ENS 49106
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ENS Event | |
|---|---|
02:05 Jun 12, 2013 | |
| Title | Unit 1 Automatic Reactor Trip Due to the Loss of a Start-Up Transformer |
| Event Description | This is a report of an automatic RPS actuation and automatic ESF actuation per 10CFR50.72(b)(2)(iv)(B) and 10CFR50.72(b)(3)(iv)(A). Additionally, this is to report intentions for a press release per 10CFR50.72(b)(2)(xi).
At 2105 CDT on 6/11/13, Farley Unit 1 experienced an automatic reactor trip from 100% power. The initiating event was the loss of the 1B Start up Transformer which resulted in de-energization of the B-Train ESF 4KV buses and the 1B and 1C Reactor Coolant Pump Buses. The 1B Emergency Diesel Generator auto started and tied to the B-Train 4KV Emergency buses. Both MDAFW (Motor Driven Auxiliary Feedwater) Pumps and the TDAFW (Turbine Driven Auxiliary Feedwater) Pump auto-started and are supplying AFW flow to the steam generators. Decay heat removal is via the steam dumps to the main condenser. The cause of the loss of the 1B Start-up Transformer is unknown and is currently under investigation. All other systems functioned as expected in response to the loss of the 1B Start-up Transformer and reactor trip. The NRC Senior Resident Inspector has been notified. A press release is planned. All control rods fully inserted. There is no impact on Unit 2. Currently the licensee does not plan to restart the 1B and 1C Reactor Coolant Pumps. Pressurizer spray has been isolated from the 1B loop per procedure. Main Condenser vacuum is adequate for decay heat removal. |
| Where | |
|---|---|
Farley  Alabama (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(2)(iv)(B), RPS Actuation 10 CFR 50.72(b)(3)(iv)(A), System Actuation 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release | |
| Time - Person (Reporting Time:+-0.53 h-0.0221 days <br />-0.00315 weeks <br />-7.25994e-4 months <br />) | |
| Opened: | William Arens 01:33 Jun 12, 2013 |
| NRC Officer: | Charles Teal |
| Last Updated: | Jun 12, 2013 |
| 49106 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | A/R |
| Before | Power Operation (100 %) |
| After | Hot Standby (0 %) |
Farley 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, 10 CFR 50.72(b)(3)(iv)(A), System Actuation | |
WEEKMONTHYEARENS 577892025-06-28T03:09:00028 June 2025 03:09:00
[Table view]10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Manual Reactor Trip and Automatic Actuation of Auxiliary Feedwater System ENS 577692025-06-20T01:27:00020 June 2025 01:27:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Reactor Trip and Automatic Actuation of Auxiliary Feedwater System ENS 569712024-02-16T11:34:00016 February 2024 11:34:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Manual Reactor Trip and Automatic Actuation of Auxiliary Feedwater System ENS 568522023-11-14T16:41:00014 November 2023 16:41:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Manual Reactor Trip ENS 563292023-02-01T15:56:0001 February 2023 15:56:00 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 and Automatic Actuation of Auxiliary Feedwater System ENS 560282022-08-03T17:58:0003 August 2022 17:58:00 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 Loss of Power to START-UP Transformer ENS 554622021-09-15T11:58:00015 September 2021 11:58:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Employee Fatality ENS 542872019-09-21T13:00:00021 September 2019 13:00:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Manual Trip Due to Reactor Coolant Pump Vibration Alarm ENS 540402019-05-01T21:43:0001 May 2019 21:43:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation En Revision Imported Date 5/9/2019 ENS 540022019-04-16T04:55:00016 April 2019 04:55:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification - on Site Fataility ENS 523952016-11-27T06:26:00027 November 2016 06:26:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Manual Reactor Trip with Automatic Auxiliary Feedwater System Actuation Due to Voltage Oscillations ENS 523562016-11-08T06:00:0008 November 2016 06:00:00 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 Steam Generator Reduced Feedflow ENS 522742016-10-01T10:12:0001 October 2016 10:12:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation, 10 CFR 50.72(b)(2)(iv)(A), System Actuation - ECCS Discharge Automatic Reactor Trip Due to Inadvertent Closure of Main Steam Isolation Valve ENS 520612016-07-01T17:05:0001 July 2016 17:05:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Inadvertent Actuation of Emergency Sirens ENS 519182016-05-11T11:53:00011 May 2016 11:53:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Farley Unit 2 Trip on Hi Hi Steam Generator Level ENS 510432015-05-05T09:22:0005 May 2015 09:22:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Auxiliary Feedwater Pump Auto Start Signal Initiated During Startup ENS 510082015-04-23T22:17:00023 April 2015 22:17:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Worker Fatality Not Related to Plant Operation ENS 506182014-11-15T09:53:00015 November 2014 09:53:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Valid Actuation of the Reactor Protection System for Abnormal Rod Position Indication ENS 505332014-10-14T08:41:00014 October 2014 08:41:00 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 a Start-Up Transformer ENS 491062013-06-12T02:05:00012 June 2013 02:05:00 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, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Unit 1 Automatic Reactor Trip Due to the Loss of a Start-Up Transformer ENS 491012013-06-07T20:50:0007 June 2013 20:50:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to an Onsite Employee Fatality ENS 478132012-04-06T19:44:0006 April 2012 19:44:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Valid Load Shed Signal Occurred Due to Loss of the 1B Startup Transformer ENS 478092012-04-05T17:20:0005 April 2012 17:20:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Unplanned Systems Actuations While Performing a Surveillance Test ENS 466612011-03-07T07:40:0007 March 2011 07:40:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Inadvertant Auto-Start Signal to the 1B Diesel Generator During Testing ENS 459462010-05-22T21:34:00022 May 2010 21:34:00 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 Steam Generator Water Level Control ENS 458892010-05-01T02:00:0001 May 2010 02:00:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Inadvertent System Actuation Occurred During a Surveillance Test ENS 448552009-02-16T22:55:00016 February 2009 22:55:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Inadvertent Relay Actuation Results in Auto Start of 1C Emergency Diesel Generator ENS 446662008-11-19T10:25:00019 November 2008 10:25:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Automatic Reactor Trip ENS 436872007-10-03T19:10:0003 October 2007 19:10:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Reactor Trip on Loss of Forced Flow to Rcs Loop "a ENS 411752004-11-05T15:11:0005 November 2004 15:11:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Inadvertent Loss of "B" Train Site Power During Testing ENS 406672004-04-12T08:47:00012 April 2004 08:47:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Unit 2 Experienced a Reactor Trip During Startup Due to an Invalid Sr Trip Signal ENS 406662004-04-11T16:05:00011 April 2004 16:05:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Automatic Reactor Trip for Unknown Reasons During Plant Startup ENS 405582004-03-01T11:22:0001 March 2004 11:22:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Unit 1 Experienced a Reactor Trip on Turbine Trip Due to a Feedwater System Problem ENS 403092003-11-10T16:36:00010 November 2003 16:36:00 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 False Rcp Breaker Open Signal 2025-06-28T03:09:00 | |
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