LAUSANNE, Switzerland: A draft nuclear accord now being negotiated between the United States and Iran would force Iran to cut the amount of hardware it could use to make an atomic bomb by about 40 percent for at least a decade, while offering immediate relief from sanctions that have crippled Iran’s economy, officials told The Associated Press on Thursday.

Officials said the tentative deal imposes new limits on the number of centrifuges Iran can operate to enrich uranium, a process that can lead to nuclear weapons-grade material. The sides are zeroing in on a cap of 6,000 centrifuges, officials said, down from the 6,500 they spoke of in recent weeks.

That’s also less than the 10,000 such machines Tehran now runs, yet substantially more than the 500 to 1,500 that Washington originally wanted as a ceiling.