Conversation so far:
when did the development of nuclear science begin
The science of atomic radiation, atomic change and nuclear fission was developed from 1895 to 1945, much of it in the last six of those years.
what was nuclear science focused on
Over 1939-45, most development was focused on the atomic bomb.
did the focus of nuclear science change from developing the atomic bomb
Since 1956 the prime focus has been on the technological evolution of reliable nuclear power plants.
when was the first nuclear power plant developed
The first nuclear reactor to produce electricity was the small Experimental Breeder reactor in Idaho, USA. The reactor started up in December 1951.

Question: who designed it
Self-contained rewrite: who designed the first nuclear power plant