JOHANNESBURG, Gauteng — A series of four contamination events at the Koeberg Nuclear Power Station’s Unit 2 during a tightly scheduled maintenance window has placed South Africa’s nuclear safety protocols under the spotlight. Energy expert and former Eskom executive manager Vally Padayachee, alongside Electricity Minister Kgosientsho Ramokgopa, have publicly addressed the incidents — offering detailed context on what occurred, why workers were not placed at serious risk, and how the episodes fit into a much larger national energy transformation strategy.
The incidents in question arose within an eight-day span during what Padayachee described as a critical nuclear maintenance period. Multiple ventilation outages during this timeframe drew sharp questions about whether Eskom’s engineering redundancy had broken down at the country’s only operational nuclear facility. Padayachee was direct in his assessment: while these non-conformances would not be expected under ideal conditions, no maintenance operation — nuclear or otherwise — can be made completely impervious to anomalies. What matters most, he argued, is how an organization responds. In his view, Eskom deployed the correct resources, followed the appropriate steps, and successfully confined the contamination within the designated maintenance and containment areas, preventing any escalation to a level of serious concern.
Understanding the Robotic Probing Contamination Events
Eskom officially classified the incidents as the release of routine airborne crud triggered during robotic probing operations. Padayachee unpacked the technical reality behind this characterization. During these inspections, robotic probes are sent into metal pipes — conduits that generally carry radiation-related substances alongside water and other materials — to assess structural integrity. The physical action of the probes dislodged particulate matter and residue from the interior pipe surfaces, which then became airborne within the maintenance zone where workers were stationed.
Critically, Padayachee stressed that the concentration of the airborne contamination did not reach levels warranting serious alarm. Nonetheless, as a standard precaution, all affected personnel were immediately removed for medical evaluation and were subsequently declared medically fit.
Aging Infrastructure or Proven Longevity?
With Koeberg now surpassing four decades of operation, critics have questioned whether Unit 2’s recently approved 20-year life extension to 2046 was premature. Padayachee pushed back firmly against this narrative. He cited that extending nuclear facility lifespans from 40 years to 60 or even 80 years is far from unprecedented. Globally, 113 nuclear units have undergone similar life extensions. Koeberg’s Units 1 and 2, he noted, were subjected to exhaustive evaluations conducted in partnership with both the National Nuclear Regulator and the International Atomic Energy Agency (IAEA) before the extension was formally approved. Age alone, Padayachee maintained, does not equate to ineffectiveness — provided the equipment receives proper, sustained maintenance.
The 5.2 GW Nuclear Expansion and the SMR Business Case
Beyond Koeberg’s immediate operational picture, the conversation turned to South Africa’s ambitious plan, championed by Electricity Minister Kgosientsho Ramokgopa, to bring an additional 5.2 gigawatts — or approximately 5,000 megawatts — of new nuclear capacity online by 2039. This target is embedded within the Integrated Resource Plan 2025.
Padayachee, who described himself as closely involved with the initiative, argued that the plan is economically viable despite the country’s well-documented fiscal challenges. The linchpin of the strategy is the adoption of Small Modular Reactors (SMRs) rather than the construction of large-scale facilities on the model of Koeberg. SMRs are defined as reactors producing up to 300 megawatts, but their true advantage lies in their modularity: they can be built in units as compact as 10 megawatts and scaled upward by simply adding more modules. A 20-megawatt installation would require two modules; a 100-megawatt deployment would use ten.
Because SMRs can be manufactured in factory settings and then transported to sites for rapid installation virtually anywhere in the country, Padayachee argued that upfront capital costs become far more manageable. When paired with long-term power purchase agreements (PPAs) structured over 25 to 50 years, and supported by economies of scale as module production ramps up, he expressed confidence that the cost factor should be the least of the government’s concerns. Exact pricing, he acknowledged, will depend on the number of modules deployed and the unit cost of the first installations.
Bridging the 2026–2039 Generation Gap Without Blackouts
One of the most pressing questions facing South Africa’s energy sector is how to navigate the period between now and 2039 — when new nuclear capacity is expected to come online — without triggering widespread power shortfalls, particularly as aging coal-fired plants are progressively retired.
Padayachee drew a clear distinction between dispatchable energy technologies — coal, nuclear, gas, and hydro — which provide continuous, on-demand power, and intermittent renewable sources such as solar and wind. He explained that from 2030 onward, Eskom will begin decommissioning older coal stations that have reached the end of their operational lives. However, not all coal capacity will be retired. Eskom has made a deliberate decision to extend the life of certain qualifying coal plants that are fully depreciated, still performing at reasonable levels, and producing electricity at low cost.
Addressing environmental concerns directly, Padayachee clarified that coal’s primary drawback is its emissions profile rather than an inherent technological flaw. Eskom is simultaneously launching a program to retrofit these extended-life coal stations with emission-cleaning technologies, bringing output below the limits mandated by the Department of Environmental Affairs.
Nuclear as the Non-Negotiable Pillar of Net Zero
In closing, Padayachee made a pointed case that South Africa — and indeed the world — cannot achieve net-zero emissions targets by 2050 relying exclusively on solar and wind energy. Nuclear power, he insisted, is an essential component of any credible decarbonization pathway. To reflect this, Eskom has strategically separated its net-zero and green energy commitments from its coal station life-extension decisions, treating them as parallel but distinct tracks within a broader energy architecture designed to balance affordability, reliability, and environmental responsibility.
