Fukushima Daiichi Nuclear Power Station took a direct hit from an enormous tsunami about 50 minutes after the earthquake happened. Pumps
and other outdoor equipment installed on the seaside for releasing heat from the reactor to the sea were damaged, and almost the entire site on
which the reactors were built was flooded as a result of the tsunami. Also, water flooded into the turbine building and other structures and
power-supply facilities became unusable. As a result, various key safety functions, such as the injection of coolant into reactors and the ability to
monitor status, were lost. Furthermore, a variety of damage was inflicted, such as the spread of debris by the tsunami that prevented people from
moving around the site.