The main risk as I see it is that it may be much more difficult to develop a realistic power plant than hoped for, so the money put into research may not pay off
The biggest risk is the future of the by-product, which includes highly-radioactive fuel, containers, tools, decomissioned plants, and anything that comes into contact with fuel. Since this material...
No. It is an alternative to fossil fuels and is not exhaustible in real terms. It offers the best reduction in CO2 of anything out there, but is not a renewable.