jan 1, 1997 - Tokaimura nuclear accident

Description:

Most likely due to improper extinguishing of the fire, a small explosion occurred. The explosion broke windows allowing smoke and radiation to escape into the surrounding area. Plant surveillance confirmed the windows and doors affected by the explosion had not been repaired for a few hours subjecting the surrounding area to radioactivity. officials confirmed at least 21 workers had been exposed to radioactivity 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.[13] Aerial views over the nuclear processing plant building showed a damaged roof from the fire and explosion allowing continued external radiation exposure.

Added to timeline:

Date: