<Tr> <Td> </Td> <Td> PWR </Td> <Td> AP1000 </Td> <Td> Planned </Td> <Td> 1000 </Td> <Td> 1135 </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> </Td> <Td> PWR </Td> <Td> AP1000 </Td> <Td> Planned </Td> <Td> 1000 </Td> <Td> 1135 </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Virgil C. Summer </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> Operational </Td> <Td> </Td> <Td> 1,000 </Td> <Td> </Td> <Td> 000000001984 - 01 - 01 - 0000 1 January 1984 </Td> <Td> </Td> </Tr> <Tr> <Td> Watts Bar </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> Operational </Td> <Td> </Td> <Td> 1,121 </Td> <Td> </Td> <Td> 000000001996 - 05 - 27 - 0000 27 May 1996 </Td> <Td> </Td> </Tr>

When did the united states become a nuclear power