ENS 41307
ENS Event | |
|---|---|
18:30 Jan 4, 2005 | |
| Title | Site Had 86.2% of Their Emergency Alert Sirens Inoperable |
| Event Description | At 1230, 1/4/05, while performing a weekly test of alert sirens utilized in the prompt public notification system, it was determined that the twenty five sirens actuated by the Callaway County Emergency Operation Center (EOC) would not operate. There are a total of twenty nine alert sirens distributed among four counties and failure of the twenty five sirens actuated by Callaway County equates to a loss of 86.2 % of the alert sirens. During the period when the faulted sirens were unavailable, the back-up automated telephone calling service Community Alerting Network System (CANS) and the tone alert radio system were available and the Callaway County EOC was instructed to perform local route notifications as a backup method of notification. At 1345, 1/4/05, the twenty five Callaway County actuated sirens were restored and all twenty nine alert sirens were tested satisfactorily.
Initial investigation indicates a computer software problem related to the feedback system. This caused a failure to occur in a circuit at the Callaway County radio tower and in the back-up manual system. The system vendor is researching the failure experienced and expects to provide a failure determination report by 1/5/05. Final corrective actions will be developed based upon the information provided by the vendor. The NRC Resident Inspector and local agencies were notified and the State will be informed.
The following information was provided by the licensee via facsimile: On 1/4/05, EN 41307 was made from the Callaway Plant Control Room reporting 25 sirens actuated by the Callaway County Emergency Operations (EOC) would not operate. The Root Cause Analysis Team determined during their investigation that a siren failure did not occur. Analysis of the computer logs and interviews with the Callaway County Emergency Management Director (EMD) and the siren vendor revealed the sirens were not activated. Investigation by the siren manufacturer and testing of the siren system verified that the sirens would have sounded if they had been activated. Prior to activating the sirens, the county Emergency Management Director (EMD) attempted to poll the sirens. This poll locked up on the first siren. The EMD and the Siren Technician assumed the locked up polling of the sirens also locked up the siren activation program and therefore did not attempt to sound the sirens. Subsequent investigation by the siren manufacturer indicated that the sirens would activate even with the system polling function locked up. On 1/14/05, testing of the system in a locked up polling configuration confirmed that the sirens would have sounded if activated. As indicated in the previous notification, all sirens were successfully sounded at 1345 on 1/4/05, when given the first signal to activate. During an emergency activation, the written instruction direct that the sirens be activated without first polling the sirens. Personnel responsible for siren activation are not responsible for siren testing and would not have hesitated to activate the sirens, had there been an actual event. Therefore, a siren activation failure did not occur. The sirens remained capable of activation if required. This notification is being retracted. The NRC Resident Inspector, State, and local government agencies have been notified by the licensee. R4DO (Clark) was informed. |
| Where | |
|---|---|
Callaway  Missouri (NRC Region 4) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | |
| Time - Person (Reporting Time:+0.03 h0.00125 days <br />1.785714e-4 weeks <br />4.1094e-5 months <br />) | |
| Opened: | James Milligan 18:32 Jan 4, 2005 |
| NRC Officer: | Chauncey Gould |
| Last Updated: | Jan 18, 2005 |
| 41307 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 532032018-02-12T10:12:00012 February 2018 10:12:00
[Table view]10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Ventilation Identified During Technical Support Center Test ENS 516492016-01-12T18:53:00012 January 2016 18:53:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Ventilation System to Emergency Off-Site Facility ENS 493982013-10-01T03:57:0001 October 2013 03:57:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Off-Site Emergency Operations Facility Declared Inoperable Due to Air In-Leakage ENS 484422012-10-25T14:30:00025 October 2012 14:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Partial Loss of Emergency Assessment During Planned Modifications ENS 482452012-08-28T20:00:00028 August 2012 20:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Determined to Be Non-Functional Due to Low Recirc Flow ENS 481122012-07-17T16:40:00017 July 2012 16:40:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Non-Functional Due to Degraded Charcoal Adsorber ENS 479302012-05-17T09:38:00017 May 2012 09:38:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Emergency Operations Facility Non-Functional Due to Failed Return Fan ENS 477492012-03-11T19:30:00011 March 2012 19:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Backup Diesel Generator Declared Non-Functional ENS 473152011-10-03T13:50:0003 October 2011 13:50:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Out of Service for Planned Maintenance ENS 472912011-09-25T23:04:00025 September 2011 23:04:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Out of Service for Planned Maintenance ENS 465812011-02-01T20:30:0001 February 2011 20:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Severe Weather Conditions ENS 461562010-08-05T20:00:0005 August 2010 20:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of All Power and Emergency Response Function at the Technical Support Center Due to Scheduled Maintenance ENS 454272009-10-12T09:00:00012 October 2009 09:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Emergency Operations Facility Inoperable Due to Loss of Ventilation ENS 443812008-08-04T14:46:0004 August 2008 14:46:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Planned Loss of Erds for Process Computer Upgrade ENS 436112007-08-31T12:03:00031 August 2007 12:03:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Emergency Response Capability - Tsc Support Center (Tsc) Due to Planned Electrical Maintenance ENS 435612007-08-13T15:00:00013 August 2007 15:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Emergency Operations Facility Ventilation Inoperable ENS 430172006-12-01T12:30:0001 December 2006 12:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Plant Access ENS 425482006-05-03T12:00:0003 May 2006 12:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Response Capability - Technical Support Center (Tsc) ENS 424972006-04-13T12:38:00013 April 2006 12:38:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Emergency Capability - Technical Support Center (Tsc) ENS 417772005-06-15T13:02:00015 June 2005 13:02:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Emergency Offsite Facility Declared Inoperable Due to Air Filtration Fan Failure to Start ENS 413292005-01-13T11:04:00013 January 2005 11:04:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Partial Loss of Offsite Communications and Ens ENS 413072005-01-04T18:30:0004 January 2005 18:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Site Had 86.2% of Their Emergency Alert Sirens Inoperable ENS 412912004-12-24T15:27:00024 December 2004 15:27:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Response Capability - Emergency Offsite Facility ENS 411912004-11-11T10:10:00011 November 2004 10:10:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Emergency Offsite Facility Declared Inoperable Due to Ventilation Failure ENS 408892004-07-21T16:55:00021 July 2004 16:55:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Eof Declared Inoperable Due to Unacceptable Air Flow Rates in Filtration Mode ENS 408612004-07-10T10:59:00010 July 2004 10:59:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Communication at the Technical Support Center Due to Scheduled Maintenance ENS 404622004-01-21T18:30:00021 January 2004 18:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Emergency Notification Siren Temperature Sensitivity 2018-02-12T10:12:00 | |