ENS 46879
ENS Event | |
|---|---|
14:18 May 24, 2011 | |
| Title | Loss of Power to Thirty-Two Emergency Sirens |
| Event Description | This 8-hour notification is being made per the reporting requirements specified by 10 CFR 50.72(b)(3)xiii.
At 0946 CDT on May 24, 2011, the TVA Corporate Operations Duty Specialist notified the Nuclear Power Group Emergency Duty Officer that the fifteen minute communication test for Lawrence County indicated a loss of communications with the Lawrence County siren activation system. At 0958 CDT, Lawrence County Alabama Emergency Management Agency (EMA) staff reported that a transformer had de-energized at 0918 CDT and that both the primary siren activation point (Lawrence County EMA office) and the backup activation point (Moulton, Alabama Fire Department) were without power. The EMA offices normally have backup power supplied by a diesel generator. However, the generator had failed during EMA operations associated with the April 27, 2011 tornadoes. The State of Alabama had supplied a generator for temporary use but this generator required manual actions for making connections in order for it to be placed into service. At 1003 CDT, electrical power was restored and the primary and backup siren activation points were returned to service. Browns Ferry has 100 ANS sirens and 32 are located in Lawrence County. All of the 32 Lawrence County sirens were affected. The duration of the condition was estimated to be approximately 45 minutes (0918 CDT through 1003 CDT). (Note that the polling system that provides the out of service times polls the system every 15 minutes so the timeframe by necessity is an approximation.) Both primary and backup activation systems were operable at 1003 CDT. A silent test was performed from the Lawrence County EMA office at 1159 CDT with all 32 Lawrence County sirens satisfactorily responding. The licensee has notified the State of Alabama, the Lawrence County EMA and the NRC Resident Inspector of this report. |
| Where | |
|---|---|
Browns Ferry  Alabama (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | |
| Time - Person (Reporting Time:+3.63 h0.151 days <br />0.0216 weeks <br />0.00497 months <br />) | |
| Opened: | Ricky Givens 17:56 May 24, 2011 |
| NRC Officer: | Howie Crouch |
| Last Updated: | May 24, 2011 |
| 46879 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (19 %) |
| After | Power Operation (19 %) |
Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (18 %) |
| After | Power Operation (18 %) |
Unit 3 | |
|---|---|
| Reactor critical | Not Critical |
| Scram | No |
| Before | Cold Shutdown (0 %) |
| After | Cold Shutdown (0 %) |
WEEKMONTHYEARENS 543822019-11-12T12:00:00012 November 2019 12:00:00
[Table view]10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Emergency Operations Facility Out of Service ENS 542782019-09-13T09:27:00013 September 2019 09:27:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness En Revision Imported Date 9/17/2019 ENS 520042016-06-13T22:33:00013 June 2016 22:33:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Alert Sirens Failed to Rotate ENS 494552013-10-19T22:05:00019 October 2013 22:05:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Partial Loss of Offsite Communications Due to a Blown Fuse ENS 488232013-03-14T23:00:00014 March 2013 23:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Partial Loss of Offsite Communications ENS 483272012-09-20T17:40:00020 September 2012 17:40:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Emergency Assessment Capability Due to Inoperable Seismic Monitoring Instrumentation ENS 471242011-08-04T13:35:0004 August 2011 13:35:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Power to Emergency Sirens Due to Weather ENS 469862011-06-25T21:15:00025 June 2011 21:15:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Meteorological Monitoring Instrumentation Inoperable Due to Loss of Power ENS 468792011-05-24T14:18:00024 May 2011 14:18:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Power to Thirty-Two Emergency Sirens ENS 467932011-04-27T22:01:00027 April 2011 22:01:00 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)(xiii), Loss of Emergency Preparedness Notification of Unusual Event Due to Loss of Offsite Power ENS 444712008-09-07T22:20:0007 September 2008 22:20:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Partial Loss of Offsite Communication Capability Caused by an Unplanned Power Outage ENS 442322008-05-21T20:15:00021 May 2008 20:15:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Control Room Phone Communications 2019-09-13T09:27:00 | |