Reactor compartment is the main part of NPP power unit. It is a hermetically protected place, a solid structure of steel and concrete, wherein there is a nuclear reactor. The main reactor task is to generate power released through splitting atoms of uranium isotope U-235 and to convert it into electric power.

It is designed to cool the core under conditions of primary coolant loss accident, and it consists of three subsystems: passive injection system with hydraulic accumulators, active injection system with high-lift pumps and active injection system with low-lift pumps.

This is a heat-exchange apparatus to produce water steam with pressure exceeding the atmospheric one due to heat of the primary coolant coming from the nuclear reactor.

Feed pumps are applied to pump the chemically purified water to steam generators.

Circulation pump is necessary to supply (to pump) cooling water for the condensation system.

NPP separator-superheators (SSH) are designed to dry and superheat steam, which comes from high-pressure cylinder of the saturated steam supplied turbine.

This is a heat engine, wherein steam energy is converted into mechanical work.

This is a synchronous generator, which operates in tandem with a turbine. Its main function is to convert mechanical energy of the steam or gas turbine into electrical one.

RCPS is designed to circulate coolant in the primary circuit of NPP reactor plant, and it has an additional function to ensure the coolant circulation and reactor cooling in case of blackout.