<Tr> <Td> Tomsk - 7 </Td> <Td> Seversk </Td> <Td> 1949 </Td> <Td> Uranium enrichment, component manufacturing </Td> </Tr> <Tr> <Td> Krasnoyarsk - 26 </Td> <Td> Zheleznogorsk </Td> <Td> 1950 </Td> <Td> Plutonium production </Td> </Tr> <Tr> <Td> Zlatoust - 36 </Td> <Td> Tryokhgorny </Td> <Td> 1952 </Td> <Td> Warhead assembly </Td> </Tr> <Tr> <Td> Penza - 19 </Td> <Td> Zarechny </Td> <Td> 1955 </Td> <Td> Warhead assembly </Td> </Tr>

When did the soviet union test atomic bomb