TOKYO — Dozens of protesters shouted and danced at the gate of a nuclear power plant as it restarted Sunday, the first to go back online since Japan shut down all of its reactors for safety checks following the Fukushima nuclear disaster.

Ohi nuclear plant's reactor No. 3 returned to operation despite a deep division in public opinion. Last month, Prime Minister Yoshihiko Noda ordered the restarts of reactors No. 3 and nearby No. 4, saying people's living standards can't be maintained without nuclear energy. Many citizens are against a return to nuclear power because of safety fears after the Fukushima accident.

Crowds of tens of thousands of people have gathered on Friday evenings around Noda's official residence, chanting, "Saikado hantai," or "No to nuclear restarts." Protests drawing such numbers are extremely rare in this nation, often known for orderly conformity. A demonstration in Tokyo protesting the restart and demanding Noda resign was planned in a major park Sunday.