ENS 48968
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ENS Event | |
|---|---|
22:59 Apr 25, 2013 | |
| Title | Vent Stack Radiation Monitors De-Energized for Short Duration During Pre-Planned Maintenance |
| Event Description | This is a report of a loss of emergency assessment capability as required by 10 CFR 50.72(b)(3)(xiii).
On April 25, 2013 at 1759 CDT, with Unit 2 in Mode 6 during a refueling outage, power was interrupted to all Unit 2 vent stack radiation monitors as part of a pre-planned activity to connect the radiation monitors to an alternate temporary power supply to support de-energizing the normal power source for preventative maintenance. The connection to the alternate supply was completed and power was restored to the vent stack radiation monitors at 1845 CDT. While the radiation monitors were without power, pre-planned compensatory measures were implemented to monitor vent stack discharge and to minimize activities that posed a potential for release. At the completion of the preventive maintenance on the normal power supply, power to the vent stack radiation monitors will again be briefly interrupted to reconnect the normal power source to the monitors. The pre-planned compensatory measures will again be utilized during this power interruption. An update to this report will be provided following the restoration of normal power to the radiation monitors. The NRC Resident inspector has been informed.
On 28 April, 2013, power was again interrupted to the Unit 2 vent stack radiation monitors to restore the connection to their normal power supply. The radiation monitors were out of service from 2315 until 2340 CDT. Pre-planned compensatory measures were again implemented to monitor vent stack discharge and minimize potential for vent stack release. The reported time for the initial loss of vent stack radiation monitoring on April 25, 2013 was incorrect. The correct time was 1759 CDT. The NRC Resident has been notified. Notified R2DO (Sykes). |
| Where | |
|---|---|
Farley  Alabama (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | |
| Time - Person (Reporting Time:+-2.13 h-0.0888 days <br />-0.0127 weeks <br />-0.00292 months <br />) | |
| Opened: | Josh Carroll 20:51 Apr 25, 2013 |
| NRC Officer: | Bill Huffman |
| Last Updated: | Apr 29, 2013 |
| 48968 - NRC Website
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WEEKMONTHYEARENS 521572016-08-05T17:09:0005 August 2016 17:09:00
[Table view]10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Fire Detection Panel Failure and Loss of Assessment Capability ENS 506772014-12-13T07:52:00013 December 2014 07:52:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Malfunction of Smoke Detection System in Containment Due to High Humidity ENS 506042014-11-12T08:02:00012 November 2014 08:02:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness No Functional Smoke Detection Capability in Containment ENS 500342014-04-14T11:00:00014 April 2014 11:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Post-Accident Hydrogen Sample Analyzers Out-Of-Service ENS 499012014-03-12T13:41:00012 March 2014 13:41:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Pyro Panel Maintenance Results in Loss of Emergency Assessment Capability ENS 498622014-02-28T14:42:00028 February 2014 14:42:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Pyro Panel Removed from Service for Maintenance ENS 497892014-02-03T18:00:0003 February 2014 18:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Out of Service Due to a Refrigerant Leak in the Hvac System ENS 497442014-01-18T16:20:00018 January 2014 16:20:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Unit 2 Pyro Panel Non-Functional Due to Unknown Equipment Problems ENS 497352014-01-17T15:25:00017 January 2014 15:25:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Pyro Panel Taken Out of Service for Planned Maintenance ENS 496372013-12-16T20:54:00016 December 2013 20:54:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Containment Smoke Detection Capability ENS 496192013-12-09T15:06:0009 December 2013 15:06:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Smoke Detection Panel Removed from Service for Planned Maintenance ENS 494172013-10-07T23:04:0007 October 2013 23:04:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Vent Stack and Area Radiation Monitors Taken Out of Service for Maintenance ENS 490912013-06-05T15:39:0005 June 2013 15:39:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Communications with the Integrated Plant Computer ENS 489682013-04-25T22:59:00025 April 2013 22:59:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Vent Stack Radiation Monitors De-Energized for Short Duration During Pre-Planned Maintenance ENS 489262013-04-16T05:37:00016 April 2013 05:37:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Main Control Board Annunciation During Loss-Of-Offsite-Power Test ENS 487182013-02-05T16:05:0005 February 2013 16:05:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Non-Functional Due to Hvac System Malfunction ENS 486722013-01-14T18:55:00014 January 2013 18:55:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Out-Of-Service Due to Failed Air Conditioning Belt ENS 480262012-06-14T18:53:00014 June 2012 18:53:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Control Room Annunciator Outage ENS 479242012-05-15T12:20:00015 May 2012 12:20:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Planned Maintenance ENS 479202012-05-13T01:15:00013 May 2012 01:15:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Hvac for Technical Support Center Out of Service ENS 469072011-06-01T13:18:0001 June 2011 13:18:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Out of Service Due to Ventilation Condenser Unit Failure ENS 468292011-05-08T13:25:0008 May 2011 13:25:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Malfunctioning Technical Support Center Ventilation ENS 467652011-04-18T13:00:00018 April 2011 13:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Ventilation Out of Service for Planned Maintenance ENS 465392011-01-14T17:25:00014 January 2011 17:25:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Out of Service Due to Planned Maintenance ENS 464812010-12-14T23:40:00014 December 2010 23:40:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Ens Phone Lines Out of Service Due to a Failed Rectifier ENS 462662010-09-22T13:26:00022 September 2010 13:26:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Hvac Unit Out of Service for Maintenance ENS 461232010-07-23T13:52:00023 July 2010 13:52:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Temporary Outage of Public Prompt Notification System Due to a Bomb Threat Offsite ENS 459162010-05-11T14:30:00011 May 2010 14:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Technical Support Center ENS 459062010-05-06T19:40:0006 May 2010 19:40:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Nonfunctional ENS 431332007-01-30T14:35:00030 January 2007 14:35:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Spds Due to Planned Maintenance ENS 429712006-11-08T14:05:0008 November 2006 14:05:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Plant Computer Down for Upgrade ENS 422802006-01-20T16:17:00020 January 2006 16:17:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Public Prompt Notification Systems Sirens Discovered Inoperable ENS 422672006-01-18T17:34:00018 January 2006 17:34:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Offsite Public Prompt Notification for Greater than One Hour ENS 404432004-01-13T19:55:00013 January 2004 19:55:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Communication and Emergency Notification System 2016-08-05T17:09:00 | |
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