51.   Japan immediately withdrew support for a multinational effort to build two nuclear reactors in North Korea, replacing one suspected of producing plutonium for atomic weapons.

52.   Kaurich said he later learned that the uranium was sent to a nuclear plant in Washington state, where it was used to produce plutonium for bombs.

53.   Liquid sodium is used as a coolant for fast-breeder nuclear reactors, which produce more plutonium than they consume.

54.   North Korea is suspected of producing plutonium for nuclear weapons at its experimental reactor before agreeing with the United States last October to have the reactor replaced.

55.   North Korea has threatened to reactivate its nuclear facilities, which are suspected of producing enough plutonium for at least two nuclear bombs.

56.   Opponents say the breeder reactor, which produces more plutonium than it uses, is unsafe and unwise.

57.   Opponents say the reactors, which produce more plutonium than they consume, are expensive and difficult to run.

58.   Several other countries have dropped or cut back plans for such reactors because of the hazards and costs of producing the plutonium.

59.   Such reactors produce more plutonium than they burn.

60.   The accord calls for North Korea to freeze and eventually dismantle its nuclear facilties, which were suspected of being used to produce plutonium for nuclear weapons.