ENS 44738
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ENS Event | |
|---|---|
14:22 Dec 21, 2008 | |
| Title | Weather Related Loss of Emergency Sirens |
| Event Description | This telephone notification is provided in accordance with 10 CFR 50.72(b)(3)(xiii) to report complications from an ice storm, including a loss of power, which has disabled seventeen (17) of the fifty EP sirens (34%). The sirens were lost at 07:22 CST and have not been restored.
This meets the threshold of Reportability based on the loss of a public notification system. Restoration efforts are underway and are expected to occur as soon as reasonably possible with the current winter weather conditions. At the time of the event, Unit 1 is at 80% power for scheduled surveillances and Unit 2 is at 98% power due to end of cycle conditions, and neither Unit power level is related to this event. Unit 1 will return to full power as scheduled and Unit 2 will remain at 98% power and both units are unaffected by the loss of power. Twelve of the lost sirens were due to a loss of power. Five were lost due to a loss of communications with the data center. The licensee notified the NRC Resident Inspector. |
| Where | |
|---|---|
LaSalle  Illinois (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | |
| Time - Person (Reporting Time:+-2.67 h-0.111 days <br />-0.0159 weeks <br />-0.00366 months <br />) | |
| Opened: | Michael Fitzpatrick 11:42 Dec 21, 2008 |
| NRC Officer: | Mark Abramovitz |
| Last Updated: | Dec 21, 2008 |
| 44738 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (80 %) |
| After | Power Operation (80 %) |
Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (98 %) |
| After | Power Operation (98 %) |
WEEKMONTHYEARENS 577662025-06-17T17:57:00017 June 2025 17:57:00
[Table view]10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Unplanned Maintenance of Technical Support Center Supply Fan ENS 563642023-02-06T11:30:0006 February 2023 11:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Communications and Assessment Capabilities ENS 550862021-01-29T03:30:00029 January 2021 03:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Degraded Due to Supply Fan Belt Failure ENS 521042016-07-18T19:50:00018 July 2016 19:50:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Offsite Communications Capability ENS 515302015-11-11T19:44:00011 November 2015 19:44:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Seismic Monitor Inoperable ENS 512472015-07-22T05:13:00022 July 2015 05:13:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Seismic Monitor Inoperable ENS 512132015-07-08T23:37:0008 July 2015 23:37:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Ventilation Out of Service ENS 512052015-07-08T06:30:0008 July 2015 06:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Seismic Monitor Inoperable ENS 511642015-06-17T23:41:00017 June 2015 23:41:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Ventilation System Return Damper Failed Closed ENS 511332015-06-06T17:13:0006 June 2015 17:13:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Technical Support Center Ventilation ENS 509262015-03-26T18:30:00026 March 2015 18:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Seismic Monitor Not Available for Emergency Plan Assessment ENS 504642014-09-17T13:00:00017 September 2014 13:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Ventilation System Removed from Service for Planned Maintenance ENS 497762014-01-29T15:53:00029 January 2014 15:53:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Technical Support Center Ventilation Fan ENS 490802013-05-30T14:00:00030 May 2013 14:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Ventilation System Maintenance ENS 484372012-10-24T13:25:00024 October 2012 13:25:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Ventilation Removed from Service for Planned Maintenance ENS 481032012-07-13T15:50:00013 July 2012 15:50:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Tsc Out of Service Due to Failed Fan Belt ENS 474272011-11-10T07:00:00010 November 2011 07:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Out of Service Due to Planned Maintenance ENS 453522009-09-16T06:39:00016 September 2009 06:39:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Communications ENS 453412009-09-11T14:04:00011 September 2009 14:04:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Unavailable ENS 447382008-12-21T14:22:00021 December 2008 14:22:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Weather Related Loss of Emergency Sirens ENS 430202006-12-01T17:42:0001 December 2006 17:42:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Thirteen Emergency Sirens 2025-06-17T17:57:00 | |
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