ENS 53922
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ENS Event | |
|---|---|
05:12 Mar 10, 2019 | |
| Title | Notice of Unusual Event Due to Loss of Offsite Power |
| Event Description | At 0012 EST on 3/10/2019, Browns Ferry Unit-3 declared an Unusual Event due to a spurious trip of the generator breaker, resulting in a loss of AC power to the 4 kV shutdown boards greater than 15 minutes. All diesel generators started and loaded to supply onsite power. The reactor auto-scrammed, with all rods fully inserting. The Main Steam Isolation Valves opened and shutdown cooling was being conducted via the condenser. The licensee will exit the emergency declaration once offsite power is restored. There is no estimated restart date.
Browns Ferry Unit 1 remains in Mode-1 (100%), Unit 2 remains in Mode-5 for a refueling outage. The NRC Resident Inspector has been notified. This event is related to EN 53923. Notified DHS SWO, FEMA Operations Center, DHS NICC, FEMA NWC (email), DHS Nuclear SSA (email), and FEMA NRCC SASC (email).
At 1310 CDT, Browns Ferry Unit-3 exited the Unusual Event when 161 kV lines were made available. The licensee is executing procedures for securing the diesel generators while alternate offsite power methods are utilized. Switchyard damage evaluation is in progress. The licensee will notify the NRC Resident Inspector. Notified R2DO (Desai), R2RA (Haney), DNRR (Nieh), NRR EO (Miller), and IRD (Grant). Notified DHS SWO, FEMA Operations Center, DHS NICC, FEMA NWC (email), DHS Nuclear SSA (email), and FEMA NRCC SASC (email). |
| Where | |
|---|---|
Browns Ferry  Alabama (NRC Region 2) | |
| Reporting | |
| Emergency class: | Unusual Event |
| 10 CFR 50.72(a) (1) (i), Emergency Class Declaration | |
| Time - Person (Reporting Time:+-4.4 h-0.183 days <br />-0.0262 weeks <br />-0.00603 months <br />) | |
| Opened: | David Hall 00:48 Mar 10, 2019 |
| NRC Officer: | Ossy Font |
| Last Updated: | Mar 10, 2019 |
| 53922 - NRC Website
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Unit 3 | |
|---|---|
| Reactor critical | Critical |
| Scram | A/R |
| Before | Power Operation (100 %) |
| After | Hot Shutdown (0 %) |
WEEKMONTHYEARENS 558182022-04-02T18:45:0002 April 2022 18:45:00
[Table view]10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Declared Due to a Fire at the 3B Reactor Feedwater Pump ENS 539222019-03-10T05:12:00010 March 2019 05:12:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Notice of Unusual Event Due to Loss of Offsite Power ENS 535582018-08-22T05:00:00022 August 2018 05:00:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Notification of Unusual Event Declared Due to Fire ENS 534622018-06-20T05:00:00020 June 2018 05:00:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Notification of Unusual Event Declared Due to Toxic Gas Release ENS 532472018-03-07T17:05:0007 March 2018 17:05:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Notification of Unusual Event Declared ENS 525872017-03-02T18:30:0002 March 2017 18:30:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Notification of Unusual Event Declared ENS 518502016-04-06T20:45:0006 April 2016 20:45:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Declared Due to Main Steamline High High Radiation Condition ENS 467932011-04-27T22:01:00027 April 2011 22:01:00 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)(xiii), Loss of Emergency Preparedness Notification of Unusual Event Due to Loss of Offsite Power 2022-04-02T18:45:00 | |
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