| | Site | Start date | Title | Description |
|---|
| ENS 58042 | Sequoyah | 17 November 2025 14:11:00 | Control Room Emergency Ventilation System Inoperable | The following information was provided by the licensee via phone and email:
At 0911 EST, on 11/17/2025, it was discovered that both trains of the control room emergency ventilation system were simultaneously inoperable due to an unauthorized door breach of a door in the control room envelope; therefore, this condition is being reported as an eight-hour, non-emergency notification per 10 CFR 50.72(b)(3)(v)(D). At 0913 EST, the door was closed, and both trains of the control room emergency ventilation system were restored to operable.
There was no impact on the health and safety of the public or plant personnel. The NRC Resident Inspector has been notified. |
| ENS 57994 | Wolf Creek | 21 October 2025 11:10:00 | Both Trains of Control Room Emergency Ventilation System Inoperable | The following is a summary of information provided by the licensee via phone and email:
On October 21, 2025, at 0610 CDT, while reloading fuel to the reactor vessel, an electrical perturbation initiated a control room ventilation isolation signal (CRVIS). The control room air conditioning system (CRACS) 'A' train A/C unit did not start upon the CRVIS due to a blown fuse. The 'B' CRACS A/C unit was out of service for planned maintenance at the time. At 1020 CDT, the 'A' train CRACS A/C unit was returned to service. Both trains of the control room emergency ventilation system (CREVS) were inoperable for 10 minutes. Due to both trains of CRACS and CREVS being inoperable, this condition is being reported as an eight-hour, non-emergency notification per 10 CFR 50.72(b)(3)(v).
This condition caused entry into technical specification (TS) limiting condition for operation (LCO) 3.7.10 condition `E' and 3.7.11 condition `D'. Upon discovery of the condition, fuel movement and core alterations were suspended in accordance with the TS LCO required actions.
There was no impact on the health and safety of the public or plant personnel. The NRC Resident Inspector was notified. |
| ML25267A030 | | 30 September 2025 | Fire Damper Functionality Ril Pdf Final | |
| 05000317/LER-2025-001, Control Room Loss of Ventilation Due to Smoke Detector Failure Causing Common Supply Damper to Shut | Calvert Cliffs | 29 September 2025 | Control Room Loss of Ventilation Due to Smoke Detector Failure Causing Common Supply Damper to Shut | |
| ML25153A008 | Byron
Braidwood | 21 August 2025 | Units, 1 and 2 - Issuance of Amendments to Revise Technical Specifications to Use Framatome Gaia Fuel (EPID L-2024-LLA-0072) (NON-PROPRIETARY) | |
| IR 05000390/2025002 | Watts Bar | 13 August 2025 | Integrated Inspection Report 05000390/2025002 and 05000391/2025002 | |
| IR 05000483/2025002 | Callaway | 11 August 2025 | Integrated Inspection Report 05000483/2025002 | |
| IR 05000250/2025002 | Turkey Point | 7 August 2025 | Inspection Report 05000250/2025002 and 05000251/2025002 | |
| IR 05000346/2025002 | Davis Besse | 7 August 2025 | Integrated Inspection Report 05000346/2025002 and Exercise of Enforcement Discretion | |
| ENS 57844 | Calvert Cliffs | 31 July 2025 21:44:00 | Both Trains of Control Room Emergency Ventilation/Control Room Emergency Temperature System Inoperable | The following information was provided by the licensee via phone and email:
At 1744 EDT, on 7/31/2025, it was discovered both trains of control room emergency ventilation (CREVS) and control room emergency temperature system (CRETS) were simultaneously inoperable due to a damper going shut in the control room ventilation system. The damper went back to its normal open position in less than a minute. Due to this inoperability, the system was in a condition that could have prevented the fulfillment of a safety function; therefore, this condition is being reported as an eight-hour, non-emergency notification per 10 CFR 50.72(b)(3)(v)(D). 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:
Multiple technical specification limiting conditions for operation (LCOs) such as LCO 3.0.3, 3.7.8, and 3.7.9 were entered as a result of this event. |