Following the devastating 9.0 Tohoku earthquake and tsunami, power outages caused the reactor coolant pumps to stop—a crippling problem considering the backup diesel generators were destroyed in the tsunami. Reactor One overheated, causing a hydrogen explosion and the roof to blow off. Reactors two and three experienced full meltdown as well. Luckily reactors four, five, and six were all off. Because it is the most recent accident, the IAEA Fukushima page continues to provide constant updates.
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