ENS 47390
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ENS Event | |
|---|---|
23:18 Oct 29, 2011 | |
| Title | Loss of Greater than 25% of Emergency Notification System Sirens Due to Weather Conditions |
| Event Description | At approximately 1818 EDT on October 29, 2011, Three Mile Island Nuclear Generating Station received notification that 25 of 96 emergency notification system offsite sirens were not functional. The loss of >25% of the sirens is considered a Major Loss of Emergency Preparedness Capabilities (10CFR50.72(b)(3)(xiii)). The loss of offsite sirens was due to loss of electrical power caused by significant heavy snowfall in the area. Efforts are in place to restore offsite sirens to service.
The licensee stated that compensatory measures are in place should their be a need to notify the areas affected by the lost sirens. The licensee has notified State and local authorities. The NRC Resident Inspector will be notified. |
| Where | |
|---|---|
Three Mile Island  Pennsylvania (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | |
| Time - Person (Reporting Time:+-3.53 h-0.147 days <br />-0.021 weeks <br />-0.00484 months <br />) | |
| Opened: | Clint Six 19:46 Oct 29, 2011 |
| NRC Officer: | Bill Huffman |
| Last Updated: | Oct 29, 2011 |
| 47390 - NRC Website | |
Unit 1 | |
|---|---|
| Reactor critical | Not Critical |
| Scram | No |
| Before | Cold Shutdown (0 %) |
| After | Cold Shutdown (0 %) |
WEEKMONTHYEARENS 520972016-07-18T20:00:00018 July 2016 20:00:00
[Table view]10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Offsite Communications Capability ENS 509322015-03-27T17:00:00027 March 2015 17:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Seismic Monitor Not Available for Emergency Plan Assessment ENS 488552013-03-27T12:00:00027 March 2013 12:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Ventilation Out of Service for Maintenance ENS 487142013-02-05T13:00:0005 February 2013 13:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Ventilation System Out of Service ENS 486252012-12-26T09:10:00026 December 2012 09:10:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Ventilation System Out of Service ENS 474192011-11-07T01:03:0007 November 2011 01:03:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Spds and Plant Process Computer Due to Planned Maintenance ENS 473902011-10-29T23:18:00029 October 2011 23:18:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Greater than 25% of Emergency Notification System Sirens Due to Weather Conditions ENS 470312011-07-06T18:40:0006 July 2011 18:40:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center (Tsc) Hvac Out of Service Due to Loss of Power ENS 459292010-05-14T19:30:00014 May 2010 19:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Nonfunctional ENS 453592009-09-17T17:00:00017 September 2009 17:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Emergency Response Data System Inoperable for Greater than Eight Hours ENS 452312009-07-27T14:00:00027 July 2009 14:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center (Tsc) Hvac Found Degraded Due to Water Intrusion ENS 437722007-11-05T21:49:0005 November 2007 21:49:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Spds Out of Service for Planned Maintenance ENS 437602007-10-31T03:30:00031 October 2007 03:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Outage of Safety Parameter Display System (Spds) and Emergency Response Data ENS 424132006-03-13T16:10:00013 March 2006 16:10:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Ventilation Fan Inoperable ENS 401782003-09-19T06:24:00019 September 2003 06:24:00 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 Loss of Emergency Siren Capability Due to Adverse Weather Conditions ENS 401212003-08-29T19:05:00029 August 2003 19:05:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Degradation of Emergency Preparedness Response Capabilities 2016-07-18T20:00:00 | |
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