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.

ECONOMIST: The time-bombs of Tomsk

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

FORBES: A Year After Fukushima Meltdown, Is Nuke Power Any Safer?

It says wave energy in the Western Isles has the potential to generate as much power as dozens of nuclear power stations.

BBC: Could big waves be big news for the Western Isles?

Japan Nuclear Fuel's Mr. Fukushi stressed that the United Nations' nuclear watchdog, the International Atomic Energy Agency, will closely monitor Rokkasho's operation to guard against potential diversion of the weapons-usable plutonium.

WSJ: U.S. Opposes Japan's Nuclear Plan

U.S. and European officials said a test for any potential new negotiations will be Iran's treatment of inspectors from the United Nations nuclear watchdog, the International Atomic Energy Agency, who will visit Tehran next week.

WSJ: West Considers Iran's Offer to Talk