By MARI YAMAGUCHI (Associated Press) OKUMA, Japan (AP) — The tsunami-wrecked Fukushima Daiichi nuclear power plant ‘s operator says it began releasing its first batch of treated radioactive water into the Pacific Ocean on Thursday — a controversial step that prompted China to ban seafood from Japan. In a live video from a control room at the plant, Tokyo Electric Power Company Holdings showed a staff member turn on a seawater pump with a click of a mouse, marking the beginning of the controversial project that is expected to last for decades. “Seawater Pump A activated,” the main operator said, confirming the release was underway.