The result, it claims, will be reactor fuel for electricity.
In addition, they say, Iran has no need to make reactor fuel of its own.
Iran has been caught lying about its nuclear program too often to believe that all it wants is reactor fuel.
If the water had actually boiled, the reactor fuel could have been seriously damaged.
The long term plan is currently to place the used civilian reactor fuel in a deep store.
Uranium 235 - the stuff used as reactor fuel - has a half life of 700 million years.
"No one has produced weapons from reactor fuel," he said.
The uranium will be diluted to make commercial reactor fuel.
Previous transfers have involved fresh reactor fuel, which is easier to handle.
Starts up new plant to process uranium for reactor fuel.