Nuclear and Industrial Safety Agency raised its rating to 5
The Nuclear and Industrial Safety Agency of Japan rose the International Nuclear and Radiological level at Fukushima Daiichi nuclear plant from 4 (accident with local consequences) to 5 (accident with wider consequences.) It is the same of what was the 1979 US Three Mile Islands and inferior to the 1986 nuclear incident of Cehornobyl that was rated as level 7 (major accident.) However, the Japanese government kept the radius of evacuation to 30 kilometers (18 miles.) The levels are these: 7 – Major Accident; 6 – Serious Accident; 5 – Accident With Wider Consequences; 4 – Accident With Local Consequences; 3 – Serious Incident; 2 – Incident; 1 – Anomaly; 0 – Deviation (No Safety Significance.)
See Insight to Fukushima engineering challenges by the World Nuclear News.