OPERATING RELIABILITY OF GENERATING EQUIPMENT OF POWER UNITS OF NUCLEAR POWER PLANTS OF UKRAINE

Abstract

Statistic data analysis of effective operation of power units of Ukraine NPP has been performed. It has been determined part of unscheduled downtime of power units which occurs due to failures of turbine generators. It was considered indicators of reliability of three types of turbine generators which are used as part of power units of Ukrainian NPPs. Based on analysis of results it was found that in 2015-2019 the average reliability indicators of 1000 MW turbine generators, both two-pole and four-pole, do not fit the requirements of the current standards. The main types of damage are mentioned. The most dangerous between them is depressurization of the stator winding rods, the appearance of cracks in the intercoil bridges of the rotor winding, and hydrogen leakage in gas coolers. Possible reasons for malfunctions in the operation of elements and construction units and shortcomings of the systems control of the technical condition of machines were analyzed. It was proposed effective measures to improve the operational reliability of equipment. In particular, it is mentioned the necessity of introducing automated systems for continuous monitoring of hydrogen moisture in the turbine generator. References 6, table 3.