Quote:
The reactor core of an S6G (26MWe) submarine nuclear power plant (just the vessel that holds the fuel and the fuel itself) weighs about 110 +/-3 tons. It needs 20000 gallons (80 tons) of water for coolant. After you add in the rest of its systems you are looking at at least 1000 tons of machinery. The reactor fits in a space about 10m long, 10m wide, and 12m tall. Two hundred times more space than the Hyperion Reactor. The S6G is rated at about 130 megawatts thermal power. The electric output is 26 megawatts.
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http://nextbigfuture.com/2008/10/pow...aspect-of.html
So several rail-cars minimum for transport. Plus the need for heavy cranes.