ENS 53462
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ENS Event | |
|---|---|
05:00 Jun 20, 2018 | |
| Title | Notification of Unusual Event Declared Due to Toxic Gas Release |
| Event Description | On June 20, 2018 at 1003 CDT, the licensee declared a Notification of Unusual Event based on Emergency Action Level (EAL) 6.5.U, toxic gas release on site.
The Notification of Unusual Event was terminated at 1025 CDT. The toxic gas release occurred when site personnel were filling a fire suppression carbon dioxide (CO2) tank outside the diesel generator building. The relief valve in the common diesel generator room for Unit 1 and 2 diesel generators inadvertently lifted causing a toxic gas environment by releasing CO2 into the room. The licensee terminated the tank fill stopping the release of CO2, and with the door to the room being opened, the gas cleared in about 20 minutes. The licensee has notified the NRC Resident Inspector. Notified DHS SWO, FEMA Ops, DHS NICC, FEMA NWC (email) and NuclearSSA (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:+6.65 h0.277 days <br />0.0396 weeks <br />0.00911 months <br />) | |
| Opened: | Mark Moebes 11:39 Jun 20, 2018 |
| NRC Officer: | Richard Smith |
| Last Updated: | Jun 20, 2018 |
| 53462 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
Unit 3 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (94 %) |
| After | Power Operation (94 %) |
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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