The National Nuclear Regulator (NNR) has asked Eskom to undertake additional engineering studies on the Koeberg power station before it can deliberate on its application to extend the long-term operation licence for another 20 years.  Speaking at a briefing to editors in Johannesburg on Thursday, Eskom’s senior manager in its outage centre, Thabiso Moirapula, said that Eskom did not know yet if the licence for the 40-year old plant will be extended before it runs out in July 2024.