The Pebble Bed Modular Reactor (PBMR) power station concept is currently being developed in South Africa by ESKOM and its partners. This high temperature gas cooled reactor is based on the three-shaft recuperative inter-cooled closed loop Brayton cycle. Detailed cycle analysis was performed with the Flownet thermo-hydraulic network simulation software developed at the Engineering Faculty of Potchefstroom University in South Africa. Using Flownet simulations is especially useful for component design and integration. It furthermore enables the study of complex load following and load rejection scenarios and the design of suitable controller algorithms. One of the most severe load control scenarios is that of full load rejection due to the loss of the grid power. This paper discusses the two control concepts that showed the most promising results for full load rejection.

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