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Nuclear Event – Potential Uncontrolled Radiation Release: Clinton Power Station, Unit 1, Illinois

2016/06/27

Technological Hazard –  Nuclear Event

North America – USA | State of Illinois, Clinton, Clinton Power Station, Unit 1
Location: 40°10’20.0″N 88°50’06.0″W
Present Operational Age: ~29 years
Emergency Level: POT UNCNTRL RAD REL/LOSS OF SECONDARY CONTAINMENT

Nuclear Event in USA on Friday, 24 June, 2016 at 15:11 [CDT].

LOSS OF SECONDARY CONTAINMENT

“On 06/24/2016 at 1511(CDT), an unexpected trip of a Fuel Building ventilation supply fan occurred followed by an exhaust fan trip and secondary containment differential pressure became positive.

“At 1512 (CDT), the standby fuel building ventilation fans auto started and secondary containment differential pressure was restored to Technical Specification required conditions.

“Secondary containment was declared INOPERABLE when Technical Specification-required differential pressure was not being maintained and LCO 3.6.4.1 Action A.1 was entered and exited for the given time period. Emergency Operating Procedure (EOP) – 8 was entered due to Secondary containment differential pressure reading positive (greater than 0 inches of water).

“This loss of secondary containment is reportable under 10CFR 50.72(b)(3)(v)(C) as an event or condition that could have prevented fulfillment of a safety function needed to control the release of radioactive material.

“The cause of the fuel building supply fan trip is under investigation. The NRC Resident Inspector has been informed.”

Source: NRC  Event Number: 52043

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Previous Event

Nuclear Event in USA on Wednesday, 30 March, 2016 at 15:45 [CDT]. SECONDARY CONTAINMENT DIFFERENTIAL PRESSURE OUTSIDE REQUIRED TECHNICAL SPECIFICATION VALUE

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