A view of concrete poured into a damaged pit to stop leakage of radioactive contaminated water from the crippled Fukushima Daiichi Nuclear Power Plant No. 2 reactor is seen in Fukushima prefecture, northern Japan April 2, 2011 in this handout from Tokyo Electric Power. Japanese officials grappling on Sunday to end the world's worst nuclear crisis since Chernobyl were focusing on a crack in the concrete pit that was leaking radiation into the ocean from the crippled reactor. Picture taken April 2, 2011.
REUTERS/Tokyo Electric Power (TEPCO)/Handout