Cape Town - Eskom on Tuesday assured MPs that its Koeberg nuclear power plant near Cape Town was designed to withstand both earthquakes and tsunamis.
The electricity utility's operations and planning division MD, Kannan Lakmeeharam, said the design of Koeberg's two reactors was more advanced than those at Japan's Fukushima plant.
A major nuclear crisis is brewing at Fukushima in the wake of the Richter scale 9.0 earthquake that hit Japan last week. Cooling systems have failed at three of the plant's reactors; three massive explosions have rocked the complex; and there are reports of major radiation leaks.
Tens of thousands of people living within a 20km radius of the plant have been evacuated.
Briefing a joint meeting of Parliament's energy and public enterprises portfolio committees, Lakmeeharam said while the reactors at Fukushima were "generation I" design, those at Koeberg were "generation II".
"There are several elements to what is going on in Japan that we have to compare to South Africa. The first is... design of the plant.
"The Fukushima plant is generation I technology; Koeberg is generation II technology, which is a pressurised water reactor. So it's different technology."
'Koeberg can cope with a tsunami'
On Koeberg's ability to withstand a major earthquake, he said the plant was built to withstand a Richter scale 7 seismic shock.
"The Koeberg plant is built on a raft to withstand a Richter scale 7 earthquake. So you've got to look at what is the history of seismic activity in South Africa, and whether that design is sufficient.
"Every nuclear power station is built to what is known as a safety case... based on looking at environmental issues and the past history of seismic activity, and so on."
He told MPs that the emergency power supply for Koeberg's reactors was designed to cope with a tsunami.
"A nuclear power station needs electricity to make sure the cooling water system works. The cooling system for the reactor core is one of the most critical elements of a nuclear power station.
"At Koeberg, the primary source of electricity for this cooling system is the national grid. [Over and above this], we have a dedicated source for Koeberg supplied by gas turbines.
"We [also] have diesel generators on site, and further generators at a higher elevation.
"So we have four layers of security to provide power for the cooling water system. We test them [all] regularly... All of this is overseen by the National Nuclear Regulator.
"So there are some differences; obviously what's happening in Japan is of concern, and we have to keep reviewing our own practices in the light of what we learn," he said.
The largest recorded earthquake in South Africa measured 6.1 on the Richter scale. It struck the Western Cape towns of Tulbagh and Ceres in 1969.
- SAPA