[dragonwriter]

> The success of the water cooled competitor eventually led to the predominance of water cooled reactors in the commercial fleet.

By commercial you mean operational (as in non-experimental Navy vessels.) There's precious few commercial nuclear vessels in history (four, each from a different country and I don't think they were ever operational all at the same time), so talking about the dominance of a particular nuclear technology being dominant in a “commercial fleet” seems misplaced.

[acidburnNSA]

I meant to refer to the commercial fleet of commercial nuclear power plants making electricity on land, almost all of which have designs directly descended from naval designs. I guess "fleet" isn't a great word to use in the context of naval vessels. Whoops!

[brandmeyer]

Its not commonly known, but the initial generation of commercial power reactors in the US is basically the result of technology transfer from the Naval Nuclear Propulsion program.