ENS 49732
ENS Event | |
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16:00 Nov 17, 2013 | |
Title | 60-Day Report for Invalid System Actuation of Emergency Diesel Generators |
Event Description | The following 60-day report is being made under 10 CFR 50.73(a)(2)(iv)(A) for an invalid actuation of the Unit 2, Division 1 and Division 2, Emergency Diesel Generators (EDG) that occurred on November 17, 2013, at 1000 CST. As allowed by 10 CFR 50.73(a)(1) this notification is being made via telephone.
(a) The specific train(s) and system(s) that were actuated. On November 17th, during the required twenty-two year replacement of the ATWS [anticipated transient without scram] level transmitters, the Unit 2, Division 1 and Division 2, Emergency Diesel Generators (EDG) auto-started as a result of maintenance activities. The failure to remove trip relays, in addition to the sequence for the timing of the replacements, resulted in an unexpected and invalid low water level trip. Subsequently, this resulted in an automatic initiation of the Unit 2, Division 1 and 2, EDGs. (b) Whether each train actuation was complete or partial. Upon receiving the invalid low water level signal, both divisions of EDGs responded as expected for existing plant conditions. Therefore, the actuation was considered a complete actuation of both Division 1 and Division 2 EDGs. (c) Whether or not the system started and functioned successfully. Both Divisions of EDGs auto-started, achieved rated speed, and idled based upon offsite power being available to the safety related busses. Therefore, this is being considered a successful actuation of the Division 1 and Division 2 EDGs. The NRC Resident Inspector has been notified. |
Where | |
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Dresden Illinois (NRC Region 3) | |
Reporting | |
10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
Time - Person (Reporting Time:+1439.83 h59.993 days <br />8.57 weeks <br />1.972 months <br />) | |
Opened: | Kyle Koller 15:50 Jan 16, 2014 |
NRC Officer: | John Shoemaker |
Last Updated: | Jan 16, 2014 |
49732 - NRC Website
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Unit 3 | |
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Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
WEEKMONTHYEARENS 497322013-11-17T16:00:00017 November 2013 16:00:00
[Table view]10 CFR 50.73(a)(1), Submit an LER 60-Day Report for Invalid System Actuation of Emergency Diesel Generators ENS 471182011-06-05T03:43:0005 June 2011 03:43:00 10 CFR 50.73(a)(1), Submit an LER Invalid Signal Caused a Partial Containment System Isolation ENS 455922009-11-06T21:32:0006 November 2009 21:32:00 10 CFR 50.73(a)(1), Submit an LER ENS 452162009-05-25T21:15:00025 May 2009 21:15:00 10 CFR 50.73(a)(1), Submit an LER Optional 60-Day Report of Invalid Specified System Actuation ENS 422012005-11-06T07:19:0006 November 2005 07:19:00 10 CFR 50.73(a)(1), Submit an LER Invalid Containment Isolation Signal Generated ENS 420512005-09-08T15:08:0008 September 2005 15:08:00 10 CFR 50.73(a)(1), Submit an LER Invalid System Actuation ENS 416822005-04-03T11:04:0003 April 2005 11:04:00 10 CFR 50.73(a)(1), Submit an LER Containment Isolation Valve Closure 2013-11-17T16:00:00 | |