Re: Ooooo, aren't we feeling arrogant today What's ridiculous? Ok: Scale, stability (there is none), spikes of energy dissipated out from the core, fuel burnout, reaction poisons. Why would there be any low Z elements in the core when they would've, according to you and suggestions of buoyancy, floated to outside the core? This is a BIG point. It wouldn't be steady state because steady state is not the nature of nuclear reactions. Given conditions suggested here, you'd have a giant supercritical reactor that would reach some ridiculously large power output in a matter of nanoseconds. This is because power increases in a fission reactor exponentially. This is why it'd be a giant bomb. This is true for a man-made reactor. Our reactors are carefully constructed and don't have the right geometry or material distribution to be a bomb. That's why they melt down instead of exploding. For the scale we're talking about, such considerations go out the window. The limiting factor in how big we can make a fission bomb is how big a mass (well, two masses) of concentrated fissile nuclei (Pu-239, U-235, et al) we can make before the masses are bombs themselves. Eventually they would, but they would be a poison for as long as they're there, and that could be awhile. Creation of such poisons on such a scale would (at best) yield some seriously squirrley (spikey) behavior that would be violently shaking the planet quite often. I have no reason to believe that there would be anything but VERY uniform material distribution in the core, given how old the earth is. Heat and material movement might matter on a human scale reactor, but not this size. I'm sure there's some very interesting natural mechanisms for material transport, but nothing that would regulate the reactor as you're suggesting. It really all depends on if and how you mix waste. Generally, nuclear power doesn't generate much besides some high level waste (spent fuel) and some short lived low level wastes from reactor operation. The reason it is impossible to exactly determine what's in those mixes is because decay chains have more than one possible path. However we can tell with pretty good certainty what should and shouldn't be there. There are a shitload of rules for doing this and they're followed quite rigidly. Don't get these ideas of leaky barrels of waste killing children at playgrounds get to your head. The only irresponsible waste disposal done that I know of was by the government (for weapons development and production during the cold war) before people started getting on their asses. Such messes have nothing to do with present nuclear power production and are nothing I wish to associate myself with. No problem. How's this: Please Register or Log in to view the hidden image! This is me.