The only way it's "economically viable" is to not do it safely/properly, or to not clear up completely afterwards (no government has done so yet, can't see 'em starting now!)- witness the fact that the government is already trying to hide many of the true costs so as to make it appear viable. There were reports around 6 years ago that very comprehensively dismissed nukes on several grounds - the ONLY reason they are back on the agenda is because of the strength of the incredibly well-funded and connected lobbyists , (as personified in *Ancient Brewer's "lobbyists lines"), and a degree of desperation by uninformed (or
bribed incentivised members of government to gain "green brownie points" - Nukes are no way renewable, sustainable, or green!
One wonders how much the UK equivalent of China's "50 cent army" get paid to spam fora with their pro-nuke disinformation and "positive spin"

I'm not directly involved in Nuclear nor in any way a lobbyist. At times I am ambivalent towards atomic power. I am currently in Brewing, shortly moving over into Oil and Gas in the Gulf region.
Will be interesting to see if Aramco really do hook up a Nuc to this baby to provide all the process heat, Desal and Electricity. Very efficient use of both electrical and thermal output.
http://en.wikipedia.org/wiki/Ras_TanuraOne hell of an engineering project that's for sure.