U.S. and Russian officials have laid out a plan for the implementation of a long-delayed program to dispose of 34 metric tons of surplus Russian plutonium, the Energy Department announced yesterday. Russian Federal Atomic Energy Agency (Rosatom) officials will begin irradiating portions of the weapon-grade plutonium, converted into mixed-oxide fuel, at the BN-600 reactor of the Beloyarsk nuclear power plant complex starting "in the 2012 time frame," according to a joint U.S.-Russian statement. An additional reactor of the type BN-800...