The article presents main results of the survey of the technical condition and the assessment of the strength and lifetime of the lower load-carrying of the hydrogenerator bracket with lifespan of more than 60 years and recommendations for the timely detection of cracks and strengthening of the structure in order to reduce the intensity of cracking; substantiates the necessity of updating the methodology for the index assessment of the technical condition of hydraulic units, which currently does not take into account the influence of cracks in supporting structures.

Keywords: crack, lower load-bearing generator bracket, non-destructive testing, remaining lifetime, technical condition index

For citation: Georgievskaiа E. V., Bashmakov А. О., Vasilchenko K. I. Fatigue cracks: random or regularity // Hydrotechnika. 2023. № 1. Pp. 2–9.