The International Atomic Energy Agency is considering the option of a multinational mission to decommission the Fukushima No. 1 plant’s wrecked nuclear reactors, a challenge that will take decades to complete.

“The safe decommissioning (of the reactors) should be undertaken not just by Japan but should draw on the wisdom and the most advanced technologies from around the world,” IAEA Director General Yukiya Amano said in an interview Thursday.

The U.N. nuclear watchdog is planning to send an international team of experts to Japan in April to consult with local authorities about retiring the reactors.