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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The March 2011 earthquake unleashed a devastating tsunami, and Japan is still coming to terms with its impact - not least the question of restarting its nuclear energy programme after the closure of the crippled Fukushima plant.

BBC: Japan profile

Iran is determined to develop nuclear energy and has a contract with Russia to finish a half-built, German-designed nuclear-power plant in the port of Bushehr on the Persian Gulf.

ECONOMIST: Letters

From 2005 to 2009, it had the highest accident rate of any big Japanese nuclear plant, according to data collected by the Japan Nuclear Energy Safety Organization, a mainly government-funded group.

FORBES: An Immodest Proposal to Spur Nuclear Energy Industry Growth -- and Global Safety