Was the basic research funded by governments? Yes. Is subsidization necessary or even done for nuclear powerplants to be built and profitably run given that basic research as an already-existing stepping stone? No.
As already answered: https://www.ucsusa.org/resources/nuclear-power-still-not-via...
I don't think we should be subsidizing power (or most things) but it seems disingenuous for an article to claim that nuclear power isn't viable because it gets subsidies, even tho fossil fuel gets at least as much subsidies per mwh as nuclear.
Coal and oil still get huge subsidies, yet even with are not viable against solar and wind without.