ENS 50957
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ENS Event | |
|---|---|
13:09 Apr 6, 2015 | |
| Title | Technical Support Center Out of Service for Planned Maintenance |
| Event Description | On 04/06/2015, planned preventive maintenance activities are being performed on the Braidwood Generating Station Technical Support Center (TSC) Ventilation System. The work will be completed within approximately 42 hours4.861111e-4 days <br />0.0117 hours <br />6.944444e-5 weeks <br />1.5981e-5 months <br />. This activity includes preventive maintenance on the TSC condensing unit which affects the TSC ventilation. During the planned maintenance, the TSC condensing unit will be rendered non-functional.
If an emergency is declared requiring TSC activation during this period, the TSC will be staffed and activated using existing emergency planning procedures unless the TSC becomes uninhabitable due to ambient temperature or other conditions. If relocation of the TSC becomes necessary, the Emergency Director will relocate the TSC staff as necessary. This planned maintenance will not impact the emergency filtration capability of the TSC. This event is reportable per 10CFR50.72(b)(3)(xiii) for 'any event that results in a major loss of emergency assessment capability.' The planned maintenance will not be able to restore the TSC condensing unit to service within the facility activation time specified in the emergency plan (1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />) in the event of an accident. The Emergency Response Organization team has been notified of the maintenance and the possible need to relocate during an emergency. The licensee has notified the NRC Resident Inspector.
The TSC ventilation system has been restored to normal operation as of 0600 CDT on April 8, 2015. The NRC Resident Inspector has been notified. Notified R3DO (Skokowski). |
| Where | |
|---|---|
Braidwood  Illinois (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | |
| Time - Person (Reporting Time:+-4 h-0.167 days <br />-0.0238 weeks <br />-0.00548 months <br />) | |
| Opened: | Greg Harnois 09:09 Apr 6, 2015 |
| NRC Officer: | Mark Abramovitz |
| Last Updated: | Apr 8, 2015 |
| 50957 - NRC Website
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Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 563522023-02-06T11:30:0006 February 2023 11:30:00
[Table view]10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Communications and Assessment Capabilities ENS 553252021-06-24T14:01:00024 June 2021 14:01:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Technical Support Center Capability ENS 540902019-05-26T00:30:00026 May 2019 00:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Main Control Room Area Radiation Monitors ENS 531802018-01-23T10:00:00023 January 2018 10:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Assessment Capability Due to Technical Support Center Planned Maintenance ENS 521032016-07-18T20:00:00018 July 2016 20:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Offsite Communications Capability ENS 511542015-06-15T12:00:00015 June 2015 12:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Tsc Ventilation to Be Removed from Service for Planned Maintenance ENS 510922015-05-27T14:45:00027 May 2015 14:45:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Out of Service for Planned Maintenance ENS 509572015-04-06T13:09:0006 April 2015 13:09:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Out of Service for Planned Maintenance ENS 509332015-03-27T14:41:00027 March 2015 14:41:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Seismic Monitor Not Available for Emergency Plan Assessment ENS 504312014-09-06T11:13:0006 September 2014 11:13:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Air Conditioning Condensing Units Out of Service ENS 503972014-08-25T10:00:00025 August 2014 10:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Planned Maintenance ENS 502472014-07-01T12:15:0001 July 2014 12:15:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Offsite Alert and Notification System Failure ENS 501622014-06-01T18:14:0001 June 2014 18:14:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Technical Support Center Cooling Capability ENS 497232013-10-16T19:20:00016 October 2013 19:20:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Out of Service ENS 483282012-09-21T01:35:00021 September 2012 01:35:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Ventilation Inoperable ENS 478452012-04-18T02:30:00018 April 2012 02:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Plant Process Computer Removed from Service for Planned Replacement ENS 476222012-01-26T03:00:00026 January 2012 03:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Out of Service Due to Planned Maintenance ENS 467662011-04-19T04:09:00019 April 2011 04:09:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Plant Process Computer Removed from Service for Planned Replacement ENS 435902007-08-23T20:30:00023 August 2007 20:30:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation, 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Manual Reactor Trip Because of Lowering Condenser Vacuum ENS 431372007-02-01T15:25:0001 February 2007 15:25:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Offsite Phone Connections ENS 418582005-07-21T00:17:00021 July 2005 00:17:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Emergency Sirens Failed for One Hour ENS 409222004-08-04T12:15:0004 August 2004 12:15:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Emergency Notification Due to Inoperable Sirens 2023-02-06T11:30:00 | |
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