TEPCO, Fukushima plant
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Commercial nuclear reactors all work pretty much the same way. Atoms of a radioactive material split, emitting neutrons. Those bump into other atoms, splitting them and causing them to emit more neutrons, which bump into other atoms, continuing the chain reaction.
The disaster was triggered by one mistake, under the pressure of a deadline, and it unleashed a deadly radiation and chaos. Hisashi's colleague Masato Shinohara and supervisor Yutaka Yokokawa poured 16kg of uranium into a processing tank, far exceeding the safe limit of 2.4kg.