Plutonium

Concern focuses around two reactors at the Yongbyon Nuclear Scientific Research Center, both of them small power stations using Magnox techniques. The smaller (5MWe) was completed in 1986 and has since produced possibly 8,000 spent fuel elements. Construction of the larger plant (50MWe) commenced in 1984 but in 2003 was still incomplete. This larger plant is based on the declassified blueprints of the Calder Hall power reactors used to produce plutonium for the UK nuclear weapons program. The smaller plant produces enough material to build one new bomb per year; if completed, the larger plant could produce enough for 10 each year [3]. It has also been suggested that small amounts of plutonium could have been produced in a Russian-supplied IRT-2000 heavy water–moderated research reactor completed in 1967, but there are no recorded safeguards violations with respect to this plant.

On March 12, 1993, North Korea said that it planned to withdraw from the Nuclear Non-Proliferation Treaty (NPT) and refused to allow inspectors access to its nuclear sites. By 1994, the United States believed that North Korea had enough reprocessed plutonium to produce about 10 bombs with the amount of plutonium increasing. Faced with diplomatic pressure and the threat of American military air strikes against the reactor, North Korea agreed to dismantle its plutonium program as part of the Agreed Framework in which South Korea and the United States would provide North Korea with light water reactors and fuel oil until those reactors could be completed. Because the light water reactors would require enriched uranium to be imported from outside North Korea, the amount of reactor fuel and waste could be more easily tracked, making it more difficult to divert nuclear waste to be reprocessed into plutonium. However, with bureaucratic red tape and political obstacles from the North Korea, the Korean Peninsula Energy Development Organization (KEDO, established to advance the implementation of the Agreed Framework, had failed to build the promised light water reactors and in late 2002, North Korea returned to using its old reactors.

Source : http://en.wikipedia.org