Fukushima Dai-Ichi nuclear power plant

Noraha Mayor Yukiei Matsumoto, rear left, plants a tree with children of Naraha residents during an event in Naraha, Fukushima, northern Japan, on Saturday. Koji Sasahara/AP hide caption

An anti-nuclear protester rests in front of bomb-shaped balloon during a rally against Japanese nuclear plants in Tokyo, back in September. Shizuo Kambayashi/AP hide caption

Members of a local government council check an outlet of a so-called groundwater bypass system as they inspect the crippled Fukushima Dai-ichi Nuclear Power Station earlier this week. Kyodo/Landov hide caption

Workers remove nuclear fuel rods from a pool at the Unit 4 reactor of the Fukushima Daii-chi nuclear power plant on Monday. Handout/TEPCO hide caption

This photo taken Aug. 6 shows local government officials and nuclear experts at Fukushima after contaminated water was discovered. AFP/Getty Images hide caption

As they inspected an underground storage pool near the crippled Fukushima Daiichi nuclear power plant earlier this month, Tokyo Electric Power Co. President Naomi Hirose (4th from left) and other officials wore protective suits and masks. Radioactive water stored in some of the pits has leaked. Tokyo Electric Power Co./Reuters /Landov hide caption

Care managers tend elderly people in March 2012 in Minamisoma, Japan. The home's residents were evacuated eight days after the Fukushima Dai-ichi nuclear power station was crippled by the March 11, 2011 tsunami. Koji Sasahara/AP hide caption

Smoke rises from Unit No. 3 of the stricken Fukushima Dai-ichi nuclear plant after the March 11, 2011 earthquake and tsunami. Anonymous/AP hide caption

This photo, taken by a remote-controlled endoscope and released by Tokyo Electric Power Co., shows structures assumed to be small size piping or cable conduit inside the beaker-shaped containment vessel of No. 2 reactor at the damaged Fukushima Dai-ichi nuclear power plant. Tepco/AP hide caption

Workers in protective suits and masks wait to enter the emergency operation center at the crippled Fukushima Dai-ichi nuclear power station on Nov. 12, 2011. David Guttenfelder/AFP/Getty Images hide caption

This file handout picture shows workers spraying water to cool down the spent nuclear fuel in the fourth reactor building at TEPCO's Fukushima Daiichi nuclear power plant. TEPCO/via AFP/Getty Images hide caption

This handout picture, taken by Tokyo Electric Power Co (TEPCO) shows radioactive water on the floor inside the building of a water treatment facility at TEPCO's Fukushima Daiichi nuclear plant. TEPCO/AFP/Getty Images hide caption

Japan's Parliamentary Secretary for the Cabinet Office Yasuhiro Sonoda drinks a glass of decontaminated water taken from puddles inside the buildings housing reactors 5 and 6 at the Fukushima No. 1 plant.

The tsunami flows over sea walls towards TEPCO's Fukushima Daiichi nuclear power plant on March 11, 2011. This photo was taken by Tokyo Electric Power Company. TEPCO/AFP/Getty Images hide caption