ENS 50143
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ENS Event | |
|---|---|
06:52 May 26, 2014 | |
| Title | Control Room Overhead Annunciator Malfunction |
| Event Description | At time 0252 EDT, the control room overhead annunciators malfunctioned resulting in the inability to receive more than one station alarm input and could not be acknowledged using the normal station alarm acknowledge pushbutton.
This condition existed from time 0252 EDT until time 0516 EDT on 5/26/2014 at which time the system was restored. During the entire period, backup assessment capability was functional, dependent upon redundant assets as described in existing station documentation and/or functionality of the control room alarm typer. Additionally, the station computer alarms and Safety Parameter Display System remained functional during the entire time period. The licensee will continue to investigate the annunciator system. The licensee notified the NRC Resident Inspector. The licensee will also notify State and local government agencies. |
| Where | |
|---|---|
Davis Besse  Ohio (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | |
| Time - Person (Reporting Time:+3.78 h0.158 days <br />0.0225 weeks <br />0.00518 months <br />) | |
| Opened: | Eric Horvath 10:39 May 26, 2014 |
| NRC Officer: | Donald Norwood |
| Last Updated: | May 26, 2014 |
| 50143 - NRC Website
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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 | |
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