PRAISE was originally developed in 1981 to provide a probabilistic tool for the analysis of fatigue crack growth or pre-existing cracklike defects in commercial light water reactor piping. PRAISE is an acronym for Piping Reliability Analysis Including Seismic Events, and seismic events are considered as part of the cyclic stresses that grow fatigue cracks.

PRAISE has since gone through several enhancements, including a pc version, fatigue crack initiation, a Windows version for ease of use and inclusion of initiation and growth of pressurized water stress corrosion cracking (PWSCC). beyond-PRAISE is PRAISE that has been rewritten and restructured to provide numerous expansions and enhancements.

Major advancements:

  • Validated in accordance with Structural Integrity's Quality Assurance Program which is in compliance with the requirements of 10CFR50 Appendix B, 10CFR21, ANSI/ASME NQA-1-1989 and 1994, and meets the intent of applicable portions of ANSI N45.2
  • Capability to separate inherent randomness (aleatory) from uncertainty due to lack of knowledge (epistemic) per Draft Regulatory Guide DG-1226
  • Most current stress intensity factor and J-integral solutions
  • Service bending and tension loads (rather than all tension)
  • Inclusion of time-dependent material properties
  • Expanded inspection model that included sizing uncertainty and repair
  • Inside surface wall thinning, such as due to flow accelerated corrosion (FAC)
  • Selective lifetime calculation for reduction of computer time
  • Modular and object-oriented construction for ease of future changes, written using C# programming language, batch run capability using multiple processors