VIENNA (Reuters) - Iran is pressing ahead with the construction of a research reactor that Western experts say could offer it a second way of producing material for a nuclear bomb if it decides to make one, a U.N. report showed on Wednesday.
Iran has transported the reactor vessel to the heavy water plant near the central town of Arak but has not yet installed it, the International Atomic Energy Agency (IAEA) said in a confidential report issued to member states.
Western concerns about Iran are focused largely on uranium enrichment plants at Natanz and Fordow, as such material refined to a high level can provide the fissile core of an atomic bomb.
"Once the reactor operates, it could spawn more than enough weapons-grade plutonium for a bomb per year, should Iran ever decide to do that," said nuclear expert Mark Hibbs of the Carnegie Endowment think-tank.
The Islamic Republic, which denies it has any intention of acquiring nuclear arms, plans to commission the plant in the first quarter of 2014, the IAEA said.
Tehran last year postponed the planned start-up from the third quarter of 2013, a target that Western experts said always had seemed unrealistic.
As reported by Reuters on Tuesday, the IAEA report showed Iran increasing its capacity to refine uranium by installing hundreds more centrifuges at Natanz, underlining Tehran's defiance of Western demands to curb the activity.
But, in a development that could help buy time for diplomacy between Iran and world powers, the report showed limited growth of Iran's most sensitive nuclear stockpile and it remained below an Israeli "red line" for possible action.
Tehran's holding of medium-enriched uranium gas is closely watched as Israel says it must not amass enough for one bomb if further processed and has threatened air strikes if diplomacy and sanctions do not stop Iran's atomic drive.
Critics say Iran is trying to achieve the capability to make atomic arms. Iran denies this, saying it needs nuclear technology for energy generation and medical purposes and that it is Israel's reputed nuclear arsenal that threatens peace in the Middle East.
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