The plutonium from a reactor is useless for a bomb, unless you seperate it in a large and complicated PUREX reprocessing plant (and run the reactor on an uneconomic cycle).  It's the PUREX plant that produces the raw material for weapons.  Read about the Integral Fast Reactor (IFR, Google will find enough references) to understand, how a breeder itself is no proliferation risk.  If anything, PUREX is.