In 2003, Iran accepted the so-called "additional protocol" of snap inspections for two years, but parliament never ratified it.
"The government may accept the additional protocol based on its expediency and progress in the nuclear talks, but the Iranian parliament makes the final decision," Behrouz Kamalvandi, the spokesman for the atomic energy agency, was quoted as saying by the official IRNA news service.
He added that countries are not obliged to accept the additional protocol under the Non-Proliferation Treaty.
Iran and world powers, the five permanent members of the UN Security Council plus Germany," plan to hold another round of talks on July 2.
Under an interim deal in November, Iran agreed to freeze or limit various nuclear activities in return for a limited easing of sanctions, an agreement that was intended to buy time for the negotiation of a comprehensive solution to the decade-long impasse.
