So the main constraint on Iran going nuclear is the availability of fissile material.
To make the fissile material, he needs to develop an ability to enrich uranium.
They set out a four-year timetable to gather up and secure bomb-usable fissile material.
Why would North Korea refrain from selling Iran either fissile material or a crude nuclear weapon?
First, ending the stalemates on the Fissile Material Cut-off Treaty and the Comprehensive Nuclear Test Ban Treaty.
Fissile material in this form is difficult to use in a weapons program, U.S. and European officials say.
North Korea is thought to have enough plutonium-based fissile material for as many as a dozen small bombs.
Fissile material in this form is difficult to use in a weapons program, U.S. and European officials said.
North Korea revealed a uranium-enrichment facility at the plant in 2010, another route to provide fissile material for nuclear weapons.
By this time, he said, Tehran will have amassed enough fissile material to quickly assemble one or more atomic weapons.
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He also wants to jump-start long-stalled negotiations on a verifiable treaty to end the production of fissile material for military uses.
Argentina, Italy and the United Arab Emirates said they were working to install radiation detectors to check cargo for fissile material.
Al-Qaeda and other militant groups are known to be desperate to get their hands on fissile material or an assembled warhead.
Acquiring nuclear weapons requires three elements: fissile material (such as highly enriched uranium, HEU, or plutonium), a delivery system and a warhead.
One reason why many people distrust nuclear power is because they believe it is impossible to separate civil reactors from weapons-grade fissile material.
P-1 centrifuges, configured to produce highly enriched uranium rather than the civilian sort, to produce enough fissile material for a bomb a year.
It has also unveiled a uranium enrichment program that could give it a new means for making fissile material that could go into a nuclear weapon.
Since 1998, his efforts to reconstitute his nuclear program have been focused on acquiring the third and last component, sufficient fissile material to produce a nuclear explosion.
In addition, we will seek to ratify the Comprehensive Test Ban Treaty and negotiate a treaty to end the production of fissile material for use in nuclear weapons.
And we recognize that it is not a problem for governments alone to control this fissile material, it requires good regulations and public-private partnerships to get it right.
"We cannot rule out that Iran has acquired from abroad or will acquire in the future a nuclear weapon or enough fissile material for a weapon, " Blair said.
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Their obsessive compulsion to work fissile material into cruel lethality?
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Crucially, Iraq has lacked fissile material (enriched uranium or plutonium).
It claims to support a treaty to cut off the production of fissile material for bombs, knowing full well that negotiations on that treaty have been stuck for years.
North Korea is now boasting that it has completed experiments to enrich uranium, giving it potentially a second stream of fissile material (it has already tested two plutonium-based bombs).
Current safeguards alone will not be sufficient to guarantee the security of the thousands of warheads and tons of fissile material extracted from dismantled warheads from falling into the wrong hands.
It also expelled the weapons inspectors who were monitoring its plutonium-laden spent fuel rods and a reactor capable of producing more that can be reprocessed into fissile material for nuclear bombs.
In the talks leading up to the July deal, America had encouraged India to cap voluntarily its production of fissile material highly-enriched uranium and plutonium for bombs as the official nuclear five have done.
If the Fluorine gas method is utilized to simplify the Uranium-233 separation and reprocessing then we are right back into the issue of potential for proliferation of fissile material for weapons production.
Another cause might be the growth of Iran's stockpile of LEU to the point where it has enough fissile material to break out of the NPT and test more than one bomb.
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