ENS 56625
ENS Event | |
|---|---|
10:39 May 17, 2023 | |
| Title | 60-DAY Optional Telephonic Notification for an Invalid Actuation of an Emergency AC Electrical Power System |
| Event Description | The following information was provided by the licensee email:
At 0339 CDT on May 17, 2023, diesel generator 3 (DG3) had an auto-start during a surveillance test of excess flow check valves in containment atmosphere instrument sensing lines. During the surveillance, workers failed to recognize residual pressure in the system from the test. Per procedure, MS-PS-47C (main steam pressure switch) was placed back in service, resulting in initiation logic for both the high pressure core spray (HPCS) system and DG3 auto-start. Because the HPCS system was tagged out of service for maintenance it did not actuate. The auto-start of DG3 was an expected response to the high drywell pressure indication. The signals cleared, and DG3 was shutdown per procedure. As indicated in 10 CFR 50.73(a)(1), in the case of an invalid actuation reported under 10 CFR 50.73(a)(2)(iv)(A), the licensee may, at its option, provide a telephonic notification to the NRC Operations Center within 60 days of discovery of the event instead of submitting a written licensee event report. This 60-day telephone notification is being made in accordance with 10 CFR 50.73(a)(1) for invalid actuations reported under 10 CFR 50.73 (a)(2)(iv)(A). This actuation was invalid since it was caused by programmatic issues in quality of procedural guidance and not the result of actual plant conditions warranting auto-start of DG3. The actuations were not initiated in response to actual plant conditions, this was not an intentional manual initiation, and there were no parameters satisfying the requirements for initiation. Therefore, this event has been determined to be an invalid actuation. Diesel generator 3 system responded as designed to the actuation signal. The HPCS system did not actuate since it was tagged out of service. There was no impact on the health and safety of the public or plant personnel. The following information is provided as specified in NUREG-1022: (a) The diesel generator 3 was actuated. (b) The actuation of DG3 was complete. (c) The DG3 train was started and functioned successfully. The NRC Resident Inspector has been notified. |
| Where | |
|---|---|
Columbia Generating Station  Washington (NRC Region 4) | |
| Reporting | |
| 10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
| Time - Person (Reporting Time:+1467.57 h61.149 days <br />8.736 weeks <br />2.01 months <br />) | |
| Opened: | Dan Sharpe 14:13 Jul 17, 2023 |
| NRC Officer: | Adam Koziol |
| Last Updated: | Jul 17, 2023 |
| 56625 - NRC Website
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WEEKMONTHYEARENS 566252023-05-17T10:39:00017 May 2023 10:39:00
[Table view]10 CFR 50.73(a)(1), Submit an LER 60-DAY Optional Telephonic Notification for an Invalid Actuation of an Emergency AC Electrical Power System ENS 528692017-05-25T23:47:00025 May 2017 23:47:00 10 CFR 50.73(a)(1), Submit an LER Invalid High Pressure Core Spray (Hpcs) System Actuation in Mode 5 ENS 494602013-08-23T14:54:00023 August 2013 14:54:00 10 CFR 50.73(a)(1), Submit an LER 60-Day Optional Telephonic Notification for an Invalid Primary Containment Isolation Valve Actuation ENS 481392012-05-31T12:35:00031 May 2012 12:35:00 10 CFR 50.73(a)(1), Submit an LER 60-Day Optional Telephonic Notification for an Invalid Primary Containment Isolation Valve Actuation ENS 469772011-04-23T15:14:00023 April 2011 15:14:00 10 CFR 50.73(a)(1), Submit an LER Invalid Primary Containment Isolation System Actuation Due to Unrecognized Design Conflict ENS 469722011-04-21T20:10:00021 April 2011 20:10:00 10 CFR 50.73(a)(1), Submit an LER Invalid Primary Containment Isolation System Actuation Due to Conflicting Work Activities ENS 468972011-04-01T04:28:0001 April 2011 04:28:00 10 CFR 50.73(a)(1), Submit an LER 60-Day Telephonic Notification of Invalid Specified System Actuation 2023-05-17T10:39:00 | |