ENS 57711: Difference between revisions

v t e ENS Event
22:28 May 15, 2025
Title	Unusual Event - Loss of All Offsite Power
Event Description	The following information was provided by the licensee via phone and email: At time 1828 EDT on 5/15/25, Oconee declared an Unusual Event (SU1.1) due to a loss of all offsite power for greater than 15 minutes. This occurred when the site lost their startup transformers (CT 2&3). At the time of the event, the site was restoring from switchyard maintenance and was experiencing a loss of their overhead powerline from the Keowee Hydropower Station. The underground powerline remains operable as a source of emergency power. Units 1, 2, and 3 remain at 100 percent power with Unit 1 being unaffected by this event. Units 2 and 3 are being powered by their auxiliary transformers. 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). * * UPDATE ON 5/16/2025 AT 0052 EDT FROM ALAN HOGLEN TO SAMUEL COLVARD * * * At time 0045, on 5/16/25, Oconee terminated their Unusual Event (SU1.1) due to restoring offsite power (CT 2&3 have been restored). The NRC Senior Resident Inspector has been informed. Notified R2DO (Desai), IR MOC (Grant), NRR EO (Felts). External notifications: DHS SWO, FEMA Operations Center, CISA Central Watch Officer, FEMA NWC, DHS Nuclear SSA (email), CWMD Watch Desk (email).

ENS 57711 +/-
Where
Oconee South Carolina (NRC Region 2)
Reporting
Emergency class:	Unusual Event
10 CFR 50.72(a) (1) (i), Emergency Class Declaration
Time - Person (Reporting Time:+-3.57 h-0.149 days <br />-0.0212 weeks <br />-0.00489 months <br />)
Opened:	Alan Hoglen 18:54 May 15, 2025
NRC Officer:	Jordan Wingate
Last Updated:	May 16, 2025
57711 - NRC Website Loading map... {"minzoom":false,"maxzoom":false,"mappingservice":"leaflet","width":"350px","height":"250px","centre":false,"title":"","label":"","icon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"zoom":6,"defzoom":14,"layers":["OpenStreetMap"],"image layers":[],"overlays":[],"resizable":false,"fullscreen":false,"scrollwheelzoom":true,"cluster":false,"clustermaxzoom":20,"clusterzoomonclick":true,"clustermaxradius":80,"clusterspiderfy":true,"geojson":"","clicktarget":"","imageLayers":[],"locations":[{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca class=\"mw-selflink selflink\"\u003EENS 57711\u003C/a\u003E - \u003Ca href=\"/Oconee\" title=\"Oconee\"\u003EOconee\u003C/a\u003E\n\u003C/p\u003E\u003C/div\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003EUnusual Event - Loss of All Offsite Power\n\u003C/p\u003E\u003C/div\u003E","title":"ENS 57711 - Oconee\n","link":"","lat":34.79336388888889,"lon":-82.89360555555555,"icon":"/w/images/7/75/Duke_Energy_icon.png"}],"imageoverlays":null}
v • d • e

v t e Emergency Notification System
Oconee with 10 CFR 50.72(a)(1)(i), Emergency Class Declaration
WEEKMONTHYEAR2025-09-10T16:07:00 [Table view]
[ENS list for Oconee]

@@ Line 27: / Line 27: @@
 Notified R2DO (Desai), IR MOC (Grant), NRR EO (Felts).
 External notifications: 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/2025/20250516en.html#en57711
+| URL = https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2025/20250519en.html#en57711
 }}{{unit info
 | Unit = 2

Latest revision as of 06:20, 19 May 2025