ENS 42951
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ENS Event | |
|---|---|
11:10 Oct 31, 2006 | |
| Title | Offsite Emergency Sirens Inoperable |
| Event Description | At 0810, Eastern Standard Time, the Harris Nuclear Plant (HNP) determined that the offsite emergency sirens were not capable of being activated. This event requires an 8-hour non-emergency notification per 10CFR 50.72(b)(3)(xiii) due to the loss of a significant portion of the offsite notification system. The NRC Senior Resident Inspector was informed. In the event that the sirens had been needed, the State of North Carolina and all four counties within the 10-mile emergency planning zone would have implemented mobile route alerting, as detailed In the Emergency Plan. Tone Alert Radios for notification of residents within the 5-mile emergency planning zone were also available and operable.
The siren failures began to occur during the regularly scheduled 12-hour test at 0510. The most probable cause was a failed 'B' Repeater which rendered the controller at the microwave tower unable to activate the sirens. The 'B' Repeater was removed from the system and all sirens were operating as designed following a satisfactory system test at 0748. The State of North Carolina and all four counties within the 10-mile emergency planning zone were briefed on this occurrence and notified of system restoration by 1145. The plant continues to troubleshoot to determine the cause of the 'B' Repeater failure. In the interim, HNP is conducting frequent interrogation of the siren system to ensure that the system continues to function correctly. The system is now operating with the 'A' Repeater. The 'B' Repeater will be replaced as a part of the troubleshooting and repair plan. HNP is responding to local media inquiries. See directly related event EN 42948 of 10/30/06 |
| Where | |
|---|---|
Harris  North Carolina (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | |
| Time - Person (Reporting Time:+2.07 h0.0863 days <br />0.0123 weeks <br />0.00284 months <br />) | |
| Opened: | Kelli Voelsing 13:14 Oct 31, 2006 |
| NRC Officer: | Mike Ripley |
| Last Updated: | Oct 31, 2006 |
| 42951 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 556742021-12-22T17:45:00022 December 2021 17:45:00
[Table view]10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Siren System ENS 552132021-04-25T16:00:00025 April 2021 16:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Seismic Monitoring System Out of Service for Planned Maintenance ENS 550172020-12-01T16:16:0001 December 2020 16:16:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Technical Support Center Functionality ENS 547732020-07-10T13:00:00010 July 2020 13:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Planned Common Emergency Operations Facility Maintenance ENS 546512020-04-08T13:45:0008 April 2020 13:45:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Technical Support Center Functionality ENS 533662018-04-26T22:00:00026 April 2018 22:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Emergency Assessment Capability ENS 524182016-12-08T18:30:0008 December 2016 18:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Ventilation System Out of Service Due to Failed Air Intake Fan ENS 522912016-10-08T17:28:0008 October 2016 17:28:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration, 10 CFR 50.72(b)(3)(iv)(A), System Actuation, 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Unusual Event Declared Due to Loss of Offsite Power ENS 521522016-08-04T15:00:0004 August 2016 15:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Ventilation Out-Of-Service ENS 516252015-12-28T21:45:00028 December 2015 21:45:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Emergency Assessment Capability Due to Functionality of Technical Support Center Ventilation ENS 514722015-10-15T19:54:00015 October 2015 19:54:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Ventilation System Out of Service Due to Discovered Condition ENS 512122015-07-07T15:05:0007 July 2015 15:05:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Ventilation Out of Service ENS 511462015-06-10T17:00:00010 June 2015 17:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Temporary Loss of Meteorological Data ENS 504432014-09-10T08:53:00010 September 2014 08:53:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Ventilation System Out of Service Due to Fire Alarm ENS 499942014-04-03T13:06:0003 April 2014 13:06:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Emergency Sirens Declared Nonfunctional ENS 497422014-01-18T15:16:00018 January 2014 15:16:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration, 10 CFR 50.72(b)(3)(iv)(A), System Actuation, 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Alert Declared Due to Fire in 480V Bus ENS 497202014-01-13T15:22:00013 January 2014 15:22:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Emergency Response Facilities Out of Service Due to Planned Maintenance ENS 492702013-08-12T19:50:00012 August 2013 19:50:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center (Tsc) Ventilation Out of Service Due to Discovered Condition ENS 492282013-07-31T09:10:00031 July 2013 09:10:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Emergency Response Facility Preplanned Maintenance ENS 491502013-06-27T08:25:00027 June 2013 08:25:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Ventilation Planned Maintenance ENS 490042013-05-06T14:16:0006 May 2013 14:16:00 Other Unspec Reqmnt, 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness One of Two National Weather Service Tone Alert Radios Out of Service ENS 489282013-04-16T08:14:00016 April 2013 08:14:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center (Tsc) Unavailable Due to Preplanned Maintenance ENS 489152013-04-11T19:41:00011 April 2013 19:41:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Coolers Out of Service ENS 488402013-03-21T09:07:00021 March 2013 09:07:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Radiation Monitors Inoperable for Pre-Planned Maintenance ENS 488042013-03-04T09:15:0004 March 2013 09:15:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Radiation Monitor Inoperable for Pre-Planned Maintenance ENS 487792013-02-25T13:04:00025 February 2013 13:04:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Assessment Capability - Radiation Monitors Inoperable for Pre-Planned Maintenance ENS 486862013-01-21T18:00:00021 January 2013 18:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Response Capability - Technical Support Center Ah-17 Supply Fan Non-Functional for Preplanned Maintenance ENS 486842013-01-20T21:41:00020 January 2013 21:41:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Ventilation Disabled ENS 486702013-01-14T13:40:00014 January 2013 13:40:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Assessment Capability - Radiation Monitors Inoperable for Pre-Planned Maintenance ENS 486112012-12-20T12:35:00020 December 2012 12:35:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Assessment Capability - Radiation Monitors Inoperable for Pre- Planned Maintenance ENS 485972012-12-15T12:34:00015 December 2012 12:34:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Cooling Fan Inoperable ENS 485882012-12-13T16:00:00013 December 2012 16:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Seismic Monitoring System Inoperable for Pre-Planned Maintenance ENS 485732012-12-10T12:30:00010 December 2012 12:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Assessment Capability- Radiation Monitors Inoperable for Pre-Planned Maintenance ENS 485632012-12-06T12:00:0006 December 2012 12:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Radiation Monitor Inoperable for Pre-Planned Maintenance ENS 485592012-12-05T13:47:0005 December 2012 13:47:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Ventilation Removed from Service for Maintenance ENS 485382012-11-27T14:00:00027 November 2012 14:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Assessment Capability- Radiation Monitor Inoperable Due to Database Error ENS 485362012-11-26T15:29:00026 November 2012 15:29:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Assessment Capability- Radiation Monitor Inoperable for Pre-Planned Maintenance ENS 485242012-11-20T09:34:00020 November 2012 09:34:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Assessment Capability - Radiation Monitor Declared Inoperable ENS 485072012-11-14T15:00:00014 November 2012 15:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Assessment Capability - Gross Failed Fuel Detector ENS 484402012-10-24T19:30:00024 October 2012 19:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Ventilation Support System Non-Functional ENS 484082012-10-16T12:00:00016 October 2012 12:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Planned Technical Support Center (Tsc) Maintenance ENS 483992012-10-11T18:28:00011 October 2012 18:28:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Out of Service Due to Maintenance ENS 483812012-10-05T12:00:0005 October 2012 12:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Emergency Response Facility Information System Due to Planned Modification ENS 483732012-10-04T12:02:0004 October 2012 12:02:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Ventilation System Repairs ENS 482502012-08-29T12:27:00029 August 2012 12:27:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Emergency Assessment Capability Due to Limited Range on Indicator ENS 481492012-08-01T16:12:0001 August 2012 16:12:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Tsc Inoperable Due to Non-Functional Ventilation Support System ENS 481272012-07-24T09:55:00024 July 2012 09:55:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Out of Service ENS 478942012-05-03T12:30:0003 May 2012 12:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Preplanned Maintenance on Tsc Ventilation System ENS 478552012-04-19T21:24:00019 April 2012 21:24:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Tsc Ventilation Inoperable ENS 478432012-04-17T13:00:00017 April 2012 13:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Had Only One Power Source During Preplanned Maintenance ENS 478402012-04-16T13:32:00016 April 2012 13:32:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Unavailability of Technical Support Center Radiation Monitor ENS 478382012-04-16T12:00:00016 April 2012 12:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Planned Maintenance on the Technical Support Center Normal Power Supply ENS 477752012-03-27T04:00:00027 March 2012 04:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Historical Unavailability of Emergency Operations Facility Ventilation Due to Maintenance ENS 477402012-03-14T12:00:00014 March 2012 12:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Planned Maintenance ENS 477362012-03-13T12:00:00013 March 2012 12:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Emergency Operations Facility Planned Maintenance ENS 477292012-03-09T19:00:0009 March 2012 19:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Failure of a Technical Support Center Air Handling Unit ENS 476552012-02-09T22:00:0009 February 2012 22:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Potential Degradation of Technical Support Center Habitability ENS 479732011-09-21T15:22:00021 September 2011 15:22:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Ventilation System Inoperable ENS 471392011-08-10T11:30:00010 August 2011 11:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Emergency Sirens Out of Service Due to a Communication Problem ENS 439842008-01-30T10:13:00030 January 2008 10:13:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of All 81 Offsite Sirens for Approximately 80 Minutes ENS 439062008-01-15T18:30:00015 January 2008 18:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Damaged Fiber Optic Cable Affected Communications ENS 438652007-12-24T16:00:00024 December 2007 16:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Telecommunications Capability Due to Damaged Fiber Optic Cable ENS 436172007-09-06T17:12:0006 September 2007 17:12:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Communication to Harnett County Due to Damaged Phone Lines ENS 429512006-10-31T11:10:00031 October 2006 11:10:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Offsite Emergency Sirens Inoperable ENS 429482006-10-30T12:21:00030 October 2006 12:21:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Offsite Emergency Sirens Inoperable ENS 426312006-06-12T02:56:00012 June 2006 02:56:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of 20% of Offsite Emergency Sirens Due to Severe Weather ENS 416712005-05-06T08:15:0006 May 2005 08:15:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Communication ENS 401702003-09-18T18:33:00018 September 2003 18:33:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of More than 20% of Offsite Emergency Sirens 2021-04-25T16:00:00 | |
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