ENS 47118
ENS Event | |
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03:43 Jun 5, 2011 | |
Title | Invalid Signal Caused a Partial Containment System Isolation |
Event Description | While preparing to restore AOV 3-1601-22, Drywell /Torus Vent Valve, to operable status following solenoid replacement, operations personnel attempted to open AOV 3-1601-22 in accordance with plant procedures. When the control switch was taken to the open position, the U3 control room received a partial U3 Containment System Isolation. Light indication was lost for several Containment Isolation valves.
Troubleshooting revealed that a control power fuse had blown during the attempt to open AOV 3-1601-22. Operations personnel entered the appropriate Technical Specification and Technical Requirement Manual Required Actions. Operations personnel replaced the blown fuse and indication was restored to the affected valves. Following the fuse replacement, the following containment air sample valves were observed to have repositioned during the event: 3-8501-3B, 3-8501-1B, 3-8501-5B, 3-9205B, 3-9206B, 3-9207B, and 3-9208B. Subsequent troubleshooting revealed that during the AOV solenoid replacement, the conduit cover screw penetrated the tape of an electrical splice and caused a short to ground. The solenoid was repaired and systems were restored as required. During this event, all valves repositioned to their intended safety position. There was no loss of function as a result of this condition. Therefore, the health and safety of the public were not compromised. 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:+1408.15 h58.673 days <br />8.382 weeks <br />1.929 months <br />) | |
Opened: | Jason Solberg 19:52 Aug 2, 2011 |
NRC Officer: | Vince Klco |
Last Updated: | Aug 2, 2011 |
47118 - 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 | |