COOK NUCLEAR PLANT ENTERS AND EXITS EMERGENCY PLAN AT LOWEST LEVEL FOR CONTROL ROOM ANNUNCIATOR FAILURE
BRIDGMAN, Mich., March 30, 2017 – Indiana Michigan Power’s Cook Nuclear Plant Unit 1 entered and exited its emergency plan at the lowest level this morning following the failure of a computer that runs an alarm system for the control room. An Unusual Event was declared at 3:10 a.m. when control room annunciators failed. The annunciator system monitors plant parameters and will alarm when the status of equipment or systems is outside pre-set limits. The system was restored in about three hours and the emergency plan was exited at 8:17 a.m.
An Unusual Event is the lowest of the four emergency classifications. It indicates a minor problem at the plant that varies from normal or routine operation. Federal, state and local authorities are notified.
The problem with the annunciators was determined to be a software issue with the computer controlling the annunciators. Both the primary and back-up systems were affected and subsequently restored when the systems were restarted.
Both units were at full power and remained stable during the activation. Even without the annunciators, Operators can still monitor plant parameters and maintain safe operation.
Cook Nuclear Plant is owned and operated by Indiana Michigan Power, headquartered in Fort Wayne. At full capacity, the 1,030-net MW Unit 1 and 1,077-net MW Unit 2 combined produce enough electricity for more than one and one half million average homes. Indiana Michigan Power is a wholly owned subsidiary of American Electric Power (NYSE:AEP), one of the largest electric utilities in the United States, delivering electricity and custom energy solutions to nearly 5.4 million customers in 11 states.