ENS 45592
ENS Event | |
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21:32 Nov 6, 2009 | |
Title | |
Event Description | INVALID START OF THE UNIT 2/3 EMERGENCY DIESEL GENERATOR
On November 6, 2009, at approximately 1532 CST, Dresden Unit 3 manually tripped the main turbine due to an Electro-Hydraulic [Control] Fluid leak. Following the turbine trip, electrical busses automatically realigned breakers which transferred power from the unit auxiliary transformer to the reserve auxiliary transformer. During this transfer, the Unit 2/3 Emergency Diesel Generator (EDG) automatically started. The power source transfer occurred as designed within 0.2 seconds. None of the electrical busses experienced an under-voltage condition. Therefore, the [Unit] 2/3 EDG start signal was invalid. However, the Unit 2/3 EDG started due to a 4 Kv bus breaker interlock. Both the main feed breaker and the reserve feed breaker were open concurrently for approximately 73 milliseconds, which resulted in the invalid Unit 2/3 EDG start signal. Following the start, the Unit 2/3 EDG operated as expected and no abnormalities were observed. Since there was no under-voltage signal experienced, the EDG output breaker did not attempt to close onto the associated bus. The breakers associated with the EDG interlock are scheduled to be inspected during the next refuel outage to verify proper EDG interlock interface. Since this ESF actuation was caused by an invalid signal, it is being reported pursuant to 10 CFR 50.73(a)(2)(iv)(A) as specified by 10 CFR 50.73(a)(1), which allows a telephone notification in lieu of a written licensee event report within 60 days. The licensee notified the NRC Resident Inspector. |
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:+1239.05 h51.627 days <br />7.375 weeks <br />1.697 months <br />) | |
Opened: | Riley Ruffin 12:35 Dec 28, 2009 |
NRC Officer: | Charles Teal |
Last Updated: | Dec 28, 2009 |
45592 - NRC Website
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Unit 3 | |
---|---|
Reactor critical | Critical |
Scram | No |
Before | Power Operation (22 %) |
After | Power Operation (22 %) |
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 | |