The primary scientist supplying data to the anti-nuclear activists is M.Z. Jacobson and his mode of operation can be summarised as "always assume the worst case for nuclear, and the best case for renewables".
For example:
"New nuclear power plants cost 2.3 to 7.4times thoseof onshore wind or utility solar PVper kWh, take 5 to 17years longer between planning and operation, and produce 9 to 37 times the emissions per kWh as wind"
Source: https://web.stanford.edu/group/efmh/jacobson/Articles/I/NuclearVsWWS.pdf