When they erect the turbines, they spend some time with the rotor locked. Locked seldom means zero movement, could a slight rocking back and forth cause surface failure in those spots.
The blades must have some creep, meaning that when they are first spun there will be some out of balance. This could overload the bearing and make it fail.
Rod
The blades must have some creep, meaning that when they are first spun there will be some out of balance. This could overload the bearing and make it fail.
Rod