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Tokaimura nuclear accidentdumo
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Tōkai-mura Location of Tōkai-mura in Japan | |
Date | 30 September 1999 |
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Location | Tōkai, Ibaraki, Japan |
Coordinates | |
Type | Nuclear criticality accident |
Cause | Uncontrolled nuclear fission after uranyl nitrate overload |
Outcome | INES Level 4 (accident with local consequences) |
Deaths | 2 |
Non-fatal injuries | 667 contaminated |
Inquiries | World Nuclear Association |
Timeline of 1999 Accident | |||
Day | Time | Event/action | Affected parties |
30 September 1999 | 10:35AM | Criticality event occurred setting off radiation monitors and alarms, evacuation begins and employees exposed to radiation[22] | 3 Workers; Hisashi Ouchi, Masato Shinohara and Yutaka Yokokawa |
30 September | Until 23:30PM | (5 hours later) STA confirms continuing chain reactions, Tokaimura sets up headquarters for the incidents, (12 hours later) broadcasts all surrounding residents to evacuate, informed Japan's leadership and cease all crop and water usage | Tokaimura City and National Leadership |
1 October 1999 | All day | Road blocks implemented, shelter in place lifted but schools closed all day, water drainage initiated to stop chain reaction. | All residents |
2 October 1999 | All day | Health checks conducted on all residents measuring radiation, schools reopened and government press conferences held | All residents |