Tokyo Electric Power Co (TEPCO) workers work on waste water tanks at Japan's Fukushima Daiichi nuclear plant in the town of Okuma, Fukushima prefecture in Japan on June 12, 2013.
Noboru Hashimoto /AFP/Getty Images
Japanese Buddhist monk Tanaka Tokuun, who was evacuated from Fukushima prefecture, looks over an instrument measuring radiation levels at a hotel on March 17.
Buddhika Weerasinghe/Getty Images
The Fukushima Power Plant in Japan had three safety measures in place to make sure the fuel rods inside the nuclear reactor do not overheat. For various reasons attributed to the earthquake that triggered a tsunami, the measures failed.
Screen grabs from Japan's NHK broadcaster shows a Japanese military helicopter dumping water onto reactor Number Three at the stricken Fukushima nuclear power plant on March 17, 2011.
Government officials watch operations at a fuel storage pool inside the Fukushima No.1 plant's third reactor building last August, long before the earthquake that crippled the facility.
Jiji Press/AFP/Getty Images