ENS 46883
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ENS Event | |
|---|---|
16:18 Apr 2, 2011 | |
| Title | Loss of Rps/Ups Power Supply |
| Event Description | On Saturday, April 2, 2011, Unit 2 refueling outage activities were in progress. The 2A RPS/UPS Static Inverter was out of service and bypassed with loads transferred to the primary alternate power supply. At 1218 hours0.0141 days <br />0.338 hours <br />0.00201 weeks <br />4.63449e-4 months <br />, a post maintenance test was performed on the secondary alternate power supply. The inverter alternate power manual transfer switch was transferred from the 'primary alternate' to 'secondary alternate' position to support the post maintenance test. Since the transfer switch is 'break before make' the alternate power supply was interrupted momentarily. This deenergized the 2A RPS/UPS power distribution panel loads including the Division IA and IIA RPS relays and Division IA and IIA NSSSS [Nuclear Steam Supply Shutoff System] relays. Primary containment isolation valves (PCIVs) automatically closed on more than one system. The IB and IIB channels were unaffected.
The portion of the primary containment isolation system that received an actuation signal functioned successfully. All of the affected open isolation valves automatically closed. The isolation was a partial actuation of the isolation actuation instrumentation. This 60-day ENS report is being made per 10CFR 50.73(a)(2)(iv)(A) and 10CFR50.73(a)(1) to report invalid automatic actuations of systems listed in paragraph (a)(2)(iv)(B). The listed system that actuated was general containment isolation signals affecting containment isolation valves in more than one system. Primary containment isolation valves (PCIVs) closed on drywell chilled water (DWCW), reactor enclosure cooling water (RECW), primary containment instrument gas (PCIG), and suppression pool cleanup. The licensee has notified the NRC Resident Inspector. |
| Where | |
|---|---|
Limerick  Pennsylvania (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
| Time - Person (Reporting Time:+1267.3 h52.804 days <br />7.543 weeks <br />1.736 months <br />) | |
| Opened: | Paul Marvel 11:36 May 25, 2011 |
| NRC Officer: | Vince Klco |
| Last Updated: | May 25, 2011 |
| 46883 - NRC Website
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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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