Iran’s Centrifuges: The Long Road Towards a Nuclear Bomb

This photo released on Nov. 5, 2019, by the Atomic Energy Organization of Iran shows centrifuge machines in the Natanz uranium enrichment facility in central Iran. (Atomic Energy Organization of Iran via AP, File)
This photo released on Nov. 5, 2019, by the Atomic Energy Organization of Iran shows centrifuge machines in the Natanz uranium enrichment facility in central Iran. (Atomic Energy Organization of Iran via AP, File)
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Iran’s Centrifuges: The Long Road Towards a Nuclear Bomb

This photo released on Nov. 5, 2019, by the Atomic Energy Organization of Iran shows centrifuge machines in the Natanz uranium enrichment facility in central Iran. (Atomic Energy Organization of Iran via AP, File)
This photo released on Nov. 5, 2019, by the Atomic Energy Organization of Iran shows centrifuge machines in the Natanz uranium enrichment facility in central Iran. (Atomic Energy Organization of Iran via AP, File)

The UN nuclear agency has confirmed that Iran plans to install around 6,000 new centrifuges to enrich uranium, according to a report seen by AFP on Friday.

“Iran informed the Agency that it intended to feed” around 6,000 centrifuges at its sites in Fordo and Natanz to enrich uranium to up to five percent, higher than the 3.67 percent limit Tehran had agreed to in 2015.

The Iranian decision came in response to a resolution adopted on November 21 by the UN nuclear watchdog that censures Tehran for what the agency called lack of cooperation.

On Thursday, Iran had threatened to end its ban on acquiring nuclear weapons if Western sanctions are reimposed.

The country’s foreign minister, Abbas Araghchi, said in an interview that the nuclear debate inside Iran is likely to shift towards the possession of its own weapons if the west goes ahead with a threat to reimpose all UN sanctions,

What are centrifuges?

They are precise devices with cylinders that rotate much faster than the speed of sound, to collect enriched uranium atoms.

To explain how centrifugation works, rotating cylinders are much like medical laboratory equipment used to test blood.

The high rotation speeds exert a rotational force that separates the various components of blood as a function of their density and quantity in the sample.

In the case of uranium, the centrifuge operates using the familiar principle of centrifugal force. This force separates two gases of unequal masses in a spinning cylinder or tube. The heavier uranium-238 isotope collects at the outer edges of the cylinder while the lighter uranium-235 collects near the axis of rotation at the center.

Around 20 kg of uranium enriched to a 90% purity level would be needed for a single nuclear weapon. It would take about 1,500 SWU to produce a weapon-equivalent of 90 percent-enriched uranium from this enriched uranium.

At Fordo, Iran is currently using the two only operating cascades of IR-6 centrifuges there to enrich to 60% from 20%.

There are 1,044 centrifuges active at the Fordo uranium enrichment plant, Iran's President Masoud Pezeshkian said.

He had earlier asked the Iran Atomic Energy Agency to begin inserting uranium gas into newly activated advanced centrifuges.

Early this month, a spokesperson for the US State Department said Iran's expansion of uranium enrichment activities in defiance of key nuclear commitments is "a big step in the wrong direction”.

His statement came after Tehran announced it would start injecting uranium gas into centrifuges at Fordo.

Dispute

The Nuclear Non-Proliferation Treaty, signed in 2015 between Tehran and Western countries, says advanced centrifuges for uranium enrichment could operate until January 2027.

The difference between the first generation of centrifuges (IR-1) and the other generations is speed. The latest generation, IR-6, could enrich uranium up to 10 times faster than the first-generation IR-1, according to Iranian officials.

During the heyday of its nuclear program, Iran operated a total of 10,204 first-generation IR-1 centrifuges at the Natanz and Fordo facilities. But under the deal, Iran's commitments included operating no more than 5,060 IR-1 centrifuges for a period of 10 years.

Although the centrifuges that Iran installed before the 2015 nuclear deal were of the first generation, Tehran’s recent uranium enrichment activity at nuclear sites has reached disturbingly advanced levels, potentially increasing the nuclear proliferation risk.

Major centrifuge activities in Iran

May 2008: Iran installed several centrifuges including more modern models.

March 2012: Iranian media announced 3,000 centrifuges at Natanz.

August 2012: The International Atomic Energy Agency announced that Iran had installed large parts of the centrifuges at Fordo.

November 2012: An IAEA report confirmed that all advanced centrifuges had been installed at Fordo, although there were only four working centrifuges, and another four fully equipped, vacuum tested, and ready to go.

February 2013: IAEA says Iran has operated 12,699 IR-1 centrifuges at the Natanz site.

June 2018: Iran’s supreme leader revealed Tuesday that it ultimately wants 190,000 nuclear centrifuges — a figure 30 times higher than world powers allowed under the 2015 deal.

September 2019: Iran mounted 22 IR-4, one IR-5, 30 IR-6, and three IR-6 for testing, outside the treaty boundaries.

September 2019: Iran announced it started operating advanced and fast centrifuges to enrich uranium.

November 2024: Iranian Foreign Minister Abbas Araghchi announces that his country will operate several thousand advanced centrifuges.

November 2024: Iranian state television broadcasts AEOI Chief Mohammad Eslami announcing that “gasification of a few thousands of new generation centrifuges has been started.”



Iran-Israel War: A Lifeline for Netanyahu?

FILE - Israeli Prime Minister Benjamin Netanyahu attends a ceremony on the eve of Israel's Remembrance Day for fallen soldiers at the Yad LaBanim Memorial in Jerusalem, on April 29, 2025. (Abir Sultan/Pool Photo via AP, File)
FILE - Israeli Prime Minister Benjamin Netanyahu attends a ceremony on the eve of Israel's Remembrance Day for fallen soldiers at the Yad LaBanim Memorial in Jerusalem, on April 29, 2025. (Abir Sultan/Pool Photo via AP, File)
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Iran-Israel War: A Lifeline for Netanyahu?

FILE - Israeli Prime Minister Benjamin Netanyahu attends a ceremony on the eve of Israel's Remembrance Day for fallen soldiers at the Yad LaBanim Memorial in Jerusalem, on April 29, 2025. (Abir Sultan/Pool Photo via AP, File)
FILE - Israeli Prime Minister Benjamin Netanyahu attends a ceremony on the eve of Israel's Remembrance Day for fallen soldiers at the Yad LaBanim Memorial in Jerusalem, on April 29, 2025. (Abir Sultan/Pool Photo via AP, File)

The Iran-Israel war has helped strengthen Israeli Prime Minister Benjamin Netanyahu domestically and overseas, just as his grip on power looked vulnerable.

On the eve of launching strikes on Iran, his government looked to be on the verge of collapse, with a drive to conscript ultra-Orthodox Jews threatening to scupper his fragile coalition.

Nearly two years on from Hamas's unprecedented attack in 2023, Netanyahu was under growing domestic criticism for his handling of the war in Gaza, where dozens of hostages remain unaccounted for, said AFP.

Internationally too, he was coming under pressure including from longstanding allies, who since the war with Iran began have gone back to expressing support.

Just days ago, polls were predicting Netanyahu would lose his majority if new elections were held, but now, his fortunes appear to have reversed, and Israelis are seeing in "Bibi" the man of the moment.

– 'Reshape the Middle East' –

For decades, Netanyahu has warned of the risk of a nuclear attack on Israel by Iran -- a fear shared by most Israelis.

Yonatan Freeman, a geopolitics expert at the Hebrew University of Jerusalem, said Netanyahu's argument that the pre-emptive strike on Iran was necessary draws "a lot of public support" and that the prime minister has been "greatly strengthened".

Even the opposition has rallied behind him.

"Prime Minister Benjamin Netanyahu is my political rival, but his decision to strike Iran at this moment in time is the right one," opposition leader Yair Lapid wrote in a Jerusalem Post op-ed.

A poll published Saturday by a conservative Israeli channel showed that 54 percent of respondents expressed confidence in the prime minister.

The public had had time to prepare for the possibility of an offensive against Iran, with Netanyahu repeatedly warning that Israel was fighting for its survival and had an opportunity to "reshape the Middle East."

During tit-for-tat military exchanges last year, Israel launched air raids on targets in Iran in October that are thought to have severely damaged Iranian air defenses.

Israel's then-defense minister Yoav Gallant said the strikes had shifted "the balance of power" and had "weakened" Iran.

"In fact, for the past 20 months, Israelis have been thinking about this (a war with Iran)," said Denis Charbit, a political scientist at Israel's Open University.

Since Hamas's October 7, 2023 attack on Israel, Netanyahu has ordered military action in Gaza, against the Iran-backed Hezbollah group in Lebanon and the Houthis in Yemen, as well as targets in Syria where long-time leader Bashar al-Assad fell in December last year.

"Netanyahu always wants to dominate the agenda, to be the one who reshuffles the deck himself -- not the one who reacts -- and here he is clearly asserting his Churchillian side, which is, incidentally, his model," Charbit said.

"But depending on the outcome and the duration (of the war), everything could change, and Israelis might turn against Bibi and demand answers."

– Silencing critics –

For now, however, people in Israel see the conflict with Iran as a "necessary war," according to Nitzan Perelman, a researcher specialized in Israel at the National Center for Scientific Research (CNRS) in France.

"Public opinion supports this war, just as it has supported previous ones," she added.

"It's very useful for Netanyahu because it silences criticism, both inside the country and abroad."

In the weeks ahead of the Iran strikes, international criticism of Netanyahu and Israel's military had reached unprecedented levels.

After more than 55,000 deaths in Gaza, according to the health ministry in the Hamas-run territory, and a blockade that has produced famine-like conditions there, Israel has faced growing isolation and the risk of sanctions, while Netanyahu himself is the subject of an international arrest warrant for alleged war crimes.

But on Sunday, two days into the war with Iran, the Israeli leader received a phone call from European Commission President Ursula von der Leyen, while Foreign Minister Gideon Saar has held talks with numerous counterparts.

"There's more consensus in Europe in how they see Iran, which is more equal to how Israel sees Iran," explained Freeman from the Hebrew University of Jerusalem.

German Chancellor Friedrich Merz said Tuesday that Israel was doing "the dirty work... for all of us."

The idea that a weakened Iran could lead to regional peace and the emergence of a new Middle East is appealing to the United States and some European countries, according to Freeman.

But for Perelman, "Netanyahu is exploiting the Iranian threat, as he always has."