ENS 42206
ENS Event | |
|---|---|
14:30 Dec 15, 2005 | |
| Title | Loss of Emergency Siren Power |
| Event Description | On December 15, 2005, at 0930 hours0.0108 days <br />0.258 hours <br />0.00154 weeks <br />3.53865e-4 months <br />, it was determined that approximately 17 of 65 Oconee Nuclear Station emergency sirens, located in Pickens and Oconee Counties, failed to send a feedback signal when checked. It is postulated that these sirens are inoperable due to a loss of power attributed to severe icing conditions currently being experienced in both counties. At the time of discovery, current weather conditions were a steady light rain with a temperature of 33 degrees F.
Duke is currently attempting to restore power to the affected sirens but does not expect to have all of the inoperable sirens back in service until later in the day. During the loss of siren period, a compensatory means of notifying the public has been put into place to include routing of local law enforcement personnel to the affected areas for public notification should an emergency occur at the station. Because more than 25% of the sirens were unavailable as a result of this event, this event constitutes a major loss of notification capability; consequently, this event is reported as an eight -hour notification in accordance with 10CFR50.72(b)(3)(xiii) reporting criteria. The licensee notified the NRC Resident Inspector and applicable station personnel. Initial Safety Significance: None. Compensatory measures have been put into place to ensure that the members of the public located in the affected areas are appropriately notified by local law enforcement personnel. All three Oconee units remain operable in Mode 1 (100 percent Power) and are unaffected by this condition. Corrective Action(s): Duke will attempt to have all of the inoperable sirens restored as soon as possible and will maintain the compensatory action in-place until full restoration has been completed.
On December 15, 2005, at 0930 hours0.0108 days <br />0.258 hours <br />0.00154 weeks <br />3.53865e-4 months <br />, it was determined that approximately 17 of 65 Oconee Nuclear Station emergency sirens, located in Pickens and Oconee Counties, failed to send a feedback signal when checked. It is postulated that these sirens are inoperable due to a loss of power attributed to severe icing conditions currently being experienced in both counties. At the time of discovery, current weather conditions were a steady light rain with a temperature of 33 degrees F. Throughout the day and night of December 15th, additional sirens were lost. A maximum number of 40 sirens were eventually lost. On December 16th, 2005, at 0815 Emergency Planning contacted Oconee and Pickens County to assess the siren outage due to ice storm on 12-15-05 and the results of the assessment were that Pickens County still had 17 sirens out of service and Oconee County still had 9 sirens out of service due to the ice storm. The ONS resident NRC inspector was notified this morning at 0818 of the siren issue and all of his questions and concerns were answered. Duke Power Company Community Affairs was also notified. On December 16th, 2005, at 1509, Emergency Planning contacted Oconee and Pickens County. The results were that Pickens County still has 11 sirens out of service and Oconee County still has 2 sirens out of service due to the ice storm. This reduces the total number of sirens out of service to less than the threshold considered a major loss of offsite response capability per the 10CFR 50.72 notification requirements. Duke is currently attempting to restore power to all the affected sirens. Power is expected to be restored to the entire service area by Sunday. During the loss of siren period, a compensatory means of notifying the public was put into place to include routing of local law enforcement personnel to the affected areas for public notification should an emergency occur at the station. Initial Safety Significance: 12-16-05, Safety Significance has not changed. None. Compensatory measures have been put into place to ensure that the members of the public located in the affected service areas are appropriately notified by local law enforcement personnel. All three Oconee units remain operable in Mode 1 (100 percent power) and are unaffected by this condition. Corrective Action(s): Duke will attempt to have all the inoperable sirens restored as soon as possible and will maintain the compensatory action in-place until full restoration has been completed. The R2DO(Decker) had been notified.
This update (December 20, 2005) is to report that all sirens have now been returned to service and tested. Duke has completed repairs to restore and test all sirens. Full restoration has been completed. R2DO (Paul Fredrickson) notified. NRC Resident Inspector will be notified of this update by the licensee. |
| Where | |
|---|---|
Oconee  South Carolina (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | |
| Time - Person (Reporting Time:+-2.18 h-0.0908 days <br />-0.013 weeks <br />-0.00299 months <br />) | |
| Opened: | Stephan C. Newman 12:19 Dec 15, 2005 |
| NRC Officer: | Joe O'Hara |
| Last Updated: | Dec 20, 2005 |
| 42206 - NRC Website | |
Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
Unit 3 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 547712020-07-10T13:00:00010 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 545092020-02-03T14:15:0003 February 2020 14:15:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Emergency Assessment Capability Due to Planned Tsc and Osc Upgrades ENS 495112013-11-07T17:00:0007 November 2013 17:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Taken Out of Service for Planned Maintenance ENS 487702013-02-19T15:54:00019 February 2013 15:54:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Oconee Alert and Notification System Sirens Out of Service ENS 484072012-10-15T10:56:00015 October 2012 10:56:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Area Radiation Monitor Used for Emergency Assessment Failed ENS 482842012-09-06T00:06:0006 September 2012 00:06:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Inoperable Accident Radiation Monitors ENS 482652012-09-02T16:00:0002 September 2012 16:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Planned Outage of Emergency Operations Facility ENS 482642012-09-02T02:30:0002 September 2012 02:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Radiation Monitor Declared Inoperable ENS 422062005-12-15T14:30:00015 December 2005 14:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Emergency Siren Power ENS 410502004-09-17T14:30:00017 September 2004 14:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Siren Capability 2020-07-10T13:00:00 | |