A team of nuclear experts from the International Atomic Energy Agency urged Japan this week to reach a decision quickly on what to do with treated water that contains low toxicity radioactive tritium, which is accumulating at the crippled Fukushima No. 1 nuclear plant.

"We advised the Japanese government that ... (a) decision should be taken very rapidly for the disposition path for water which is stored in these tanks," said Christophe Xerri, leader of the 13-member team, on Tuesday following a nine-day review of progress on scrapping the Fukushima No. 1 plant.

The facility was damaged in the March 2011 earthquake and tsunami.