The D200 turbine offers a robust architecture in which the steam first expands in a double-flow HP path. After moisture separation and reheat, it then expands in four or six LP flows .The turbine rotors, all of monoblock construction, are rigidly coupled to each other and to the generator rotor.
Each rotor is supported by a pair of journal bearings.
The HP model is the rightful heir of the most powerful 3,000 rpm turbines with saturated steam in operation in UK and China (with more than 770,000 hours of operation), and uses impulse-type blading and features six stages to increase both global efficiency and final power output. HP steam exhausts are connected to the moisture separator reheater (MSR) by four cross-under pipes. This design allows servicing of the turbine without disassembling the exhaust pipes.