ROSATOM’s machine-building division Atomenergomash AEM-technology Atommash Volgodonsk branch of JSC has produced of the first steam generator for the second power unit of Akkuyu NPP under construction in Turkey. The manufacturing cycle of a steam generator includes assembly-welding of vessels from separate shells and nozzles, manufacturing of heads, drilling of the primary circuit headers, manufacturing of coils and installation of internals, as well as a set of control measures. The final operation is hydraulic and vacuum tests of the heat exchanger. All holes of the steam generator were previously closed with special plugs. Then the primary and secondary circuits were filled with distilled water. The circuits of the steam generator are examined in turn. Specialists supply pressure of 24.5 MPa (243 atmospheres) to the primary circuit zone, while the water temperature is 350 degrees Celsius. The secondary circuit receives pressure of 11.45 MPa (115 atmospheres), while the water is heated to 300 degrees. Both indicators are 1.4 times higher than the operating pressure.During the tests, the first steam generator for Akkuyu NPP has confirmed the strength and density of the base metal and welds of the elements of steam generator with supports.Steam generator is a heat-exchange apparatus that is a part of the reactor facility and belongs to the items of the first safety class. The diameter of the apparatus is more than 4 meters, its length is about 15 meters, and its weight is 340 tons. The equipment for one power unit of NPP includes four steam generators.