Tokaimura nuclear accident
Coordinates: 36°28′47.00″N 140°33′13.24″E / 36.4797222°N 140.5536778°E
There have been two Tokaimura nuclear accidents at the nuclear facility at Tōkai, Ibaraki:
When time is not specified, in most cases the 1999 incident is the one being referred to.
The first Tokaimura nuclear accident was the accident which occurred on 11 March 1997, in a nuclear reprocessing plant of the Dōnen (Power Reactor and Nuclear Fuel Development Corporation). Another name is the Dōnen accident (動燃事故 Dōnen jiko?).
On the night of Tuesday 11 March 1997, a small explosion occurred in a nuclear reprocessing plant of the Dōnen. Windows were smashed and smoke escaped to the atmosphere. On Thursday, workers repaired thirty broken windows and three doors with duct tape. They had been damaged during the blast. At least 37 workers were exposed to elevated levels of radiation during the incident.
A week after the event, meteorological officials detected unusually high levels of caesium 40 kilometers (25 miles) south-west of the plant.
The second and more serious Tokaimura nuclear accident (Japanese: 東海村JCO臨界事故Tōkai-mura JCO-rinkai-jiko) indicates the nuclear disaster which occurred on 30 September 1999, resulting in two deaths. It was the worst civilian nuclear radiation accident in Japan prior to the Fukushima Daiichi nuclear disaster of 2011.
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