ENS 47566
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ENS Event | |
|---|---|
09:00 Jan 3, 2012 | |
| Title | Unavailability of Technical Support Center Ventilation Due to Scheduled Maintenance |
| Event Description | At 0400 EST on Tuesday, January 3, 2012, the Cook Nuclear Plant (CNP) Technical Support Center (TSC) air conditioning and charcoal filtration systems will be removed from service for scheduled maintenance.
Under certain accident conditions the TSC may become unavailable due to the inability of the air conditioning and charcoal filtration systems to maintain a habitable atmosphere. Compensatory measures exist to relocate TSC personnel to the unaffected unit's control room if necessary. TSC ventilation system maintenance is scheduled to be completed by 1500 EST on Tuesday, January 3, 2012. The licensee has notified the NRC Resident Inspector.
The TSC ventilation system maintenance was completed satisfactorily and the system was restored to service at 1644 EST on 1/3/12. The licensee notified the NRC Resident Inspector. Notified R3DO (Valos).
UNAVAILABILITY OF TSC VENTILATION SYSTEM DUE TO DAMPER FAILURE This is an update to EN#47566. At 2300 EST on Tuesday, January 3, 2012, the Cook Nuclear Plant (CNP) Technical Support Center (TSC) air conditioning and charcoal filtration system volume damper 12-HV-TSC-SD-6, TSC Ventilation Normal Flow to and from Air Conditioner HV-TSC-AC-1 Volume Damper, did not reposition during surveillance 12-OHP-5030-028-007 TSC Ventilation Filtration System Functional Test. When the damper position was checked, damper remained open with system in Emergency mode. Per 12-OHP-5030-028-007, if any damper fails to reposition, the ventilation unit is considered non-functional. Under certain accident conditions the TSC may become unavailable due to the inability of the air conditioning and charcoal filtration systems to maintain a habitable atmosphere. Compensatory measures exist to relocate TSC personnel to the unaffected unit's control room if necessary. TSC ventilation system maintenance had previously been performed to clean, inspect, and lubricate linkages associated with this damper on 1-3-2012. That work was completed at approximately 1700 EST on 1-3-2012. Following discovery, maintenance was contacted and discovered the linkage was loose for 12-HV-TSC-SD-6. Maintenance adjusted the linkage and damper was retested satisfactory at 0311 EST on 1-4-2012. TSC functionality has been restored. The licensee has notified the NRC Resident Inspector. This notification is being made in accordance with 10 CFR 50.72 (b)(3)(xiii) due to the loss of an emergency response facility. R3DO (Valos) notified. |
| Where | |
|---|---|
Cook  Michigan (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | |
| Time - Person (Reporting Time:+-5.45 h-0.227 days <br />-0.0324 weeks <br />-0.00747 months <br />) | |
| Opened: | Mark Essig 03:33 Jan 3, 2012 |
| NRC Officer: | Pete Snyder |
| Last Updated: | Jan 4, 2012 |
| 47566 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 502382014-06-30T11:30:00030 June 2014 11:30:00
[Table view]10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Planned Maintenance on Technical Support Center Ventilation ENS 502232014-06-24T15:00:00024 June 2014 15:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Unavailability of Tsc Ventilation System Due to Scheduled Maintenance ENS 498032014-02-07T08:00:0007 February 2014 08:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Unavailabiliity of Tsc Ventilation System Due to Scheduled Maintenance ENS 496872014-01-01T16:00:0001 January 2014 16:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Tsc Ventilation System Non-Functional ENS 496822013-12-31T15:50:00031 December 2013 15:50:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Unavailability of Tsc Ventilation System Due to Scheduled Maintenance ENS 495632013-11-21T01:00:00021 November 2013 01:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Emergency Preparedness Capabilities Due to Unit 2 Plant Process Computer Replacement ENS 492892013-08-19T13:00:00019 August 2013 13:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Emergency Preparedness Capabilities Due to Unit 1 Ppc Replacement ENS 491912013-07-15T13:34:00015 July 2013 13:34:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Unplanned Loss of Communications Due to Offsite Fiber Optic Cable Damage ENS 491702013-07-03T05:15:0003 July 2013 05:15:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Unavailability of Technical Support Center Ventilation System Due to Scheduled Maintenance ENS 489802013-04-29T13:00:00029 April 2013 13:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Tsc Ventilation System Out of Service for Scheduled Maintenance ENS 489222013-04-14T18:00:00014 April 2013 18:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Unavailability of Tsc Ventilation System Due to Scheduled Maintenance ENS 486452013-01-03T08:00:0003 January 2013 08:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Unavailability of Tsc Ventilation System Due to Scheduled Maintenance ENS 485042012-11-13T14:00:00013 November 2012 14:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Partial Loss of Emergency Assessment During Planned Modifications ENS 480602012-07-02T06:00:0002 July 2012 06:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Unavailability of Tsc Ventilation System Due to Scheduled Maintenance ENS 478012012-04-03T12:00:0003 April 2012 12:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Unit 2 Plant Process Computer Out-Of-Service for Planned Maintenance ENS 477942012-04-01T08:26:0001 April 2012 08:26:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Unavailability of Tsc Ventilation System Due to Scheduled Maintenance ENS 475662012-01-03T09:00:0003 January 2012 09:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Unavailability of Technical Support Center Ventilation Due to Scheduled Maintenance ENS 473172011-10-04T08:00:0004 October 2011 08:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Unavailability of Tsc Ventilation System Due to Scheduled Maintenance ENS 470402011-07-11T08:00:00011 July 2011 08:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Unavailability of Tsc Ventilation System Due to Scheduled Maintenance ENS 470252011-07-06T08:00:0006 July 2011 08:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Unavailability of Tsc Ventilation System Due to Scheduled Maintenance ENS 467312011-04-06T08:00:0006 April 2011 08:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Ventilation System Out of Service Due to Planned Maintenance ENS 465202011-01-04T13:00:0004 January 2011 13:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Unavailability of Tsc Ventilation System Due to Scheduled Maintenance ENS 463392010-10-18T14:00:00018 October 2010 14:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Unavailability of Emergency Response Data System (Erds) for Scheduled Maintenance ENS 463102010-10-06T11:00:0006 October 2010 11:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Unavailability of Tsc Ventilation System Due to Scheduled Maintenance ENS 460892010-07-13T12:10:00013 July 2010 12:10:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Unavailability of Tsc Ventilation System Due to Scheduled Maintenance ENS 458312010-04-12T08:00:00012 April 2010 08:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Scheduled Maintenance on the Technical Support Center Ventilation System ENS 456982010-02-15T14:30:00015 February 2010 14:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Unavailability of Emergency Response Data System (Erds) Due to Plant Process Computer (Ppc) Scheduled Maintenance ENS 456532010-01-25T14:30:00025 January 2010 14:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Emergency Response Data System Unavailable Due to Plant Process Computer Maintenance ENS 456202010-01-12T09:00:00012 January 2010 09:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Unavailability of Tsc Ventilation System and Charcoal Filter for Scheduled Maintenance ENS 454542009-10-22T04:01:00022 October 2009 04:01:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Out of Service for Ventilation System and Charcoal Filter Maintenance ENS 454292009-10-13T11:44:00013 October 2009 11:44:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Unavailable Due to Planned Maintenance ENS 453112009-08-31T11:21:00031 August 2009 11:21:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Tsc Potentially Out of Service ENS 451852009-07-06T11:12:0006 July 2009 11:12:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Unavailability of Tsc Ventilation System and Charcoal Filter for Scheduled Maintenance ENS 449922009-04-15T08:15:00015 April 2009 08:15:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Unavailability of Tsc Ventilation System and Charcoal Filter During Scheduled Maintenance ENS 447652009-01-13T14:07:00013 January 2009 14:07:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Unavailable Due to Scheduled Hvac Maintenance ENS 445702008-10-16T15:00:00016 October 2008 15:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Partial Unavailability of Tsc Ventilation Air Conditioning System for Scheduled Maintenance ENS 445422008-10-06T08:45:0006 October 2008 08:45:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Unavailability of Tsc Ventilation System and Charcoal Filter for Scheduled Maintenance ENS 443902008-08-07T16:15:0007 August 2008 16:15:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Unavailability of Technical Support Center ENS 443242008-06-27T19:00:00027 June 2008 19:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Procedure Change Initiated to Support Tsc Habitability Dose Calculation ENS 443112008-06-23T07:00:00023 June 2008 07:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Emergency Response Capability - Tsc Is Unavailable ENS 442922008-06-12T17:45:00012 June 2008 17:45:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Unavailability of Emergency Operations Facility ENS 441412008-04-14T16:00:00014 April 2008 16:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Siren Alert Notification System Due to System Modifications ENS 441222008-04-07T08:30:0007 April 2008 08:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center May Become Uninhabitable Due to Scheduled Maintenance ENS 439352008-01-25T18:00:00025 January 2008 18:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center May Become Uninhabitable 2014-06-30T11:30:00 | |
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