Metal Fatigue Management

Plant operation takes a toll on even the best-maintained systems, and cyclical stresses at nuclear power plants accelerate wear and tear on aging equipment. Utilities are required by federal law to manage the aging effects of metal fatigue on systems, structures, and components in all operating nuclear plants. Managing the effects of metal fatigue is particularly important for license renewal and extended operation.

Structural Integrity Associates (SI) offers customized solutions, providing strategies for managing the aging effects of metal fatigue. Informed by decades of experience in fatigue and other failure mechanisms, we will pinpoint limiting locations in your plant and work with you to design practical strategies to manage metal fatigue throughout the life of your plant.


With the use of our customized solutions, owners will extend the life of critical plant components with a blend of materials expertise, state-of-the-art technology, and both laboratory, and on-site evaluations. Our fatigue management services include:

  • Environmentally assisted fatigue (EAF) analysis
  • ASME Code Section III fatigue evaluations
  • Cycle and fatigue monitoring using FatiguePro 3 and SI:FatiguePro 4.0 software
  • License Renewal and Second License Renewal support
  • Fatigue Management Program consulting
  • Historical cycle counting reconstruction
  • Fatigue management handbooks
  • Fatigue repair support
  • Design modification to extend component life
  • Flaw tolerance and inspection services

As a leader in the field, we have developed SI:FatiguePro 4.0, innovative software that provides ASME code fatigue environmentally-assisted fatigue and cycle monitoring using existing plant instrumentation. This software is an improvement upon the EPRI-sponsored FatiguePro software. SI:FatiguePro 4.0 and its preceding versions are used in more nuclear plants worldwide than any comparable system.

Our fatigue management services can supply utilities with the tools to avoid costly replacements or augmented inspections of fatigue-sensitive components. In addition, our involvement in the majority of U.S. license renewal applications to-date has given SI first-hand knowledge of regulatory requirements related to fatigue management.


Our company has grown within the nuclear industry and is well-equipped to help aging plants manage fatigue and meet regulatory expectations. Along with a full menu of fatigue-related services, we offer training to help clients gain a deeper understanding of fatigue fundamentals and management based on ASME Code design rules, NRC regulations and industry best practices.

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