There are any number of obstacles that could trip up the nuclear negotiations between Iran and the “P5+1”—the U.S., Britain, France, Russia, China and Germany— but the right to “enrich” nuclear fuel should not be one of them. Any close reading of the 1968 “Treaty on the Non-Proliferation of Nuclear Weapons” (NPT) clearly indicates that, even though the word “enrichment” is not used in the text, all signers have the right to the “peaceful applications of nuclear technology.”
Enriched fuel is produced when refined uranium ore—“yellowcake”—is transformed into uranium hexafluoride gas and spun in a centrifuge. The result is fuel that may contain anywhere from 3.5 to 5 percent Uranium 235 to over 90 percent U-235. The former is used in power plants, the latter in nuclear weapons. Some medical procedures require fuel enriched to 20 percent.
Iran currently has some 15,700 pounds of 3.5 to 5 percent nuclear fuel, and 432 pounds of 20 percent enriched fuel. International Atomic Energy Agency investigators have never turned up any weapons grade fuel in Iran and have certified that Teheran is not diverting fuel to build nuclear weapons. Intelligence agencies, including Israel’s, are in general agreement that Teheran has not enriched above 20 percent. A nuclear weapon requires about 110 pounds of uranium fuel enriched to between 90 and 95 percent.
Iran insists it is not building a weapon, and its Supreme Leader, Ayatollah Ali Khamenei, issued a fatwa, or religious ruling, against the production of nuclear weapons as being contrary to Islamic beliefs.