ENS 45404
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ENS Event | |
|---|---|
10:49 Oct 2, 2009 | |
| Title | Automatic Reactor Trip on Turbine Trip Possibly Caused by a Faulted Main Generator Breaker |
| Event Description | At 0649 [EDT] The VC Summer Nuclear Station automatically tripped due to a turbine trip. The cause of turbine trip is under investigation. Preliminary review indicates a possible failure of one phase of the main generator breaker. The three emergency feedwater pumps automatically started on Lo-Lo steam generator level. Preliminary review indicates all primary and secondary systems responded as required.
The plant is in mode 3 with normal RCS pressure and temperature. Decay heat is being removed by dumping steam to the condenser. The station will remain in mode 3 until repairs are complete. Estimated restart date has not been determined. All control rods fully inserted. The plant is in a normal post-trip electrical lineup with the exception of the balance of plant buses which are on the alternate electrical source. The licensee will inform State and local agencies and has informed the NRC Resident Inspector. |
| 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:+-0.35 h-0.0146 days <br />-0.00208 weeks <br />-4.7943e-4 months <br />) | |
| Opened: | Jason Weathersby 10:28 Oct 2, 2009 |
| NRC Officer: | Steve Sandin |
| Last Updated: | Oct 2, 2009 |
| 45404 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | A/R |
| Before | Power Operation (100 %) |
| 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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