THE firm that ran the Fukushima nuclear plant has apologised for its “cover up” when it delayed disclosure of meltdowns at three reactors. Tokyo Electric Power Company (Tepco) president Naomi Hirose’s apology followed the revelation last week that an investigation had found his predecessor instructed officials during the 2011 disaster to avoid using the word “meltdown”. “I would say it was a cover up,” Hirose told a news conference. “It’s extremely regrettable.” Tepco instead described the reactors’ condition as less serious “core damage” for two months after the earthquake and tsunami on March 11, 2011, wrecked the plant, even though utility officials knew and computer simulations suggested meltdowns had occurred. Tepco finally used “meltdown” in May, 2011, in its public statements after another computer simulation showed fuel in one reactor had almost entirely melted and fallen to the bottom of the primary containment chamber, and that the two other reactor cores had melted significantly. The issue surfaced earlier this year in a separate investigation in which Tepco acknowledged that a company manual had been overlooked during the crisis. The acknowledgement reversed its earlier position that it had no internal criteria to guide how it characterised a meltdown to the public.
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