2011 Japanese nuclear incidents

This is a list of Japanese atomic, nuclear and radiological accidents, incidents and disasters.

United States of America aviators nuked Hiroshima. More than 70,000 fatalities were estimated.

United States of America aviators nuked Nagasaki. More than 39,000 fatalities were estimated.

A US Navy aircraft with one B43 nuclear bomb fell off the aircraft carrier Ticonderoga into 16,200 feet (4,900 m) of water while the ship was underway from Vietnam to Yokosuka, Japan. The weapon was never recovered. Navy documents show it happened about 80 miles (130 km) from the Amami Islands and 200 miles (320 km) from Okinawa.

During preparation of a uranyl nitrate solution, uranium in solution exceeded the critical mass, at a uranium reprocessing facility in Tokai-mura northeast of Tokyo, Japan. Three workers were exposed to (neutron) radiation doses in excess of allowable limits. Two of these workers died. 116 other workers received lesser doses of 1 mSv or greater though not in excess of the allowable limit.

After the 2011 Tōhoku earthquake and tsunami of 11 March, the cooling systems for three reactors (numbers 1, 2 and 4) of the Fukushima II (Fukushima Dai-ni) nuclear power plant were compromised due to damage from the tsunami. Nuclear Engineering International reported that all four units were successfully automatically shut down, but emergency diesel generators at the site were out of order. People were evacuated around 10 kilometres (6.2 mi) from the plant, due to possible radioactive contamination. By 15 March, all four reactors at Daini were reported shutdown, cold and safe.

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