It is less efficient as a weapons fuel but can still be used to make bombs.

Experts said it would be the first time the government has moved nuclear weapons fuel to reduce the risk of terrorists stealing it.

It claims to have reprocessed 8,000 spent fuel rods from that reactor into weapons fuel.

The reason is that some weapons fuel, which is highly enriched, is diluted for reactor use.

They have asked that a promised $400 million in American aid for nuclear dismantling go to help build a huge bunker for retired weapons fuels.

Once enriched, uranium can be used for weapons fuel.

North Korea responded by restarting the plant that fabricates weapons fuel.

The vital security objective all along has been to prevent Iran from acquiring the capacity to make nuclear weapons fuel.

He also said the department would reduce the number of places where weapons fuel is stored.

At the usually off-limits nuclear research complex, he said he saw no evidence that the weapons fuel had been made.