The issues start with turbine unit 2 where it has encountered a problem for a long time before the accident in 2009. The problem first appeared after installation in 1979, after that during year 1980 to 1983; there many issue and problems related with seals, vibration of the turbine shaft, and bearings arise.From late March to late November 2000, the complete recovery turbine 2 was performed. Cavities up to 12 millimeters (0.47 in) and cracked up to 130 millimeters (5.10 in) long was found in the turbine wheel and repaired. Many other defects found in the turbine