ENS 40895
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ENS Event | |
|---|---|
20:22 May 26, 2004 | |
| Title | 60 Day Invalid Automatic Actuation Report: Containment Isoaltion Valves in More than One System |
| Event Description | On May 26, 2004 at 16:22 hours and inadvertent primary containment isolation signal was initiated following restoration from a surveillance test on the 2A Reactor Enclosure ventilation exhaust duct radiation monitor. The isolation was due to a fuse failure that caused isolation signals on Group 6A, 6B, 6C, and 7A primary containment isolation valves (PCIVs). The Unit 2 reactor enclosure ventilation isolated. The 2A standby gas treatment system (SGTS) and 2A reactor enclosure recirculation system (RERS) trains initiated. The instrument gas compressor suction valve and the 2A instrument gas header supply valve closed. The containment nitrogen inerting valve and the 2A instrument gas header supply valve closed. The containment nitrogen inerting block valve closed. The containment atmospheric sample valves received an isolation signal but were in a closed position prior to the event. All system functioned as designed during the event.
The laboratory analysis of the fuse determined that the most probable cause of the event was an age related degradation of the fuse that reduced its current carrying capacity. The fuse was operating under steady state conditions for approximately 30 seconds prior to the failure. A fuse replacement plan was in progress prior to the event due to prior age related failures of this type of fuse. The fuse replacement plan will be evaluated to ensure the current schedule is adequate. Component data: Type: Fuse Manufacturer: Bussmann Model number: MIN-5 The NRC Resident Inspector was notified of this event by the licensee. |
| Where | |
|---|---|
Limerick  Pennsylvania (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
| Time - Person (Reporting Time:+1382.8 h57.617 days <br />8.231 weeks <br />1.894 months <br />) | |
| Opened: | Stan Gamble 11:10 Jul 23, 2004 |
| NRC Officer: | John Mackinnon |
| Last Updated: | Jul 23, 2004 |
| 40895 - NRC Website
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Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 564642023-02-16T12:05:00016 February 2023 12:05:00
[Table view]Other Unspec Reqmnt, 10 CFR 50.73(a)(1), Submit an LER 60 Day Notification for an Invalid Actuation of the Emergency Service Water System ENS 562832022-11-02T23:29:0002 November 2022 23:29:00 10 CFR 50.73(a)(1), Submit an LER 60-DAY Telephonic Notification - Invalid Specific System Actuation ENS 553452021-05-13T11:00:00013 May 2021 11:00:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of Containment Isolation Signal ENS 540832019-04-18T06:49:00018 April 2019 06:49:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of a Unit 2 Containment Isolation Logic Due to a Blown Fuse ENS 540142019-02-22T15:30:00022 February 2019 15:30:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of a Unit 1 Containment Isolation Logic Due to a Blown Fuse ENS 519522016-03-28T05:50:00028 March 2016 05:50:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of Inboard Isolation Logic ENS 485752012-10-13T23:41:00013 October 2012 23:41:00 10 CFR 50.73(a)(1), Submit an LER 60-Day Optional Telephonic Notification of Invalid Multiple System Actuations ENS 468832011-04-02T16:18:0002 April 2011 16:18:00 10 CFR 50.73(a)(1), Submit an LER Loss of Rps/Ups Power Supply ENS 459622010-04-03T01:56:0003 April 2010 01:56:00 10 CFR 50.73(a)(1), Submit an LER Overvoltage Condition Causes Reactor Protective System Actuation ENS 455182009-10-19T16:05:00019 October 2009 16:05:00 10 CFR 50.73(a)(1), Submit an LER Automatic Closure of Primary Containment Isolation Valves Due to Invalid Signal ENS 442602008-04-09T08:16:0009 April 2008 08:16:00 10 CFR 50.73(a)(1), Submit an LER 60-Day Optional Notification for Invalid Specified System Actuation ENS 433662007-03-19T06:20:00019 March 2007 06:20:00 10 CFR 50.73(a)(1), Submit an LER Invalid Specified System Actuations During Testing ENS 428302006-07-09T22:49:0009 July 2006 22:49:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of the B Esw Pump ENS 425722006-03-14T21:40:00014 March 2006 21:40:00 10 CFR 50.73(a)(1), Submit an LER Inadvertant Core Spray Pump Actuation ENS 416672005-03-06T19:07:0006 March 2005 19:07:00 10 CFR 50.73(a)(1), Submit an LER Invalid Safety System Actuation During an Outage ENS 408952004-05-26T20:22:00026 May 2004 20:22:00 10 CFR 50.73(a)(1), Submit an LER 60 Day Invalid Automatic Actuation Report: Containment Isoaltion Valves in More than One System 2023-02-16T12:05:00 | |
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