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Nuclear Event – Manual Reactor SCRAM (Unusual Event/Emergency Declared): Cook Nuclear Plant, Michigan

2016/07/06

Technological Hazard  – Nuclear Event

North America – USA | State of Michigan, Bridgman, D.C. Cook Nuclear Generating Station (Unit 2)
Location: 41°58’31.4″N 86°33’57.3″W
Present Operational Age: ~40 years
Event: UNUSUAL EVENT/EMERGENCY DECLARED

Nuclear Event in USA on Wednesday, 06 July, 2016 at 00:38 [EDT].

MANUAL REACTOR TRIP AND UNUSUAL EVENT DECLARATION DUE TO STEAM LEAK IN TURBINE BUILDING

“On July 6, 2016, at 0038 [EDT], DC Cook Unit 2 Reactor was manually tripped and at 0050 [EDT] an Unusual Event (N-7 ‘Unanticipated Explosion’) Emergency Declaration was made due to steam leak and associated damage to the turbine building.

“In accordance with Emergency Plan procedures, notifications of Berrien County and State of Michigan were completed. The licensee has notified the NRC Senior Resident Inspector. The Unusual Event was terminated at 0207 [EDT].

“This notification is being made in accordance with 10 CFR 50.72 (a)(1)(i) due to declaration of an emergency class. Original notification to NRC made at 0100 EDT via ENS. This event is reportable under 10 CFR 50.72(b)(2)(iv)(B), Reactor Protection System (RPS) actuation and 10 CFR 50.72(b)(2)(xi) Offsite Notification, as a four (4) hour report, and under 10 CFR 50.72(b)(3)(iv)(A), specified system actuation of the Auxiliary Feedwater System, as an eight (8) hour report. The DC Cook NRC Resident Inspector has been notified. Press release is planned.

“Unit 2 is being supplied by offsite power. All control rods fully inserted. Decay heat is being removed via Steam Generator PORVs [Power Operated Relief Valve]. Preliminary evaluation indicates all plant systems functioned normally following the Reactor Trip. DC Cook Unit 2 remains stable in Mode 3 while conducting the Post Trip Review. No radioactive release is in progress as a result of this event.”

Notified DHS SWO, FEMA Ops Center, DHS NICC. Notified FEMA National Watch and Nuclear SSA via email.

Source: NRC  Event Number: 52065


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