By that standard, no energy source is carbon neutral since wind and solar also require mining and construction.

To our best estimate, the footprint of nuclear is a bit higher than solar and wind, but much closer to them than fossil fuels.

e.g.: https://www.carbonbrief.org/solar-wind-nuclear-amazingly-low...

Edit: see page 539 here for a better comparison https://www.ipcc.ch/site/assets/uploads/2018/02/ipcc_wg3_ar5...