What do you mean by "dead technology"? It powers a large number of U.S. warships.
The military is given extra leeway in its decision making. There is no NIMBY for military projects. But, as for civilian power plants, we don't really build them in large numbers like we used to. In the 1950s, it was thought that every town would have its own nuclear powerplant, but that clearly didn't come to pass.
Not OP - but dead as in "not financially viable to add new grid capacity". Had we gone all in on nuclear 40 or 50 years ago, that might be a different story but alas. You can buy so much more solar + storage than nuclear capacity now, and the former has definite timelines and almost zero construction risk. The latter bankrupts whichever companies touch it.
Vogtle 3/4 saw negative learning rates (the second was more expensive to build than the first) and came in a decade behind schedule at over $20,000/KW. Enormous solar + storage projects are coming online at more like $2,500/KW. Their levelized cost is less than half the comparable cost to a nuclear plant without all the risk.