The utility, known as TEPCO, has reached an out-of-court settlement with the bereaved family of Hisashi Tarukawa, a Fukushima farmer who took his own life days after the Fukushima Daiichi nuclear power plant went into meltdown.
It was the first time the company has accepted in a settlement that the nuclear disaster at its plant was a factor in a suicide, the lawyers said, adding that terms of the settlement package were not being made public.
"I just didn't want TEPCO to keep saying no one was killed because of the nuclear accident," said Kazuya Tarukawa, the dead man's 37-year-old son.
He said he still wanted the company to make an official apology for his father's suicide.
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"Does TEPCO think everything is finished if money is paid?" he said.
"I want them to come to my house under the name of the company and bow to my father's altar. My fight is not over yet."
TEPCO refused to comment on the details of the settlement.
Fukushima was the site of the worst nuclear crisis in a generation. Reactors went into meltdown, spewing radiation over a wide area, after a 9.0-magnitude quake triggered a massive tsunami on March 11, 2011.
Although the natural disaster that spawned the emergency claimed more than 18,000 lives, no one is officially recorded as having died as a direct result of the atomic catastrophe.