Chanting “Sayonara nuclear power” and waving banners, tens of thousands of people marched in central Tokyo on Monday to call on Japan's government to abandon atomic energy in the wake of the Fukushima nuclear accident.

The demonstration underscores how deeply a Japanese public long accustomed to nuclear power has been affected by the March 11 crisis, when a tsunami caused core meltdowns at three reactors at the Fukushima Dai-ichi complex.

The disaster the worst nuclear accident since Chernobyl saw radiation spewed across a wide part of northeastern Japan, forcing the evacuation of some 100,000 people who lived near the plant and raising fears of contamination in everything from fruit and vegetables to fish and water.

Police estimated the crowd at 20,000 people, while organisers said there were three times that many people.

In addition to fears of radiation, the Japanese public and corporate world have had to put up with electricity shortages amid the sweltering summer heat after more than 30 of Japan's 54 nuclear reactors were idled over the summer to undergo inspections.

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