How to make a Nuclear Test Facility

To create a nuclear testing facility, you need to make something like the "A Basic Testing Facility" image.

A Basic Testing Facility

This can be achieved by making four cells, the walls made of "Wall." Make small to medium piles of Uranium. The floating yellow cudes above the Uranium are Cloners. These, well, the clone things. Next, place a Neutron on the cloner. The cloner should make a ton of them. When these hit Uranium, it heats it up. When it hits ~300 C, it will explode. This is a nuclear meltdown. And there ya have it. A basic nuke test area. You're welcome.