ENS 42104
ENS Event | |
---|---|
03:27 Nov 1, 2005 | |
Title | Unusual Event Declaration: Loss of Offsite Power Due to Loss of Startup Transformer |
Event Description | Unusual event category 10A on Unit 4. Loss of offsite power to Unit 4 due to loss of Unit 4 Startup Transformer. Auto AFW actuation. Auto starting and loading of both Unit 4 Emergency Diesel Generators.
The licensee stated that the plant is stable in Mode 3 at approximately 700 psi and 380 deg F. The plant was experiencing electrical grid instabilities at the time of the trip of the Startup Transformer. The exact cause of the transformer trip is being investigated. The grid instabilities were associated with the plant's Northwest Bus, therefore, Unit 3 is not affected and continues to operate at approximately 60% power. The licensee notified the State of Florida and will notify the NRC Resident Inspector
The licensee terminated from their Unusual Event (EAL 10A) at 0200 EST on 11/02/05. Unit 4 A & B 4 KV busses are now powered from off-site power using Unit 4 startup transformer." The power / mode for Unit 4 is now 0% power / Mode 5. The licensee will notify the NRC Resident Inspector and has notified State, local and other government agencies. Notified R2DO (Ayres), NRR EO (Case), IRD-MOC (Wilson), DHS (J. Frost) and FEMA (S. Kimbrell). |
Where | |
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Turkey Point ![]() Florida (NRC Region 2) | |
Reporting | |
Emergency class: | Unusual Event |
10 CFR 50.72(a) (1) (i), Emergency Class Declaration 10 CFR 50.72(b)(3)(iv)(A), System Actuation | |
Time - Person (Reporting Time:+-4.42 h-0.184 days <br />-0.0263 weeks <br />-0.00605 months <br />) | |
Opened: | David Funk 23:02 Oct 31, 2005 |
NRC Officer: | Mike Ripley |
Last Updated: | Nov 2, 2005 |
42104 - NRC Website
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Unit 4 | |
---|---|
Reactor critical | Not Critical |
Scram | No |
Before | Hot Standby (0 %) |
After | Hot Standby (0 %) |
Turkey Point ![]() | |
WEEKMONTHYEARENS 568132023-10-25T01:59:00025 October 2023 01:59:00
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