3.2.2 Hydrogen explosions demonstration
The three explosions at Fukushima caused a great deal of damage. The video illustrates how dramatic a hydrogen explosion can be!
In 2011, TEPCO who owned the Daiichi plant would declare that cooling systems for reactors 1–4 were beyond repair and would have to be replaced.
The video in the next section shows the damage within the Daiichi plant.
OpenLearn - The science of nuclear energy
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