In a pressurised water reactor, the steam generators act as heat exchangers where water carrying heat generated from the nuclear reaction is used to turn demineralised water into steam.
Rosenergoatom said the 355-tonne component was manufactured by an Atommash factory in Volgodonsk, southwest Russia.
The company said installation work for the set of four steam generators at Kursk 2-1 is scheduled to be carried out in May and June this year.
The two new units under construction at the site of the existing Kursk nuclear power station will be the first of the VVER-TOI pressurised water reactor type. Construction of Kursk 2-1 began in April 2018 and of Kursk 2-2 in April 2019.
The VVER-TOI technology was developed from the 1,200 MW AES-2006 pressurised water reactor.