What nuclear fission reactor design has the least environmental impact?

[ensabah6]

What nuclear fission reactor design has the least environmental impact? Including the building, operating, safety, and amount of pollution produced?

I'd imagine IFR/breeder reactors as they burn actinides.

 

[rdt2]

Current thoughts on where nuclear reactors are going are summarised at http://en.wikipedia.org/wiki/Generation_IV_reactor . Obviously, environmental impact is one factor in this but not the only one.