to the Operations Center. The required 30 day report has been submitted (ML 121910230)."
The licensee has notified the NRC Resident Inspector.
"On February 10, 2012, during the monthly testing of Diesel Generator 1 (DG-1), speed was raised from 500 RPM to 900 RPM. At approximately 750 RPM, the generator field did not 'flash', a term used to describe the normal voltage buildup in the field of a generator. Initial troubleshooting identified that the auxiliary contacts on the 2CR contactor did not close. This caused the field flash failure. The failure of the auxiliary contacts on the 2CR contactor prevented the diesel generator from performing its designed safety function. The specific part which fails to comply or contains a defect is General Electric CR105X300 auxiliary contactor. The auxiliary contactor was manufactured by General Electric Company and supplied by Nuclear Logistic, Incorporated, as an auxiliary part of a General Electric CR305 contactor.
"Further evaluation of the failure determined it to be reportable under 10CFR21 on June 8, 2012. The Corporate Officer was informed on June 13, 2012. The Regional Administrator was notified as required, but, due to an oversight, this report was not made to the Operations Center. The required 30 day report has been submitted (ML 121910230)."
The licensee has notified the NRC Resident Inspector.
Power Reactor
Event Number: 47660
Facility: SEQUOYAH
Region: 2 State: TN
Unit: [1] [2] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: TIM REED
HQ OPS Officer: HOWIE CROUCH
Region: 2 State: TN
Unit: [1] [2] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: TIM REED
HQ OPS Officer: HOWIE CROUCH
Notification Date: 02/12/2012
Notification Time: 09:26 [ET]
Event Date: 02/12/2012
Event Time: 08:34 [EST]
Last Update Date: 02/12/2012
Notification Time: 09:26 [ET]
Event Date: 02/12/2012
Event Time: 08:34 [EST]
Last Update Date: 02/12/2012
Emergency Class: UNUSUAL EVENT
10 CFR Section:
50.72(a) (1) (i) - EMERGENCY DECLARED
10 CFR Section:
50.72(a) (1) (i) - EMERGENCY DECLARED
Person (Organization):
JOSELITO CALLE (R2DO)
VICTOR MCREE (R2RA)
BOB BOGER (NRR)
JASON KOZAL (IRD)
TAB BEACH (DHS)
JOSELITO CALLE (R2DO)
VICTOR MCREE (R2RA)
BOB BOGER (NRR)
JASON KOZAL (IRD)
TAB BEACH (DHS)
| 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 |
UNUSUAL EVENT DUE TO ELECTRICAL FAULT IN 161 KV SWITCHYARD
"At 0756 [EST] on 2/12/12, an electrical event occurred in the 161 kV switchyard that resulted in bus differential relay operating, and opening all PCBs [Protective Circuit Breakers] within 161 kV bus 2-2. Shortly after, a call was received from site security regarding an explosion in the switchyard.
"At 0820, a report was received that visible damage was present on an insulator between a PCB and a Motor Operated Disconnect (MOD) in the 161 kV switchyard, which is where the fault occurred. Follow up reports indicated an oil leak from a current transformer. Two other PCBs were identified to have visible damage. After the event, while opening MODS for PCBs that tripped open, the 'A' phase for one MOD did not open.
"No safety related equipment required to establish or maintain safe shutdown was affected. All the Diesel Generators remain in operable standby conditions.
"Unit 1 remained steady at 100% with no transients.
"Unit 2 had a 2B Condenser Circ Water pump trip off. Crew responded to the pump trip and Unit 2 remains at 100%.
"One offsite power source is inoperable and second offsite power source has been verified operable. Grid status is Yellow."
There were no personnel injuries reported due to the fault and resulting explosion. The loss of the offsite power source resulted in the licensee entering a 72-hr. LCO. The licensee is investigating both the cause of loss of offsite power and the circulating water pump trip.
The licensee has notified the State of Tennessee and the NRC Resident Inspector.
* * * UPDATE FROM KEVIN WILKES TO HOWIE CROUCH AT 1056 EST ON 2/12/12 * * *
At 1019 EST, the licensee terminated their Notification of Unusual Event. The basis for termination was that the fault was cleared and the conditions for EAL entry no longer exists.
The licensee has made state and local notifications and has notified the NRC Resident Inspector.
Notified R2DO (Calle), IRD (Kozal), NRR (Evans), DHS (Beach), FEMA (Fuller), and NICC (Berger)
"At 0756 [EST] on 2/12/12, an electrical event occurred in the 161 kV switchyard that resulted in bus differential relay operating, and opening all PCBs [Protective Circuit Breakers] within 161 kV bus 2-2. Shortly after, a call was received from site security regarding an explosion in the switchyard.
"At 0820, a report was received that visible damage was present on an insulator between a PCB and a Motor Operated Disconnect (MOD) in the 161 kV switchyard, which is where the fault occurred. Follow up reports indicated an oil leak from a current transformer. Two other PCBs were identified to have visible damage. After the event, while opening MODS for PCBs that tripped open, the 'A' phase for one MOD did not open.
"No safety related equipment required to establish or maintain safe shutdown was affected. All the Diesel Generators remain in operable standby conditions.
"Unit 1 remained steady at 100% with no transients.
"Unit 2 had a 2B Condenser Circ Water pump trip off. Crew responded to the pump trip and Unit 2 remains at 100%.
"One offsite power source is inoperable and second offsite power source has been verified operable. Grid status is Yellow."
There were no personnel injuries reported due to the fault and resulting explosion. The loss of the offsite power source resulted in the licensee entering a 72-hr. LCO. The licensee is investigating both the cause of loss of offsite power and the circulating water pump trip.
The licensee has notified the State of Tennessee and the NRC Resident Inspector.
* * * UPDATE FROM KEVIN WILKES TO HOWIE CROUCH AT 1056 EST ON 2/12/12 * * *
At 1019 EST, the licensee terminated their Notification of Unusual Event. The basis for termination was that the fault was cleared and the conditions for EAL entry no longer exists.
The licensee has made state and local notifications and has notified the NRC Resident Inspector.
Notified R2DO (Calle), IRD (Kozal), NRR (Evans), DHS (Beach), FEMA (Fuller), and NICC (Berger)