Japan says the stricken Fukushima nuclear plant will have to be shut down - after sustaining catastrophic damage during the earthquake and tsunami.
Japanese Prime Minister Naoto Kan said the facility at the centre of the worst atomic accident since Chernobyl in 1986 must be decommissioned.
However, there were no plans to widen a 12-mile exclusion zone around the plant - despite the UN atomic watchdog saying radiation in one village 40 kilometres away had reached evacuation levels.
The IAEA's head of nuclear safety and security, Denis Flory, told reporters in Vienna that radiation levels there had exceeded the criteria for triggering evacuations.
French President Nicolas Sarkozy arrived in Tokyo earlier and called on nuclear authorities in the G20 nations to establish an international safety standard.