American nuclear worker Carl Pillitteri relives the earthquake and tsunami that precipitated the meltdown at the Fukushima Daiichi nuclear power plant, where he was on site to see the destruction.

The BBC's Roland Buerk is one of the few foreign journalists who has been allowed inside the Fukushima nuclear power station that melted down after the earthquake in Japan last year. He describes the atmosphere, and the steps for the future.

France claims it has designed the world's safest nuclear reactors, but last year's nuclear disaster in Fukushima, Japan, dealt export hopes a blow.