Koeberg to perform full load rejection test on Unit 1 on Saturday, 30 December 2023

Friday, 29 December 2023: On Saturday, 30 December 2023, Koeberg Nuclear Power Station will be performing a full load rejection test on Unit 1. This is the final test that needs to be performed following the installation of the new steam generators.

The purpose of the full load rejection test is to verify and demonstrate the ability of the unit to supply its auxiliary load and return to steady state conditions following a sudden disconnection from the national grid. The South African Grid Code (SAGC) requires that units be tested if modifications are made that could impact their capability to meet the SAGC requirements. As part of the steam generator replacement project, significant changes (modifications) were made on numerous plant components, including control systems. Therefore, in line with SAGC, the response of the unit to a full load rejection incident needs to be tested and verified.

Prior to and in preparation of the full load rejection test, various commissioning tests were performed successfully. As a result, Eskom is confident that this test will be a success. However, in the unlikely event of the test failing and resulting in a unit trip, the Koeberg team is ready to respond and will work towards safely returning the unit back to service as soon as possible.


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