ENS 55034

v t e ENS Event
08:36 Dec 14, 2020
Title	Discovery of After-The-Fact Unusual Event - Inadvertent Release of Argon-41 Gas
Event Description	At 0336 EST, operators declared an Unusual Event due to elevated radioactivity levels observed at the facility's ventilation stack. The elevated levels were due to a release of Argon-41 gas caused by a failure of the facility's fan system. This failure caused the Argon gas to be released to the ventilation stack into the atmosphere. The reactor was operating at 19.5 MW at the time of the incident and was shutdown when the ventilation stack set point was reached. Facility personnel secured the offsite gas release and verified no fission product release occurred. The Unusual Event was terminated at 0422 EST.

ENS 55034 +/-
Where
National Inst Of Standards &Amp; Tech Gaithersburg, Maryland (NRC Region 0)
License number:	TR-5
Reporting
Emergency class:	Unusual Event
Other Unspec Reqmnt
Time - Person (Reporting Time:+5.98 h0.249 days <br />0.0356 weeks <br />0.00819 months <br />)
Opened:	Tom Newton 14:35 Dec 14, 2020
NRC Officer:	Brian Lin
Last Updated:	Dec 14, 2020
55034 - NRC Website
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v t e Emergency Notification System
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