Fracture phenomenon have been reported on blades, rotors, connections and rotor discs of LP turbines of nuclear power plants, which are caused by fatigue, stress corrosion and erosion. In this study, as a tool of reliability evaluation, stress and fracture analysis are performed on the defected area under various operating conditions using finite element methods. Possible defects on key-way and rotor disc are assumed as two-dimensional cracks and centrifugal force, temperature distribution and shrink-fit effect are included as external loads. From stress analysis results, stress intensity factors are obtained and used to evaluate reliability and predict remaining lifetime of the turbine discs.
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