We have discussed this before. Nuclear Energy is not Zero Carbon emissions. In fact Nuclear energy carbon emissions are around 1/2 to indeterminate of that of coal.
We have to look at the Carbon emissions from well to wheel of petroleum products, and the same applies for Nuclear Power too. Since, nuclear mining is closely guarded, there is no way of knowing how much water pollution and Carbon emissions results from mining and concentrating Nuclear fuels.
The cite below calculated CO2 emissions from Nuclear Power to be half of Natural gas. The cite did not consider water pollution from nuclear fuel mining which is severe in many parts of the world.
Nuclear is a great fuel option, but it is just one of the things to fight climate change and it comes with other tradeoffs.