XPost: uk.d-i-y   
   From: briang1@blueyonder.co.uk   
      
   I would have thought that using sea water would be very difficult, due to   
   the corrosion it might create in the heat exchanger, or whatever they use to   
   cool the water. Besides, if heat from water changed as the sub moved, surely   
   it would be detectable quit easily by the other side.   
    There have been some terrible depictions of nuclear reactors in films and   
   TV shows over the years. The one in The world is not Enough is pretty stupid   
   in my view. I cannot see it of course but the audio describer explained the   
   end scene and he sounded almost embarrassed at the situation.   
      
   I would have thought that many reactors these days that needed to be small   
   may well use some other material to get the heat away to do the work. Sodium   
   perhaps, though let that come in contact with water and you have a very bad   
   day.   
    Brian   
      
   --   
      
   This newsgroup posting comes to you directly from...   
   The Sofa of Brian Gaff...   
   briang1@blueyonder.co.uk   
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   Note this Signature is meaningless.!   
   "nightjar"  wrote in message   
   news:usydnd3WzLwPx978nZ2dnUU78dfNnZ2d@giganews.com...   
   > On 16/09/2021 14:49, gareth evans wrote:   
   >> 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?   
   >   
   > Sea water heat exchanger   
   >   
   >> With sea water? If so, there must be difficulties   
   >> in sealing the intakes and outfalls from deep sea   
   >> pressures.   
   >   
   > The main engineering problem seems to be keeping it from making detectable   
   > noise while the boat is running in quiet mode.   
   >   
   >>   
   >> 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.   
   >>   
   >   
   >   
   > --   
   > Colin Bignell   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)