well the point was actually to make a power plant instead of an actual full scale reactor but if I do it will be out of scale compared to the rest of the plant, unlike the old powder toy were there was no uranium for plutonium to turn into and yo could just clone plutonium in a container and put neutrons, you have to do some thing like this https://powdertoy.co.uk/Utilities/Utility.GetScreenshot.php?ID=3374&Size=large and separate the plutonium source from the fission section, or did you simply wanted me to make a full scale reactor?