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The Conversation
The Conversation
Anna Erickson, Professor of Nuclear and Radiological Engineering, Georgia Institute of Technology

Why the US bombed a bunch of metal tubes − a nuclear engineer explains the importance of centrifuges to Iranian efforts to build nuclear weapons

An image from Iranian television shows centrifuges lining a hall at Iran's Natanz uranium enrichment facility in 2021. IRIB via APPEAR

When U.S. forces attacked Iran’s nuclear facilities on June 21, 2025, the main target was metal tubes in laboratories deep underground. The tubes are centrifuges that produce highly enriched uranium needed to build nuclear weapons.

Inside of a centrifuge, a rotor spins in the range of 50,000 to 100,000 revolutions per minute, 10 times faster than a Corvette engine’s crankshaft. High speeds are needed to separate lighter uranium-235 from heavier uranium-238 for further collection and processing. Producing this level of force means the rotor itself must be well balanced and strong and rely on high-speed magnetic bearings to reduce friction.

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