The ocean is the ULTIMATE closing argument against the naysayers who claim that we'll soon run out of uranium. The fact that with the IFR we can live essentially forever (God Willing) without this source is really unimportant.
If the Japanese are concerned about pumping power to move seawater past their adsorbers, a fast reactor does that free gratis -- at least twice as much dissolved uranium passes through the CCW in a year as is required to keep the plant running. Screens can be placed downstream, and that is the end of the problem of energy supply to the world -- forever, Amen.
Even if the recovered uranium were priced at half the price of gold, this would not change the price of electricity even by one cent per kwh if fast reactors are used. As a wrap-up, the earth's rivers continuously replenish the ocean's uranium - and the ocean bottom does the same by leaching from the rock.