ENS 45577
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ENS Event | |
|---|---|
19:15 Dec 16, 2009 | |
| Title | Manual Reactor Trip Following a Failure of the Steam Dump System |
| Event Description | VC Summer Nuclear Station (VCSNS) was performing a preplanned turbine shutdown in order to perform maintenance on a faulty turbine control valve. After the manual turbine trip, the steam dump system failed to operate and the crew manually tripped the reactor. The cause of the failure of the steam dump system is unknown, and is currently being investigated. Both motor driven Emergency Feedwater pumps were manually started at 40% Steam Generator Level. Preliminary review indicates all other primary and secondary systems responded as required. The plant is in mode 3 at normal RCS [Reactor Coolant System] pressure and temperature. Decay heat is being removed by dumping steam via the secondary [steam generator] power operated relief valves. The station will remain in mode 3 until repairs are complete. Estimated restart date has not been determined.
All rods fully inserted. There is no known primary to secondary leakage. Off site power supply configuration is normal. The turbine trip was performed at 45% power due to a stuck open turbine control valve. The licensee has notified the NRC Resident Inspector and will notify state and local contacts. |
| Where | |
|---|---|
Summer  South Carolina (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(2)(iv)(B), RPS Actuation 10 CFR 50.72(b)(3)(iv)(A), System Actuation | |
| Time - Person (Reporting Time:+-1.75 h-0.0729 days <br />-0.0104 weeks <br />-0.0024 months <br />) | |
| Opened: | Jason Weathersby 17:30 Dec 16, 2009 |
| NRC Officer: | Karl Diederich |
| Last Updated: | Dec 16, 2009 |
| 45577 - NRC Website | |
Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | Yes, Manual Scram |
| Before | Power Operation (45 %) |
| After | Hot Standby (0 %) |
Summer with 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation | |
WEEKMONTHYEARENS 569782024-02-19T07:36:00019 February 2024 07:36:00
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