Emergency Feedwater System (EFWS)
See also Emergency Feedwater Actuation System
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| | Site | Start date | Title | Description |
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| IR 05000395/2025003 | Summer
07201038 | 16 December 2025 | Integrated Inspection Report 05000395/2025003 and 07201038/2024001 and Apparent Violation and Exercise of Enforcement Discretion | | | IR 05000443/2025003 | Seabrook | 9 December 2025 | Integrated Inspection Report 05000443/2025003 | | | ML25307A199 | Davis Besse | 20 November 2025 | Individual Notice for Davis-Besse Technical Specification 3.8.1 License Amendment Request (FRN) | | | ML25323A421 | Summer | 19 November 2025 | Notice of Enforcement Discretion NOED for Virgil C. Summer Nuclear Plant Unit 1 EPID L 2025 LLD 0007 | | | ML25322A212 | Summer | 18 November 2025 | Request for Enforcement Discretion from Technical Specification 3.7.1.2 Emergency Feedwater System | | | L-25-190, Vistra Operations Company LLC (Vistra Opco), License Amendment Request - Alternative Technical Specification (TS) 3.8.1 Action A.3 Completion Time for an Inoperable Offsite Source | Davis Besse | 22 October 2025 | Vistra Operations Company LLC (Vistra Opco), License Amendment Request - Alternative Technical Specification (TS) 3.8.1 Action A.3 Completion Time for an Inoperable Offsite Source | | | 05000395/LER-2025-003, V.C Summer Nuclear Station, Unit 1, Potential Condition Prohibited by Technical Specifications | Summer | 17 October 2025 | V.C Summer Nuclear Station, Unit 1, Potential Condition Prohibited by Technical Specifications | | | ENS 57987 | Summer | 14 October 2025 19:52:00 | Automatic Reactor Trip | The following information was provided by the licensee via phone and email:
At 1552 EDT on October 14, 2025, with Unit 1 in mode 1 at 100 percent power, the reactor automatically tripped due to a turbine trip. The trip was not complex with all systems responding normally post-trip.
Operations responded and stabilized the plant. Decay heat is being removed by the emergency feedwater system.
Due to the reactor protection system actuation while critical, this event is being reported as a 4-hour, non-emergency notification per 10 CFR 50.72(b)(2)(iv)(B) and an 8-hour, non-emergency notification per 10 CFR 50.72(b)(3)(iv)(A) for valid actuation of the reactor protection and emergency feedwater systems. There was no impact on the health and safety of the public or plant personnel. The NRC resident inspector has been notified.
The following additional information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance:
A generator field breaker lockout occurred. In addition, a small fire was observed in the generator field breaker and extinguished in less than 15 minutes by the onsite fire brigade. The unit is stable in hot standby with emergency feedwater and main condenser steam dumps in-service. | | ENS 58069 | Summer | 3 October 2025 14:48:00 | 60-DAY Report of Invalid Emergency Feedwater System Actuation | 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. | | 05000456/LER-2025-001, Over Temperature Delta Temperature Due to Lightning Strike | Braidwood | 26 September 2025 | Over Temperature Delta Temperature Due to Lightning Strike | |
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