• Iran’s nukesIran Says 60 Percent Enrichment “Under Way” at Natanz Site

    Iranian officials say the country has begun enriching uranium up to 60 percent purity, higher than it has ever done before, despite ongoing talks between Tehran and world powers to revive the 2015 nuclear deal. Under the 2015 nuclear deal, Iran had committed to keep enrichment to 3.67 percent. Recently it has been enriching up to 20 percent, saying the deal was no longer enforceable. Enriching uranium to 60 percent would be the highest level achieved by Iran’s nuclear program, it is still short of the 90 percent purity needed for military use.

  • Nuclear storageStrengthening Nuclear Storage Research

    Today, nuclear power utilities store over 80,000 metric tons of spent nuclear fuel across the nation. Since the fuel will remain in dry storage longer than was expected, scientists are working to better understand exactly how the fuel behaves under extended storage conditions, how the canisters age, and the forces the two would undergo when shipped and stored for long periods.

  • Iran’s nukesNatanz Attack Sets Back Iran’s Nuclear Operations

    The Israeli Sunday sabotage operation against Iran’s nuclear facility at Natanz destroyed a well-protected electrical substation housed 40 to 50 meters underground.Iranian officials said that thedestruction of the power supply led to the damage or destruction of “thousands of centrifuges” by causing them to slow down too rapidly.

  • Iran’s nukesSabotage May Weaken Tehran’s Position in Indirect Talks with U.S.

    By Michael Lipin, Payam Yazdian, Katherine Ahn, Linda Gradstein

    With the U.S. and Iran planning their second round of indirect nuclear talks in Vienna this week, some analysts say Sunday’s sabotage of Iran’s Natanz nuclear site has weakened the Iranian position, while others contend it all depends on Iran’s response.

  • Iran’s nukesThe Natanz Blackout: Can the Iran Deal Talks Still Succeed?

    By Ray Takeyh

    Washington and Tehran seem determined to revive the deal that freezes Iran’s nuclear program, despite domestic criticism on both sides and the apparent sabotage of an Iranian facility.

  • Iran’s nukesIran Blames Israel for Suspected Sabotage at Nuclear Facility, Vows Revenge

    Iran has vowed to take “revenge” for an alleged act of sabotage at its main Natanz nuclear site that it blames on its archenemy Israel, an incident that could overshadow diplomatic efforts to revive the 2015 nuclear deal abandoned by former U.S. President Donald Trump.

  • Nuclear detectionWorking Toward a More Secure World

    By Leda Zimmerman

    Neutron resonance transmission analysis (NRTA), which is used for identifying specific kinds of special nuclear materials. Elements come in different forms, or isotopes, and one way to differentiate among isotopes is to bombard them with neutrons. A reliable method for pinning down the nature of nuclear materials is crucial in nuclear security, where verification of weapons treaties may depend on establishing if a warhead slated for elimination is real or fake. The same kind of technology is useful for determining the enrichment status of nuclear fuel, or for revealing the presence of concealed radioactive material.

  • Iran’s nukesIran Begins Uranium Enrichment with More Advanced Centrifuges

    Iran has begun enriching uranium at its underground Natanz plant using a cascade of advanced centrifuges, the latest breach of a 2015 nuclear deal with world powers. The use of the advanced centrifuges is the latest violation of the nuclear accord, which only allows slower first-generation IR-1 centrifuges for enrichment.

  • AIExplainable AI: A Must for Nuclear Nonproliferation, National Security

    As it is with raw human intelligence, so it is with artificial intelligence (AI). We may not know exactly what’s going on inside that elaborate black box built by humans, but its decisions can be so accurate that it earns our trust, if not our comprehension. But the need for understanding escalates when the stakes are higher. For national security concerns, it’s not good enough to know that a system works; scientists demand to know how and why. That’s the foundation for a field of study known as “explainable AI.”

  • Iran’s nukesIran Confirms End to Snap Inspections as U.S. Seeks to “Lengthen, Strengthen” Nuclear Deal

    Iranian state television has confirmed that the country has ended its implementation of the Additional Protocol, which allows for so-called snap inspections of nuclear-related sites, signaling the further disintegration of atomic safeguards in place since a 2015 nuclear deal with world powers.

  • Iran’s nukesIAEA Chief: Iran to Give “Less Access” to UN Nuclear Inspectors

    The head of the UN’s nuclear watchdog agency said after talks in Iran on February 21 over Tehran’s threat to curb international inspections that the two sides reached an agreement but that Iran will suspend a key document on cooperation and offer “less access” to inspectors.

  • Iran’s nukesU.S. Says It's Ready to Meet, but Iran Says Sanctions Should Be Dropped First

    Iran says it will “immediately reverse” its actions that contradict a 2015 nuclear agreement once U.S. sanctions are lifted after Washington said it was ready to revive the deal that former U.S. President Donald Trump abandoned in 2018 before reimposing the crippling penalties on Tehran.

  • Iran’s nukesIran Increasing Enrichment Capacity at Underground Natanz Facility

    According to a confidential report by the International Atomic Energy Agency (IAEA), Iran has begun enriching uranium with a second cascade of IR-2 centrifuges. The 2015 nuclear deal, known as the Joint Comprehensive Plan of Action, or JCPOA, permits Iran to enrich uranium with first-generation IR-1 centrifuges. However, last December Iran told the IAEA that it had begun enriching uranium with the more efficient IR-2 centrifuges and that it would install three more IR-2 cascades.

  • Iran’s nukesIran Enriched “17 Kilograms” of 20 Percent Enriched Uranium, Exceeding Nuclear Pact’s Limits

    Iran says it has produced 17 kilograms of 20 percent-enriched uranium within a month, as Iranian officials continue to dismiss international calls for Tehran to return to full compliance with the 2015 nuclear agreement. About 250 kilograms of 20 percent-enriched uranium are needed to convert it into 15-25 kilograms of the 90 percent-enriched needed for a Hiroshima-size nuclear weapon.

  • Open SkiesRussia to Exit Open Skies Treaty after U.S. Pullout

    Russia says it is beginning the procedure to withdraw from the international Open Skies Treaty after the United States last year left the accord, which allows unarmed aerial surveillance flights over dozens of participating states. The United States formally withdrew on November 22 from the arms-control and verification agreement.