<Table> <Tr> <Th_colspan="2"> Soviet atomic bomb project </Th> </Tr> <Tr> <Td_colspan="2"> Russian physicists Andrei Sakharov (left) and Igor Kurchatov, who led the program to success . </Td> </Tr> <Tr> <Th> Operational scope </Th> <Td> Operational R&D </Td> </Tr> <Tr> <Th> Location </Th> <Td> Atomgrad, Semipalatinsk, Chagan Lake </Td> </Tr> <Tr> <Th> Planned by </Th> <Td> NKVD, NKGB GRU, MGB, PGU </Td> </Tr> <Tr> <Th> Date </Th> <Td> 1940--49 </Td> </Tr> <Tr> <Th> Executed by </Th> <Td> Soviet Union </Td> </Tr> <Tr> <Th> Outcome </Th> <Td> The successful development of nuclear weapons . </Td> </Tr> </Table> <Tr> <Th_colspan="2"> Soviet atomic bomb project </Th> </Tr>

When did the soviet union develop a nuclear weapon