The breakdown of the steam turbine is one of five major severe accidents referring to power outage across the plant, large-area power cuts, main equipment damage, fire and personal death and injury. Once the turbine is damaged, it will take a long time to repair and recover the power supply. The way of effective prevention or minimization of equipment damage is largely determined by the following factors: equipment maintenance and repair techniques, operational skills, and diagnosing and handling abilities of workers toward the accident. Workers are expected to discover and solve the problem timely and effectively. In fact, there are signs before most accidents. If those signs are discovered and handled in time, the accident will be prevented or at least the loss will be greatly reduced. On the contrary, if those signs are ignored owing to the lack of operational analysis of workers, severe equipment damage will be inevitable.