Fast reactors will also be able to transmute their own minor actinides. What is left takes 200 years to reach the radioactive level of natural uranium versus ten thousand years for conventional nuclear waste. The BN-1200 concept is essentially a further developed BN-800 design with the twin goals of being more economically attractive while also meeting Generation IV reactor safety limits. To improve economics, it uses a new fueling procedure that is simpler than the one on the BN-600 and BN-800 designs, and has an extended design lifetime of 60 years. Safety enhancements are the elimination of outer primary circuit sodium pipelines and a passive emergency heat removal.