ENS 43276
ENS Event | |
|---|---|
08:58 Feb 25, 2007 | |
| Title | Invalid Secondary Containment Isolation |
| Event Description | The following information is provided as a 60 day telephone notification to NRC under 10 CFR 50.73(a)(1) in lieu of submitting a written LER to report a condition that resulted in an invalid actuation of the 10CFR50.73(a)(2)(iv)(B) [general containment isolation signals affecting containment isolation valves in more than one system or multiple main steam isolation valves]. NUREG1022 Revision 2 identifies the information that needs to be reported as discussed below.
(a) The specific train(s) and system(s) that were actuated. This report is being made under 10CFR50.73(a)(2)(iv)(a). On February 25, 2007 at 3:58 AM EST Units 1 and 2 received an invalid full Secondary Containment Isolation. The following initiations and isolations were observed: All Fission Product Monitor Valves isolated, both Units' SBGT trains initiated and the reactor building ventilation supply and exhaust fans tripped and isolated, and the refueling floor ventilation supply and exhaust fans tripped and isolated. Operations personnel verified that all Secondary Containment isolations and initiations occurred as expected. The isolation was caused by a blown fuse. During investigation into the Secondary Containment isolation, fuse 1D11A-F14A in panel 1H11-P606 was found to be blown. After replacing this fuse, the isolation signal cleared and all related systems were returned to normal operation. Fuse 1D11A-F14A supplies the trip auxiliary units 1C51A-Z2A and 1C51A-Z2C. Loss of power to these units de-energizes several relays which are also deenergized as a result of a Refueling Floor Vent High Radiation signal which would actuate the same isolation logic and cause an SBGT initiation. (b) Whether each train actuation was complete or partial. The four Standby Gas Treatment (SBGT) fans auto started and both Unit One and Unit Two reactor building and refueling floor normal ventilation systems automatically shutdown and isolated. The SBGT initiation and the ventilation system shutdown were both complete actuations. (c) Whether or not the system started and functioned successfully. The above system functioned successfully. The licensee will inform the NRC Resident Inspector. |
| Where | |
|---|---|
Hatch  Georgia (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
| Time - Person (Reporting Time:+918.05 h38.252 days <br />5.465 weeks <br />1.258 months <br />) | |
| Opened: | Jim Anderson 14:01 Apr 4, 2007 |
| NRC Officer: | Pete Snyder |
| Last Updated: | Apr 4, 2007 |
| 43276 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
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 | |