ENS 51093
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ENS Event | |
|---|---|
14:52 May 27, 2015 | |
| Title | |
| Event Description | On May 27, 2015, at 0952 CDT, the Control Room Emergency Ventilation (CREV) system was declared inoperable due to opening a ventilation duct hatch to facilitate fire damper inspection without administrative controls. The hatch was opened and upon discovery was immediately shut, re-establishing the boundary of the Control Room Envelope. As a result, Technical Specification 3.7.4, Condition C, was entered and subsequently exited.
The CREV system maintains a habitable control room environment and ensures the operability of components in the control room emergency zone during accident conditions as well as protection of the operators from a high dose environment assumed during a design basis accident. This notification is being made in accordance with 10 CFR 50.72(b)(3)(v)(D) because the CREV system is a single train system, and loss of the CREV system could impact the plant's ability to mitigate the consequences of an accident as stated in Chapter 6 of the UFSAR. This event is also reportable under 10 CFR 50.72(b)(3)(xiii) since this condition also impacts the control room as an Emergency Response Facility. At 0955, Technical Specification 3.7.4, Condition C, for CREV System Inoperable due to inoperable Control Room Envelope was exited. The NRC Resident Inspector has been notified. |
| Where | |
|---|---|
Quad Cities  Illinois (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | |
| LER: | 05000254/LER-2015-007 Regarding Loss of Main Control Room Envelope Boundary Due to Damper Inspection |
| Time - Person (Reporting Time:+3.75 h0.156 days <br />0.0223 weeks <br />0.00514 months <br />) | |
| Opened: | Fred Muhly 18:37 May 27, 2015 |
| NRC Officer: | Steven Vitto |
| Last Updated: | May 27, 2015 |
| 51093 - 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 %) |
Quad Cities with 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | ||
WEEKMONTHYEARENS 579052025-09-05T06:30:0005 September 2025 06:30:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident High Pressure Coolant Injection Inoperable ENS 576472025-04-05T09:00:0005 April 2025 09:00:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Both Trains of Reactor Building to Suppression Chamber Vacuum Breakers Inoperable ENS 575152025-01-26T20:50:00026 January 2025 20:50:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Control Room Emergency Ventilation Air Conditioning System Inoperable ENS 563572023-02-06T11:30:0006 February 2023 11:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Communications and Assessment Capabilities ENS 559762022-07-04T06:30:0004 July 2022 06:30:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Both Trains of Standby Gas Treatment Inoperable ENS 556192021-12-02T00:47:0002 December 2021 00:47:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Unit 1 HPCI Inoperable ENS 549232020-07-22T15:30:00022 July 2020 15:30:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | Oprm Count Setpoint Discrepancy ENS 546662020-04-14T21:45:00014 April 2020 21:45:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Control Room Emergency Ventilation System Inoperable ENS 545942020-03-20T15:25:00020 March 2020 15:25:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Low Pressure Coolant Injection Unplanned Inoperability ENS 543552019-10-27T21:05:00027 October 2019 21:05:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Water Found in Control Room Emergency Ventilation Air Filtration Unit ENS 538612019-02-06T00:04:0006 February 2019 00:04:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Unit One Hpci System Inoperable Due to Blown Fuse ENS 536572018-10-09T05:00:0009 October 2018 05:00:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Control Room Emergency Ventilation Ac System Inoperable ENS 532352018-03-01T18:10:0001 March 2018 18:10:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition En Revision Imported Date 11/8/2019 ENS 530892017-11-23T02:43:00023 November 2017 02:43:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Lpci Inoperability Due to Overvoltage Relay Actuation ENS 530592017-11-08T00:10:0008 November 2017 00:10:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Unit 1 High Pressure Coolant Injection Inoperable ENS 529842017-09-21T22:30:00021 September 2017 22:30:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Control Room Emergency Ventilation Ac System Inoperable ENS 529552017-09-08T16:30:0008 September 2017 16:30:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Hpci System Inoperable ENS 527582017-05-16T00:18:00016 May 2017 00:18:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident High Pressure Coolant Injection System Declared Inoperable ENS 523342016-10-31T07:39:00031 October 2016 07:39:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident High Pressure Coolant Injection (Hpci) Inoperable ENS 521272016-07-26T17:52:00026 July 2016 17:52:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Control Room Emergency Ventilation System Inoperable ENS 520992016-07-18T19:50:00018 July 2016 19:50:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Offsite Communications Capability ENS 518802016-04-25T11:07:00025 April 2016 11:07:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident High Pressure Coolant Injection System Declared Inoperable ENS 515892015-12-07T14:25:0007 December 2015 14:25:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Control Room Emergency Ventilation System Inoperable ENS 515022015-10-27T15:30:00027 October 2015 15:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Tsc Air Filtration System Degraded ENS 513642015-09-03T02:00:0003 September 2015 02:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Planned Technical Support Center (Tsc) Maintenance ENS 512722015-07-27T22:30:00027 July 2015 22:30:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Control Room Emergency Ventilation System Inoperable ENS 510932015-05-27T14:52:00027 May 2015 14:52:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Control Room Emergency Ventilation System Inoperable ENS 509282015-03-26T18:30:00026 March 2015 18:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Seismograph Not Available for Emergency Plan Assessment ENS 507302015-01-12T11:00:00012 January 2015 11:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Planned Maintenance on Radiological Monitor ENS 507082014-12-30T14:16:00030 December 2014 14:16:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Planned Technical Support Center Maintenance Affecting the Air Handling System ENS 506782014-12-15T13:30:00015 December 2014 13:30:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Control Room Emergency Ventilation System Inoperable ENS 505932014-11-04T17:00:0004 November 2014 17:00:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Unit 2 High Pressure Coolant Injection (Hpci) Inoperable ENS 504272014-09-05T00:05:0005 September 2014 00:05:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Control Room Emergency Ventilation (Crev) System Inoperable ENS 494072013-10-04T01:45:0004 October 2013 01:45:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Unit 2 High Pressure Coolant Injection (Hpci) Inoperable Due to Drain Line Leak ENS 491352013-06-19T15:15:00019 June 2013 15:15:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Planned Maintenance ENS 489162013-04-11T18:00:00011 April 2013 18:00:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Degraded Electrical Connections ENS 484062012-10-15T13:00:00015 October 2012 13:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Planned Technical Support Center (Tsc) Maintenance ENS 481142012-07-17T16:20:00017 July 2012 16:20:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Control Room Emergency Ventilation Ac System Inoperable ENS 481082012-07-15T15:30:00015 July 2012 15:30:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Unit 1 High Pressure Coolant Injection (Hpci) Inoperable Due to Valve Leak ENS 477992012-04-02T19:52:0002 April 2012 19:52:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Initiation of Reactor Shutdown Required by Technical Specifications (Ts) 3.8.1.F ENS 476342012-02-03T16:35:0003 February 2012 16:35:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident ENS 471052011-07-28T06:15:00028 July 2011 06:15:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Control Room Temperature Recorder Inoperable ENS 470302011-07-06T19:10:0006 July 2011 19:10:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Control Room Emergency Ventilation Ac System Inoperable ENS 468232011-05-05T15:35:0005 May 2011 15:35:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center (Tsc) Ventilation System Degraded ENS 467692011-04-19T19:30:00019 April 2011 19:30:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Both Divisions of Residual Heat Removal Inoperable ENS 465352011-01-12T16:20:00012 January 2011 16:20:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Loss of Unit 2 Essential Service 480V Bus ENS 462022010-08-24T14:22:00024 August 2010 14:22:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Offsite Communications ENS 457712010-03-17T16:30:00017 March 2010 16:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Erds and Spds Out of Service Due to Process Computer Upgrade ENS 455872009-12-23T12:56:00023 December 2009 12:56:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Winter Storm Power Outages Cause Alert Siren Inoperability ENS 455552009-12-09T17:17:0009 December 2009 17:17:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Winter Storm Power Outages Cause Alert Siren Inoperability ENS 454882009-11-11T18:38:00011 November 2009 18:38:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Degraded Tsc Emergency Ventilation ENS 452852009-08-24T07:40:00024 August 2009 07:40:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Tsc Air Filtration System Inoperable Due to Planned Maintenance ENS 451462009-06-21T08:08:00021 June 2009 08:08:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Unit 2 Emergency Response Data System (Erds) Due to a Plant Process Computer Issue ENS 450802009-05-19T14:00:00019 May 2009 14:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Emergency Response Data System (Erds) Due to Network Service Not Functioning ENS 450282009-04-28T23:34:00028 April 2009 23:34:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Process Computer Replacement Impacting Erds and Spds ENS 437932007-11-20T11:05:00020 November 2007 11:05:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Control Room Emergency Ventilation System Inoperable ENS 431842007-02-25T01:20:00025 February 2007 01:20:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Reduction in Emergency Preparedness Capability ENS 431772007-02-20T23:20:00020 February 2007 23:20:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Hpci Declared Inoperable Due to an Apparent Equipment Malfunction ENS 431242007-01-26T15:15:00026 January 2007 15:15:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Control Room Emergency Ventilation Air Conditioning (Crev Ac) System Declared Inoperable ENS 421792005-11-30T21:00:00030 November 2005 21:00:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Control Room Emergency Ventilation Ac System Inoperable ENS 418012005-06-27T16:50:00027 June 2005 16:50:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Minimum Switchyard Voltage Requirements Not Met ENS 417662005-06-11T18:10:00011 June 2005 18:10:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Minimum Switchyard Voltage Requirements Not Met ENS 416522005-04-29T12:32:00029 April 2005 12:32:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Minimum Switchyard Voltage Requirements Not Met ENS 415872005-04-11T18:40:00011 April 2005 18:40:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Minimum Switchyard Voltage Requirements Not Met ENS 415622005-04-04T22:07:0004 April 2005 22:07:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Minimum Switchyard Voltage Requirements Not Met ENS 415312005-03-28T01:30:00028 March 2005 01:30:00 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat, 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Electrical Safety Bus Trip During Quad Cities Unit 1 Refueling Outage ENS 415242005-03-24T15:30:00024 March 2005 15:30:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Minimum Switchyard Voltage Requirements Not Met ENS 412252004-11-25T21:45:00025 November 2004 21:45:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Safety Parameter Display System ENS 411392004-10-19T23:30:00019 October 2004 23:30:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident High Pressure Coolant Injection (Hpci) Inoperable Due to Controller Signal Converter Trouble. ENS 411062004-10-09T02:20:0009 October 2004 02:20:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Contol Room Emergency Ventilation System Declared Inoperable ENS 409122004-07-31T02:25:00031 July 2004 02:25:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Lpci Loop Select Logic Found Degraded Due to Pressure Instruments Out-Of-Tolerance 2025-09-05T06:30:00 [Table view] | |
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