While it's almost impossible to determine exactly where the next reactor will crop up, we've developed our own handicapping system to boil down the choices somewhat.
In 2003, cowed by the might deployed in removing Saddam Hussein, it opened up Natanz, and a nuclear reactor site at Arak that had also previously been secret, to IAEA inspection.
Some of the shortfall will come from the new Watts Bar nuclear reactor, set to start up next year.
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Providing them for each small reactor is bound to push up costs.
In exchange, the EU diplomats publicly assured the Iranians that, their countries would reward improved behavior (such as Tehran's agreement not to reprocess nuclear reactor fuel and its signing up to - and implementing - a new, more intrusive inspection accord with the IAEA) with still more Western nuclear technology.
Tepco says it will come up with a new plan to stabilise the reactor by Tuesday.
The piston then moves back up to sustain the reaction in the upper reactor, and so on.
The reactor also lacks a back-up mechanism to stop it overheating and exploding should the helium coolant escape.
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That's a lot of risk capital for any venture-backed start-up, especially considering that not one new commercial nuclear reactor design has been approved and built in the United States for 30 years.
Last summer, an NRC task force reviewed the Fukushima accident and came up with a dozen recommendations to reduce U.S. reactor vulnerability.
From the beginning the challenge was coming up with an inexpensive catalyst that could be reused in the reactor, driving the cost of the process below the market price of gas.
Lightbridge Corporation, a pioneering nuclear-energy start-up company based in McLean, VA, is developing the Radkowsky Thorium Reactor in collaboration with Russian researchers.
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