ENS 57603: Difference between revisions
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| emergency class = Unusual Event | | emergency class = Unusual Event | ||
| notification date = 03/13/2025 19:40 | | notification date = 03/13/2025 19:40 | ||
| retracted = Yes | |||
| notification by = Steve Murano | | notification by = Steve Murano | ||
| NRC officer = Robert A. Thompson | | NRC officer = Robert A. Thompson | ||
| Line 18: | Line 19: | ||
| title = Unusual Event - Loss of Offsite Power | | title = Unusual Event - Loss of Offsite Power | ||
| event text = The following information was provided by the licensee via phone and email: | | event text = 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. 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. | 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. | 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). | Notified DHS SWO, FEMA Operations Center, CISA Central Watch Officer, FEMA NWC, DHS Nuclear SSA (email), CWMD Watch Desk (email). | ||
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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. | 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. | ||
* * * UPDATE ON 03/13/2025 AT 2318 EDT FROM DANIEL BITTNER TO KERBY SCALES * * * | * * * UPDATE ON 03/13/2025 AT 2318 EDT FROM DANIEL BITTNER TO KERBY SCALES * * * | ||
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 ` | 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). | Notified R2DO (Pearson), DHS SWO, FEMA Operations Center, CISA Central Watch Officer, FEMA NWC, DHS Nuclear SSA (email), CWMD Watch Desk (email). | ||
| URL = https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2025/ | * * * RETRACTION ON 03/14/2025 AT 0518 EDT FROM DANIEL BITTNER TO JORDAN WINGATE * * * | ||
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) | |||
| URL = https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2025/20250317en.html#en57603 | |||
}}{{unit info | }}{{unit info | ||
| Unit = 4 | | Unit = 4 | ||
Latest revision as of 06:20, 17 March 2025
| 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
| |