ENS 42734
ENS Event | |
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01:44 Jun 6, 2006 | |
Title | Invalid Emergency Diesel Generator Start |
Event Description | 'The following event description is based on information currently available. If through subsequent reviews of this event, additional information is identified that is pertinent to this event or alters the information being provided at this time, a follow-up notification will be made via the ENS or under the reporting requirements of 10CFR50.73.
This report is being made under 50.73 (a)(2)(iv)(A). On June 5, 2006, at approximately 1844 Mountain Standard Time (MST), Palo Verde Nuclear Generating Station Unit 1 experienced an invalid 'A' train emergency diesel generator (EDG) start in the emergency mode. The EDG had been stopped at 1835 MST following completion of troubleshooting steps related to the balance of plant engineered safety features actuation system (BOP-ESFAS) sequencer. The start occurred as additional troubleshooting steps progressed. The related 4160 vac class 1E bus, PBA-S03, remained energized by off-site power during the event. The EDG started successfully and remained unloaded until it was stopped at 2014 MST. No other engineered safety feature (ESF) equipment in the 'A' train actuated. (a) The specific train(s) and svstem(s) that were actuated: Unit 1 'A' train EDG started in the emergency mode. (b) Whether each train actuation was complete or partial: Only EDG 'A' started as a single component and remained unloaded until it was stopped. No other ESF equipment actuated or was required. Essential spray pond pump 'A' was already running to provide EDG 'A' cooling water, from the previous EDG run. Bus PBA-S03 remained energized by off-site power throughout the duration of the event. (c) Whether or not the system started and functioned successfully: EDG 'A' started successfully and reached required speed, frequency, and voltage. Loading onto bus PBA-S03 was not required. Operations noted the EDG started with no anomalies. The exact cause of the invalid start was not known at the time of this report. The licensee notified the NRC Resident Inspector. |
Where | |
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Palo Verde Arizona (NRC Region 4) | |
Reporting | |
10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
Time - Person (Reporting Time:+1236.33 h51.514 days <br />7.359 weeks <br />1.694 months <br />) | |
Opened: | Ray Buzard 14:04 Jul 27, 2006 |
NRC Officer: | Mike Ripley |
Last Updated: | Jul 27, 2006 |
42734 - NRC Website
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WEEKMONTHYEARENS 559262022-04-12T03:45:00012 April 2022 03:45:00
[Table view]10 CFR 50.73(a)(1), Submit an LER Invalid System Actuation ENS 550322020-12-11T07:00:00011 December 2020 07:00:00 10 CFR 50.73(a)(1), Submit an LER 60-Day Option Telephonic Notification of an Invalid Specified System Actuation ENS 547012020-03-14T19:44:00014 March 2020 19:44:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of Spray Pond Pump System - 60 Day Reports ENS 524132016-10-17T22:19:00017 October 2016 22:19:00 10 CFR 50.73(a)(1), Submit an LER Invalid Engineered Safety Features Actuation System (Esfas) Signal ENS 522282016-07-12T12:50:00012 July 2016 12:50:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of Both Trains Essential Spray Pond System ENS 498072013-12-12T03:11:00012 December 2013 03:11:00 10 CFR 50.73(a)(1), Submit an LER 60 Day Report for an Invalid Main Steam Line Actuation ENS 486152012-10-26T04:08:00026 October 2012 04:08:00 10 CFR 50.73(a)(1), Submit an LER 60-Day Optional Telephonic Notification for an Invalid Actuation of the Essential Spray Pond System ENS 468982011-04-03T21:44:0003 April 2011 21:44:00 10 CFR 50.73(a)(1), Submit an LER 60-Day Optional Notification of Invalid Start of the 'A' Emergency Diesel Generator ENS 427342006-06-06T01:44:0006 June 2006 01:44:00 10 CFR 50.73(a)(1), Submit an LER Invalid Emergency Diesel Generator Start ENS 418042005-04-29T07:43:00029 April 2005 07:43:00 10 CFR 50.73(a)(1), Submit an LER Invalid System Actuation 2022-04-12T03:45:00 | |