ENS 48117
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ENS Event | |
|---|---|
12:15 Jul 18, 2012 | |
| Title | Unusual Event Declared Due to Flashover in the Load Center Transformer Cabinet |
| Event Description | An electrical transformer fault occurred resulting in a loss of both Recirc Pumps. The reactor was manually scrammed from 100% power as required by Plant Procedure OT-112.
The electrical transformer was walked down by Operations supervisor. Licensee's assessment was that a flashover occurred, and was confined to the load center transformer cabinet. Based on observed damage, EAL declaration of HU3 was made. HU3 is identified as an explosion within the Protected Area. The licensee has notified the NRC Resident Inspector. Licensee also notified state, local and other government agencies. Notified other agencies (DHS SWO, FEMA, DHS NICC)
Limerick, Unit 1 is terminating from their Unusual Event (HU3) due to the initiating event and conditions no longer being present. The 124A Fault was isolated by the trip of the designed protection features (feeder breaker trip). A walkdown of the area/equipment was completed with no adverse conditions noted. Normal plant shutdown activities are in progress. The area/equipment is quarantined for investigation. The licensee will be issuing a press release. Notified other agencies (DHS SWO, FEMA, DHS NICC) The licensee has notified the NRC Resident Inspector. Notified R1DO (Dimitriadis) and NRR EO (Davis) |
| Where | |
|---|---|
Limerick  Pennsylvania (NRC Region 1) | |
| Reporting | |
| Emergency class: | Unusual Event |
| 10 CFR 50.72(a) (1) (i), Emergency Class Declaration 10 CFR 50.72(b)(2)(iv)(B), RPS Actuation | |
| LER: | 05000352/LER-2012-005 |
| Time - Person (Reporting Time:+-2.7 h-0.113 days <br />-0.0161 weeks <br />-0.0037 months <br />) | |
| Opened: | Brian Devine 09:33 Jul 18, 2012 |
| NRC Officer: | John Knoke |
| Last Updated: | Jul 18, 2012 |
| 48117 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | Yes, Manual Scram |
| Before | Power Operation (100 %) |
| After | Hot Shutdown (0 %) |
Limerick with 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration | |
WEEKMONTHYEARENS 549962020-11-13T07:45:00013 November 2020 07:45:00
[Table view]10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Automatic Reactor Scram Due to High Reactor Pressure Signal ENS 540982019-06-04T05:45:0004 June 2019 05:45:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Manual Scram During Rapid Plant Shutdown ENS 519682016-06-01T13:00:0001 June 2016 13:00:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Manual Reactor Scram Due to Unexpected Core Flow Change ENS 516142015-12-19T12:02:00019 December 2015 12:02:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Automatic Reactor Scram Due to Low Reactor Water Level ENS 509562015-04-05T19:37:0005 April 2015 19:37:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Alert Declared Due to Fire in Motor Control Center ENS 508472015-02-24T02:40:00024 February 2015 02:40:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Automatic Reactor Scram on Reactor High Pressure Signal ENS 498712014-03-05T04:34:0005 March 2014 04:34:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Unit 1 Manually Scrammed During a Rapid Shutdown in Response to a Turbine Ehc Failure ENS 481172012-07-18T12:15:00018 July 2012 12:15:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Declared Due to Flashover in the Load Center Transformer Cabinet 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 473032011-09-29T15:35:00029 September 2011 15:35:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Notification of Unusual Event Declared Due to Chemical Spill ENS 471852011-08-23T18:15:00023 August 2011 18:15:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Notification of an Unusual Event Due to a Seismic Event ENS 469192011-06-03T14:21:0003 June 2011 14:21:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Automatic Scram Following a Turbine Trip ENS 469032011-05-29T09:02:00029 May 2011 09:02:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Automatic Reactor Trip Due to Low Pressure in Ehc System ENS 466412011-02-25T14:10:00025 February 2011 14:10:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Manual Scram Due to Recirculation Pump Trip ENS 460422010-06-24T00:51:00024 June 2010 00:51:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Manual Reactor Scram Following Loss of Both Recirculation Pumps ENS 440882008-03-22T23:39:00022 March 2008 23:39:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Turbine Trip Resulting in a Reactor Scram ENS 439492008-02-01T09:45:0001 February 2008 09:45:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Automatic Scram as a Result of Turbine Trip ENS 433152007-04-24T06:10:00024 April 2007 06:10:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation, 10 CFR 50.72(b)(2)(iv)(A), System Actuation - ECCS Discharge Automatic Reactor Scram with Eccs Injection on Lowering Reactor Vessel Water Level ENS 420542005-10-13T02:24:00013 October 2005 02:24:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Automatic Scram Due to Reactor High Pressure Signal ENS 418482005-07-18T13:52:00018 July 2005 13:52:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Automatic Reactor Scram ENS 408322004-06-22T17:13:00022 June 2004 17:13:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Automatic Reactor Scram Following an Electrical Yard Manipulation ENS 404442004-01-14T00:21:00014 January 2004 00:21:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Declared Due to Explosion within Protected Area Boundary 2020-11-13T07:45:00 | |
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