Iranian state TV is quoting the Islamic Republic's nuclear chief as saying the country has not put into operation a new generation of centrifuges for enriching uranium.

The Sunday report quoted Ali Akbar Salehi as saying that Iran decided because of a November deal with world powers to not put online 1,000 new devices installed months ago. "Iran will not install more centrifuges," he said.

However Salehi reiterated statements made earlier this week that his engineers are building and testing even newer generations of centrifuges. That claim appeared partly aimed at countering criticism from hard-liners.

Under the deal Iran agreed to cap its nuclear activities in return for an easing of sanctions. Talks on details will resume on Monday.

The West suspects Iran is developing weapon, a charge Tehran denies.