ENS 46666
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ENS Event | |
|---|---|
21:49 Mar 10, 2011 | |
| Title | Inadvertant Opening a Substation Breaker Causing Loss of Station Power |
| Event Description | At 1549 on 03/10/2011 with the plant shut down and the reactor defueled, power was lost to Safeguards 4160 Volt Bus 6. Diesel Generator B started and re-energized Bus 6.
At the time of the event, Bus 6 was energized from the Main Auxiliary Transformer (MAT) on backfeed. The event was caused by opening of substation breaker TA2066 as the result of an error by technicians working In the substation. All equipment operated as expected for the voltage restoration to Safeguards Bus 6. Safeguards Bus 5 remained energized from offsite power through the Tertiary Auxiliary Transformer during the event. Spent Fuel Pool Cooling Train A remained In operation during the event. Spent Fuel Cooling Train B was restarted following restoration of power to Bus 6. The loss of the MAT also resulted in the loss of non-safeguards 4160 V Buses 1-4. In response to the loss of power to Bus 4, the Technical Support Center (TSC) / Station Blackout (SBO) Diesel started and failed to load onto 480 Volt Bus 46. This resulted in a loss of power to the Technical Support Center. The loss of power to the TSC is being reported as a loss of Emergency Assessment Capability. At 1632, the TSC/SBO Diesel Generator tripped due to the failure of the output breaker to close and provide power to its support equipment. The cause of the failure of the TSC/SBO output breaker to close is unknown at this time. The licensee is investigating the cause of the breaker being opened and failure of the TSC/SBO diesel to load. One Spent Fuel Pool cooling train was in service throughout the event and no pool heatup occurred. The licensee notified the NRC Resident Inspector. |
| Where | |
|---|---|
Kewaunee  Wisconsin (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(iv)(A), System Actuation 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | |
| LER: | 05000305/LER-2011-002 |
| Time - Person (Reporting Time:+-3.33 h-0.139 days <br />-0.0198 weeks <br />-0.00456 months <br />) | |
| Opened: | Scott Cieslewicz 18:29 Mar 10, 2011 |
| NRC Officer: | Mark Abramovitz |
| Last Updated: | Mar 10, 2011 |
| 46666 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Not Critical |
| Scram | No |
| Before | Refueling Shutdown (0 %) |
| After | Refueling Shutdown (0 %) |
Kewaunee with 10 CFR 50.72(b)(3)(iv)(A), System Actuation, 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | |
WEEKMONTHYEARENS 503822014-08-20T12:47:00020 August 2014 12:47:00
[Table view]10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Service Water Return Radiation Monitor Nonfunctional for Planned Maintenance ENS 502972014-07-23T12:48:00023 July 2014 12:48:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Ventilation System Removed from Service for Planned Maintenance ENS 501312014-05-22T12:08:00022 May 2014 12:08:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Planned Maintenance on the Auxiliary Building Service Water Return Monitor ENS 499292014-03-19T12:45:00019 March 2014 12:45:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Radiation Monitor Taken Out of Service for Planned Maintenance ENS 498452014-02-20T12:55:00020 February 2014 12:55:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Auxiliary Building Service Water Return Radiation Monitor Removed from Service for Planned Maintenance ENS 497712014-01-28T13:34:00028 January 2014 13:34:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Service Water Effluent Radiation Monitor Non-Functional Due to Preplanned Maintenance ENS 497482014-01-21T12:40:00021 January 2014 12:40:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Out of Service for Planned Maintenance ENS 494992013-11-04T13:28:0004 November 2013 13:28:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Planned Maintenance on the Particulate, Iodine, and Noble Gas Radiation Monitor ENS 493652013-09-20T11:45:00020 September 2013 11:45:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Auxiliary Building Special Particulate Iodine Noble Gas (Sping) Maintenance ENS 492472013-08-07T06:00:0007 August 2013 06:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Power to Emergency Sirens Due to Severe Weather ENS 492232013-07-30T11:35:00030 July 2013 11:35:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Ventilation Out of Service for Pre-Planned Maintenance ENS 492022013-07-18T13:30:00018 July 2013 13:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Emergency Assessment Capability Due to Planned Maintenance ENS 490882013-06-04T13:30:0004 June 2013 13:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Assessment Capability Due to Planned Maintenance ENS 490262013-05-12T22:55:00012 May 2013 22:55:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Service Water Effluent Lines Non Functional ENS 489202013-04-13T16:09:00013 April 2013 16:09:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Service Water System Effluent Line Non-Functional ENS 489002013-04-09T12:30:0009 April 2013 12:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Auxiliary Building Vent Monitor Out of Service for Planned Maintenance ENS 488912013-04-05T12:30:0005 April 2013 12:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Assessment Capability Due to Planned Maintenance ENS 488812013-04-03T13:00:0003 April 2013 13:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Auxiliary Building Special Particulate Iodine Noble Gas Monitor Out of Service ENS 488302013-03-19T13:30:00019 March 2013 13:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Tsc Ventilation Removed from Service for Planned Maintenance ENS 486262012-12-26T15:22:00026 December 2012 15:22:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Radiation Monitor Used for Assessment and Response Inoperable Due to Pre-Planned Maintenance ENS 486052012-12-19T14:00:00019 December 2012 14:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Planned Maintenance Affecting the Ability to Assess an Emergency Classification ENS 483972012-10-10T21:33:00010 October 2012 21:33:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Reduced Radiation Monitoring Capability for Auxiliary Building and Containment Vent Stacks ENS 483642012-10-01T12:40:0001 October 2012 12:40:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Out-Of-Service for Planned Maintenance ENS 480162012-06-12T16:21:00012 June 2012 16:21:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Taken Out of Service for Maintenance ENS 466662011-03-10T21:49:00010 March 2011 21:49:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation, 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Inadvertant Opening a Substation Breaker Causing Loss of Station Power ENS 465272011-01-10T15:21:00010 January 2011 15:21:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Unavailability of Tsc and Eof Functions Due to Scheduled Maintenance ENS 458832010-04-30T08:00:00030 April 2010 08:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss Safety Parameter Display System (Spds) Due to Computer Problems ENS 455512009-12-09T14:00:0009 December 2009 14:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Blizzard Results in Greater than 50% Siren Coverage Loss ENS 454382009-10-15T17:04:00015 October 2009 17:04:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Momentary Loss of Shutdown Cooling with Autostart of Emergency Diesel Generator ENS 440272008-03-04T07:00:0004 March 2008 07:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Planned Maintenance on Mlshlcot Substation by Wps Results in Greater than 50% Siren Coverage Loss ENS 431962007-02-28T05:33:00028 February 2007 05:33:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Reactor Trip During the Performance of a Surveillance ENS 430962007-01-12T16:39:00012 January 2007 16:39:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Turbine Trip/Reactor Trip ENS 429832006-11-10T20:20:00010 November 2006 20:20:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Reactor Trip at Low Power ENS 429472006-10-30T14:48:00030 October 2006 14:48:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Reactor Trip ENS 425302006-04-27T01:49:00027 April 2006 01:49:00 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 Failure of Rps Signal to Initiate Reactor Trip ENS 421732005-11-29T04:20:00029 November 2005 04:20:00 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 Feed Pump Trip ENS 414252005-02-20T17:58:00020 February 2005 17:58:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Rps Actuation on Steam Generator Low Level ENS 413092005-01-06T13:00:0006 January 2005 13:00:00 Information Only, 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Modification to Process Computer That Will Impact Erds and Spds 2014-08-20T12:47:00 | |
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