ENS 57977
ENS Event | |
|---|---|
05:00 Oct 10, 2025 | |
| Title | Manual Reactor Trip |
| Event Description | The following information was provided by the licensee via phone and email:
At 0100 EDT, on 10/10/2025, with McGuire Unit 2 in mode 1 at 5 percent power, the reactor was manually tripped due to an approximate 4 gpm leak associated with the chemical and volume control system. The motor driven auxiliary feedwater pumps were manually started due to anticipation of automatic actuation. The trip was uncomplicated with all systems responding normally post-trip. Due to the reactor protection system actuation while critical and manual start of the motor driven auxiliary feedwater pumps, this event is being reported as a four-hour, non-emergency notification per 10 CFR 50.72(b)(2)(iv)(B), and an eight-hour system actuation per 50.72(b)(3)(iv)(A). At 0211 on 10/10/25, it was determined the required train of the refueling water storage tank was inoperable due to insufficient borated water volume; therefore, this condition is also being reported as an eight-hour, non-emergency notification per 10 CFR 50.72(b)(3)(v). The safety function was restored at 0249 on 10/10/2025 and the required train has 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: Decay heat is being removed via steam dump valves to the main condenser, and the auxiliary feedwater system. The cause of the leak is being investigated. |
| Where | |
|---|---|
McGuire  North Carolina (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(2)(iv)(B), RPS Actuation | |
| Time - Person (Reporting Time:+-0.25 h-0.0104 days <br />-0.00149 weeks <br />-3.4245e-4 months <br />) | |
| Opened: | Michael Grembecki 04:45 Oct 10, 2025 |
| NRC Officer: | Ian Howard |
| Last Updated: | Oct 10, 2025 |
| 57977 - NRC Website
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Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | Yes, Manual Scram |
| Before | (5 %) |
| After | (0 %) |
WEEKMONTHYEARENS 579772025-10-10T05:00:00010 October 2025 05:00:00
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