This paper devoted to the analysis of the residual imperfection of NPP’s equipment in conditions of the uncertainty. The paper discusses the concept of residual defects in the equipment, causes and consequences of undiagnosed defects. The determination of quantitative assessment of residual defects was given. Was shown it’s conformity with the basic criteria of reliability and safety of nuclear power plants equipment. Also, the basic concepts of uncertainty control, causes and consequences of its occurrence in the evaluation of residual defects in nuclear power plant equipment were considered.
the reliability, a safety, residual imperfection, uncertainty of control, field inspection, criteria of reliability, NPP’s equipment