Actuality and Technical Possibility of Refusal of Turbogenerators Hydrogen Cooling of Nuclear Power Plants

With the help of analysis of cooling type influence on the probability of turbogenerators unfailing operation for different power shown that a design complication and the use of new auxiliary systems for the cooling intensification with increasing power unit leads to the decrease in generators reliability. The main ways to ensure generators reliability are considered: implementation of systems and methods of control and diagnostics of main component parts, the reserve of important machinery systems as well as the simplification of generators design with simultaneous non-use a number of auxiliary systems. The advantages for application of full air cooling in comparison with hydrogen and hydrogen-water cooling are shown and also the need of refusal to use hydrogen cooling for powerful turbogenerators of nuclear power plants units is scientifically substantiated. On the base of analysis for domestic and world experience of design and operation of a power electrical machines with full air cooling shown that modern level of engineering and technologies allows building high-power turbogenerators with full air cooling for ensuring a fire and explosion safety of thermoelectric and nuclear power plants. In this case, it is necessary to reconsider the economic efficiency criterions towards the increase in reliability and the decrease in maintenance price.