It is the AP 1000 reactor, a pressurized water reactor, sold by Westinghouse Electric Co.
Finland is using a new breed of pressurized water reactor that is being built by a German-French consortium for around three billion euros.
Which allows them to extract plutonium from the fuel rods used in the light water reactor, the second one that was finished in 1998.
The 825-megawatt pressurized water reactor at Three Mile Island, about 10 miles outside Harrisburg, Pennsylvania, has been in service since 1974 and can power about 800, 000 homes.
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Each of the reactors will be a small, modular, 125MW advanced light water reactor, which at the present time includes a design for the nuclear core and steam generator to be located at the same site, with passive safety designs.
But disputes, like the current argument about whether North Korea gets a light-water reactor as part of a deal for dismantling its weapons program, have happened before, and as of now the six-party negotiations scheduled to resume in November appear to be still on.
The top government spokesman said TEPCO has begun new cooling operations to fill the reactor with sea water and pour in boric acid to prevent an occurrence of criticality, noting it may take several hours to inject water into the reactor.
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Meanwhile, engineers are continuing to pump some 11, 500 tonnes of low-level radioactive seawater into the sea so the more highly contaminated water from reactor No 2 can be stored in waste buildings.
Intensely radioactive water from reactor Unit 2 is filling a nearby tunnel faster than workers can empty it, and radioactive levels of seawater near the plant increased sixfold following an aftershock on Saturday.
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The water in the reactor is susceptible to damage from radiation, causing it to split into its components, hydrogen and oxygen.
FORBES: Explainer: What Caused The Incident At Fukushima-Daiichi
The water leak occurred in thousands of tubes that carry heated water from the reactor core through the plant's steam generators.
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.
The tsunami destroyed the diesel generators that provide power to drive the pumps that circulate the water coolant through the reactor that removes decay heat.
FORBES: Explainer: What Caused The Incident At Fukushima-Daiichi
That thinking changed on March 28, 1979, when a small valve stuck open, cooling water escaped and the reactor core of TMI's Unit 2 began to melt.
Because this was a reactor that operated on water that was already at its boiling point, this also meant that the pressure inside the reactor was rising as well.
FORBES: Explainer: What Caused The Incident At Fukushima-Daiichi
There are a number of different reactors in use, most commonly water-cooled pressurised or boiling water reactors - though other reactor types are kept cool with the help of liquid metal, gas or molten salt.
The operation came a day after workers plugged a highly radioactive water leak from a concrete pit connected to the number two reactor, using sodium silicate - known as ''water glass''.
That came alongside news that the volume of the reactor's cooling water had declined sharply.
The failure of diesel generators, which power water pumps that are critical to reactor cooling systems, was a leading cause of the current crisis.
As of 14:00 local time (05:00 GMT) on Friday, the temperature of water inside the cooling pool at reactor 3 was 15.1C, well below the safety limit of 65C, Tepco said.
The San Onofre nuclear power plant is perched right on the San Diego beach and the reactor is cooled by ocean water.
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Without that water, the fuel rods in the reactor begin to melt.
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Contaminated water is being pumped out of nuclear reactor units 1 and 2, but not yet being pumped out of units 3 and 4.
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In fact, the military is constantly testing green-power projects, such as a contraption that provides power and purifies water, or even a mobile nuclear reactor.
Spain's oldest nuclear power station - the Santa Maria de Garona plant - was shut down on Sunday because the Ebro river water became too hot to cool its reactor.
At Purdue University in Indiana, scientists are working on a reactor-like device that uses water circulated by gravity to keep the core cool.
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Without an active removal of decay heat, the reactor was adding heat to the water faster than it was taking it out, and the temperature was rising.
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.
The water he drank was taken from puddles under two reactor buildings.
Tepco had been pumping water to raise the level in the No. 2 reactor.
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