ENS 57603
ENS Event | |
|---|---|
23:02 Mar 13, 2025 | |
| Title | Unusual Event - Loss of Offsite Power |
| Event Description | The following information was provided by the licensee via phone and email:
At 1902 EDT on 3/13/2025 Turkey Point Nuclear Plant Unit 4 declared an Unusual Event due to a loss of offsite power [to the '4B' 4KV bus]. The '4B' 4KV bus was re-energized from the '4B' emergency diesel generator (EDG). The '4A' 4KV bus is de-energized as part of the pre-planned outage scope. The cause of the loss of Unit 4 startup transformer is not known at this time. All plant parameters are stable. State and local agencies were notified. The NRC resident inspector has been notified. Notified DHS SWO, FEMA Operations Center, CISA Central Watch Officer, FEMA NWC, DHS Nuclear SSA (email), CWMD Watch Desk (email). The following additional information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance: The licensee is evaluating the startup transformer before transferring the '4B' 4KV bus back to offsite power. Spent fuel pool cooling remained in-service as it was powered from Unit 3. Unit 3 was unaffected and remains at 100 percent power.
At 2056 EDT on 3/13/2025, Turkey Point Nuclear Station Unit 4 terminated the Unusual Event due to a loss of offsite power. The event was terminated due to more than one emergency power source being available; `4B' emergency diesel generator and `4D' bus station blackout tie. Notified R2DO (Pearson), DHS SWO, FEMA Operations Center, CISA Central Watch Officer, FEMA NWC, DHS Nuclear SSA (email), CWMD Watch Desk (email).
Turkey Point Nuclear Station Unit 4 is retracting this notification based on additional information not immediately identified at the time of notification. Following the loss of the '4B' 4kV bus event on 3/13/25, the emergency action level (EAL) technical bases document for CU2.1 was reviewed and identified that more than one emergency power source was still available at the time of the event and could have been credited. Specifically, the '4B' EDG and the '4D' bus station blackout cross tie (powered by Unit 3) emergency power sources were still available. The initial report was based on the available information at the time pursuant to emergency declaration and reporting notification requirements. The NRC Resident has been notified. Notified R2DO (Pearson), Region 2 RA (Miller), NRR (Bowman). IR MOC (Crouch), Region 2 PAO (Gasperson), NRR EO (Felts), and NSIR (Erlanger) |
| Where | |
|---|---|
Turkey Point  Florida (NRC Region 2) | |
| Reporting | |
| Emergency class: | Unusual Event |
| 10 CFR 50.72(a) (1) (i), Emergency Class Declaration | |
| LER: | 05000251/LER-2025-002-01 Emergency Diesel Generator Actuation |
| Time - Person (Reporting Time:+-3.37 h-0.14 days <br />-0.0201 weeks <br />-0.00462 months <br />) | |
| Opened: | Steve Murano 19:40 Mar 13, 2025 |
| NRC Officer: | Robert A. Thompson |
| Last Updated: | Mar 14, 2025 |
| 57603 - NRC Website
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WEEKMONTHYEARENS 577732025-06-21T18:38:00021 June 2025 18:38:00
[Table view]10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Unusual Event - Unit 4 Containment Isolation Failure Due to Bus Lockout ENS 576032025-03-13T23:02:00013 March 2025 23:02:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event - Loss of Offsite Power ENS 562642022-12-08T19:02:0008 December 2022 19:02:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Due to Excessive Reactor Coolant System Leakage ENS 551532021-03-25T01:29:00025 March 2021 01:29:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Notice of Unusual Event Declared Due to Fire Alarm in Containment ENS 529522017-09-08T03:14:0008 September 2017 03:14:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Notification of Unusual Event - Hurricane Warning ENS 526212017-03-18T15:19:00018 March 2017 15:19:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Alert Declared for Indications of Fire in Safety Related Switchgear ENS 489482013-04-19T21:20:00019 April 2013 21:20:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Unusual Event Due to Loss of Offsite Power Greater than 15 Minutes ENS 477972012-04-02T23:33:0002 April 2012 23:33:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event - Fire from Hydrogen Supply to Volume Control Tank ENS 421042005-11-01T03:27:0001 November 2005 03:27:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Unusual Event Declaration: Loss of Offsite Power Due to Loss of Startup Transformer ENS 420782005-10-26T01:40:00026 October 2005 01:40:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Declared Due to a Small Fire at the Main Turbine Area ENS 420672005-10-23T02:54:00023 October 2005 02:54:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Declared Due to Hurricane Wilma ENS 420012005-09-19T15:04:00019 September 2005 15:04:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Declared Due to Hurricane Rita ENS 419432005-08-25T03:04:00025 August 2005 03:04:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Declared Due to Hurricane Warning ENS 418002005-06-27T07:16:00027 June 2005 07:16:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Declaration of an Unusual Event Due Transformer Fire >10 Minutes ENS 417432005-06-03T04:33:0003 June 2005 04:33:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Declared Unusual Event Due to Rcs Leakage in Excess of Technical Specification Limit ENS 410682004-09-24T21:00:00024 September 2004 21:00:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Declared Due to Hurricane Warning ENS 410072004-09-02T14:56:0002 September 2004 14:56:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Notification of Unusual Event Declared 2025-06-21T18:38:00 | |