Opposition in the Kansai region to restarting reactors 3 and 4 at the nuclear plant in Oi, Fukui Prefecture, continued to build Thursday, with Kyoto Gov. Keiji Yamada telling the Nuclear and Industrial Safety Agency that he isn't convinced of their safety.

"I can't concede to their restart at present. Not only are the recently completed stress tests only the first stage, but, for the next stage, we need a statement of guarantee for the comprehensive safety of the reactors," Yamada said.

His remarks came as the central government, through NISA, is attempting to explain safety measures already taken and convince Kyoto and Shiga prefectures, which border Fukui, to agree to the reactors' restart. Political obstacles are mounting in both prefectures.