The first of Koeberg nuclear power station’s long-awaited six new replacement steam generators arrived at the plant 30th September. This is the result of exceptional teamwork and collaboration and heralds a key milestone for Africa’s only nuclear power station. The steam generators weigh some 380 tonnes each and are about 20 metres long. The first three new generators will be installed into Unit 1 between February and June 2021.
They are being transported by road from Cape Town harbour, covering the distance of about 40 kms over a period of eight hours, per steam generator. The trailer used to transport the generators is the longest in South Africa: 42 metres in length and requiring four trucks to transport each of the steam generators.
The new steam generators are intended to extend the operational life of Eskom’s Koeberg nuclear power station.
They will be housed in the Replacement Steam Generator Facility that has been constructed on the Koeberg site until the old steam generators are removed from the plant during the unit’s next outage. The steam generator replacement has been planned into Koeberg’s outage schedule and Eskom’s generation plan.
As part of the programme to extend the power station’s operating life by 20 years, first approved by the Eskom board in 2010, the new steam generators will replace the current steam generators that have been in operation at Koeberg since the first unit was connected to the national electricity grid in 1984. The replacement of the old steam generators is a key part of the larger programme to extend Koeberg’s operating life, budgeted to cost an estimated R20 billion, and is reported as the best investment into sustainable and less carbon intensive electricity generation infrastructure that Eskom can buy.
The replacement of steam generators at Unit 2, which is currently undergoing a refuelling outage until mid-October, has also been planned to coincide with the unit’s next maintenance and refuelling outage in order to minimise generation downtime on the unit. The replacement will occur between January and May 2022.
The project’s extensive engineering analyses and safety studies concluded that the new steam generators can be safely installed, commissioned, and operated, enabling the power station to continue generating electricity beyond its original 40 years’ operational life. Steam generator replacement is the most intensive and expensive project that a nuclear power station can undertake and several stations internationally have already done it successfully. In addition, the analyses and other studies undertaken are being reviewed by the National Nuclear Regulator, to approve the installation subsequent to their review and acceptance.
On removal from the plant, the current steam generators will be stored on the Koeberg site where they will be packaged and dismantled for final disposal at a national nuclear waste repository, which is the responsibility of the National Radioactive Waste Disposal Institute (NRWDI).
For more information visit: www.eskom.co.za