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Satoshi Tsunakawa, president of Toshiba Corp., departs a news conference in Tokyo, Japan, on Tuesday, Feb. 14, 2017. Toshiba's $6.3 billion writedown of its nuclear business on Tuesday prompted the company to say it will stop building new nuclear plants. Photographer: Akio Kon/Bloomberg via Getty Images

Satoshi Tsunakawa, president of Toshiba Corp., departs a news conference in Tokyo, Japan, on Tuesday, Feb. 14, 2017. Toshiba's $6.3 billion writedown of its nuclear business on Tuesday prompted the company to say it will stop building new nuclear plants. Photographer: Akio Kon/Bloomberg via Getty Images