A worker walks past an animal character bearing a notice saying, "nuclear radiation management area begins", at no.6 reactor building at Tokyo Electric Power Co.'s (TEPCO) Kashiwazaki Kariwa nuclear power plant, which is the world's biggest, in Kashiwazaki, November 12, 2012. Tokyo Electronic Power Co will probably have to delay restarting the world's biggest nuclear plant, which is sitting idle in the wake of the Fukushima disaster 20 months ago, further raising costs as the utility spends more on fossil fuels to generate electricity. Picture taken November 12, 2012. REUTERS/Kim Kyung-Hoon (J

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A worker walks past an animal character bearing a notice saying, "nuclear radiation management area begins", at no.6 reactor building at Tokyo Electric Power Co.'s (TEPCO) Kashiwazaki Kariwa nuclear power plant, which is the world's biggest, in Kashiwazaki, November 12, 2012. Tokyo Electronic Power Co will probably have to delay restarting the world's biggest nuclear plant, which is sitting idle in the wake of the Fukushima disaster 20 months ago, further raising costs as the utility spends more on fossil fuels to generate electricity. Picture taken November 12, 2012. REUTERS/Kim Kyung-Hoon (JAPAN - Tags: ENERGY BUSINESS)