ENS 43898
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ENS Event | |
|---|---|
14:04 Jan 12, 2008 | |
| Title | Valid Specified System Actuation During Edg Governor Testing |
| Event Description | An overvoltage condition occurred on the D23 Safeguards 4kv bus during planned system outage window EDG governor testing. The EDG output breaker was immediately opened and the engine secured per test direction. Due to the output breaker being opened, the D23 bus then experienced an undervoltage condition. Bus voltage monitoring instrumentation automatically initiated automatic closure of the 201-D23 Bus Offsite Supply Feed Breaker after a 1 second time delay and re-energized the D23 Safeguards Bus per design.
The remaining three 4kv buses and Emergency Diesel Generators were unaffected and remain operable. The voltage regulation circuit is being investigated at this time to assist in determining the cause of the overvoltage condition. The EDG was out of service and inoperable during the testing. The EDG governor was replaced during the outage window and was being fine tuned when the event occurred. The licensee is currently in day 6 of a 30 day LCO (3.8.1.1). The licensee notified the NRC Resident Inspector. |
| Where | |
|---|---|
Limerick  Pennsylvania (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(iv)(A), System Actuation | |
| Time - Person (Reporting Time:+5.08 h0.212 days <br />0.0302 weeks <br />0.00696 months <br />) | |
| Opened: | Brandon Shultz 19:09 Jan 12, 2008 |
| NRC Officer: | Joe O'Hara |
| Last Updated: | Jan 12, 2008 |
| 43898 - NRC Website
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Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 511682015-06-21T20:25:00021 June 2015 20:25:00
[Table view]10 CFR 50.72(b)(3)(iv)(A), System Actuation Manual Secondary Containment Isolation ENS 509812015-04-13T06:20:00013 April 2015 06:20:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Manual Reactor Scram Initiated ENS 489362013-04-17T01:42:00017 April 2013 01:42:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Specified System Actuation During Turbine Stop Valve Logic Testing While Shutdown ENS 481212012-07-19T19:37:00019 July 2012 19:37:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Reactor Protection Signal Actuation Due to Changing Mode Switch Position During Surveillance Testing ENS 478882012-05-02T11:24:0002 May 2012 11:24:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Manual Initiation of Secondary Containment Isolation ENS 469062011-05-30T15:50:00030 May 2011 15:50:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Specified System Actuation - Manual Reactor Scram Due to Dual Recirc Pump Trip During Startup ENS 449482009-03-31T22:50:00031 March 2009 22:50:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Valid Diesel Start Signal Received During Maintenance Testing of Diesel ENS 438982008-01-12T14:04:00012 January 2008 14:04:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Valid Specified System Actuation During Edg Governor Testing 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 432312007-03-13T11:30:00013 March 2007 11:30:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Low Main Condenser Vacuum Isolation Signal Received During Plant Shutdown ENS 421932005-12-09T14:01:0009 December 2005 14:01:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Trip of a Startup Bus Breaker Results in Start of Emergency Diesel Generators ENS 415732005-04-06T21:55:0006 April 2005 21:55:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Partial Loss of Offsite Power Resulting in Autostart of Emergency Diesel Generators 2015-06-21T20:25:00 | |
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