Any water lost in the process can be made up by desalinated sea water added to the steam generator feed water. The water is pumped back to the steam generator and continues the cycle. Spent steam at low pressure runs through a condenser cooled by seawater and returns to liquid form. That water is converted to steam and passes through steam driers on its way to the steam turbine. The hot water from the reactor heats a separate water circuit in the steam generator. Water is circulated by pumps at lower power levels, reactors designed for submarines may rely on natural circulation of the water to reduce noise generated by the pumps. Any radioactive contamination in the primary water is confined. This circuit operates at a temperature of around 250 to 300 ☌ (482 to 572 ☏). A primary water circuit transfers heat generated from nuclear fission in the fuel to a steam generator this water is kept under pressure so it does not boil. Most naval nuclear reactors are of the pressurized water type, with the exception of a few attempts at using liquid sodium-cooled reactors. Power plants Basic operation of naval ship or submarine 1.1 Basic operation of naval ship or submarine.
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