Tokaimura Tragedy - History's Worst Criticality Accident

On September 30, 1999, the Tokaimura nuclear accident became the worst criticality accident in modern nuclear history. At a uranium processing facility in Japan, workers accidentally triggered a self-sustaining nuclear reaction while preparing fuel for an experimental reactor. One of the technicians, Hisashi Ouchi, received a massive radiation dose and spent 83 days in intensive medical care before his death. Over time, his story spread across the internet with misleading claims about what really happened. This [HALF-LIFE HISTORY] is the true story. This video has been independently fact-checked by experts at the American Nuclear Society. “A Slow Death 83 Days Of Radiation” by NHK TV Crew: https://archive.org/details/ASlowDeath83DaysOfRadiation/mode/2up SOURCES: A Slow Death: 83 Days of Radiation Sickness. Translated by Maho Harada, Vertical, 2008. Internet Archive, https://archive.org/details/ASlowDeath83DaysOfRadiation/mode/2up. Accessed 10 Mar. 2026. Tokaimura Nuclear Accident. Directed by NHK TV Crew, NHK (Japan Broadcasting Corporation), 2009. https://www.youtube.com/watch?v=ZWomuWd7-to Davis, M. H. "The Japan Criticality Accident." National Republican, 2000, web.archive.org/web/20230429203013/nationalrep.org. Accessed 10 Mar. 2026. https://web.archive.org/web/20230429203013/http://nationalrep.org/2000/Japan%20Criticality%20Accident%20-%20Davis.pdf International Atomic Energy Agency. Report on the Preliminary Fact Finding Mission Following the Accident at the Nuclear Fuel Processing Facility in Tokaimura, Japan. IAEA, 1999. IAEA Publications, www-pub.iaea.org/MTCD/publications/PDF/TOAC_web.pdf. International Atomic Energy Agency. Report on the Preliminary Fact Finding Mission Following the Accident at the Nuclear Fuel Processing Facility in Tokaimura, Japan. IAEA, 1999. IAEA, www-ns.iaea.org/downloads/iec/tokaimura-report.pdf. Ryan, Michael E. "The Tokaimura Accident." National Center for Case Study Teaching in Science, University at Buffalo, 25 June 2001. Internet Archive, web.archive.org/web/20190819091553/sciencecases.lib.buffalo.edu. United States Nuclear Regulatory Commission. "Attachment 1: Review of the Tokai-mura Criticality Accident and Lessons Learned." SECY-00-0085, 12 Apr. 2000, www.nrc.gov/reading-rm/doc-collections/commission/secys/2000/secy2000-0085/attachment1.pdf. Sokolov, Yuri. Human Errors Analysis and Safety Assessment in Industrial Facilities. Interim Report IR-05-003, International Institute for Applied Systems Analysis, Jan. 2005, pure.iiasa.ac.at/id/eprint/7832/1/IR-05-003.pdf. Futami, Satoru. (2000). International Symposium on The Criticality Accident in Tokaimura: Medical Aspects of Radiation Emergency. “The JCO Criticality Accident.” The Wall Street Journal, 30 Sept. 1999. Archive.ph, https://archive.ph/20230602144147/https://www.wsj.com/amp/articles/SB938689300261376572. 💪 JOIN [THE FACILITY] for members-only live streams, behind-the-scenes posts, and the official Discord: https://www.patreon.com/kylehill 👕 THE INTERNET IS DEAD MERCH OUT NOW! https://shop.kylehill.net 🎥 SUB TO THE GAMING CHANNEL: https://www.youtube.com/channel/UCfTNPE8mXGBZPC1nfVtOJTw ✅ MANDATORY LIKE, SUBSCRIBE, AND TURN ON NOTIFICATIONS 📲 FOLLOW ME ON SOCIETY-RUINING SOCIAL MEDIA: 📷 https://www.instagram.com/sci_Phile/ 😎: Kyle 🎬: Charles Shattuck 🎞: Kevin Onofreo ✂: Nate Berger 📝: @adef 🤖: @clairemax 🎨: Thorsten Denk 🎼: @mey 🎹: bensound.com 🎨: Mr. Mass https://youtube.com/c/MysteryGiftMovie 🎵: freesound.org