ENS 57914
From kanterella
ENS Event | |
|---|---|
16:07 Sep 10, 2025 | |
| Title | Unusual Event - RCS Identified Leakage Greater than 25 Gpm for Greater than 15 Minutes |
| Event Description | The following information was provided by the licensee via phone and email:
At 1207 EDT on September 10, 2025, Oconee Nuclear Station Unit 1 declared an Unusual Event (SU5.1) due to identified reactor coolant system (RCS) leakage from Unit 1 for greater than 15 minutes. The calculated leak rate was 26 gallons per minute (gpm). The leakage was identified to be from letdown filter 1A, which was subsequently isolated. Units 2 and 3 remain at 100 percent power and are unaffected by this event. This event was terminated at 1353 after isolating the source of the leak. 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). |
| 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:+-3.68 h-0.153 days <br />-0.0219 weeks <br />-0.00504 months <br />) | |
| Opened: | Joshua Arnett 12:26 Sep 10, 2025 |
| NRC Officer: | Josue Ramirez |
| Last Updated: | Sep 10, 2025 |
| 57914 - NRC Website
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WEEKMONTHYEARENS 579142025-09-10T16:07:00010 September 2025 16:07:00
[Table view]10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event - RCS Identified Leakage Greater than 25 Gpm for Greater than 15 Minutes ENS 577112025-05-15T22:28:00015 May 2025 22:28:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event - Loss of All Offsite Power ENS 557332022-02-05T08:57:0005 February 2022 08:57:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Declared Due to Visual Observation of Smoke and Multiple Fire Alarms in the West Penetration Room ENS 533962018-05-10T20:17:00010 May 2018 20:17:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Notification of Unusual Event ENS 517702016-03-06T20:20:0006 March 2016 20:20:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Emergency Declaration Due to Fire/Explosion in the Main Transformer ENS 510262015-04-30T22:40:00030 April 2015 22:40:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Declared Due to Electrical Fault ENS 461672010-08-11T16:07:00011 August 2010 16:07:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unit 3 Declared an Unusual Event Due to Loss of Annunciators ENS 411372004-10-20T02:10:00020 October 2004 02:10:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Declared Due to Unexplained Decrease in Spent Fuel Pool Water Level ENS 404242004-01-03T01:38:0003 January 2004 01:38:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unit 1 Declared an Unusual Event Due to 14 Gpm Unidentified Rcs Leakage 2025-09-10T16:07:00 | |
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