ENS 57987: Difference between revisions

v t e ENS Event
19:52 Oct 14, 2025
Title	Automatic Reactor Trip
Event Description	The following information was provided by the licensee via phone and email: At 1552 EDT on October 14, 2025, with Unit 1 in mode 1 at 100% power, the reactor automatically tripped due to a turbine trip. The trip was not complex with all systems responding normally post-trip. Operations responded and stabilized the plant. Decay heat is being removed by the emergency feedwater system. Due to the reactor protection system actuation while critical, this event is being reported as a 4-hour, non-emergency notification per 10 CFR 50.72(b)(2)(iv)(B) and an 8-hour, non-emergency notification per 10 CFR 50.72(b)(3)(iv)(A) for valid actuation of the reactor protection and emergency feedwater systems. There was no impact on the health and safety of the public or plant personnel. The NRC resident inspector has been notified. The following additional information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance: A generator field breaker lockout occurred. In addition, a small fire was observed in the generator field breaker and extinguished in less than 15 minutes by the onsite fire brigade. The unit is stable in hot standby with emergency feedwater and main condenser steam dumps in-service.

ENS 57987 +/-
Where
Summer South Carolina (NRC Region 2)
Reporting

10 CFR 50.72(b)(2)(iv)(B), RPS Actuation
Time - Person (Reporting Time:+-2.08 h-0.0867 days <br />-0.0124 weeks <br />-0.00285 months <br />)
Opened:	Lauren Anderson 17:47 Oct 14, 2025
NRC Officer:	Brian P. Smith
Last Updated:	Oct 14, 2025
57987 - 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 57987\u003C/a\u003E - \u003Ca href=\"/Summer\" title=\"Summer\"\u003ESummer\u003C/a\u003E\n\u003C/p\u003E\u003C/div\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003EAutomatic Reactor Trip\n\u003C/p\u003E\u003C/div\u003E","title":"ENS 57987 - Summer\n","link":"","lat":34.29653611111111,"lon":-81.31628333333333,"icon":"/w/images/6/6b/South_Carolina_Electric_%26_Gas_Company_icon.png"}],"imageoverlays":null}
v • d • e

v t e Emergency Notification System
Summer with 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation
WEEKMONTHYEAR2025-02-10T17:16:00 [Table view]
[ENS list for Summer]

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 The following additional information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance:
 A generator field breaker lockout occurred. In addition, a small fire was observed in the generator field breaker and extinguished in less than 15 minutes by the onsite fire brigade. The unit is stable in hot standby with emergency feedwater and main condenser steam dumps in-service.
-| URL = https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2025/20251015en.html#en57987
+| URL = https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2025/20251016en.html#en57987
 }}{{unit info
 | Unit = 1

Revision as of 06:20, 16 October 2025