Steam Turbine/Generator Rotor Analysis

The ability to perform analysis of rotor NDE results allows utilities to gain a considerable advantage in rotor disposition, startup procedure control, and the scheduling of rotor reinspection intervals.

This course covers the multi-disciplinary aspects of rotor remaining life analysis concerning forging near-bore and blade attachment defects, and shrunk-on disk keyway cracking. Topics discussed include stress analysis, fracture mechanics, evaluation/interpretation of NDE data, the role of material properties, and available computational tools. Several case studies are presented

Remaining life evaluation methods for steam turbine and generator rotors are discussed and demonstrated in this two- or three-day course. This course includes instruction on performing transient thermal finite element analysis, critical crack size and subcritical crack growth analysis, and interpretation of nondestructive evaluation data. Designed primarily for users of the EPRI Safer-PC code, instruction for using ANSYS is also available.

COURSE OUTLINE

• Evaluation Overview
• Benefits of Rotor Evaluation
  • What Information is Required
    • How does it all fit together?
  • Geometry Description
    • Defining a Steam Turbine Rotor
    • Defining a Generator Rotor
  • Transient Evaluation
    • Definition of Boundary Conditions
    • Effects of Selected Parameters
  • Stress Recovery
    • Discussion of Techniques
    • How to Verify Your Work
  • Example Problem Discussion
• Fracture Mechanics Review
  • Review of the Basics
    • Critical Crack Size Evaluation
    • Subcritical Crack Growth Analysis
    • Material Property Effects
  • Evaluation of NDE Data
    • Interpretation Methods
  • Determination of Remaining Life
    • Deterministic and Probabilistic Methods
  • Example Problem Discussion
• Example Problem Discussion

ABOUT THE INSTRUCTOR:

Scott Rau - Scott leads SI’s efforts in the areas of rotor analysis. He has developed the PC-SAFER code for EPRI and has performed over 40 steam turbine rotor evaluations and more than 50 high energy piping evaluations.