1. Chernobyl Nuclear Power Plant, Pripyat, Ukraine.
International Nuclear Event Scale Level: 7.
2. Fukushima Nuclear Power Plant, Fukushima, Japan.
International Nuclear Event Scale Level: 7.
3. Mayak Nuclear Fuel Reprocessing Plant, Ozyorsk, Russia.
International Nuclear Event Scale Level: 6.
4. Three Mile Island Nuclear Power Plant, Pennsylvania, USA.
International Nuclear Event Scale Level: 5.
5. Windscale Piles, Cumberland (Now Cumbria), UK.
International Nuclear Event Scale Level: 5.
6. JCO Uranium Reprocessing Facility, Tokai, Japan.
International Nuclear Event Scale Level: 4.
7. Bohunice Nuclear Power Plant, Trnava District, Slovakia.
International Nuclear Event Scale Level: 4.
8. Lucens Reactor, Vaud, Switzerland.
International Nuclear Event Scale Level: 4.
9. National Reactor Testing Station, Idaho, USA.
International Nuclear Event Scale Level: 4.
10. Davis-Besse Nuclear Power Station, Ohio, USA.
International Nuclear Event Scale Level: 3.
Source: Tech Graffiti
Photo by Pedro Moura Pinheiro