When the accident at Fukushima happened, the temperatures in the reactor vessels increased and the pressures went up. In order to deal with this, steam was released from the pressure vessels. Water boiling in the reactors exposed the fuel rods, and since the zircaloy cladding of the rods reacts with steam, producing hydrogen, this reaction is the most likely source. This situation is, of course, a meltdown.
The problem with the hydrogen, of course, was that it collected in the reactor buildings, mixed with the atmosphere, and exploded.
Fukushima
There are two Fukushima nuclear power plants, both of which are in the Fukushima district on the east coast. Fukushima Daiichi, where the meltdowns happened, is at a town called Okuma. Fukushima Daini, is at a town called Naraha.
There are two Fukushima power plants. Both are in the prefecture of Fukushima, Japan. The plant you have in mind is probably the Fukushima Daiichi Nuclear Power Plant, which experienced a series of meltdowns after an earthquake and tsunami of March 11, 2011. The other is the Fukushima Daini Nuclear Power Plant.
Naoshi Fukushima died in 2003.
Naoshi Fukushima was born in 1925.
Glen Fukushima was born in 1949.
Masami Fukushima was born in 1929.
Masami Fukushima died in 1976.
Tadashi Fukushima was born in 1964.
Yutaka Fukushima was born in 1958.
Fukushima Incident happened in 1882.
Fukushima Masanori died in 1624.