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Nuclear Event – Potential Uncontrolled Radiation Release: Dresden Nuclear Power Station, Illinois
Technological Hazard – Potential Uncontrolled Radiation Release
Nuclear Event in USA on Tuesday, 09 February, 2016 at 21:42 [CST]
SECONDARY CONTAINMENT INOPERABLE
“At 2142 [CST] on February 9, 2016, Reactor Building differential pressure did not meet the required 0.25 inches of vacuum water gauge due to failure of the control system. At 2205, the Unit 3 Reactor Building Ventilation System was secured and manually isolated. The Reactor Building differential pressure returned to [greater than or equal to] 0.25 inches of vacuum water gauge at 2207.
“This condition represents a failure to meet Surveillance Requirement 184.108.40.206.1. As a result, entry into Technical Specifications 220.127.116.11 condition A was made due to Secondary Containment being inoperable. This event is being reported in accordance with 10 CFR 50.72(b)(3)(v)(C) as a condition that could have prevented the fulfillment of a safety function.
“The NRC Resident Inspector has been notified.”