Almost every producer can, there are some processing steps before shipping (uranium is generally shipped as yellowcake), but for the most part it's pretty straightforward mining.
> Do we have stockpiles?
I'd expect most nuclear countries to have both a stockpile and a strategic reserve (especially if they use uranium in other contexts than civil energy).
For reference France has a 2 years stockpile and a 5 years strategic reserve. A country like germany which is trying to get out of nuclear might have reduced their stockpile to waste less money (as they'd have to resell it).
Almost every producer can, there are some processing steps before shipping (uranium is generally shipped as yellowcake), but for the most part it's pretty straightforward mining.
> Do we have stockpiles?
I'd expect most nuclear countries to have both a stockpile and a strategic reserve (especially if they use uranium in other contexts than civil energy).
For reference France has a 2 years stockpile and a 5 years strategic reserve. A country like germany which is trying to get out of nuclear might have reduced their stockpile to waste less money (as they'd have to resell it).