Location of prototype fast breeder reactor?

Answer:
The advantage is mainly that more active fuel can be created than is used, so getting 'something for nothing'. However experimental reactors such as the sodium cooled fast reactor at Dounreay in Scotland have proved very difficult in practice, with material problems, and as far as I know such experiments are in abeyance at the moment.
First answer by ID1257056239. Last edit by Knapp1. Contributor trust: 685 [recommend contributor recommended]. Question popularity: 3 [recommend question].