Nuclear Power: Is anything like pic related actually happening??

No.12258437 ViewReplyOriginalReport
I don't get it, when is plutonium "spent"? Isn't it still hot and needs a long time to cool down? Isn't that heat exactly what is used to boil the water for power generation?

Is anything like pic related actually happening (i.e. only 3% turns into waste, the rest is recycled to be used again)?

Is this system really more cost effective and better than geothermal or geodynamic energy?