On , March 18, 2011 20:01 JST (07:01:00 Friday March 18 ET) NHK reports that the Japanese government raised its rating of the problems at the Fukushima Daiichi nuclear plant to Level 5 on the International Nuclear and Radiological Event Scale.
To put this is context this is a list of the level 5 and above events to date.
Level 7
Chernobyl, 1986 — Widespread health and environmental effects. External release of a significant fraction of reactor core inventory.
Level 6
Kyshtym, Russia, 1957 — Significant release of radioactive material to the environment from explosion of a high activity waste tank.
Level 5
Windscale Pile, UK, 1957 — Release of radioactive material to the environment following a fire in a reactor
core.
Three Mile Island, USA, 1979 — Severe damage to the reactor core.
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