ENS 47178
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ENS Event | |
|---|---|
19:13 Aug 22, 2011 | |
| Title | Manual Reactor Trip Due to Rising Condenser Backpressure |
| Event Description | 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.
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. |
| Where | |
|---|---|
Saint Lucie  Florida (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(2)(iv)(B), RPS Actuation 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release | |
| Time - Person (Reporting Time:+-1.42 h-0.0592 days <br />-0.00845 weeks <br />-0.00195 months <br />) | |
| Opened: | Robert Diehl 17:48 Aug 22, 2011 |
| NRC Officer: | Howie Crouch |
| Last Updated: | Aug 22, 2011 |
| 47178 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | Yes, Manual Scram |
| Before | Power Operation (89 %) |
| After | Hot Standby (0 %) |
Saint Lucie with 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation | |
WEEKMONTHYEARENS 572492024-07-28T22:37:00028 July 2024 22:37:00
[Table view]10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Reactor Trip ENS 571772024-06-18T07:17:00018 June 2024 07:17:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Manual Reactor Trip ENS 571612024-06-04T17:52:0004 June 2024 17:52:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Manual Reactor Trip ENS 560872022-09-03T02:48:0003 September 2022 02:48:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Manual Reactor Trip Due to Loss of Feed Pump ENS 556412021-12-10T15:24:00010 December 2021 15:24:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Manual Reactor Trip ENS 550782021-01-20T23:22:00020 January 2021 23:22:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Reactor Trip Due to Trip of Motor Control Center ENS 543622019-10-30T04:26:00030 October 2019 04:26:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Due to Release of Flammable Gas ENS 542622019-09-07T12:24:0007 September 2019 12:24:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Automatic Reactor Trip ENS 542532019-09-01T21:17:0001 September 2019 21:17:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration En Revision Imported Date 9/4/2019 ENS 540272019-04-25T13:18:00025 April 2019 13:18:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Automatic Reactor Trip Due to Turbine Generator Trip ENS 537032018-10-29T04:00:00029 October 2018 04:00:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Manual Reactor Trip Due to Inadequate Feedwater Flow ENS 536652018-10-12T04:00:00012 October 2018 04:00:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Automatic Reactor Trip ENS 530362017-10-26T06:12:00026 October 2017 06:12:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Reactor Trip Following a Loss of Load ENS 529562017-09-08T21:14:0008 September 2017 21:14:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Notification of Unusual Event - Hurricane Warning ENS 522802016-10-05T02:53:0005 October 2016 02:53:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Due to a Hurricane Warning ENS 521912016-08-21T23:37:00021 August 2016 23:37:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Unusual Event - Loss of Offsite Power ENS 513022015-08-10T02:15:00010 August 2015 02:15:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Reactor Trip During Testing ENS 506072014-11-12T20:48:00012 November 2014 20:48:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Manual Reactor Trip Due to Lowering Steam Generator Water Level ENS 497122014-01-10T17:14:00010 January 2014 17:14:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Temporary Bypass of Normal Outfall During Severe Weather ENS 495362013-11-14T17:18:00014 November 2013 17:18:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Manual Reactor Trip Due to Low Level in the 2B Steam Generator ENS 495282013-11-12T05:02:00012 November 2013 05:02:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Manual Reactor Trip Due to Unisolable Leak in Digital Electro-Hydraulic System ENS 491782013-07-08T12:30:0008 July 2013 12:30:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Sodium Hypochlorite Leak: ENS 490822013-05-31T11:12:00031 May 2013 11:12:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Manual Reactor Trip Due to an Anticipated Loss of Condenser Cooling ENS 488182013-03-12T18:51:00012 March 2013 18:51:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Automatic Reactor Trip on Thermal Margin/Low Pressure ENS 479872012-06-02T23:35:0002 June 2012 23:35:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Reactor Trip Due to a Turbine Control System Failure ENS 479152012-05-11T07:55:00011 May 2012 07:55:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Manual Reactor Trip Due to Feedwater Control Valve Failure ENS 477932012-03-31T04:22:00031 March 2012 04:22:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Manual Reactor Trip Due to Uncontrolled Cooldown ENS 477522012-03-19T03:36:00019 March 2012 03:36:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Manual Reactor Trip Due to Control Element Assembly Anomalous Behavior ENS 475832012-01-10T16:30:00010 January 2012 16:30:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification to State of Florida Due to Exceeding Wastewater Discharge Permit Limit ENS 473532011-10-19T09:28:00019 October 2011 09:28:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Manual Reactor Trip on Loss of Condenser Vacuum ENS 471782011-08-22T19:13:00022 August 2011 19:13:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Manual Reactor Trip Due to Rising Condenser Backpressure ENS 469282011-06-06T07:29:0006 June 2011 07:29:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Error During Reactor Protection System Surveillance Leads to Reactor Trip ENS 460182010-06-16T21:10:00016 June 2010 21:10:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Manual Reactor Trip After Two Control Rods Dropped ENS 458432010-04-15T19:39:00015 April 2010 19:39:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Unplanned Manual Reactor Trip ENS 454152009-10-07T07:20:0007 October 2009 07:20:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification to the State of Florida and the National Response Center ENS 449522009-04-01T22:05:0001 April 2009 22:05:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Unplanned Manual Reactor Trip ENS 448252009-02-02T20:45:0002 February 2009 20:45:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification to the Environmental Protection Agency ENS 444372008-08-22T20:20:00022 August 2008 20:20:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Hydrazine Spill ENS 442762008-06-07T12:18:0007 June 2008 12:18:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Manual Reactor Trip Following the Trip of a Condensate Pump ENS 442682008-06-04T21:30:0004 June 2008 21:30:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Manual Reactor Trip Following Loss of Main Feedwater Pump ENS 439412008-01-29T10:31:00029 January 2008 10:31:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded Manual Reactor Trip to Repair Rcp "2B1" Seal Package ENS 437232007-10-15T13:50:00015 October 2007 13:50:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification to Florida Department If Environmental Protection (Fedp) ENS 435852007-08-21T18:40:00021 August 2007 18:40:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notifications of an Oil Spill ENS 435292007-07-27T16:00:00027 July 2007 16:00:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Hydrazine Spill ENS 428042006-08-25T19:30:00025 August 2006 19:30:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Tritium Found in an Onsite Settling Pond ENS 427522006-08-02T20:00:0002 August 2006 20:00:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Hazardous Material Disposed from Owner Controlled Area ENS 426472006-06-16T02:23:00016 June 2006 02:23:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Manual Reactor Trip Due to Digital Electro-Hydraulic Leak ENS 423902006-03-06T17:20:0006 March 2006 17:20:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Lube Oil Spill ENS 422772006-01-20T13:56:00020 January 2006 13:56:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Rps Actuation ENS 421052005-11-01T03:23:0001 November 2005 03:23:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Containment Evacuation and Smoke Inhalation Treatment Due to Small Fire ENS 420982005-10-31T00:50:00031 October 2005 00:50:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification ENS 419112005-08-11T14:48:00011 August 2005 14:48:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Manual Reactor Trip on a Condensate Pump Bus Lockout ENS 413012004-12-31T04:55:00031 December 2004 04:55:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Hydrazine Release to Settling Pond Exceeded Allowed Release Rate ENS 412972004-12-27T22:20:00027 December 2004 22:20:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Manual Reactor Trip Following Problem with Steam Generator Water Level Control ENS 412932004-12-25T11:52:00025 December 2004 11:52:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Unit 2 Manually Tripped to Remove Failing Condensate Pump from Service ENS 412312004-11-29T18:50:00029 November 2004 18:50:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to 50 Gallon Hydraulic Oil Spill Onsite ENS 411212004-10-14T20:10:00014 October 2004 20:10:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification for Exceeding State Permit Limits ENS 410672004-09-24T21:00:00024 September 2004 21:00:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Entered Unusual Event Classification Due to Hurricane Warning in Effect ENS 410182004-09-04T05:56:0004 September 2004 05:56:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Manual Reactor Trip Due to Steam Generator Level Oscillations ENS 404822004-01-27T13:05:00027 January 2004 13:05:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Offsite Notification of Loss of Communications ENS 404032003-12-20T14:49:00020 December 2003 14:49:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Rps Actuation Due to Loss of Turbine Generator Excitation ENS 403752003-12-04T21:32:0004 December 2003 21:32:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation St. Lucie Unit 2 Manual Reactor Trip Due to Loss of Condensate Pump ENS 396312003-03-02T19:30:0002 March 2003 19:30:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification to State Agency of Expired Green Sea Turtle Found at Barrier Net 2024-07-28T22:37:00 | |
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