ENS 48175

v t e 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. * * UPDATE FROM NEWTON LACY TO JOHN KNOKE AT 1331 EDT ON 08/10/12 * * * 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.

ENS 48175 +/-
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
v • d • e

v t e Emergency Notification System
Watts Bar with 10 CFR 50.72(a)(1)(i), Emergency Class Declaration
WEEKMONTHYEAR2023-10-21T13:07:00 [Table view]
[ENS list for Watts Bar]

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