Koeberg Unit 1 outage delayed to allow stability of the power system

Thursday, 08 December 2022: After careful assessment of the current state of the national grid, Eskom has decided to delay the start of the outage of Unit 1 of the Koeberg Nuclear Power Station to allow time to stabilise the system and the recovery of some generation capacity. Koeberg Unit 1 has been online for 407 days since the last outage.

The Koeberg Unit 1 refuelling and maintenance outage is therefore planned to now commence on Saturday 10 December 2022, should the grid conditions have recovered to ensure stability of the system.

“While Eskom is ready to commence with the outage, with the contractors and all the requisite resources on standby, grid stability is an important consideration prior to shutting down the Unit 1 reactor to commence the maintenance and refuelling outage,” said Sadika Touffie, Acting Chief Nuclear Officer. “This is going to be a long but necessary outage – the first of its kind for Koeberg. Eskom has taken care to ensure no undue delays are experienced once the project gets under way.”

The outage will be for a duration of approximately six months. The extended unavailability of the unit is due to the planned long outages does mean the electricity supply system may be under additional strain during the outage.

This will be the 26th refuelling outage on Unit 1 since commissioning and will also see the replacement of the unit’s three steam generators as part of the long-term operation program of the power station. The reactor pressure vessel head on this unit was replaced several years ago.

Koeberg Nuclear Power Station is an important part of the Eskom generating fleet due to its reliable operation, low primary energy costs, its strategic location in the Western Cape to stabilise the national electricity grid and the fact that it is a clean source of energy.

Unlike other types of power stations, where fuel can be added to continue generating power, the fuel at a nuclear power station is sealed inside a reactor vessel, which is opened for refuelling every 15 to 18 months. This is also a time when the station will perform certain required inspections on equipment and perform more intrusive maintenance that cannot be performed when the unit is online.

The rigorous maintenance, inspection and testing programmes are some of the critical activities that ensures that the plant remains safe and able to deliver this reliable level of performance.

The Koeberg units, at 920MW each, are the largest generating units on the African continent. Their safe and reliable operation is a significant contributor to meeting the country’s electricity demand. The Koeberg outages are planned at times of the year when the impact on the overall electricity supply is minimised as far as possible.


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