Updating disaster map
The Fukushima Daiichi Nuclear Power Plant comprised six separate boiling water reactors originally designed by General Electric (GE) and maintained by the Tokyo Electric Power Company (TEPCO).
At the time of the Tōhoku earthquake on 11 March 2011, Reactors 4, 5, and 6 were shut down in preparation for re-fueling.
Though there have been no fatalities linked to radiation due to the accident, the eventual number of cancer deaths, according to the linear no-threshold theory of radiation safety, that will be caused by the accident is expected to be around 130–640 people in the years and decades ahead.
Controversially however, an estimated 1,600 deaths are believed to have occurred, primarily in the elderly, who had earlier lived in nursing homes, due to the resultant poor ad-hoc evacuation conditions.
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Immediately after the earthquake, the active reactors automatically shut down their sustained fission reactions.
The full extent of the movement of the resulting corium is unknown but it is now considered to be at least through the bottom of each reactor pressure vessel(RPV), residing somewhere between there and the water-table below each reactor.
In a similar manner to what was observed at reactor 4 in Chernobyl.
Image on 16 March 2011 of the four damaged reactor buildings. Hydrogen-air explosions occurred in Unit 1, 3, and 4, causing structural damage.
A vent in Unit 2's wall, with water vapor/"steam" clearly visible, prevented a similar large explosion.
These operated nominally until the tsunami destroyed the generators for Reactors 1–5.