Event Notification Report for August 22, 2011
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
08/21/2011 - 08/22/2011
EVENT NUMBERS
47178
Power Reactor
Event Number: 47178
Facility: SAINT LUCIE
Region: 2 State: FL
Unit: [1] [] []
RX Type: [1] CE,[2] CE
NRC Notified By: ROBERT DIEHL
HQ OPS Officer: HOWIE CROUCH
Region: 2 State: FL
Unit: [1] [] []
RX Type: [1] CE,[2] CE
NRC Notified By: ROBERT DIEHL
HQ OPS Officer: HOWIE CROUCH
Notification Date: 08/22/2011
Notification Time: 17:48 [ET]
Event Date: 08/22/2011
Event Time: 15:13 [EDT]
Last Update Date: 08/22/2011
Notification Time: 17:48 [ET]
Event Date: 08/22/2011
Event Time: 15:13 [EDT]
Last Update Date: 08/22/2011
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL 50.72(b)(2)(xi) - OFFSITE NOTIFICATION
10 CFR Section:
50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL 50.72(b)(2)(xi) - OFFSITE NOTIFICATION
Person (Organization):
SCOTT SHAEFFER (R2DO)
SCOTT SHAEFFER (R2DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | M/R | Y | 89 | Power Operation | 0 | Hot Standby |
MANUAL REACTOR TRIP DUE TO RISING CONDENSER BACKPRESSURE
"On August 22, 2011 at 1513 [hrs. EDT], Unit 1 was manually tripped due to rising condenser backpressure. All CEAs fully inserted into the core. Decay heat removal was initially from main feedwater and steam bypass to the main condenser. The cause of the rising back pressure was an influx of jellyfish into the intake structure, degrading the circulating water system performance.
"Subsequent to the manual trip, the 1B Main Feedwater Pump was manually secured due to a leak on the pump casing. The 1A Main Feedwater Pump subsequently tripped due to low suction pressure after manually securing the 1B Condensate Pump, per procedure. Decay heat removal was transitioned to atmospheric dump valves and auxiliary feedwater.
"Unit 2 is in Mode 1, currently at 70 % power. Unit 2 power is being reduced from 100% in response to the influx of jellyfish.
"This event is reportable pursuant to 10 CFR 50.72(b)(2)(iv)(B) for the reactor trip."
During the transient, no primary or secondary relief valves lifted. Offsite power is stable and the plant is in its normal shutdown electrical line-up with power being supplied from offsite. There is no known primary-to-secondary leakage. The cause of the 1A Main Feedwater Pump trip is under investigation.
Unit 2 remained at 70% reactor power before and after the event.
The licensee has notified the NRC Resident Inspector.
* * * UPDATE AT 1856 EDT ON 08/22/11 FROM CARLOS SANTOS TO JOE O'HARA * * *
"On August 22, 2011 an abnormal fish kill of at least 1000 lbs was observed in the combined unit's intake canal. The cause of the fish kill was related to an unusually large sustained influx of jellyfish into the intake canal.
"Per the plant's environmental permit, the Florida Fish and Wildlife Conservation Commission (FWCC) was notified at 1627 EDT. This non-emergency notification is being made pursuant to 10 CFR 50.72(b)(2)(xi) due to the notification of the FWCC."
The licensee has notified the NRC Resident Inspector.
"On August 22, 2011 at 1513 [hrs. EDT], Unit 1 was manually tripped due to rising condenser backpressure. All CEAs fully inserted into the core. Decay heat removal was initially from main feedwater and steam bypass to the main condenser. The cause of the rising back pressure was an influx of jellyfish into the intake structure, degrading the circulating water system performance.
"Subsequent to the manual trip, the 1B Main Feedwater Pump was manually secured due to a leak on the pump casing. The 1A Main Feedwater Pump subsequently tripped due to low suction pressure after manually securing the 1B Condensate Pump, per procedure. Decay heat removal was transitioned to atmospheric dump valves and auxiliary feedwater.
"Unit 2 is in Mode 1, currently at 70 % power. Unit 2 power is being reduced from 100% in response to the influx of jellyfish.
"This event is reportable pursuant to 10 CFR 50.72(b)(2)(iv)(B) for the reactor trip."
During the transient, no primary or secondary relief valves lifted. Offsite power is stable and the plant is in its normal shutdown electrical line-up with power being supplied from offsite. There is no known primary-to-secondary leakage. The cause of the 1A Main Feedwater Pump trip is under investigation.
Unit 2 remained at 70% reactor power before and after the event.
The licensee has notified the NRC Resident Inspector.
* * * UPDATE AT 1856 EDT ON 08/22/11 FROM CARLOS SANTOS TO JOE O'HARA * * *
"On August 22, 2011 an abnormal fish kill of at least 1000 lbs was observed in the combined unit's intake canal. The cause of the fish kill was related to an unusually large sustained influx of jellyfish into the intake canal.
"Per the plant's environmental permit, the Florida Fish and Wildlife Conservation Commission (FWCC) was notified at 1627 EDT. This non-emergency notification is being made pursuant to 10 CFR 50.72(b)(2)(xi) due to the notification of the FWCC."
The licensee has notified the NRC Resident Inspector.