ENS 47031
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ENS Event | |
|---|---|
18:40 Jul 6, 2011 | |
| Title | Technical Support Center (Tsc) Hvac Out of Service Due to Loss of Power |
| Event Description | At about 1440 EDT on July 6, 2011, the Technical Support Center (TSC) HVAC lost power during motor control switch testing. The transfer switch did not fully engage resulting in loss of power to the TSC HVAC fan motor. Troubleshooting was performed and power was restored to the TSC HVAC system at approximately 1625 EDT.
This involved an emergent loss of the TSC capability that could not be readily remediated in less than the TSC staffing time of one hour. Unrelated to the first event, 13.2 KV power to the TMI station office buildings was lost at approximately 1740 EDT on July 6, 2011 due to a broken electric service pole. This resulted in another loss of the TSC HVAC that could not be readily remediated. At 2115 EDT power was restored and the ventilation was started. This event resulted in another reportable condition. These events affected the ability of the TSC ventilation to maintain adequate radiological habitability in the event of an emergency with an airborne radiological release. All other capabilities were unaffected by this emergent condition. Existing procedures provide direction to relocate TSC personnel in the event of a TSC habitability concern, however the backup facility does not have standby electrical power or a filtered ventilation system. The licensee has informed the NRC Resident Inspector. |
| Where | |
|---|---|
Three Mile Island  Pennsylvania (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | |
| Time - Person (Reporting Time:+3.12 h0.13 days <br />0.0186 weeks <br />0.00427 months <br />) | |
| Opened: | Joe Shoffner 21:47 Jul 6, 2011 |
| NRC Officer: | Charles Teal |
| Last Updated: | Jul 6, 2011 |
| 47031 - NRC Website | |
Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 520972016-07-18T20:00:00018 July 2016 20:00:00
[Table view]10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Offsite Communications Capability ENS 509322015-03-27T17:00:00027 March 2015 17:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Seismic Monitor Not Available for Emergency Plan Assessment ENS 488552013-03-27T12:00:00027 March 2013 12:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Ventilation Out of Service for Maintenance ENS 487142013-02-05T13:00:0005 February 2013 13:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Ventilation System Out of Service ENS 486252012-12-26T09:10:00026 December 2012 09:10:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Ventilation System Out of Service ENS 474192011-11-07T01:03:0007 November 2011 01:03:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Spds and Plant Process Computer Due to Planned Maintenance ENS 473902011-10-29T23:18:00029 October 2011 23:18:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Greater than 25% of Emergency Notification System Sirens Due to Weather Conditions ENS 470312011-07-06T18:40:0006 July 2011 18:40:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center (Tsc) Hvac Out of Service Due to Loss of Power ENS 459292010-05-14T19:30:00014 May 2010 19:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Nonfunctional ENS 453592009-09-17T17:00:00017 September 2009 17:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Emergency Response Data System Inoperable for Greater than Eight Hours ENS 452312009-07-27T14:00:00027 July 2009 14:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center (Tsc) Hvac Found Degraded Due to Water Intrusion ENS 437722007-11-05T21:49:0005 November 2007 21:49:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Spds Out of Service for Planned Maintenance ENS 437602007-10-31T03:30:00031 October 2007 03:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Outage of Safety Parameter Display System (Spds) and Emergency Response Data ENS 424132006-03-13T16:10:00013 March 2006 16:10:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Ventilation Fan Inoperable ENS 401782003-09-19T06:24:00019 September 2003 06:24:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Emergency Siren Capability Due to Adverse Weather Conditions ENS 401212003-08-29T19:05:00029 August 2003 19:05:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Degradation of Emergency Preparedness Response Capabilities 2016-07-18T20:00:00 | |
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