LONDON (Reuters) – Western powers believe Iran is running short of raw uranium for its nuclear program and are urging producer nations not to sell to Tehran, The Times reported Saturday.

The British newspaper said Britain’s Foreign Office late last year ordered its diplomats in Kazakhstan, Uzbekistan and Brazil — all major uranium producers — to lobby their governments on the issue.

“Countries including Britain, the U.S., France and Germany have started intensive diplomatic efforts to dissuade major uranium producers from selling to Iran,” the newspaper said.

The Western governments accuse Tehran of trying to acquire nuclear weapons under cover of a civilian nuclear energy program. Iran denies the accusation and says it only wants nuclear power in order to generate electricity.

The enriched uranium required for use in nuclear reactors or weapons is produced in centrifuges that spin uranium hexaFLUORIDE gas (UF6) at high speeds. The UF6 is derived in a chemical reaction from “yellow cake,” a concentrate obtained from mined uranium ore.

The vice president of Kazakhstan’s state atomic company told Reuters in an interview in November that the former Soviet republic planned to increase uranium production to nearly 12,000 tonnes this year from around 8,600 tonnes in 2008.

The World Nuclear Association lists the top 10 uranium mining nations in 2007 as Canada, Australia, Kazakhstan, Russia, Niger, Namibia, Uzbekistan, the United States, Ukraine and China. Brazil was 13th.

The Times said the Democratic Republic of Congo, where fighting and smuggling are rife, was another potential source of supply that troubles Western nations and the United Nations nuclear watchdog, the International Atomic Energy Agency.

(Writing by Mark Trevelyan; editing by Michael Roddy)