| Autors: Dimova, G. T. Title: Conducting Assessments for Fast Fracture of Nuclear Reactor Metal Keywords: Nuclear Power Plant, Metal Embrittlement, Ageing, Stress Int Abstract: Nuclear power plants must be safe, reliable and ensure the planned supply of electricity. The metal of the equipment operates in conditions of high values of hydraulic pressure of the fluid, high temperatures and radiation exposure, fatigue, corrosion and wear. The metal is subjected to mechanisms of degradation of mechanical properties. It is known that each of these mechanisms was studied separately from the others, in laboratory conditions. There is no data on the synergistic interaction of the various mechanisms of degradation in real operating conditions of a nuclear power plant. Defects appear in the structure and this leads to a decrease in the operability of the equipment and to compromise the NPP safety. By visual, capillary and ultrasonic control,defects are recorded and dimensioned, but their development cannot be predicted until the next periodic operational control. In practice, those mechanical characteristics of the metal, which can lead to the danger of brittle fractu References Issue
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