ENS Event | |
|---|---|
07:36 May 21, 2014 | |
| Title | Control Room Overhead Annunciator Malfunction |
| Event Description | At 0336 [CDT] on 5/21/14, during activities to isolate the preferred power supply for wiring modification, all control room annunciators cleared and lost power due to a disconnect switch failure associated with the alternate power supply. The normal power supply was restored at 0349 [CDT] to restore the annunciators to functional status. During the brief period of time the annunciators were unavailable, redundant assets as described in existing station documentation and/or the control room alarm typer remained functional along with the station computer alarms and Safety Parameter Display System to provide backup assessment capability.
This event was previously determined to not be reportable, however, following additional review of the significance this is reportable. The NRC Resident has been notified of the event. The late reporting of this event has been entered into the Corrective Action Program. The licensee notified the State of Ohio as well as Lucas and Ottawa counties. |
| Where | |
|---|---|
Davis Besse  Ohio (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | |
| Time - Person (Reporting Time:+1034.97 h43.124 days <br />6.161 weeks <br />1.418 months <br />) | |
| Opened: | Eric Horvath 10:34 Jul 3, 2014 |
| NRC Officer: | Howie Crouch |
| Last Updated: | Jul 3, 2014 |
| 50252 - NRC Website
Loading map... | |
Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 501432014-05-26T06:52:00026 May 2014 06:52:00
[Table view]10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Control Room Overhead Annunciator Malfunction ENS 502522014-05-21T07:36:00021 May 2014 07:36:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Control Room Overhead Annunciator Malfunction ENS 495462013-11-17T17:33:00017 November 2013 17:33:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness All Control Room Annunciators in Alarm ENS 476702012-02-16T18:42:00016 February 2012 18:42:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Spds Greater than Eight (8) Hours Due to Hard Drive Failure ENS 432922007-04-09T11:30:0009 April 2007 11:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Seismic Monitoring System Out of Service ENS 431642007-02-14T01:12:00014 February 2007 01:12:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Offsite Communications Capability Due to a Power Outage in Toledo, Ohio ENS 412862004-12-23T11:14:00023 December 2004 11:14:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Response Capability ENS 407342004-05-07T16:00:0007 May 2004 16:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Emergency Preparedness Capability Due to Inability to Activate Sirens 2014-05-26T06:52:00 | |