Tepco has been walking a tightrope at the Fukushima No. 1 nuclear plant for the last three years, and many of its missteps have been glaring.

Having to clean up the worst nuclear disaster since Chernobyl was never going to be simple or easy, but senior officials of Tokyo Electric Power Co. have been forced time and again to apologize for serious problems.

Most recently, just weeks before the three-year anniversary of the start of the catastrophe, they had to admit that 100 tons of highly toxic water had leaked from one of the huge tanks set up at the site.