ENS 42830
ENS Event | |
|---|---|
22:49 Jul 9, 2006 | |
| Title | Invalid Actuation Of The B Esw Pump |
| Event Description | This 60-day ENS report is being made per 10CFR 50.73(a)(2)(iv)(A) and 10CFR50.73(a)(1) to report an invalid automatic actuation of systems listed in paragraph (a)(2)(iv)(B), namely emergency service water (ESW).
On Sunday July 9, 2006, at 18:49 hours, an invalid actuation of the B ESW pump occurred. The B ESW loop start was a partial actuation and the loop functioned successfully following the invalid actuation. The A ESW loop was not affected. An investigation identified that corrosion on the D12 emergency diesel generator (EDG) jacket water pump discharge pressure switch caused the invalid partial actuation. The cause of the pressure switch failure was due to a cracked supply tube, which allowed moisture to enter the cabinet causing the corrosion. EDG jacket water pump discharge pressure is utilized to initiate logic that starts the ESW pump when the EDG is running. ESW is the cooling medium for the EDG. The switch failure also caused inoperability of D12 EDG since it defeated the capability for the EDG to start. The failed pressure switch and associated tubing were replaced and successfully tested. D12 EDG was declared operable on Monday July 10, 2006 at 12:46 hours. An inspection of the other seven EDGs identified that the D11 EDG pressure switch was also corroded. The D11 EDG pressure switch was replaced. The inspection determined that the jacket water pressure switches on the other six EDGs were not degraded. This event is reportable per 10CFR50.73(a)(2)(iv)(A) since B ESW pump automatically actuated on an invalid signal. Component data: Equipment number: PSH-GA-110B Manufacturer: A160 Allen-Bradley Co. Model number: 636-C3 The licensee 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:+1409.57 h58.732 days <br />8.39 weeks <br />1.931 months <br />) | |
| Opened: | Paul R Marvel 16:23 Sep 6, 2006 |
| NRC Officer: | Jason Kozal |
| Last Updated: | Sep 6, 2006 |
| 42830 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
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 | |