After following the Vigil TV series (with all its reported errors) and also the prog on HMS Trenchard, when a Brit U-boat is powered by nuclear fuels, how do they condense the steam?
With sea water? If so, there must be difficulties in sealing the intakes and outfalls from deep sea pressures.
Perhaps the steam is heated to 200C and only cools to
100C through the turbines before recirculating so no condensing is required. This, of course, will be wasteful of some thermodynamic energy, but there's so much in reserve in the nuclear fual that perhaps it does not matter.