Courtesy Reuters

The past two years have brought radical changes in the nonproliferation policies of the Unites States and a massive international study of proliferation issues. Impending commitments to new nuclear power technologies threaten to give many nations quick access to weapons-usable material, and this prospect has thrust the issue of power-cycle technology and materials, and their control, to the center of proliferation concerns. There is a general desire to achieve a proper balance between the possible benefits of new nuclear systems and the attendant proliferation risks. But there is disagreement, here and abroad, about how to strike this balance, and what

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