Nuclear plant operators are battling to prevent meltdowns at three reactors, and Chief Cabinet Secretary Yukio Edano warned Sunday that a hydrogen explosion could occur at Unit 3 of the Fukushima No.1 nuclear power station.

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It is an idea auto companies are looking at closely, but they say the material needs to store 2.5 times to 3.5 times more hydrogen than it does now before it can be seriously considered.

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With the failure of the electrical systems, hydrogen has not been venting, and appears to have resulted in the explosions at 3 buildings.

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