Iran and world powers are very likely to have found solution to deal with the remaining 7,537 kg low enriched uranium (LEU) stockpile in Iran, a source told Xinhua on Friday.

With the July 7 deadline approaching, nuclear negotiators are striving to finalize a comprehensive deal in Vienna.

Iran's fissile materials are one of the Western's core concerns over Tehran's nuclear plan, as technically, large enriched uranium stockpile will allow Iran to be able to make a nuclear bomb in a relatively short time.

In the framework deal agreed in Lausanne, Iran will reduce its stockpile of all the LEU to 300 kg of 3.67 percent LEU for 15 years, but the framework failed to specify by which means, Iran would be able to reduce the stockpile.

The source told Xinhua this should not be a problem any more.

According to a recent IAEA report, Iran owns 7,537 kg LEU stockpile in end-June.

Dealing with the nuclear material is considered a sensitive issue, and the Western states had asked Iran to ship its nuclear materials out of the country, but Tehran rejected the proposal.

Iran and the five UN Security Council permanent members plus Germany have been negotiating over the past 16 moths to reach a long-term deal over Tehran's controversial atomic plan.

During the period, Iran would suspend some sensitive nuclear activates, in return, Western nations would partially relief some sanction imposed on Tehran.