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Radioactive water spilled from pools holding spent nuclear fuel rods at the Onagawa power plant in Miyagi Prefecture following the strong earthquake late Thursday, the nuclear safety agency said Friday. At the crisis-hit Fukushima Daiichi nuclear power plant or at another plant in Fukushima Prefecture, meanwhile, no new problems have surfaced since the magnitude 7.1 aftershock of the deadly March 11 quake. While the spent fuel pools at the Onagawa plant and the Higashidori nuclear power station in Aomori Prefecture, both operated by Tohoku Electric Power Co., lost their cooling functions for 20 to 80 minutes after the quake, the temperature hardly rose, the Nuclear and Industrial Safety Agency said.

The No. 1 reactor of the Onagawa nuclear power plant in Miyagi Prefecture on April 7 sustained a jolt greater than what it was designed to withstand during a strong aftershock from the powerful March 11 earthquake, according to nuclear safety officials. The finding raises further doubts about the viability of the assumed quake resistance at the Tohoku Electric Power Co. complex, even though it had been shut down safely after the deadly quake last month. The Nuclear and Industrial Safety Agency has instructed the regional utility serving northeastern Japan to analyze the impact of such a jolt on key facilities at the three-reactor plant, the officials said.