ENS 44211
ENS Event | |
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11:25 Apr 3, 2008 | |
Title | Invalid Actuation of a Sbgt During Annunciator Test |
Event Description | Monticello Nuclear Generating Plant is making a telephone report in accordance with 10 CFR 50.73(a)(2)(iv)(A) Invalid Partial Actuation of the Standby Gas Treatment and Secondary Containment Isolation Systems due to an inappropriate operator action. This report is being made in lieu of a written Licensee Event Report.
At 0825 on 04/03/2008, an operator was performing an annunciator test of the Control Room panels and inappropriately pushed the 'A' Standby Gas Treatment system 'Test' pushbutton instead of the 'Lamp Test' pushbutton. He then immediately pushed the 'Reset' pushbutton which reset the Standby Gas Treatment train. The inappropriate actuation of the 'A' Standby Gas Treatment System resulted in the 'A' train momentarily starting, causing ventilation fans V-EF-10 and V-MZ-6 to trip. The immediate resetting of the system by depressing the 'Reset' pushbutton prevented a full secondary containment isolation. All systems started and functioned successfully. The cause of the invalid signal was the operator actuating the system by depressing the 'Test' pushbutton instead of the 'Lamp Test' pushbutton. The NRC Resident Inspector was notified of this event report. After the invalid actuation was completed, all systems affected were reset and returned to normal lineup. |
Where | |
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Monticello Minnesota (NRC Region 3) | |
Reporting | |
10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
Time - Person (Reporting Time:+967.8 h40.325 days <br />5.761 weeks <br />1.326 months <br />) | |
Opened: | William Stang 19:13 May 13, 2008 |
NRC Officer: | Jeff Rotton |
Last Updated: | May 13, 2008 |
44211 - NRC Website
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Unit 1 | |
---|---|
Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
WEEKMONTHYEARENS 565842023-04-28T09:02:00028 April 2023 09:02:00
[Table view]10 CFR 50.73(a)(1), Submit an LER 60 Day Notification for an Invalid Actuation of Primary Containment Isolation Logic ENS 557082021-11-29T17:28:00029 November 2021 17:28:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of Secondary Containment Relays ENS 524512016-10-24T23:45:00024 October 2016 23:45:00 10 CFR 50.73(a)(1), Submit an LER 60-Day Optional Telephonic Notification of Invalid Specified System Actuation ENS 448992009-01-20T16:10:00020 January 2009 16:10:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of Secondary Containment ENS 442112008-04-03T11:25:0003 April 2008 11:25:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of a Sbgt During Annunciator Test ENS 427882006-08-19T23:49:00019 August 2006 23:49:00 10 CFR 50.73(a)(1), Submit an LER Radiation Monitor Electrical Spike Causes Secondary Containment Isolation ENS 427402006-07-30T22:30:00030 July 2006 22:30:00 10 CFR 50.73(a)(1), Submit an LER Secondary Containment Isolation Due to 'B' Spent Fuel Rad Monitor Failure ENS 426522006-06-19T04:19:00019 June 2006 04:19:00 10 CFR 50.73(a)(1), Submit an LER Radiation Monitor Spiked Three Times 2023-04-28T09:02:00 | |