ENS 57491
ENS Event | |
|---|---|
03:06 Dec 7, 2024 | |
| Title | 60-DAY Notification of Invalid Specified System Actuation |
| Event Description | The following information was provided by the licensee via phone and email:
This 60-day optional telephone notification is being made in lieu of a licensee event report (LER) submittal as allowed by 10 CFR 50.73(a)(1). This notification is made pursuant to the reporting requirements specified in 10 CFR 50.73(a)(2)(iv)(A) for an invalid actuation of one of the systems listed in 10 CFR 50.73(a)(2)(iv)(B). At approximately 2104 CST, on December 6, 2024, while at 100 percent power, an invalid actuation of the B2G load sequencer (B Train) occurred due to a human performance error during maintenance. The B2G load sequencer initiated a complete actuation of the 'B' Train which included auxiliary feedwater (AFW) and closing the 2B diesel generator (DG) output breaker as designed. All systems started successfully. The 2B DG was not running at the time nor was it required to be. The DG breaker protective relay actuated and the 2B DG was declared inoperable. Operators immediately recognized the invalid signal and immediately secured the AFW system at 2106 CST. The auto start of the AFW system had negligible effects on plant systems and reactor power. Following event investigation and equipment inspections, the 2B DG was returned to operable status in approximately 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. The actuation was not initiated in response to actual plant conditions, it was not an intentional manual initiation, and there were no parameters satisfying the requirements for initiation of the system. Therefore, this event has been determined to be an invalid actuation. This event did not result in any adverse impact to the health and safety of the public. The Resident Inspector was immediately notified. |
| Where | |
|---|---|
| Farley Alabama (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
| Time - Person (Reporting Time:+895.1 h37.296 days <br />5.328 weeks <br />1.226 months <br />) | |
| Opened: | Roosevelt Scott 10:12 Jan 13, 2025 |
| NRC Officer: | Eric Simpson |
| Last Updated: | Jan 13, 2025 |
| 57491 - NRC Website
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Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 574912024-12-07T03:06:0007 December 2024 03:06:00
[Table view]10 CFR 50.73(a)(1), Submit an LER 60-DAY Notification of Invalid Specified System Actuation ENS 489782013-02-28T20:36:00028 February 2013 20:36:00 10 CFR 50.73(a)(1), Submit an LER Inadvertent Actuation of the Turbine Driven Auxiliary Feedwater Pump ENS 474752011-11-03T09:48:0003 November 2011 09:48:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of a Safety Injection Valve ENS 471572011-08-06T15:55:0006 August 2011 15:55:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of Motor Driven Auxiliary Feedwater Pump ENS 422162005-12-07T05:00:0007 December 2005 05:00:00 10 CFR 50.73(a)(1), Submit an LER Invalid Specified System Actuation - "a" Auxiliary Feedwater 2024-12-07T03:06:00 | |