ENS 56464
ENS Event | |
|---|---|
12:05 Feb 16, 2023 | |
| Title | 60 Day Notification for an Invalid Actuation of the Emergency Service Water System |
| Event Description | The following information was provided by the licensee via email:
This 60-day telephone notification is being made per the reporting requirements specified by 10 CFR 50.73(a)(2)(iv)(A) and 10 CFR 50.73(a)(1) to describe an invalid specific system actuation of the Emergency Service Water (ESW) System. On 2/16/2023, while performing a calibration planned maintenance (PM) for a jacket water pressure indicator during a D13 diesel generator system outage window, the 'C' ESW pump unexpectedly auto-started. Subsequent investigation identified that the affected jacket water pressure indicator shares a common sensing line with a jacket water pressure switch that provides a back-up to the engine speed switch for the engine running signal. At the time the jacket water pressure indicator calibration PM was being performed, the power circuits for D13 diesel generator instrumentation were energized. Pressurization of the energized jacket water pressure switch during the pressure indicator calibration activity resulted in initiation of a false engine running signal to the `C' ESW pump start logic. This event is considered an invalid system actuation because the 'C' ESW pump started in response to a false signal that the D13 EDG was running when the D13 EDG did not start. The actuation was not initiated in response to actual plant conditions or parameters and was not a manual initiation. The ESW system functioned as expected in response to the actuation. The affected ESW pump was shut down in accordance with plant procedures. There was no impact on the health and safety of the public or plant personnel. 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 Other Unspec Reqmnt | |
| Time - Person (Reporting Time:+1296 h54 days <br />7.714 weeks <br />1.775 months <br />) | |
| Opened: | Tim Gallacher 11:05 Apr 11, 2023 |
| NRC Officer: | Sam Colvard |
| Last Updated: | Apr 11, 2023 |
| 56464 - NRC Website
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Unit 1 | |
|---|---|
| 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 417362005-05-31T14:31:00031 May 2005 14:31:00 Other Unspec Reqmnt Operation at Greater than Licensed Power Lever (106% Rated) Due to Recirc Pump Motor Generator Set Fault 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 414152005-02-17T05:00:00017 February 2005 05:00:00 Other Unspec Reqmnt Missing Calibration Source ENS 413462005-01-18T17:55:00018 January 2005 17:55:00 Other Unspec Reqmnt 24-Hour Condition of License Report for Potential Non-Compliance of the Fire Protection Program ENS 410432004-09-15T20:00:00015 September 2004 20:00:00 Other Unspec Reqmnt Potential Violation of License Condition - Operation Above Licensed Power Limit 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 | |