The Federation of Electric Power Companies of Japan has violated government policy by failing to compile a plan on how it intends to use the half ton of plutonium it expects to extract from spent fuel in fiscal 2012, sources said Saturday.

The deadline was March 31, when fiscal 2011 ended. Without a plan, Japan could come under international fire again for its blatant lack of transparency, given the risks of the plutonium being diverted for nuclear weapons use or terrorism.

Japan has around 30 tons of plutonium sitting around for nuclear power generation, but only a few kilograms are needed for a nuclear weapon.