Tokyo Electric Power Company faced pressure on Tuesday from angry shareholders to shut all its reactors.
Tepco said on Sunday the first step would be cooling the reactors and spent fuel to a stable level within three months.
Workers were withdrawn from a building at Japan’s earthquake-wrecked nuclear plant on Sunday after potentially lethal levels of radiation were found.
Japanese authorities evacuated workers on Sunday from a reactor building they were working in after high doses of radiation were detected.
Japan made some progress to avert disaster at a tsunami-damaged power plant, though leaks underlined perils from the worst crisis since Chernobyl.
Japan warned radioactive levels had become "significantly" higher around a nuclear power plant on Tuesday after explosions at two reactors.
Japan scrambled to avert a meltdown at a nuclear plant on Monday after a hydrogen explosion at one reactor and exposure of fuel rods at another.
A hydrogen explosion rocked the earthquake-stricken nuclear plant in Japan where authorities have been working desperately to avert a meltdown.
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/ 22 February 2010
A document claiming Toyota saved $100m by convincing regulators to agree to a cheap fix for acceleration problems has raised pressure on Akio Toyoda.
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/ 8 February 2010
Toyota, which has recalled more than eight million vehicles for problems with unintended acceleration, has decided to recall its new Prius hybrid.