RIKUZENTAKATA, Japan (AP) — Highly radioactive water spilled into the ocean from a tsunami-damaged nuclear power plant Saturday as Japan's prime minister surveyed the damage in a town gutted by the wave.The Fukushima Dai-ichi nuclear complex has been spewing radioactivity since March 11, when a magnitude-9.0 earthquake and ensuing wave knocked out power, disabling cooling systems and allowing radiation to seep out of the overheating reactors. Authorities said the leak they identified Saturday could be the source of radioactivity found in coastal waters in recent days.Prime Minister Naoto Kan went to the plant and flew over the tsunami-ravaged coast soon after the wave hit, but Saturday was the first time he set foot in one of the pulverized towns.Dressed in the blue work clothes that have become almost a uniform for officials, Kan stopped in Rikuzentakata, where the town hall is one of the few buildings still standing. All its windows are blown out and a tangle of metal and other debris is piled in front of it.The prime minister bowed his head for a minute of silence in front of the building.