UN atomic watchdog says tritium concentration of discharged Fukushima water 'far below' operational limit.

"IAEA (International Atomic Energy Agency) experts this week took samples from the first batch of diluted water prepared for discharge," the atomic watchdog, which oversees the process, said in a statement.

The limit is 40 times lower than the Japanese national safety standard for tritium levels in the water, which is in line with the international standard of 60,000 becquerels per litre (Bq/L).