ENS 58069

v t e ENS Event
14:48 Oct 3, 2025
Title	60-DAY Report of Invalid Emergency Feedwater System Actuation
Event Description	The following information was provided by the licensee via phone and email: As allowed by 10 CFR 50.73(a)(1), VC Summer Nuclear Station (VCSNS) is making a 60-day notification of an invalid actuation under 10 CFR 50.73(a)(2)(iv)(A). At 0948 EDT, on October 3, 2025, VCSNS commenced a shutdown to repair a steam line leak. On October 4 at 2116 EDT, VCSNS was in mode 3, with the 'A' motor-driven emergency feedwater (EFW) pump providing decay heat removal. Main feedwater (MFW) had been secured per standard operating procedures. The deaerator storage tank (DAST) experienced a level decrease due to secondary-side valve leak-by. When the DAST level reached low-low level, an automatic signal was generated to secure the already secured MFW Pumps, which automatically sent an actuation signal to EFW. The low-low DAST signal is intended to secure MFW pumps to prevent damage due to a potential loss of net positive suction head at lower DAST levels. This sequence resulted in the invalid actuation of the previously secured 'B' EFW pump. This actuation was not in response to an actual engineered safety feature (ESF) condition and does not meet the criteria for a valid ESF actuation. This event is being reported as a 60-day report in accordance with 10 CFR 50.73(a)(1) for an invalid actuation of the EFW System. The NRC Senior Resident Inspector has been notified.

ENS 58069 +/-
Where
Summer South Carolina (NRC Region 2)
Reporting

10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation
Time - Person (Reporting Time:+1460.63 h60.86 days <br />8.694 weeks <br />2.001 months <br />)
Opened:	Justin Bouknight 12:26 Dec 3, 2025
NRC Officer:	Karen Cotton
Last Updated:	Dec 3, 2025
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v • d • e

v t e Emergency Notification System
Summer with 10 CFR 50.73(a)(1), Submit an LER
WEEKMONTHYEAR2025-10-03T14:48:00 [Table view]
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