ENS 42096
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ENS Event | |
|---|---|
17:25 Oct 29, 2005 | |
| Title | Unusual Event - Main Transformer Fire |
| Event Description | NUE declared on Hatch Unit 1 due to a fire on the main transformer lasting greater than 10 minutes. Unit 1 reactor scram on main turbine trip. Group 2 PCIV (Primary Containment Isolation Valves) isolation on low reactor water level (+3 inches). All group 2 valves closed as required. Fire extinguished at 1358 hours0.0157 days <br />0.377 hours <br />0.00225 weeks <br />5.16719e-4 months <br />. Plant is stable.
All control rods fully inserted on the reactor scram. The plant is in hot shutdown steaming through the turbine bypass valves to the main condenser. No safety systems are affected. Emergency electrical buses are on normal offsite power and emergency diesel generators are available if required. The onsite fire brigade responded to the fire and the fire suppression system for the main transformer functioned as expected. The licensee notified the NRC Resident Inspector.
The licensee is still in a NUE. The fire is out. The fire reflashed at 1603 when the deluge system was secured to inspect the transformer. The deluge system was restarted immediately. Offsite fire support have responded. Cleanup efforts are in progress. The licensee notified the NRC Resident Inspector. Notified IRD (Blount), R2DO (Cahill), and NRR EO (J. Hannon).
The licensee is still in a NUE. This call is to add an offsite notification per 10 CFR 72.75 (b)(2) to another government agency. The site chemistry department notified the National Response Center (Coast Guard) at 1636 that the site had discharged an unknown quantity of oil into the Altamaha River and was implementing site spill control and countermeasures procedures. The licensee also notified the Georgia Environmental Protection Division. The licensee notified the NRC Resident Inspector. Notified IRD (Blount), NRR EO (J. Hannon), and R2DO(Cahill).
The licensee reports that the fire is confirmed extinguished (i.e., no risk of reflash) based on long term monitoring of the transformer including thermography measurements. The Unit remains in an Unusual Event until assessment activities related to the transformer fire have been completed. The licensee notified the NRC Resident Inspector.
|
| Where | |
|---|---|
Hatch  Georgia (NRC Region 2) | |
| Reporting | |
| Emergency class: | Unusual Event |
| 10 CFR 50.72(a) (1) (i), Emergency Class Declaration 10 CFR 50.72(b)(2)(iv)(B), RPS Actuation 10 CFR 50.72(b)(3)(iv)(A), System Actuation | |
| Time - Person (Reporting Time:+-2.57 h-0.107 days <br />-0.0153 weeks <br />-0.00352 months <br />) | |
| Opened: | Al Dees 14:51 Oct 29, 2005 |
| NRC Officer: | Pete Snyder |
| Last Updated: | Oct 30, 2005 |
| 42096 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | A/R |
| Before | Power Operation (100 %) |
| After | Hot Shutdown (0 %) |
Hatch with 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 | |
WEEKMONTHYEARENS 570212024-03-11T17:37:00011 March 2024 17:37:00
[Table view]10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation, 10 CFR 50.72(b)(2)(iv)(A), System Actuation - ECCS Discharge Manual Reactor Trip ENS 568262023-11-01T10:48:0001 November 2023 10:48:00 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)(2)(iv)(A), System Actuation - ECCS Discharge Manual Reactor Trip Due to Trip of Reactor Feed Pump ENS 564462023-03-31T18:32:00031 March 2023 18:32:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Manual Reactor Scram and Automatic Actuation of Containment Isolation Valves (Civs) ENS 556792021-12-29T20:52:00029 December 2021 20:52:00 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 Containment Isolation Valves ENS 553942021-08-03T14:26:0003 August 2021 14:26:00 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 539532019-03-24T05:59:00024 March 2019 05:59:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Manual Reactor Scram Due to Degrading Condenser Vacuum ENS 538932019-02-23T07:12:00023 February 2019 07:12:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Actuation of 2C Emergency Diesel Generator ENS 527002017-04-21T03:45:00021 April 2017 03:45:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Valid Reactor Protection System Actuation While Shutdown ENS 526962017-04-20T07:02:00020 April 2017 07:02:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Automatic Reactor Scram During Startup ENS 525582017-02-16T18:20:00016 February 2017 18:20:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Unexpected Autostart of an Emergency Diesel Generator ENS 525262017-02-01T21:05:0001 February 2017 21:05:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event - Potential Security Event ENS 519502016-05-23T14:09:00023 May 2016 14:09:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Plant Hatch Unit 2 Containment Isolation Valve Actuation ENS 487602013-02-16T08:10:00016 February 2013 08:10:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Reactor Protection System Scram Signal Due to Scram Discharge Volume High Level ENS 487382013-02-10T12:00:00010 February 2013 12:00:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Manual Reactor Scram Inserted Due to Degrading Reactor Water Chemistry ENS 473692011-10-24T20:11:00024 October 2011 20:11:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Manual Reactor Scram Due to Erratic Irm Indications During Startup ENS 462582010-09-18T20:27:00018 September 2010 20:27:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Declared Due to High-High Reactor Building Sump Level Alarm ENS 462272010-09-03T02:50:0003 September 2010 02:50:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Notification of Unusual Event Declared Due to High Water Level in the Rcic Instrument Sump ENS 458502010-04-16T23:17:00016 April 2010 23:17:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Loss of Cooling Accident Signal Due to High Drywell Pressure Signal ENS 451482009-06-23T07:51:00023 June 2009 07:51:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Reactor Scram Due to High Reactor Water Level ENS 451452009-06-20T18:17:00020 June 2009 18:17:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Automatic Reactor Scram from High Reactor Pressure Scram Signal ENS 450712009-05-15T09:19:00015 May 2009 09:19:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Group 1 Isolation of All Main Steam Valves While Performing a Special Procedure ENS 450522009-05-10T14:41:00010 May 2009 14:41:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Intermediate Range Reactor Scram During Transition to Run ENS 450492009-05-08T19:15:0008 May 2009 19:15:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Inadvertant Main Steam Isolation While Performing Maintenance ENS 448152009-01-29T13:50:00029 January 2009 13:50:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event - Toxic Gas Discharge in Waste Gas Treatment Building ENS 446792008-11-22T15:18:00022 November 2008 15:18:00 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 Manual Reactor Scram After Feed Pump Trip ENS 443372008-07-04T12:39:0004 July 2008 12:39:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Reactor Scram on Turbine Trip ENS 440462008-03-07T19:46:0007 March 2008 19:46:00 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 Scram with Hpci/Rcic Actuation Due to Loss of Condensate Feedwater ENS 435522007-08-07T19:06:0007 August 2007 19:06:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Reactor Scram on Low Reactor Water Level Following Partial Loss of Condensate Feedwater Flow ENS 435412007-08-01T06:05:0001 August 2007 06:05:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Declared Due to Fire in Protected Area Greater than 10 Minutes ENS 425372006-05-01T08:39:0001 May 2006 08:39:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Declared Due to a Fire in an Isophase Bus Duct Lasting 11 Minutes ENS 424712006-04-05T04:16:0005 April 2006 04:16:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(2)(iv)(A), System Actuation - ECCS Discharge Reactor Scram Following Main Turbine Control Valve Fast Closure ENS 420962005-10-29T17:25:00029 October 2005 17:25:00 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 - Main Transformer Fire ENS 417252005-05-23T21:47:00023 May 2005 21:47:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Manual Scram Due to Condenser Hotwell Chemistry ENS 413812005-02-08T01:55:0008 February 2005 01:55:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Plant Had a Freon Leak in the Drywell Chiller Room ENS 410702004-09-25T05:06:00025 September 2004 05:06:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Group 2 Containment Isolation Actuation ENS 405652004-03-03T18:45:0003 March 2004 18:45:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Swing Diesel Generator Auto Started from a Bus Undervoltage Valid Signal ENS 404282004-01-06T17:58:0006 January 2004 17:58:00 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 Declared Due to Fire on Refuel Floor 2024-03-11T17:37:00 | |
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