Masao Yoshida (nuclear engineer)
February 17, 1955|
|Died||July 9, 2013
Shinjuku, Tokyo, Japan
Cause of death
Masao Yoshida (吉田 昌郎 Yoshida Masao?, 17 February 1955 – 9 July 2013) was born in Osaka, Japan and was a General Manager in the Nuclear Asset Management Department of the Tokyo Electric Power Co., Inc. (TEPCO), Japan. He was the plant manager during the Fukushima Daiichi nuclear disaster, where he played a critical role by disobeying corporate headquarters orders to stop using seawater to cool the reactors. According to nuclear physicist (and co-founder of String field theory), Dr. Michio Kaku, the decision to use seawater arguably prevented a much greater disaster. The massive influx of seawater is the only thing that stopped the cores from melting[clarification needed], according to Dr. Kaku, who added this was a last-ditch effort. Yoshida managed to gain the trust of Prime Minister Naoto Kan, whom he met the day after the tsunami on a plant tour. They had both attended Tokyo Institute of Technology.
On 12 March 2011, about 28 hours after the tsunami struck, Yoshida and other TEPCO executives had ordered workers to start injecting seawater into Reactor No. 1 to keep the reactor from overheating and going into meltdown. But 21 minutes later, they ordered Yoshida to suspend the operation. Yoshida chose to ignore the order and ordered the plant workers to continue. At 20:05 JST that night, the Japanese government again ordered seawater to be injected into Unit 1.
The week of 7 June 2011, TEPCO gave Yoshida a verbal reprimand for defying the order and not reporting it earlier.
Yoshida was diagnosed with esophageal cancer, which was determined by TEPCO to be unrelated to the nuclear accident, due to the rapidness of its onset. He retired as plant manager in early December 2012.  He underwent an operation for the cancer and later suffered a non-fatal stroke.
Yoshida died on 9 July 2013. He was 58 and is survived by his wife, Yoko, and three sons. "If Yoshida wasn’t there, the disaster could have been much worse”, said Reiko Hachisuka, head of a business group in Okuma town. Former Prime Minister Naoto Kan tweeted a tribute, “I bow in respect for his leadership and decision-making".
- Radiation effects from Fukushima Daiichi nuclear disaster
- Lists of nuclear disasters and radioactive incidents
- Fukushima 50
- "In Nuclear Crisis, Crippling Mistrust". New York Times. 12 June 2011.
- "Physicist Michio Kaku: We came close to losing northern Japan". CNN. 1 June 2011.
- "Seismic Damage Information(the 19th Release)" (PDF). Nuclear and Industrial Safety Agency. 13 March 2011. Retrieved 12 April 2011.
- "Ex-chief of Japan nuclear plant has cancer". Google News. Agence France-Presse. 9 December 2011. Retrieved 9 December 2011.
- Tabuchi, Hiroko (9 August 2012). "Videos Shed Light on Chaos at Fukushima as a Nuclear Crisis Unfolded". New York Times. Retrieved 12 August 2012.
- According to the recent book 「死の淵を見た男」(門田隆将、PHP研究所, Dec. 4th, 2012 ISBN978−4−569−80835−2)
- "Masao Yoshida, Nuclear Engineer and Chief at Fukushima Plant, Dies at 58". NY Times. Retrieved 10 July 2013.
- Mainichi article
- Fukushima Nuclear Plant Manager Praised For Heroic Decisions During Meltdown Dies Of Cancer
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