The Unit 1 reactor at Diablo Canyon Power Plant was shut down Sunday for scheduled refueling and maintenance work, a Pacific Gas and Electric Co. spokesman said.
During the outage, PG&E employees and temporary contract workers will replace a portion of the nuclear reactor fuel, perform maintenance and test systems and components that are not accessible during regular plant operation, the spokesman said.
Unit 2 will continue to generate electricity while Unit 1 is offline.
PG&E officials estimate more than 150,000 person-hours will be invested in the outage, which will consist of more than 12 major projects, the spokesman said.
“The work we are performing in the weeks ahead supports our strong commitment to operate DCPP in a safe and reliable manner and ensures the continued delivery of clean and affordable electricity to our customers," said Jim Welsch, PG&E vice president of Nuclear Generation and chief nuclear officer.
Each of the two reactor units at Diablo Canyon, located on the coast north of Avila Beach, is refueled about every 20 months. Unit 2 will undergo a planned refueling in the fall.
Together, Diablo Canyon’s twin reactors produce approximately 2,300 megawatts of electricity, about 10 percent of all electricity generated in California and enough to serve more than 3 million people in Northern and Central California.