ENS 57673
ENS Event | |
|---|---|
04:28 Apr 20, 2025 | |
| Title | |
| Event Description | The following information was provided by the licensee via phone and email:
At 0028 EDT on 4/20/2025, it was discovered that all trains of the ECCS accumulators were simultaneously inoperable. Therefore, this condition is being reported as an eight-hour, non-emergency notification per 10 CFR 50.72(b)(3)(v). The safety function was restored at 0028 on 04/20/2025 and all required trains have been declared operable. There was no impact to the other unit. 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: The sample lines for each accumulator cold leg were open for inspection, which crossties the cold leg accumulator gas spaces. Upon discovery of this condition, the sample lines were subsequently closed, and the accumulators were declared operable.
The following information was provided by the licensee via phone and email: This report retracts the 8-hour notification made on April 20, 2025, for NRC Event 57673. NRC Event 57673 describes a condition at McGuire Nuclear Station Unit 1 where all trains of ECCS accumulators were declared inoperable. This condition was reported in accordance with 10CFR 50.72(b)(3)(v)(D) as a condition that could have prevented the fulfillment of a safety function to mitigate the consequences of an accident. Upon further engineering review, all four ECCS accumulators were operable and would have performed their specified safety functions with all four nuclear sampling system (inside containment) isolation valves open, concurrent with the most limiting large break loss of coolant accident and worst-case single failure. Therefore, this event is not reportable as an event or condition that could have prevented the fulfillment of a safety function and is hereby retracted. There was no impact on the health and safety of the public or plant personnel. The NRC Resident Inspector has been notified. Notified R2DO (Franke) |
| Where | |
|---|---|
McGuire  North Carolina (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
| Time - Person (Reporting Time:+3.55 h0.148 days <br />0.0211 weeks <br />0.00486 months <br />) | |
| Opened: | Just Selepec 08:01 Apr 20, 2025 |
| NRC Officer: | Ian Howard |
| Last Updated: | May 8, 2025 |
| 57673 - NRC Website
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