The turbine on Unit 2 of the Koeberg Nuclear Power Station tripped at around ten pm on Friday while personnel were replacing a failed electronic turbine protection module.
Eskom spokesperson Sikonathi Mantshantsha says the reactor responded to the turbine trip by reducing power and it remained critical, as designed, with no nuclear safety consequences.
"This enabled the unit to be returned to service quickly and the unit was resynchronized to the grid just before 07h00 on Saturday," he said.
"Over the course of the day the unit will increase power back up to full load. The unit had been online for an uninterrupted 145 days when this occurred."
Mantshantsha also confirmed that Stage 4 load shedding will remain in force until further notice.
