to pump out more nuclear materials at a faster rate. as you can imagine that has raised concerns around the world. staosteve centanni for this live. how did the international community become wear of this. >> reporter: diplomats in vienna are telling news organizations that the iranians are moving forward with this plan. teheran sent a letter to the a tony dungy energy agency about its upgrade of equipment at iran's main enrichment facility about 140 miles southeast of teheran. iran has 10,000 centrifuges at that plant. they are an older type that easily breaks down and were believed to be compromised at one point about two years ago by the stux-net computer violence. the new technology developed in iran with the hef pakistan would be able to enrich uranium two to three times faster. it's believed iran plans to install about 3,000 of these newer, faster machines. iran is believed to have enough