Japan will consider pouring concrete into its crippled Fukushima atomic plant to reduce radiation and contain the worst nuclear disaster in 25 years.

Chief Cabinet Secretary Yukio Edano yesterday ruled out the possibility that the two undamaged reactors at Tokyo Electric Power Co.'s six-unit Dai-Ichi plant would be salvaged. Units 1 through 4 suffered from explosions, presumed meltdowns and corrosion from seawater sprayed on radioactive fuel rods after a March 11 earthquake and tsunami cut power to reactor cooling systems.