The OK-900A is a pressurized water reactor, meaning that cooling water is continually pumped under pressure through the reactor to remove heat, keeping the cores and the reactor cool. The heated water is pumped from the reactor to a boiler (four boilers per reactor), where it transfers its heat into another body of water, producing steam at a rate of 30 kgf/cm2 (2.94 MPa, or approximately 1,084 psi). Each set of four boilers drives two steam turbines, which turn three dynamos. One kilovolt of direct current is then delivered to three double-wound motors directly connected to the propeller, providing an average screw velocity of 120-180 rpm. Five auxiliary steam turbines are tied into the plant to provide electricity, turning generators with a cumulative electric power of 10 MW.