Dianne Feinstein, D-California, and Rep. Darrell Issa, R-California, toured the power plant, to question the need for nuclear energy and raise alarms about a potential environmental catastrophe.

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If such a reactor could meet the targets claimed for it by its proponents (a big if, says Harvard's Mr Bunn), it has the potential to be cheaper than existing types of nuclear energy, safe from Chernobyl-style large accidents, and more proliferation-resistant than typical reactors.

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Nuclear power has the potential to be the safest means of producing electrical energy, but to be that, some things need to change.

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