Eskom responds to Koeberg cracks

In response to our press release Cracks in Koeberg Safety Claims Eskom released a statement (full text given below) on 12 February 2021. This statement ignores several of the issues we raised, obfuscates others, and provides some further alarming information.

Maintenance and testing is being done …
The Eskom statement says “repairs have been implemented” which sounds initially reassuring. However, the report itself describes the repairs in progress at the time as follows:Extract from report: neither ideal nor sustainable

The report goes on to say “The repairs are non-structural and only about 11% of the structures’ surfaces have been rehabilitated. The areas adjacent to the patched areas will now corrode at an accelerated rate.” This means the problem will cascade, and just happen faster around any patch repairs.

How are the latest repairs going?
We have been asked this many times, but we don’t know. To find out, one approach is to use the Promotion of Access to Information Act (PAIA) again. Judging from the previous response from Eskom, this could mean another 143 day wait, followed by a 50% redacted report.

We know this is the latest study done, as per the PAIA request wording. There are two possibilities: either further repairs are not yet complete, or they are complete but no study has been done evaluating how effective they were.

Testing has been rushed and incomplete
Another Eskom document which we are are currently analysing refers to testing done around 2015. In a section headed “Seismic Margin Assessment” it reads “The time to conduct this study was limited, and as there were no planned outages during that period, containment entry was not possible.” It seems that this ‘test’ did not include looking at the inside of the containment building. More will be released about that document soon.

Every ten years?
Eskom tries to reassure the public that they perform “Integrated Leak Rate Tests (ILRT) on a 10-yearly basis.” Far from being reassuring, this seems to indicate a shocking complacency. Given the potential consequences of a failure of the containment building, is it sufficient to potentially allow a leak to be in place undetected for 9 years until the next test? What is more, a gradual increase in pressure during a test is not the same as the shock and shrapnel that would result from a rupture of one of the reactor vessels due to steam overpressure in a loss of coolant incident. How is it possible to be sure that the delaminating concrete domes would be able to prevent the release of radioactive material?

Communication from within a culture of complacency…
One issue the statement simply ignores is Eskom’s slow response to requests made under PAIA. The act says a response must be given ‘as soon as reasonably possible, but in any event within 30 days’. Eskom took 143 days to answer this PAIA request. In their statement, they do not acknowledge this failing nor apologise for it, let alone undertake to improve. This is a pattern of behaviour from within a culture of complacency – we have not been able to find a single case where Eskom have responded to a PAIA request for nuclear related information within 30 days over the past year, and we suspect the problem is more general than that. ‘Because of Covid’ is not a good enough reason to take months for every request.

Half the contents withheld from the public…
Another issue that the Eskom statement fails to respond to is that about half the technical content of the released report has been blacked out. The report does still include lines like “The current interventions are neither ideal nor sustainable” and “The Risk is level I (highest), with a Consequence Level 6 (highest)“. Given the contents of the information that was released, one can only speculate what technical information Eskom considered to be so ‘sensitive‘ that is had to be blacked out. We acknowledge it is quite justified to redact information such as personal details to protect privacy, and for other limited reasons. But the history of technical problems at Koeberg? What possible justifiable reason can there be for keeping that secret?

In an Orwellian twist…
Eskom’s web site celebrates how it was awarded the Golden Key‘ award in 2015 for openness and responsiveness. None other than the Saxonwold shabeen-frequenting Brian Molefe (CEO at the time) is still quoted there as saying Eskom “has not wavered from its commitment to transparency, openness and responsiveness“.

An unfinished sentence?
The Eskom statement claims in the title that the Koeberg containment buildings are “capable of withstanding the most severe accident.” This is meaningless without the sentence being completed. The most severe accident what? The most severe accident listed in an appendix? As it stands it is just an empty platitude.

For example, Eskom has said before that the earthquake protection features of Koeberg were designed to withstand up to magnitude 7. That means it is not designed to withstand a magnitude 7.1 earthquake, which is also a ‘most severe accident’. Once a risk is acknowledged, the probability can be calculated and a meaningful discussion can be had. But to claim there is zero risk, as Eskom does here, is disingenuous. This is not the first time Eskom has misled the public about risks at Koeberg.

Another twenty years?
Eskom has said it will soon be requesting permission from the Nuclear Regulator to extend the life of the Koeberg plant by another twenty years. The pattern of foot dragging delays when answering PAIA requests and the arbitrary redactions strengthens the impression that Eskom would prefer that the public is not informed about Koeberg. By causing these delays, Eskom is effectively undermining the ability of the public to participate meaningfully in the life extension decision.

What else?
The containment buildings were designed to last 40 years, and we now know that has not turned out well. In Eskom’s own words describing the chloride damage, “This phenomenon was not fully understood when the structures were designed.” This prompts some questions, especially when considering extending the life of the plant by twenty years:

  • What else was not fully understood when Koeberg was designed?
  • Are there areas where rebar still hidden by concrete has also corroded?
  • Have any of the other safety layers deteriorated faster than expected due the marine environment or radiation induced embrittlement?
  • Are there any inaccessible components or pipes which cannot be physically checked for deterioration?
  • What will be the total cost of all these repairs, plus the refurbishment costs, plus twenty more years of nuclear insurance premiums, and what effect will that have on the price of electricity?
  • Is it perhaps best to avoid the these costs and eliminate any long term risks by shutting down Koeberg as planned in 2024?

In conclusion…
It is all too easy to slip into complacency, and to think that since the reactor vessel will never actually rupture, the containment building will never really be put to the test. In the same way there are seatbelts in cars, there are containment buildings at nuclear plants. If they were never needed, they wouldn’t be there.

Should there be a loss of coolant incident resulting in a meltdown and the containment buildings fail, hundreds of thousands of people would have to evacuated and would not be able to return to their homes. Home owners in affected areas would be unable to sell or live in their homes, although they would still be liable for any bank loan repayments. Western Cape wine would be shunned, and the Cape Tourism industry would collapse – a holiday in the Cape would sound less attractive than a beach holiday in Fukushima.

The magnitude of the potential consequences mean that it is a very poor idea to leave Koeberg running for another 23 years, in the hope that this time Eskom will get maintenance and repairs right. If Eskom was good at maintenance, after all, we would not be having load shedding.


The Koeberg site is the ideal location for the battery storage that was mentioned during SONA last week. There is space, and the grid connection infrastructure is already in place. That is the opportunity to turn Koeberg from a deteriorating danger into the first example in South Africa of a safe, new and efficient technology.

Here is the full Eskom response statement:

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