ENS 47859
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ENS Event | |
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05:38 Feb 25, 2012 | |
Title | Invalid Actuation of Standby Gas Treatment Secondary Containment Isolation Valves (Scivs) |
Event Description | During restoration of Unit 1 reactor protection system (RPS) following preventive maintenance (PM), a link was closed on February 25, 2012 at 0138 EST that resulted in the automatic actuation of the standby gas treatment (SGT) trains for Units 1 and 2 and the automatic isolation of the associated SCIVs (Secondary Containment Isolation Valves). The instruments that input to the actuation logic were in the tripped condition during the performance of the PM with links opened to preclude the automatic response of the SCIVs. The PM procedure did not contain the necessary steps to ensure that the associated instruments that input into the actuation logic were reset prior to reclosing the links that were previously opened to disable their input to the logic. Reclosing the first link associated with a Unit 1 reactor building high radiation monitor trip resulted in an actuation signal that caused the Unit 1 and 2 SGT trains to automatically start as designed, Unit 1 and 2 reactor building normal ventilation to shut down and the Unit 1 and 2 SCIVs to automatically close. This actuation was therefore not the result of a valid signal. The automatic actuation of the SGT system and the isolation of Unit 1 and 2 SCIVs are considered an invalid actuation since the parameters that cause this actuation to occur had not been exceeded. For this reason the actuation is considered invalid and a report to the NRC is not required by 10CFR50.72(b)(3)(iv); however, because the secondary containment isolation signals affected containment isolation valves in more than one system (Unit 1 and 2 components affected) the event is reportable as required by 10CFR50.73(a)(2)(iv)(B)(2). A licensee event report (LER) is required, but a telephone notification is allowed by 10CFR50.73. In the case of an invalid actuation reported under 10CFR50.73(a)(2)(iv), other than actuation of the reactor protection system (RPS) when the reactor is critical, the licensee may, at its option, provide a telephone notification to the NRC Operations Center within 60 days after discovery of the event instead of submitting a written LER. The affected procedure(s) will be revised to ensure the affected instruments are reset prior to returning the system to service to preclude recurrence during the performance of future RPS PM activities.
The four Standby Gas Treatment (SBGT) fans auto started and both Unit 1 and Unit 2 reactor building and refueling floor normal ventilation systems automatically shutdown and isolated as designed. The SBGT initiation and the ventilation system shutdown were both complete actuations. The licensee notified the NRC Resident Inspector. |
Where | |
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Hatch Georgia (NRC Region 2) | |
Reporting | |
10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
Time - Person (Reporting Time:+1419.23 h59.135 days <br />8.448 weeks <br />1.944 months <br />) | |
Opened: | Daniel Komm 07:52 Apr 24, 2012 |
NRC Officer: | Pete Snyder |
Last Updated: | Apr 24, 2012 |
47859 - NRC Website
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WEEKMONTHYEARENS 568972023-11-02T01:11:0002 November 2023 01:11:00
[Table view]10 CFR 50.73(a)(1), Submit an LER 60 Day Notification for an Invalid Specified System Actuation ENS 551882021-02-18T03:20:00018 February 2021 03:20:00 10 CFR 50.73(a)(1), Submit an LER Automatic Actuation of Group 2 Containment Isolation Logic ENS 551872021-02-13T03:23:00013 February 2021 03:23:00 10 CFR 50.73(a)(1), Submit an LER Automatic Actuation of Group I Containment Isolation Logic ENS 538172018-11-12T05:00:00012 November 2018 05:00:00 10 CFR 50.73(a)(1), Submit an LER Invalid Specified System Actuation ENS 528182017-04-27T04:29:00027 April 2017 04:29:00 10 CFR 50.73(a)(1), Submit an LER Invalid Specified System Actuation Due to Failed Relay ENS 528032017-04-17T15:20:00017 April 2017 15:20:00 10 CFR 50.73(a)(1), Submit an LER 60-Day Optional Telephonic Notification of Invalid Specified System Actuation ENS 526852017-02-17T15:21:00017 February 2017 15:21:00 10 CFR 50.73(a)(1), Submit an LER 60-Day Optional Telephonic Notification of Invalid Specified System Actuation ENS 496412013-10-21T09:19:00021 October 2013 09:19:00 10 CFR 50.73(a)(1), Submit an LER 60 Optional Report - Invalid Partial Reactor Protection System Actuation ENS 490552013-03-24T14:09:00024 March 2013 14:09:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of Hpci Suction Valves ENS 487212012-12-08T06:16:0008 December 2012 06:16:00 10 CFR 50.73(a)(1), Submit an LER 60-Day Optional Telephone Notification of Invalid System Actuation ENS 485652012-10-08T22:09:0008 October 2012 22:09:00 10 CFR 50.73(a)(1), Submit an LER 60-Day Optional Telephonic Notification of Invalid System Actuation ENS 483702012-08-06T01:25:0006 August 2012 01:25:00 10 CFR 50.73(a)(1), Submit an LER Rps Sub-Component Failure Caused Half Scram with Group 2 Pciv Actuation ENS 478592012-02-25T05:38:00025 February 2012 05:38:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of Standby Gas Treatment Secondary Containment Isolation Valves (Scivs) ENS 473372011-08-12T09:03:00012 August 2011 09:03:00 10 CFR 50.73(a)(1), Submit an LER 60 Day Optional Telephone Notification for an Invalid Specified System Actuation ENS 461152010-05-29T12:49:00029 May 2010 12:49:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of Primary Containment Isolation Valves Due to a Faulty Transistor ENS 459812010-04-16T23:15:00016 April 2010 23:15:00 10 CFR 50.73(a)(1), Submit an LER Invalid Specified System Actuation ENS 458352010-02-23T14:50:00023 February 2010 14:50:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of Standby Gas Treatment System ENS 432762007-02-25T08:58:00025 February 2007 08:58:00 10 CFR 50.73(a)(1), Submit an LER Invalid Secondary Containment Isolation ENS 424922006-02-28T06:50:00028 February 2006 06:50:00 10 CFR 50.73(a)(1), Submit an LER Invalid System Actuation Due to Work Instruction Error ENS 421102005-10-07T15:37:0007 October 2005 15:37:00 10 CFR 50.73(a)(1), Submit an LER Invalid System Actuation ENS 415902005-02-19T10:50:00019 February 2005 10:50:00 10 CFR 50.73(a)(1), Submit an LER 60 Day Invalid Actuation of System Report. 2023-11-02T01:11:00 | |
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