ENS 57928: Difference between revisions
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Latest revision as of 22:03, 23 September 2025
ENS Event | |
|---|---|
21:04 Sep 13, 2025 | |
| Title | Manual Reactor Scram |
| Event Description | The following information was provided by the licensee via phone and email:
On September 13, 2025, at 1704 EDT, with Unit 2 in mode 1 at 70 percent power performing main turbine testing, the Unit 2 reactor was manually tripped due to loss of both reactor recirculation pumps. Due to the power level at the time, closure of containment isolation valves (CIVs) in multiple systems occurred, as a result of reaching the actuation setpoint on reactor water level, as designed. The trip was not complex, with all safety systems responding normally post-trip. Operations responded and stabilized the plant. Normal reactor level and pressure control systems are controlling as expected. Decay heat is being removed by discharging steam to the main condenser using turbine bypass valves. Unit 1 is not affected. The reactor protection system actuation while critical is being reported as a four-hour, non-emergency notification per 10 CFR 50.72(b)(2)(iv)(B). Additionally, the event is being reported as an eight-hour non-emergency notification per 10 CFR 50.72(b)(3)(iv)(A) as an event that results in a valid actuation of CIVs. 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: Main turbine control valve testing was in progress when the reactor recirculation pumps tripped. |
| Where | |
|---|---|
Hatch  Georgia (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(2)(iv)(B), RPS Actuation | |
| Time - Person (Reporting Time:+-0.88 h-0.0367 days <br />-0.00524 weeks <br />-0.00121 months <br />) | |
| Opened: | Michael Torrance 20:11 Sep 13, 2025 |
| NRC Officer: | Robert A. Thompson |
| Last Updated: | Sep 13, 2025 |
| 57928 - NRC Website
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