Justifying the Vibration Resistance of Pipelines of NPPS

Resumo

The NP-096-15 regulations require the design documentation for NPP pipelines to justify life characteristics and life evaluation criteria and to provide monitoring of such characteristics of pipelines during their entire service life. A review of strength design regulations regarding the justification of the vibration resistance of NPP pipelines shows that the evaluation of their damage is based on a limited spectrum of dynamic stress amplitudes, which affects the accuracy of the evaluation of cyclic strength. Amethodological approach to the justification of the vibration resistance of pipelines is developed and tested in industrial conditions. The approach is based on a stress-based failure criterion and a mathematical model describing the vibrations of pipelines with allowance made for the effect of the flow on the wall based on the local isotropic theory of turbulence.