IT WAS I WHO ATTEMPTED THIS!
And yeah it's not the same thing as SM rads, SM rads irradiate things, Uranium does not, or it does, but in a different way. I'm going to flick through over january before my Uni course starts and see if I can pick apart why, and then try and code a reactor.
Basic idea for it is
Plasteel to make a reactor floor; uranium to make fuel rods; then you have to insert the rods into the reactor floor to generate power, check temperature and radiation levels.
Then instead of it exploding, a meltdown would be increasing waves of radiation that cause a greater and greater 'sphere' of an irradiated area outside the reactor. Or Hell, I'll just try and code a radioactive gas it emits. May as well give it a go, because fuck SM.