It is the AP 1000 reactor, a pressurized water reactor, sold by Westinghouse Electric Co.
Iran is also building a heavy-water reactor that could produce plutonium, another bomb ingredient.
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Iran, by comparison, is producing near-weapons-grade uranium, but it also has a heavy-water reactor being developed that could produce weapons-usable plutonium.
However, it does continue to pursue uranium enrichment and the construction of a heavy water reactor, both of which have military potential.
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.
Iran also began building an actual weapons reactor, a 40 MW heavy water reactor at Arak, that would take natural uranium, and produce plutonium.
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North Korea insists it has built the bomb already, but now wants America to provide it with a modern light-water reactor as the price for disarming.
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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The light-water reactor, which is not capable of producing weapons-grade plutonium, was promised to North Korea in the early 1990s for the North giving up its nuclear weapons.
Moreover, between the Russian-built, soon-to-be-opened nuclear reactor in Bushehr and the illicit heavy water reactor in Arak, Iran will have the capacity to build plutonium-based bombs within two years.
The prototype light-water reactor that North Korea is constructing at Yongbyon, and which requires enriched-uranium fuel, could add to the fissile material stockpile when it is completed, possibly by the end of the year.
At Commons question time on 31 January 2011, Dr Fox said Tehran was continuing to pursue uranium enrichment as well as the construction of a heavy water reactor, both of which had "military potential".
The pressurized water reactor plant is currently supplying 60 megawatts to the Iranian power grid, but will produce a whopping 1, 000 megawatts when operating at full capacity, according to the International Atomic Energy Agency (IAEA).
The enrichment plants at Natanz, Qom and perhaps elsewhere give Iran an early route to HEU. A planned heavy-water reactor at Arak will produce large quantities of plutonium as a by-product, but will not be completed for some years.
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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For example, the Westinghouse AP 1000 reactor places cooling water at a level above the reactor unlike the Fukushima design so that it would naturally flow down.
The water in the reactor is susceptible to damage from radiation, causing it to split into its components, hydrogen and oxygen.
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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.
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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.
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And ue to high radiation levels at the reactor, workers have been unable to pour water into the troubled pool to cool the reactor, avoding meltdown.
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.
There was a moment when there existed the danger of a nuclear explosion, and they had to get the water out from under the reactor, so that a mixture of uranium and graphite wouldn't get into it with the water they would have formed a critical mass.
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