Hallam Nuclear Generating Station
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The Hallam Nuclear Generating Station in Nebraska was the site of an experimental graphite-moderated sodium cooled reactor. The graphite moderator was clad in stainless steel. There were issues with the cladding, corrosion and stress cracking led to the failure of the cladding cans. Correcting the failure would have been expensive so the plant was decommissioned and the nuclear components sealed in concrete.
Construction started in 1958. The plant operated from 1962 to 1964. Decommissioning was completed in 1969.[1]
Currently the site holds a fossil-fuel plant, Sheldon Station.