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Transition of International Nuclear Event Scale assessed by NISA
| Date | Assessment |
|---|---|
| March 12, 0:30 | level 3 for loss of coolant in all reactors |
| March 12, evening | level 4 for high level of the radiation monitor |
| March 18 | level 5 to Unit 1, Unit 2, and Unit 3, and level 3 to Unit 4 reactor, for a high possibility of fuel damage |
| April 4 | level 7 |
