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Workers of Dukovany nuclear power plant are pictured during a nuclear accident exercise on March 26, 2013 in Dukovany nuclear power plant, 50km from the city of Brno. MICHAL CIZEK/AFP/Getty Images ( 518471929 )

An employee works in the central control room during a nuclear accident simulation as part of a safety regulations exercise at Nuclear Power Plant Dukovany in Dukovany March 26, 2013. REUTERS/David W Cerny ( CZECHREPUBLIC/ )

A worker wearing a protective suit adjusts his mask during a nuclear accident simulation as part of a safety regulations exercise at Nuclear Power Plant Dukovany in Dukovany March 26, 2013. REUTERS/David W Cerny ( CZECHREPUBLIC/ )

A worker wearing a protective suit and a mask exits a fallout shelter during a nuclear accident simulation as part of a safety regulations exercise at Nuclear Power Plant Dukovany in Dukovany March 26, 2013. REUTERS/David W Cerny ( CZECHREPUBLIC/ )

An employee works during a blackout in the central control room as part of a safety regulations exercise at Nuclear Power Plant Dukovany in Dukovany March 26, 2013. REUTERS/David W Cerny ( CZECHREPUBLIC/ )

Workers wearing protective suits and masks exit a fallout shelter during a nuclear accident simulation as part of a safety regulations exercise at Nuclear Power Plant Dukovany in Dukovany March 26, 2013. REUTERS/David W Cerny ( CZECHREPUBLIC/ )

Workers of Dukovany nuclear power plant dressed in radiation protection suits are pictured in front of the Dukovany nuclear power plant, 50km from the city of Brno during a nuclear accident exercise on March 26, 2013. MICHAL CIZEK/AFP/Getty Images ( 518471988 )

A worker wearing a protective suit adjusts his mask as he drives a bus during a nuclear accident simulation as part of a safety regulations exercise at Nuclear Power Plant Dukovany in Dukovany March 26, 2013. REUTERS/David W Cerny ( CZECHREPUBLIC/ )

Workers of Dukovany nuclear power plant dressed in radiation protection suits sit in the bus during a nuclear accident exercise on March 26, 2013 in Dukovany nuclear power plant, 50km from the city of Brno. MICHAL CIZEK/AFP/Getty Images ( 518471476 )