Iran cannot replace and continue to operate the TRR at its current pace.

WHITEHOUSE: Press Briefing

It could also be possible to provide similarly enriched fuel, perhaps from France, for the Tehran Research Reactor (TRR) and LEU targets for producing medical isotopes in the reactor.

ECONOMIST: Iran and nuclear weapons

In 2009 Mr Obama offered to provide Iran with tested and certified fuel for the TRR if Iran would send to a third country (probably Turkey) 75% of the LEU it had processed to date, to be converted to nuclear fuel.

ECONOMIST: Iran and nuclear weapons

Iran has made much in the past of this civil use for its 19.75% LEU, arguing that it is running out of its original imported stock from Argentina (it now has enough to fuel the TRR for over eight years) which it needs for the treatment of cancer patients.

ECONOMIST: Iran and nuclear weapons