ENS 58020: Difference between revisions
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Revision as of 07:20, 4 November 2025
ENS Event | |
|---|---|
17:15 Nov 3, 2025 | |
| Title | Emergency Diesel Generator (EDG) Actuation |
| Event Description | The following information was provided by the licensee via phone and email:
On November 3, 2025, at 1215 EST, the 'A' reserve station service transformer (RSST) pilot wire lockout actuated while restoring the 'A' RSST to service. This resulted in the electrical isolation of the 'A' RSST and the Unit 1 'J' emergency bus. The #3 EDG automatically started and loaded onto the Unit 1 'J' emergency bus, as designed. Operations entered the appropriate abnormal procedures and ensured stable conditions. All safety systems functioned as designed and all electrical parameters remained stable. No radiological consequences resulted from this event. This event is being reported pursuant to 10CFR50.72(b)(3)(iv)(A) due to actuation of the #3 EDG. The NRC Resident Inspector was notified. |
| Where | |
|---|---|
Surry  Virginia (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(iv)(A), System Actuation | |
| Time - Person (Reporting Time:+-0.13 h-0.00542 days <br />-7.738095e-4 weeks <br />-1.78074e-4 months <br />) | |
| Opened: | Scott Satterfield 17:07 Nov 3, 2025 |
| NRC Officer: | Adam Koziol |
| Last Updated: | Nov 3, 2025 |
| 58020 - NRC Website
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WEEKMONTHYEARENS 580202025-11-03T17:15:0003 November 2025 17:15:00
[Table view]10 CFR 50.72(b)(3)(iv)(A), System Actuation Emergency Diesel Generator (EDG) Actuation ENS 578542025-08-06T22:47:0006 August 2025 22:47:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Reactor Trip ENS 537362018-11-12T05:00:00012 November 2018 05:00:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Specified System Actuation ENS 536622018-10-11T04:00:00011 October 2018 04:00:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Actuation of Emergency Diesel Generator Due to Transformer Trip ENS 531702018-01-17T14:52:00017 January 2018 14:52:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Auto-Start of Emergency Diesel Generator Due to Transformer Fuses Being Disconnected ENS 522922016-10-09T06:54:0009 October 2016 06:54:00 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 Main Generator Differential Lockout Turbine Trip ENS 514672015-10-13T22:15:00013 October 2015 22:15:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Reactor Trip After a Turbine Trip ENS 514022015-09-17T00:14:00017 September 2015 00:14:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Start and Loading of the #2 Emergency Diesel Generator ENS 505292014-10-13T11:58:00013 October 2014 11:58:00 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 a Spurious Overpower / Delta Temperature Signal ENS 486382012-12-29T13:03:00029 December 2012 13:03:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Emergency Diesel Generator Auto-Start and Load Upon Trip of Reserve Station Transformer ENS 469052011-05-30T12:08:00030 May 2011 12:08:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Specified System Actuation - Afw Initiation ENS 467612011-04-16T22:55:00016 April 2011 22:55:00 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(a)(1)(i), Emergency Class Declaration, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Unusual Event Declared Due to Loss of All Offsite Power from Tornado Damage ENS 465842011-02-02T10:33:0002 February 2011 10:33:00 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 Rcs Coolant Flow in One Loop ENS 459862010-06-08T13:48:0008 June 2010 13:48:00 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)(3)(xiii), Loss of Emergency Preparedness, 10 CFR 50.72(b)(2)(iv)(A), System Actuation - ECCS Discharge Automatic Reactor Trip with Safety Injection Due to Loss of Vital Ac Bus ENS 442212008-05-17T13:04:00017 May 2008 13:04:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Failed Relay Causes Emergency Diesel Generator to Start ENS 441522008-04-21T02:16:00021 April 2008 02:16:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Unit 1 Manual Reactor Trip Due to Main Turbine Vibrations ENS 413832005-02-08T01:23:0008 February 2005 01:23:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Manual Reactor Trip During Startup Due to Indication of Misaligned Rod ENS 407692004-05-22T01:08:00022 May 2004 01:08:00 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 Generator Leads Failure ENS 401682003-09-18T13:00:00018 September 2003 13:00:00 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 Declared Due to Expected Severe Weather 2025-08-06T22:47:00 | |
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