Event Notification Report for February 26, 2008
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
02/25/2008 - 02/26/2008
EVENT NUMBERS
44009
Power Reactor
Event Number: 44009
Facility: TURKEY POINT
Region: 2 State: FL
Unit: [3] [4] []
RX Type: [3] W-3-LP,[4] W-3-LP
NRC Notified By: DAVID FUNK
HQ OPS Officer: JOE O'HARA
Region: 2 State: FL
Unit: [3] [4] []
RX Type: [3] W-3-LP,[4] W-3-LP
NRC Notified By: DAVID FUNK
HQ OPS Officer: JOE O'HARA
Notification Date: 02/26/2008
Notification Time: 14:38 [ET]
Event Date: 02/26/2008
Event Time: 13:09 [EST]
Last Update Date: 02/26/2008
Notification Time: 14:38 [ET]
Event Date: 02/26/2008
Event Time: 13:09 [EST]
Last Update Date: 02/26/2008
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL 50.72(b)(3)(iv)(A) - VALID SPECIF SYS ACTUATION
10 CFR Section:
50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL 50.72(b)(3)(iv)(A) - VALID SPECIF SYS ACTUATION
Person (Organization):
ROBERT HAAG (R2)
MARY JANE ROSS-LEE (NRR)
ROBERT HAAG (R2)
MARY JANE ROSS-LEE (NRR)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 3 | A/R | Y | 100 | Power Operation | 0 | Hot Standby |
| 4 | A/R | Y | 100 | Power Operation | 0 | Hot Standby |
UNITS 3 AND 4 TRIPPED DUE TO GRID FLUCTUATIONS
"At 1309 both U-3 and U-4 tripped from 100% power due to a momentary power fluctuation caused by grid instabilities. All systems responded normally with the exception of the 4C non-vital 4KV bus which deenergized. All vital 4KV busses on both units are supplied from offsite power and both units are stable with Auxiliary Feed Water supplying feed to all steam generators. Current information from system indicates the grid is stable. 4C non-vital 4KV bus restoration is complete."
No relief valves or safeties lifted. Decay heat path is AFW to S/G's with normal heat sink to the condenser and canal. All safety related equipment is operable and in standby. No ECCS actuation.
FPL has not given a cause of the grid disturbance. The licensee is investigating the cause of the non-vital bus deenergizing.
The Florida State Warning Point has been notified.
The licensee notified the NRC Resident Inspector.
* * *UPDATE PROVIDED BY MARK JONES TO JEFF ROTTON AT 1732 EST ON 02/26/08 * * *
The licensee provided the following update to report a valid specified System actuation per 10CFR50.72(b)(3)(iv)(A) that occurred at 1614 EST on 02/26/08.
"At 1614, an inadvertent initiation of the Auxiliary Feedwater (AFW) System occurred on Unit 4.
"During the Unit 4 reactor trip, the 4C 4KV bus de-energized due to grid transient. This caused the 4B Steam Generator Feed Pump (SGFP) breaker to trip with control switch in 'mid after start' position. Later, with the control switch for the 4B SGFP still in 'mid after start' position, operators performed a procedure to swap feed source for the steam generators from SGFP to Standby SGFP. As part of this procedure, the 4A SGFP was secured. When the control switch for the 4A SGFP was taken to stop, the logic for start of the Auxiliary Feedwater System was met due to loss of last running SGFP.
"The AFW system responded as expected for an auto initiation. Initiation of the AFW system was noted by the operators, and actions were taken to control feed flow rate and Reactor Coolant System temperature, pressure and inventory. The AFW system has been restored to standby status."
The licensee has notified the NRC Resident Inspector. Notified the R2DO (Munday).
"At 1309 both U-3 and U-4 tripped from 100% power due to a momentary power fluctuation caused by grid instabilities. All systems responded normally with the exception of the 4C non-vital 4KV bus which deenergized. All vital 4KV busses on both units are supplied from offsite power and both units are stable with Auxiliary Feed Water supplying feed to all steam generators. Current information from system indicates the grid is stable. 4C non-vital 4KV bus restoration is complete."
No relief valves or safeties lifted. Decay heat path is AFW to S/G's with normal heat sink to the condenser and canal. All safety related equipment is operable and in standby. No ECCS actuation.
FPL has not given a cause of the grid disturbance. The licensee is investigating the cause of the non-vital bus deenergizing.
The Florida State Warning Point has been notified.
The licensee notified the NRC Resident Inspector.
* * *UPDATE PROVIDED BY MARK JONES TO JEFF ROTTON AT 1732 EST ON 02/26/08 * * *
The licensee provided the following update to report a valid specified System actuation per 10CFR50.72(b)(3)(iv)(A) that occurred at 1614 EST on 02/26/08.
"At 1614, an inadvertent initiation of the Auxiliary Feedwater (AFW) System occurred on Unit 4.
"During the Unit 4 reactor trip, the 4C 4KV bus de-energized due to grid transient. This caused the 4B Steam Generator Feed Pump (SGFP) breaker to trip with control switch in 'mid after start' position. Later, with the control switch for the 4B SGFP still in 'mid after start' position, operators performed a procedure to swap feed source for the steam generators from SGFP to Standby SGFP. As part of this procedure, the 4A SGFP was secured. When the control switch for the 4A SGFP was taken to stop, the logic for start of the Auxiliary Feedwater System was met due to loss of last running SGFP.
"The AFW system responded as expected for an auto initiation. Initiation of the AFW system was noted by the operators, and actions were taken to control feed flow rate and Reactor Coolant System temperature, pressure and inventory. The AFW system has been restored to standby status."
The licensee has notified the NRC Resident Inspector. Notified the R2DO (Munday).