ENS 50951
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ENS Event | |
|---|---|
14:00 Apr 3, 2015 | |
| Title | Inoperable Seismic Instrumentation Identified During Historical Review |
| Event Description | Limerick Generating Station (LGS) has completed a review of recent seismic monitor performance. The seismic monitor is currently capable of fulfilling its emergency assessment support function. The review of the system performance over the last three years identified two occasions when the system was degraded and incapable of performing its emergency assessment support function such that emergency classification at the UNUSUAL EVENT and ALERT levels could not be declared within fifteen minutes as required with site instrumentation. The seismic monitor was determined to be degraded and incapable of performing its emergency assessment support function on the following dates:
1) January 17, 2014 - Unit 1 100% power, Unit 2 97% power 2) March 22, 2014 - Unit 1 Refueling, Unit 2 100% power These unplanned inoperable conditions of the seismic monitor were entered into the LGS Corrective Action Program (CAP) when they occurred. While Exelon procedural direction allowed the use of offsite sources to obtain seismic data when the seismic monitor is incapable of assessing emergency plan Emergency Action Levels (EALs), this was not explicitly referenced in the approved EALs. The loss of assessment capability is reportable to the NRC within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> of discovery in accordance with 10 CFR 50.72(b)(3)(xiii). This report is required per 10 CFR 50.72(a)(1)(ii) as an event that occurred within 3 years of the date of discovery. For the two dates above, the 1/17/14 failure was related to function of the system CPU (central processing unit) and the 3/22/14 failure was due to a failed instrument backup battery. There was no seismic event on either of these two dates. The licensee informed the NRC Resident Inspector. |
| Where | |
|---|---|
Limerick  Pennsylvania (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | |
| Time - Person (Reporting Time:+-2.1 h-0.0875 days <br />-0.0125 weeks <br />-0.00288 months <br />) | |
| Opened: | John Harkins 11:54 Apr 3, 2015 |
| NRC Officer: | Steve Sandin |
| Last Updated: | Apr 3, 2015 |
| 50951 - 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 (82 %) |
| After | Power Operation (82 %) |
WEEKMONTHYEARENS 563602023-02-06T11:30:0006 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 522702016-09-29T21:00:00029 September 2016 21:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Tsc Ventilation Indication Issue Identified Following Surveillance Testing ENS 521012016-07-18T20:00:00018 July 2016 20:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Offsite Communications Capability ENS 509512015-04-03T14:00:0003 April 2015 14:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Inoperable Seismic Instrumentation Identified During Historical Review ENS 503762014-08-17T08:00:00017 August 2014 08:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Emergency Ventilation System Inoperable ENS 498422014-02-19T15:19:00019 February 2014 15:19:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Emergency Ventilation Failure ENS 492752013-08-13T20:00:00013 August 2013 20:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Planned Maintenance on Technical Support Center Ventilation System Power Supply ENS 486532013-01-07T01:00:0007 January 2013 01:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Planned Corrective Maintenance on the Technical Support Center (Tsc) Hvac Power Supply ENS 486292012-12-28T08:30:00028 December 2012 08:30:00 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 Communications with All Emergency Planning Zone Sirens ENS 480412012-06-21T12:00:00021 June 2012 12:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Planned Maintenance on the Technical Support Center Ventilation ENS 480012012-06-07T13:47:0007 June 2012 13:47:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Ventilation System Maintenance ENS 478502012-04-19T11:53:00019 April 2012 11:53:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Manual Reactor Scram Following Loss of Recirculation Pumps ENS 477542012-03-19T17:00:00019 March 2012 17:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Ventilation Out of Service ENS 473892011-10-29T19:15:00029 October 2011 19:15:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Greater than 25% of Epz Sirens Due to Weather ENS 469732011-06-20T15:56:00020 June 2011 15:56:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Charcoal Failed Testing for Methyl Iodine ENS 464262010-11-18T08:00:00018 November 2010 08:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Planned Technical Support Center Ventilation Corrective Maintenance ENS 463302010-10-14T05:00:00014 October 2010 05:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Emergency Ventilation System Scheduled Maintenance ENS 462902010-09-29T19:25:00029 September 2010 19:25:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Hvac Emergency Damper Failed Quarterly Test ENS 460052010-06-14T07:00:00014 June 2010 07:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Planned Maintenance on Tsc Emergency Ventilation System ENS 456932010-02-11T13:00:00011 February 2010 13:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Emergency Ventilation System Maintenance ENS 451532009-06-24T00:30:00024 June 2009 00:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Partial Loss of the Emergency Response Data System (Erds) ENS 451332009-06-16T04:31:00016 June 2009 04:31:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Emergency Response Data System (Erds) Out of Service Due to Computer Problems ENS 442832008-06-11T02:55:00011 June 2008 02:55:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness 54 of 165 Emergency Sirens Inoperable Due to Power Outage ENS 441692008-04-25T21:30:00025 April 2008 21:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Emergency Response Data System Outage ENS 439912008-02-17T14:00:00017 February 2008 14:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Planned Phone Outage ENS 434552007-06-28T13:55:00028 June 2007 13:55:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Greater than 25% of the Epz Sirens for Greater than 1 Hour ENS 427152006-07-19T02:00:00019 July 2006 02:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Emergency Siren Capability Due to Adverse Weather ENS 403292003-11-18T09:35:00018 November 2003 09:35:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Communications Capability ENS 401762003-09-19T08:00:00019 September 2003 08:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Emergency Siren Capability Due to Adverse Weather Conditions 2023-02-06T11:30:00 | |
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