How to solve the Fukushima incident? I am trying to find out if it is somehow possible to take all this nuclear material, put it in some type of gamma chamber or blast it with neutrons to change the uranium isotopes into something harmless.  Somehow neutralize the entire reaction.  
It seems that if we can create enriched uranium, then we should be able to do something in the opposite direction.  Even if a single chamber of this sort cost a hundred billion dollars, if it was able to neutralize all the spent nuclear waste across the world within a year, it would be well worthwhile for governments and organizations to invest.
Perhaps teams of grant and proposal writers to put this into reality as soon as possible.
 A: The simple answer to your question is, No, we cannot do anything to the three reactor coriums because, to date, noone knows where the three coriums created by the meltdowns are located.  Robots sent into the hot buildings are simply consumed by the radiation and are still in there, immobile.  No human, even in the radiation suits, can survive more than a few minutes and would come out, virtually dead.  Borehole cameras were consumed until fiber optic cameras that stay outside the intense radiation inside the buildings were used.  These can only look down into the very outside rooms of the buildings.  Looking for meters-deep cooling water, they only find cm deep water.  The intensely radioactive water, obviously, runs right out of the building into the ground and into the Pacific, which has, or soon will, kill it.  Lots of your practical answers can be found on enenews.com every day.  The hundreds of tanks of highly radioactive cooling water now stored in tanks all over Fuku's property have a continuous Bremsstrahlung radiation all around them.  It is increasing, alarmingly, and nothing is done about it.  Japan and Tepco denials are ignored lies, even by the Japanese people.
One can only hope the genius of physics that created this problem will, before it consumes us all, be brought to bear on solving this disaster.  Three years of inaction is criminal.
