The Koeberg Alert Alliance says the nuclear plant outside Cape Town needs to be shut down.
Alliance spokesperson Mike Kantey claims the ageing Koeberg nuclear power station is not safe to keep running.
Koeberg was designed and constructed with a lifespan of 40 years which come to an end in 2024.
A number of civil society groups are against the plans to extend the lifespan of the nuclear plant.
Kantey says the ageing infrastructure at Koeberg could pose a safety risk if it is not decommissioned.
In addition, he's raised questions about the lack of skilled employees to monitor the situation at the plant as more engineers take their expertise abroad.