ENS 44352
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ENS Event | |
---|---|
20:31 Jun 9, 2008 | |
Title | 60 Day Report - Invalid Actuation of Main Steam Isolation System |
Event Description | This 60-day optional report, as allowed by 10 CFR 50.73 (a)(1), is being made under the reporting requirement in 10 CFR 50.73 (a)(2)(iv)(A) to describe an invalid actuation of a specified system, specifically the Main Steam (SM) System. On June 9, 2008, at 1631 with Unit 1 in Mode 5, an invalid signal was generated on Train B of the SM system during Engineered Safety Features testing. During the performance of returning the Solid State Protection System (SSPS) to 'normal', the SSPSB mode selector switch was placed to operate. A Unit 1 Feedwater and Main Steam isolation occurred. Part of the 'return to normal' sequence is to place the SSPS Input Error Inhibit switch to the inhibit position. The technician failed to insure the inhibit switch 'snapped' into position and trip signals were generated when the Output Test relay switch was placed to Operate. The SM system was returned to standby readiness. This was considered a partial system/train actuation. During this event, the SM system performed as expected. This event was entered into the site specific corrective action program for resolution.
The licensee has notified the NRC Resident Inspector, and will be notifying the State, local and other government agencies. |
Where | |
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Catawba South Carolina (NRC Region 2) | |
Reporting | |
10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
Time - Person (Reporting Time:+902.28 h37.595 days <br />5.371 weeks <br />1.236 months <br />) | |
Opened: | Bert Anderson 10:48 Jul 17, 2008 |
NRC Officer: | John Knoke |
Last Updated: | Jul 17, 2008 |
44352 - NRC Website
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Unit 1 | |
---|---|
Reactor critical | Not Critical |
Scram | No |
Before | Cold Shutdown (0 %) |
After | Cold Shutdown (0 %) |
WEEKMONTHYEARENS 491952013-05-28T17:39:00028 May 2013 17:39:00
[Table view]10 CFR 50.73(a)(1), Submit an LER 60 Day Report - Invalid Actuation of Specified System ENS 487062012-12-22T06:42:00022 December 2012 06:42:00 10 CFR 50.73(a)(1), Submit an LER 60 Day Report - Invalid Actuation of the Afw System ENS 443522008-06-09T20:31:0009 June 2008 20:31:00 10 CFR 50.73(a)(1), Submit an LER 60 Day Report - Invalid Actuation of Main Steam Isolation System ENS 440512008-01-24T07:35:00024 January 2008 07:35:00 10 CFR 50.73(a)(1), Submit an LER 60 Day Report - Invalid Actuation of the Nuclear Service Water System ENS 428732006-08-08T20:17:0008 August 2006 20:17:00 10 CFR 50.73(a)(1), Submit an LER 60 Day Report - Invalid Actuation of Auxiliary Feed Pump 2B ENS 411322004-08-22T08:50:00022 August 2004 08:50:00 10 CFR 50.73(a)(1), Submit an LER 60 Day Report - Invalid Actuation of Specified System 2013-05-28T17:39:00 | |
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