On and RWE - hope to build a new power station, next to the existing reactor building, after 2025.
The main reactor building will not be pulled down until about 2100 when the radioactive levels in the building become safe.
Where most attention has centred on reactors 1, 2 and 3, there is also concern about the spent fuel pond in reactor building 4.
The reactor vessels remained intact as did the reinforced concrete containment buildings, but each reactor building lost its hat due to the hydrogen explosions.
FORBES: Explainer: What Caused The Incident At Fukushima-Daiichi
But Tepco said melting fuel rods had created a hole in the chamber, allowing 3, 000 tonnes of contaminated water to leak into the basement of the reactor building.
Workers at the Fukushima Daiichi plant are attempting to remove highly radioactive water from a reactor building to allow repair work to the cooling systems knocked out on 11 March.
Meanwhile, radiation levels outside the reactor building rose sharply.
According to the government's blueprint for dismantling Fukushima Daiichi, engineers will first have to repair the reactor building leaks, which could take six years, then drain the buildings of radioactive water, which could take an additional two years.
WSJ: Japan to Take 40 Years to Dismantle Fukushima Nuclear Plant
It was only a matter of time before the hydrogen reached a level where it would detonate, and one after another, the first unit, then the third unit, and finally the second unit, suffered hydrogen explosions that blew off the steel panels and left the top of the reactor building exposed.
FORBES: Explainer: What Caused The Incident At Fukushima-Daiichi
Normally, circulation would channel the hydrogen and oxygen to a recombiner where they would be restored back to water, but in the hours after the reactors were shut down, hydrogen was accumulating and separating in the wetwell and reached a point where it was vented into the sparse steel-frame structure at the top of the reactor building.
FORBES: Explainer: What Caused The Incident At Fukushima-Daiichi
Iraq's official nuclear program was dealt a setback in 1981, when a reactor it was building in Osirak was destroyed in a raid by the Israeli air force.
The shield building is intended to protect the reactor from damage and provide a radiation barrier, in the event of an accident.
Professor Egil Lillestol of Bergen University has been pushing thorium for some years now, and thinks that Norway should set the trend in building a prototype accelerator-driven reactor in which a massive particle accelerator converts thorium-232 to uranium-233 by irradiating it with slow (spallation) neutrons generated by the impact of a 1.6 GeV proton beam on a lead target.
The building surrounding the vessel containing the No. 1 reactor exploded on March 12.
FORBES: New Explosion Destroys Second Fukushima Nuclear Reactor Building
They challenged the reactor on several grounds, including the novel design of its shield building.
This time, say reactor vendors and big engineering and construction firms hoping to do the building, things will be different.
The building of the two reactors will be staggered with the first reactor expected to be operational in about eight years' time (2021).
This rectangular secondary containment building is the structure that most people have seen in pictures of the reactor.
FORBES: Explainer: What Caused The Incident At Fukushima-Daiichi
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