Japan's nuclear agency says the quake that struck northeastern Japan on Thursday, disabled all but one outside power supply line at the Onagawa nuclear power plant in Miyagi Prefecture.
The Nuclear and Industrial Safety Agency says 2 of the 3 power lines became unavailable and the plant is using the only remaining line to cool its nuclear reactors.
It says the cooling systems of 3 spent fuel pools were disabled at one point, but had all been restored.
The agency reports no abnormal radiation readings at the plant.
At the Fukushima Daiichi and Daini nuclear power plants, instrument readings and radiation monitors showed no changes following the quake.
At the Higashidori nuclear power plant in Aomori Prefecture, the quake shut down all outside power lines, prompting the plant to switch on emergency diesel power generators.
The plant had shut down its reactors and was undergoing an inspection at the time of the quake.
No serious effects were reported with the cooling systems of storage pools for spent fuel rods.
A nuclear fuel reprocessing plant in Rokkasho, Aomori Prefecture, also lost all outside power and is operating on emergency diesel generators at the moment.
No irregularities have also been reported at the Tokai Daini nuclear power plant in Ibaraki Prefecture.
All these nuclear power plants had suspended power generating operations at their reactors after the March 11th earthquake and tsunami.
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