ENS Event | |
|---|---|
05:10 Apr 18, 2019 | |
| Title | 60-Day Optional Telephonic Notification Due to Invalid Specified System Actuation |
| Event Description | This 60-day telephone notification is being made in accordance with the reporting requirements specified by 10 CFR 50.73(a)(1) and 10 CFR 50.73(a)(2)(iv)(A) to describe an invalid actuation of a general containment isolation signal affecting multiple Main Steam Isolation Valves (MSIVs).
On April 18, 2019 at approximately 0110 EDT, during performance of an ASME reactor vessel leak check, all four inboard MSIVs closed as a result of actuation of the Main Steam Line (MSL) high flow instrumentation. The high flow signal was spurious on the 'D' channel with no flow in the MSLs. Since an actual high flow condition did not exist at the time of the actuation, the actuation was considered invalid. The MSIVs functioned as designed on actuation of the MSL high flow instrumentation. All outboard MSIVs were closed at the time of the actuation in accordance with the vessel leak check procedure. The NRC Resident Inspector has been notified. |
| Where | |
|---|---|
Susquehanna  Pennsylvania (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
| Time - Person (Reporting Time:+1182.87 h49.286 days <br />7.041 weeks <br />1.62 months <br />) | |
| Opened: | Lonnie Crawford 12:02 Jun 6, 2019 |
| NRC Officer: | Rodney Clagg |
| Last Updated: | Jun 6, 2019 |
| 54103 - NRC Website
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Unit 2 | |
|---|---|
| Reactor critical | Not Critical |
| Scram | No |
| Before | Cold Shutdown (0 %) |
| After | Cold Shutdown (0 %) |
WEEKMONTHYEARENS 541032019-04-18T05:10:00018 April 2019 05:10:00
[Table view]10 CFR 50.73(a)(1), Submit an LER 60-Day Optional Telephonic Notification Due to Invalid Specified System Actuation ENS 527722017-04-03T01:27:0003 April 2017 01:27:00 10 CFR 50.73(a)(1), Submit an LER 60-Day Optional Telephonic Notification of Invalid Specified System Actuation ENS 480922012-05-14T13:28:00014 May 2012 13:28:00 10 CFR 50.73(a)(1), Submit an LER 60-Day Optional Telephonic Notification for an Invalid Emergency Service Water Actuation ENS 457262010-02-25T19:18:00025 February 2010 19:18:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of Containment Isolation Valves ENS 435552007-06-09T09:11:0009 June 2007 09:11:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of the 'C' Emergency Diesel Generator ENS 424892006-03-11T09:32:00011 March 2006 09:32:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of Containment Isolation Valves ENS 407662004-04-04T18:57:0004 April 2004 18:57:00 10 CFR 50.73(a)(1), Submit an LER 60 -Day Report: Invalid Actuation of the "E" Emergency Diesel Generator ENS 407332004-03-21T16:32:00021 March 2004 16:32:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of Containment Isolation Signals in More than One System ENS 401732003-08-29T14:25:00029 August 2003 14:25:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of Containment Isolation Valves 2019-04-18T05:10:00 | |