EXPERIENCE OF CREATION AND OPERATION OF HORIZONTAL AND VERTICAL TYPES STEAM GENERATORS FOR NPP
The work purpose is development of recommendations on creation of the steam generators for the promising Russian NPP power units with VVER wide range of electric power, including 1500-1800 MW. Analysis of the Russian experience in the design and operation of horizontal steam generators VVER-440 and VVER-1000 has been done in the article. There is discuss physical processes and design features associated with the failure of steam generators: the development of cracks, damage cold the collectors of the coolant, small stocks and fluctuations of water level in the second circuit. There is described negative processes in the development of foreign vertical steam generators with beams of U-shaped tubes, the lower ends of which are seamed into the tube board: stress corrosion cracking of the walls of the tubes, denting upon evaporation of water in the gaps between the heat exchange tubes of the beam and hole spacing gratings. Based on the analysis of foreign experience of operation of steam generators of the vertical type, the conclusion about the feasibility of creating an alternative to the horizontal type of the Russian model of the steam generator vertical layout, which can be prototype of serial devices.