The same day the radioactivity was 4,000 mSv/h indoors of the reactor building.
On the site of the Fukushima 1 (Daiichi) Nuclear Power Plant the quake had an intensity of M 7 on Richter scale, causing the first damage to the facilities, and the initial leakage of radioactive substances.
At 15.42, the subsequent tsunami deprived the nuclear reactors of their cooling functions.
On March 12th, an explosion occurred in the outer structure of unit 1.
On March 14th, unit 3 reactor building explodes.
On March 15th, an explosion causes damage to unit 2 building, another explosion and fire occurred at the No. 4 unit spent fuel pool.
On April 12, Japan’s nuclear safety agency (JNES) and the International Atomic Energy Agency (IAEA) officially raises the Fukushima nuclear disaster to INES Level 7 (more at INES 7 article).
Timeline of the events:
Tatsujiro Suzuki, The Bulletin of the Atomic Scientists.
The Asahi Japan Watch.
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