ENS 44948
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ENS Event | |
|---|---|
22:50 Mar 31, 2009 | |
| Title | Valid Diesel Start Signal Received During Maintenance Testing of Diesel |
| Event Description | A valid actuation of the D23 Emergency Diesel Generator bus undervoltage minimum actuation logic occurred following manual operator action to mitigate a bus overvoltage condition during emergency diesel generator post maintenance testing . Due to the output breaker being opened, the D23 EDG experienced a undervoltage start signal. EDG undervoltage actuation instrumentation actuated, however, the EDG was in PTL (Pull-to-Lock) EDG shutdown. The event was caused by a failure of the emergency diesel generator voltage regulator most likely due to an intermittent failure of the #1 rectifier bank.
The licensee stated that the D23 EDG was powering an isolated safety related bus for a post-maintenance test when the overvoltage condition occurred. The operator opened the EDG output breaker and placed the EDG in PTL. With the bus de-energized, a valid start signal was sent to EDG D23. However, EDG D23 did not actually start because it was in PTL. No safety related equipment was lost when the bus was de-energized because the bus had been unloaded prior to the test. The licensee has 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:+1.33 h0.0554 days <br />0.00792 weeks <br />0.00182 months <br />) | |
| Opened: | Nora Graneto 00:10 Apr 1, 2009 |
| NRC Officer: | Bill Huffman |
| Last Updated: | Apr 1, 2009 |
| 44948 - NRC Website
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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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