Pelindaba: Secret, apartheid-era technology for highly enriched uranium dismantled
Pelindaba and its uranium-enrichment facility at Valindaba were kept secret during the apartheid era because they were enriching uranium for warheads under the guise of fuel supply, by Sarah Wild, Business Day, 1 September 2011
South Africa is the only country in the world to have willingly halted its nuclear weapons programme, through the Treaty of Pelindaba of 1996. But the old infrastructure remains.
The US provided the Safari-1 reactor through its Atoms for Peace programme, and also supplied the facility with its highly enriched uranium (HEU).