ENS 43097
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ENS Event | |
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02:28 Nov 20, 2006 | |
Title | Invalid Actuation of Primary Containment Isolation System |
Event Description | This telephone report is being made in accordance with 10 CFR 50.73(a)(2)(iv)(A) as an event or condition caused by an invalid signal that resulted in an automatic actuation on November 19, 2006 at 2028 CST of the following Primary Containment Isolation System (PCIS) groups:
The systems above functioned as designed. Reactor Protection System (RPS) bus 'B' had lost power from its Motor Generator (MG) and was found de-energized which caused the actuations. Power was restored to the RPS bus 'B' from auxiliary power, and plant systems were recovered. In addition to the actuations reported above, the following actuations also occurred and functioned as designed.
The cause of the invalid signal was 'B' RPS MG set high voltage condition produced by a faulty voltage adjust potentiometer in the voltage regulator. This caused a protective relay to trip the RPS MG exciter field which caused the subsequent low voltage and loss of the 'B' RPS bus. The licensee notified the NRC Resident Inspector. |
Where | |
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Cooper ![]() Nebraska (NRC Region 4) | |
Reporting | |
10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
Time - Person (Reporting Time:+1285.08 h53.545 days <br />7.649 weeks <br />1.76 months <br />) | |
Opened: | Edward Mcmutchen, Jr 15:33 Jan 12, 2007 |
NRC Officer: | John Knoke |
Last Updated: | Jan 12, 2007 |
43097 - NRC Website
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WEEKMONTHYEARENS 537762018-10-13T05:00:00013 October 2018 05:00:00
[Table view]10 CFR 50.73(a)(1), Submit an LER 60-Day Optional Telephonic Notification of Invalid Specified System Actuation ENS 524362016-10-28T07:39:00028 October 2016 07:39:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of Containment Isolation Valves ENS 463672010-08-31T22:37:00031 August 2010 22:37:00 10 CFR 50.73(a)(1), Submit an LER Invalid Primary Containment Isolation System Actuation Due to a Voltage Transient ENS 430972006-11-20T02:28:00020 November 2006 02:28:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of Primary Containment Isolation System ENS 406972004-03-09T18:42:0009 March 2004 18:42:00 10 CFR 50.73(a)(1), Submit an LER Invalid System Actuation Due to Momentary Power Interruption 2018-10-13T05:00:00 | |
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