Holding "No Nukes" signs, people gathered at Yoyogi Park in Tokyo for a rally Saturday, including Nobel Prize-winning writer Kenzaburo Oe. The protesters then marched peacefully through the streets demanding Japan abandon atomic power.

"I'm worried there could be more nuclear accidents," said Misako Terada, a 54-year-old housewife.

Last year's tsunami in northeastern Japan destroyed backup generators at Fukushima Dai-ichi power plant, causing multiple meltdowns and setting off the world's worst nuclear disaster since Chernobyl. Protesters held a banner that said in Japanese, "Goodbye to nuclear power, call for 10 million people to act."