<Tr> <Th> Location </Th> <Td> Mayak, Ozyorsk, Chelyabinsk Oblast, Russia </Td> </Tr> <Tr> <Th> Coordinates </Th> <Td> 55 ° 42 ′ 45" N 60 ° 50 ′ 53" E ﻿ / ﻿ 55.71250 ° N 60.84806 ° E ﻿ / 55.71250; 60.84806 </Td> </Tr> <Tr> <Th> Type </Th> <Td> Nuclear Accident </Td> </Tr> <Tr> <Th> Outcome </Th> <Td> INES Level 6 (serious accident) </Td> </Tr>

Mayak or kyshtym nuclear complex (soviet union) 29 september 1957