Enter the IAEA web page, there you will find that not even IAEA rhinks of nuclear energy as a replacement. Thats because uranium reserves arent infinite. Once conventional uranium mines run out of uranium, we will have to go for the non conventional ones and prices will go up the paradigm IAEA professes is nuclear is excellent as a transition techonology (they also include natural gas as a transition techonology) to a fully renewable energy market.
Also, its generally not advisable to have more than a 10% of nuclear energy.