ENS 45813
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ENS Event | |
|---|---|
03:34 Apr 5, 2010 | |
| Title | Loss of Emergency Siren Activation Capability |
| Event Description | At 1400 hours0.0162 days <br />0.389 hours <br />0.00231 weeks <br />5.327e-4 months <br /> Eastern Daylight Time (EDT) on April 5, 2010, the Control Room was notified that the ability to activate the thirty-eight (38) emergency sirens within the 10 mile emergency planning zone (EPZ) radius of the plant had been lost for a period of 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> and 16 minutes from 2334 hours0.027 days <br />0.648 hours <br />0.00386 weeks <br />8.88087e-4 months <br /> EDT on April 4, 2010, until 0050 hours5.787037e-4 days <br />0.0139 hours <br />8.267196e-5 weeks <br />1.9025e-5 months <br /> on April 5, 2010. The event occurred when an Uninterruptible Power Supply (UPS), supplying radio repeaters used to activate the sirens failed. Inoperability of the repeaters impacts the ability to actuate the emergency sirens from the New Hanover County and Brunswick County Emergency Operations Centers (EOCs) as well as from the Brunswick Nuclear Plant Emergency Offsite Facility (EOF).
The failed UPS was reset and emergency siren activation capability was restored at 0050 hours5.787037e-4 days <br />0.0139 hours <br />8.267196e-5 weeks <br />1.9025e-5 months <br /> EDT on April 5, 2010. The reportability requirement associated with the inability to activate the emergency sirens was not recognized by personnel who responded to the failure and, as such, the failure was not communicated to the control room. Emergency Preparedness personnel, reviewing emergency siren computer event logs on April 5, 2010, became aware of the failure and understood its impact. This resulted in notification of the event to the control room. The initial safety significance of the event is minimal. The Brunswick and North Carolina Emergency Response Plans include compensatory measures to provide warning to affected areas, if required, in the event of the loss of sirens. The ability to activate the emergency sirens has been confirmed. Investigations into the cause of the UPS failure, as well as interim and long term corrective actions are in progress. The NRC Senior Resident Inspector has been notified of this event. |
| Where | |
|---|---|
Brunswick  North Carolina (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | |
| Time - Person (Reporting Time:+12.85 h0.535 days <br />0.0765 weeks <br />0.0176 months <br />) | |
| Opened: | John Miller 16:25 Apr 5, 2010 |
| NRC Officer: | Dong Park |
| Last Updated: | Apr 5, 2010 |
| 45813 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Not Critical |
| Scram | No |
| Before | Cold Shutdown (0 %) |
| After | Cold Shutdown (0 %) |
Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 547722020-07-10T13:00:00010 July 2020 13:00:00
[Table view]10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Planned Common Emergency Operations Facility Maintenance ENS 520692016-07-06T22:07:0006 July 2016 22:07:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Offsite Notification to the United States Department of Transportation ENS 504592014-09-15T17:09:00015 September 2014 17:09:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Emergency Siren Activation Capability ENS 503552014-08-12T08:32:00012 August 2014 08:32:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration, 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Unusual Event for a Halon Release Near the Tsc and Eof ENS 483622012-10-01T12:45:0001 October 2012 12:45:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center (Tsc) / Emergency Operations Facility (Eof) Out-Of-Service for Planned Maintenance ENS 480322012-06-17T17:30:00017 June 2012 17:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Planned Outage of Erfis, Spds, Erds, and Ppc ENS 480192012-06-12T21:57:00012 June 2012 21:57:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of the Plant Process Computer System ENS 473112011-10-01T20:00:0001 October 2011 20:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Erds Connectivity Due to a Computer Issue ENS 472152011-08-29T16:00:00029 August 2011 16:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Emergency Response Data System Out of Service for Maintenance ENS 458132010-04-05T03:34:0005 April 2010 03:34:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Emergency Siren Activation Capability ENS 427242006-07-24T21:00:00024 July 2006 21:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss and Restoration of Spds System ENS 419912005-09-14T12:32:00014 September 2005 12:32:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Offsite Emergency Preparedness Sirens ENS 419262005-08-17T20:15:00017 August 2005 20:15:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Offsite Emergency Sirensout of Service Due to Severe Weather ENS 409552004-08-14T16:25:00014 August 2004 16:25:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Several Offsite Emergency Preparedness Sirens Due to Adverse Weather ENS 403152003-11-12T15:03:00012 November 2003 15:03:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Emergency Siren Test Failure 2020-07-10T13:00:00 | |
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