Modeling And Computational Analysis On Stress Corrosion Life Prediction Of Low Pressure Rotor In Large Nuclear Power Turbine

The vital importance of safety running of nuclear power plant callsfor research on stress corrosion cracking (SCC) in nuclear power turbine.In the present work, the theory of SCC was studied, models to describe theprocess of SCC were developed and analyzed, formulas applicable tospecific environment and material were fitted. The temperature distributionand stress field of a shrink-on rotor was simulated by Finite ElementAnalysis (FEA). Given the environment and the results of FEA, SCC lifeof this rotor was assessed.The theory and methodology of SCC was studied and developed byreading a large quantity of papers and thesis. Clark model and Paris modelwere developed by deterministic approach while probabilistic lifeprediction model was developed by probabilistic approach. By comparingthe advantaged and disadvantages of the three models, Paris model andprobabilistic model were picked to assess the deterministic andprobabilistic life of the rotor, respectively.The temperature and stress distribution were calculated underelastic-plastic condition by ABAQUS software. Based on the results ofFEA, safety of both strength and torque transmission were checked. TheSCC sensitive area was determined as well.The crack propagation was calculated using Paris model while thefailure of rotor was acquired using probabilistic model. The deterministicand probabilistic lives of the rotor were assessed. Results show that themethodology developed agreed with the principle of SCC, which is of instructive significance to design and application of engineering.