ENS 52862
ENS Event | |
|---|---|
16:15 May 18, 2017 | |
| Title | Invalid Actuation of Emergency Diesel Generator |
| Event Description | The following information is provided as a 60-day telephone notification to the NRC in accordance with 10 CFR 50.73(a)(1) reported under 10 CFR 50.73(a)(2)(iv)(A) for an invalid actuation of the Division 3 emergency diesel generator (DG). The event occurred on May 18, 2017, at 1115 CDT. As allowed by 10 CFR 50.73(a)(1), the notification is being made via telephone.
(a) The specific train(s) and system(s) that actuated were: During troubleshooting of blown fuses for the Reserve Auxiliary Transformer (RAT) main feed metering and relaying circuit, the Division 3 DG automatically started as a result of a loss of power signal, the RAT feed breaker for the offsite power source opened after a 15 second time delay as a result of a degraded voltage signal, and the DG output breaker subsequently closed. The loss of voltage and degraded voltage signals were generated when maintenance technicians opened the wrong test switch in the Division 3 4160-Volt Switchgear 1E22S004. (b) Whether each train actuation was complete or partial: Upon receiving the simulated loss of voltage and degraded voltage signals, the Division 3 DG started and the DG breaker closed as expected. No additional actuations occurred. (c) Whether or not the system started and functioned successfully: Upon receiving the simulated loss of voltage and degraded voltage signals, the Division 3 DG and the DG breaker were verified to have properly functioned in response to the invalid signals. The NRC Resident Inspector has been notified. |
| Where | |
|---|---|
Clinton  Illinois (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
| Time - Person (Reporting Time:+1434.67 h59.778 days <br />8.54 weeks <br />1.965 months <br />) | |
| Opened: | Richard Kiss 10:55 Jul 17, 2017 |
| NRC Officer: | Steven Vitto |
| Last Updated: | Jul 17, 2017 |
| 52862 - NRC Website
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WEEKMONTHYEARENS 528622017-05-18T16:15:00018 May 2017 16:15:00
[Table view]10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of Emergency Diesel Generator ENS 512082015-05-11T06:19:00011 May 2015 06:19:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of the Division 2 Emergency Diesel Generator ENS 504522014-07-26T21:48:00026 July 2014 21:48:00 10 CFR 50.73(a)(1), Submit an LER Invalid Specified System Actuation ENS 475872011-12-04T12:09:0004 December 2011 12:09:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of Containment Isolation Signals and an Emergency Service Water Pump ENS 459012010-03-15T06:38:00015 March 2010 06:38:00 10 CFR 50.73(a)(1), Submit an LER Optional 60-Day Report of Invalid Specified System Actuation ENS 425952006-03-26T08:47:00026 March 2006 08:47:00 10 CFR 50.73(a)(1), Submit an LER 60 Day Notification - Invalid Actuation of High Pressure Core Spray Pump ENS 424772006-02-08T03:59:0008 February 2006 03:59:00 10 CFR 50.73(a)(1), Submit an LER Invalid System Actuations ENS 418212005-05-12T20:48:00012 May 2005 20:48:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of the Division 2 Shutdown Service Water (Sx) System Pump. 2017-05-18T16:15:00 | |