Iran unveiled a redevelopment of part of its Arak heavy water reactor on Monday - a move that did not breach international restrictions on its nuclear work but showed it is developing the sector in the face of U.S. pressure.
![Iran unveils development at Arak reactor in face of U.S. pressure](https://media.zenfs.com/en-US/reuters.com/76af37cea89b43d64ac81f58b2370c20)
Iranian state media said technicians switched on a secondary circuit at Arak, a plant built to produce the heavy water used as a moderator to slow down reactions in the core of nuclear reactors.
"Today we are ... starting a noteworthy section of the reactor," the head of Iran's atomic agency, Ali Akbar Salehi, said in remarks broadcast live on state TV.