PG&E turned the key and started reactor No. 2 on Nov. 10, after a five-week-long break for refueling and maintenance.
The refueling involved more than 1,000 additional workers, and the operation replaced a third of the uranium fuel, according to PG&E. The spent fuel will be stored on site. During the shutdown, workers found two switches that had been misaligned for 19 months. The error could have made it difficult for operators to cool the reactor had there had been a reactor emergency.
The two Diablo Canyon reactors produce 2,300 megawatts of electricity, according to PG&E—about 10 percent of electricity produced in California.