ENS 45901
ENS Event | |
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06:38 Mar 15, 2010 | |
Title | Optional 60-Day Report of Invalid Specified System Actuation |
Event Description | This telephone notification is being provided in accordance with 10CFR50.73(a)(1) for an invalid actuation reportable under 50.73 (a)(2) (iv)(A).
On March 15, 2010 at 0138 hours0.0016 days <br />0.0383 hours <br />2.281746e-4 weeks <br />5.2509e-5 months <br />, during full power operations, Division 2 Drywell Ventilation (VP) and Drywell Cooling (WO) Primary Containment Isolation Valves (PCIVs) closed for isolation Groups 11 and 17. The affected valves were inboard PCIVs 1VP005A, 1VP005B, 1VP014A, 1VP014B, 1WO001B, 1W0002B, 1WO551B and1WO552B. The shunt trip devices for the breakers for the following components were tripped: Drywell cooling fan 1B (1VP01CB), Drywell cooling fan 1D (1VP01CD), Drywell chiller 18 oil pump, DC Motor Control Center (MCC) 1B ground detection, DC MCC 1B ground detection, Drywell Chiller 1B(1VP04CB), and Drywell Chiller control panel 1B. The cause of the isolation was determined to be that a Division 2 load driver card spuriously actuated all of its loads without a valid Loss Of Coolant Accident (LOCA) signal or a manual initiation signal present. A reset of the Group 11 and 17 isolations was completed at 0208; the shunt trips were reset at 0215; and Drywell Cooling was restored by 0259 on March 15. The load driver circuit remained in service until a replacement load driver card could be installed on March 19, 2010. The cause of the card failure could not be determined; however the most probable cause is either an intermittent failure of the card or an intermittent short of the output connectors. The actuation of primary containment isolation Groups 11 and 17 was complete and the isolation/actuation was limited to only these two groups. The NRC Resident Inspector was notified of this notification. |
Where | |
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Clinton Illinois (NRC Region 3) | |
Reporting | |
10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
LER: | 05000461/LER-2010-003 |
Time - Person (Reporting Time:+1231.43 h51.31 days <br />7.33 weeks <br />1.687 months <br />) | |
Opened: | Jim Peterson 14:04 May 5, 2010 |
NRC Officer: | Eric Simpson |
Last Updated: | May 5, 2010 |
45901 - NRC Website
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Unit 1 | |
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Reactor critical | Critical |
Scram | No |
Before | Power Operation (96 %) |
After | Power Operation (96 %) |
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 | |