Nuclear was perfectly affordable until laws were passed to make it unaffordable (specifically: if nuclear power happened to be cheaper than other energy sources for any reason, then it was considered to be not spending enough on safety, so it was required to spend money on marginal safety measures until it cost the same as other forms of energy).
Nuclear was, in fact, never cost-effective. No civil power nuke has ever been operated, anywhere in the world, without utter dependence on massive public subsidy.
Nukes get less competitive every day. Lately, already paid-for nukes are about on par with fresh-built solar or wind,big you neglect the disaster liability subsidy. But wind and solar costs are still falling.
