Event Notification Report for January 30, 2012
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
01/29/2012 - 01/30/2012
Power Reactor
Event Number: 47626
Facility: NORTH ANNA
Region: 2 State: VA
Unit: [1] [2] []
RX Type: [1] W-3-LP,[2] W-3-LP
NRC Notified By: ROGER SMUTHERS
HQ OPS Officer: JOHN KNOKE
Region: 2 State: VA
Unit: [1] [2] []
RX Type: [1] W-3-LP,[2] W-3-LP
NRC Notified By: ROGER SMUTHERS
HQ OPS Officer: JOHN KNOKE
Notification Date: 01/30/2012
Notification Time: 19:15 [ET]
Event Date: 01/30/2012
Event Time: 18:56 [EST]
Last Update Date: 01/30/2012
Notification Time: 19:15 [ET]
Event Date: 01/30/2012
Event Time: 18:56 [EST]
Last Update Date: 01/30/2012
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):
BRIAN BONSER (R2DO)
VICTOR MCCREE (RA)
ERIC LEEDS (ET)
JEFF GRANT (IRD)
BRUCE BOGER (NRR)
BRIAN BONSER (R2DO)
VICTOR MCCREE (RA)
ERIC LEEDS (ET)
JEFF GRANT (IRD)
BRUCE BOGER (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 |
UNUSUAL EVENT DECLARED DUE TO AN EARTHQUAKE OF MAGNITUDE 3.2
At 1856 EST, North Anna, Units 1 and 2, experienced an onsite seismic event. This was confirmed by the National Earthquake Information Center to be a magnitude 3.2. Based on these 2 indications the licensee declared an Unusual Event per EAL HU 1.1. The earthquake did not impact operations or equipment, and both units remain at 100% power. To exit the Unusual Event the licensee will need to verify that no damage was sustained to any systems or equipment. Presently the licensee is conducting a walkdown to verify no damage was incurred.
The licensee has notified the NRC Resident Inspector. The licensee also notified the state and other government agencies.
* * * UPDATE AT 0048 EST ON 1/31/12 FROM ROGER SMUTHERS TO PETE SNYDER * * *
"The NOUE declared at 1856 EST on 1/30/12 has been terminated [at 0035 EST]. The event has been terminated after completion of AP-36, which is the procedure used when seismic activity is experienced. The abnormal procedure included engineering and operations inspections of various systems throughout the station, all of which were completed satisfactorily with no damage found relating to the seismic event."
"None of the stations seismic instrumentation actuated during the event due to low seismic activity felt at the station. The newly installed Free Field Seismic Instrumentation did not actuate which has a trigger point of 0.01 g's further demonstrating the low level of the seismic activity experienced at the station."
The licensee notified the NRC Resident Inspector. Notified R2DO (Bonser), NRR (Lund), IRD (Grant), DHS (Gates), and FEMA (Biscoe).
At 1856 EST, North Anna, Units 1 and 2, experienced an onsite seismic event. This was confirmed by the National Earthquake Information Center to be a magnitude 3.2. Based on these 2 indications the licensee declared an Unusual Event per EAL HU 1.1. The earthquake did not impact operations or equipment, and both units remain at 100% power. To exit the Unusual Event the licensee will need to verify that no damage was sustained to any systems or equipment. Presently the licensee is conducting a walkdown to verify no damage was incurred.
The licensee has notified the NRC Resident Inspector. The licensee also notified the state and other government agencies.
* * * UPDATE AT 0048 EST ON 1/31/12 FROM ROGER SMUTHERS TO PETE SNYDER * * *
"The NOUE declared at 1856 EST on 1/30/12 has been terminated [at 0035 EST]. The event has been terminated after completion of AP-36, which is the procedure used when seismic activity is experienced. The abnormal procedure included engineering and operations inspections of various systems throughout the station, all of which were completed satisfactorily with no damage found relating to the seismic event."
"None of the stations seismic instrumentation actuated during the event due to low seismic activity felt at the station. The newly installed Free Field Seismic Instrumentation did not actuate which has a trigger point of 0.01 g's further demonstrating the low level of the seismic activity experienced at the station."
The licensee notified the NRC Resident Inspector. Notified R2DO (Bonser), NRR (Lund), IRD (Grant), DHS (Gates), and FEMA (Biscoe).
Power Reactor
Event Number: 47624
Facility: BYRON
Region: 3 State: IL
Unit: [] [2] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: LEO WEHNER
HQ OPS Officer: JOHN KNOKE
Region: 3 State: IL
Unit: [] [2] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: LEO WEHNER
HQ OPS Officer: JOHN KNOKE
Notification Date: 01/30/2012
Notification Time: 11:39 [ET]
Event Date: 01/30/2012
Event Time: 10:01 [CST]
Last Update Date: 01/31/2012
Notification Time: 11:39 [ET]
Event Date: 01/30/2012
Event Time: 10:01 [CST]
Last Update Date: 01/31/2012
Emergency Class: UNUSUAL EVENT
10 CFR Section:
50.72(a) (1) (i) - EMERGENCY DECLARED 50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL 50.72(b)(2)(i) - PLANT S/D REQD BY TS 50.72(b)(3)(iv)(A) - VALID SPECIF SYS ACTUATION
10 CFR Section:
50.72(a) (1) (i) - EMERGENCY DECLARED 50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL 50.72(b)(2)(i) - PLANT S/D REQD BY TS 50.72(b)(3)(iv)(A) - VALID SPECIF SYS ACTUATION
Person (Organization):
JAMNES CAMERON (R3DO)
CYNTHIA PEDERSON (R3)
BRUCE BOGER (ET)
JEFFERY GRANT (IRD)
SIL MOUVONE (DOE)
JAMNES CAMERON (R3DO)
CYNTHIA PEDERSON (R3)
BRUCE BOGER (ET)
JEFFERY GRANT (IRD)
SIL MOUVONE (DOE)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 2 | A/R | Y | 100 | Power Operation | 0 | Hot Standby |
UNUSUAL EVENT DUE TO LOSS OF OFFSITE POWER GREATER THAN 15 MINUTES
At 1101 EST, Byron Unit-2 experienced a reactor trip due to RCP undervoltage. All rods fully inserted, MSIV's were manually closed and decay heat is being removed by Auxiliary Feedwater pumps running and steam leaving via atmospheric relief valves. The unit is currently in a natural circulation cooldown with the diesels supplying station emergency loads. Licensee will be cooling the plant down to Mode 5.
At 1118 EST, Byron declared an Unusual Event due to a loss of offsite power on Unit 2 from a faulted Station Auxiliary Transformer (SAT). The faulted SAT caused both 6.9 kV and 4.1 kV bus voltage to drop. Smoke was observed coming from the SAT with no visible flames being apparent. This caused bus loads to trip without a complete loss of ESF busses 241 and 242. These buses were manually disconnected from the SAT, which transferred the load to the emergency diesel generators 2A and 2B. Both diesel generators started and loaded without incident. Offsite assistance was requested from the local fire department as a precaution.
The licensee is also declaring notification for 10 CFR 50.72(b)(3)(v)(D)
Unit 1 is not being affected by this event and remains at 100% power.
The licensee has notified the NRC Resident Inspector.
* * UPDATE FROM GREG BALESTRIERI TO JOHN KNOKE AT 2119 EST ON 01/31/12 * *
"At 2000 CST on 1/31/12, Byron terminated their Unusual Event due to the Loss of Offsite Power to Unit 2. Switchyard repairs were completed and offsite power has been restored to essential busses 241 and 242 thru System Auxiliary Transformers 242-1 and 242-2. Unit 2 Emergency Diesel Generators have been shutdown."
The licensee is citing classification 10 CFR 50.72(c)(1)(iii)
The licensee has notified the NRC Resident Inspector. Notified R3DO (James Cameron), NRR EO (Louise Lund), IRD MOC (Scott Morris), DHS (Konopka) and FEMA (Hollis). Licensee may issue a press release.
At 1101 EST, Byron Unit-2 experienced a reactor trip due to RCP undervoltage. All rods fully inserted, MSIV's were manually closed and decay heat is being removed by Auxiliary Feedwater pumps running and steam leaving via atmospheric relief valves. The unit is currently in a natural circulation cooldown with the diesels supplying station emergency loads. Licensee will be cooling the plant down to Mode 5.
At 1118 EST, Byron declared an Unusual Event due to a loss of offsite power on Unit 2 from a faulted Station Auxiliary Transformer (SAT). The faulted SAT caused both 6.9 kV and 4.1 kV bus voltage to drop. Smoke was observed coming from the SAT with no visible flames being apparent. This caused bus loads to trip without a complete loss of ESF busses 241 and 242. These buses were manually disconnected from the SAT, which transferred the load to the emergency diesel generators 2A and 2B. Both diesel generators started and loaded without incident. Offsite assistance was requested from the local fire department as a precaution.
The licensee is also declaring notification for 10 CFR 50.72(b)(3)(v)(D)
Unit 1 is not being affected by this event and remains at 100% power.
The licensee has notified the NRC Resident Inspector.
* * UPDATE FROM GREG BALESTRIERI TO JOHN KNOKE AT 2119 EST ON 01/31/12 * *
"At 2000 CST on 1/31/12, Byron terminated their Unusual Event due to the Loss of Offsite Power to Unit 2. Switchyard repairs were completed and offsite power has been restored to essential busses 241 and 242 thru System Auxiliary Transformers 242-1 and 242-2. Unit 2 Emergency Diesel Generators have been shutdown."
The licensee is citing classification 10 CFR 50.72(c)(1)(iii)
The licensee has notified the NRC Resident Inspector. Notified R3DO (James Cameron), NRR EO (Louise Lund), IRD MOC (Scott Morris), DHS (Konopka) and FEMA (Hollis). Licensee may issue a press release.