May 16 (Reuters) - AMERICAN ELECTRIC POWER COMPANY INC'S ( AEP )

INDIANA MICHIGAN POWER:

* SAYS COOK PLANT'S UNIT 2 WAS RETURNED TO SERVICE,

CONNECTING TO

THE GRID AT 4:04 P.M., THURSDAY MAY 16

* SAYS POWER REDUCED TO 25%, IT WAS ULTIMATELY DETERMINED

THAT THE

REACTOR ALSO NEEDED TO BE REMOVED FROM SERVICE TO REPAIR THE

LEAK

* SAYS OPERATORS SAFELY MANUALLY TRIPPED THE REACTOR TO

BEGIN THE

REPAIR PROCESS

* SAYS UNIT 1 REMAINED AT 100% POWER FOR THE DURATION OF THE

UNIT

2 REPAIR, AND THERE WAS NO IMPACT TO CUSTOMER SERVICE

* SAYS THE ROOT CAUSE OF THE UNIT 2 STEAM LEAK IS STILL

BEING

DETERMINED

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