 Full commercial service was reached on December 21, 1970, just 49 months from the initial groundbreaking ceremony.After delays from nuclear power opponents, Unit 2 was granted a full-term, full-power operating license (DPR-27) on March 8, 1973, almost 1 1/2 years behind the original schedule.Due to steam generator tube degradation and failures caused by intergranular stress corrosion cracking, Unit 1 was operated at approximately 75-80% of full power from December 1979 until October 1983, when replacement steam generators were installed.