ENS 48175
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ENS Event | |
|---|---|
12:48 Aug 10, 2012 | |
| Title | Unusual Event Declared Due to Toxic Gas Release |
| Event Description | At 0848 EDT, on 8/10/12, Watts Bar declared an Notification of Unusual Event (NOUE), EAL Tab 4.4, based on access restrictions to the turbine building due to a toxic gas release (Ammonia). The leak has been secured. Operators are currently in protective gear in the turbine building in an effort to ventilate the residual gas from all affected areas and re-establish normal access. The gas release has caused no personnel injuries or equipment damage. The licensee continues to operation at 100% power.
Watts Bar will remain in an NOUE until the area can be ventilated and normal access is reestablished. The NRC Resident Inspector will be notified. The licensee has notified state and local government. Notified DHS SWO, FEMA OPS, DHS NICC, and NUCLEARSSA via email.
At 1325 EDT Watts Bar terminated the Notification of Unusual Event (NOUE). The Ammonia leak was due to a valve in the fill line to the Ammonia Mixing Tank not being fully closed, thereby causing the tank to overflow. The NRC Resident Inspector has been notified. Notified R2DO (Rich), NRREO (Evans), IRD MOC (Marshall). Notified DHS SWO, FEMA OPS, DHS NICC, and NUCLEARSSA via email. |
| Where | |
|---|---|
Watts Bar  Tennessee (NRC Region 2) | |
| Reporting | |
| Emergency class: | Unusual Event |
| 10 CFR 50.72(a) (1) (i), Emergency Class Declaration | |
| Time - Person (Reporting Time:+-3.85 h-0.16 days <br />-0.0229 weeks <br />-0.00527 months <br />) | |
| Opened: | Matthew Miller 08:57 Aug 10, 2012 |
| NRC Officer: | John Shoemaker |
| Last Updated: | Aug 10, 2012 |
| 48175 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 568092023-10-21T13:07:00021 October 2023 13:07:00
[Table view]10 CFR 50.72(a)(1)(i), Emergency Class Declaration Notification of Unusual Event Declared ENS 545312020-02-19T14:57:00019 February 2020 14:57:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration ENS 522102016-08-31T01:20:00031 August 2016 01:20:00 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)(iv)(A), System Actuation Notice of Unusual Event - Fire in a Main Bank Transformer ENS 517802016-03-09T08:42:0009 March 2016 08:42:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Declared Due to a Fire Greater than 15 Minutes ENS 489502013-04-21T06:11:00021 April 2013 06:11:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Notification of Unusual Event Due to Shots Fired within the Owner Controlled Area ENS 481752012-08-10T12:48:00010 August 2012 12:48:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Declared Due to Toxic Gas Release ENS 473482011-10-18T00:50:00018 October 2011 00:50:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unit 1 Declared an Unusual Event Based on Ammonia Levels Exceeding Osha Limits ENS 430022006-11-21T11:15:00021 November 2006 11:15:00 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 Unidentified Leakage 2023-10-21T13:07:00 | |
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