Reactor to propeller

From reactor to propeller

In the icebreakers each reactor heats water into steam, the steam spins turbo-generators, and electric motors turn the propellers. Most of the heat never reaches the water: between a tenth and a fifth of the reactors' thermal megawatts comes out at the shafts.

reactor heat, MW thermalpower at the propeller shafts, MW

How thick the ice can be

Level ice each class is rated to break, beside a person 1.8 m tall. Project 10510 is meant to go through 4 m.

3–4 yearsbetween refuellings, OK-900A (Arktika class)
7 yearsRITM-200 (Project 22220), over a 40-year life
10 yearsRITM-400 (Project 10510)

Reactors and shaft power from Wikipedia (Lenin: Russian article, 32.4 MW / 44,000 hp; Arktika class 55.3 MW; Taymyr 3 × 12 MW motors; Project 22220 60 MW; Project 10510 120 MW; Sevmorput 29,420 kW). Ice ratings from the same articles; Arktika class is given as 2–3 m, Lenin has none. Refuelling intervals: World Nuclear Association, Nuclear-Powered Ships (OK-900A, RITM-400); Wikipedia, Project 22220 (RITM-200).