ENS 55240
ENS Event | |
|---|---|
13:15 Mar 10, 2021 | |
| Title | 60-Day Optional Telephonic Notification of an Invalid Specified System Actuation |
| Event Description | This telephone notification is provided in accordance with 10 CFR 50.73(a)(1) to report an invalid actuation of containment isolation valves in more than one system required by 10 CFR 50.73(a)(2)(iv)(A).
On March 10, 2021, at 0815 [CST], during the Unit 2 Refueling Outage (L2R18), while performing a test to verify functionality of an isolation relay following replacement of the relay, a Group 4 isolation signal was actuated. The Group 4 isolation logic affects both the Reactor Building Ventilation (VR) and Containment Vent and Purge (VQ) system [for both units]. All equipment responded as designed to the Group 4 isolation, including startup of Standby Gas Treatment (SBGT) to maintain secondary containment pressure [for both units]. Investigation determined that the cause of the isolation was an inadvertent contact of the self-retracting grip jumper between two adjacent terminals that caused a short to ground and a blown fuse during the test performance. The fuse was replaced and systems restored as needed for the plant condition. The containment isolation was not due to actual plant conditions or parameters meeting design criteria for containment isolation. Therefore, this is considered an invalid actuation. The NRC Resident Inspector has been informed of this notification. |
| Where | |
|---|---|
Lasalle  Illinois (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
| Time - Person (Reporting Time:+1372.83 h57.201 days <br />8.172 weeks <br />1.881 months <br />) | |
| Opened: | Jeffery Nugent 17:05 May 6, 2021 |
| NRC Officer: | Thomas Herrity |
| Last Updated: | May 10, 2021 |
| 55240 - 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 | Not Critical |
| Scram | No |
| Before | Cold Shutdown (0 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 552402021-03-10T13:15:00010 March 2021 13:15:00
[Table view]10 CFR 50.73(a)(1), Submit an LER 60-Day Optional Telephonic Notification of an Invalid Specified System Actuation ENS 530832017-10-06T14:10:0006 October 2017 14:10:00 10 CFR 50.73(a)(1), Submit an LER Invalid Specified System Actuation ENS 522272016-07-11T09:30:00011 July 2016 09:30:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of Division 1 Primary Containment Isolation Logic Due to a Blown Fuse ENS 491742013-05-22T16:34:00022 May 2013 16:34:00 10 CFR 50.73(a)(1), Submit an LER 60 Day Optional Telephonic Notification of Invalid Division 1 Containment Isolation Due to Motor Generator Trip ENS 462202010-07-26T23:19:00026 July 2010 23:19:00 10 CFR 50.73(a)(1), Submit an LER 60-Day Telephonic Notification in Lieu of a Written Licensee Event Report of Invalid Actuation ENS 458782010-03-05T10:39:0005 March 2010 10:39:00 10 CFR 50.73(a)(1), Submit an LER Invalid Isolation Signal Caused Msiv'S to Close ENS 433582007-03-15T06:02:00015 March 2007 06:02:00 10 CFR 50.73(a)(1), Submit an LER Invalid Eccs and System Actuations ENS 433332007-03-03T13:14:0003 March 2007 13:14:00 10 CFR 50.73(a)(1), Submit an LER Invalid Eccs Actuation During Refueling Outage ENS 427372006-06-04T09:19:0004 June 2006 09:19:00 10 CFR 50.73(a)(1), Submit an LER Invalid Rps Bus 'B' and Division 2 Pcis Actuations ENS 425262006-03-04T10:12:0004 March 2006 10:12:00 10 CFR 50.73(a)(1), Submit an LER Invalid Emergency Diesel Generator Start ENS 415602005-02-07T13:56:0007 February 2005 13:56:00 10 CFR 50.73(a)(1), Submit an LER Invalid Specified System Actuation 2021-03-10T13:15:00 | |