Abstract
Abstract The paper describes how a detailed control engineering study of the boiler feedwater system on the UKAEA Prototype Fast Reactor was able to pinpoint the causes of the three distinct modes of limit-cycle oscillation experienced on the operating plant. On the basis of this understanding, the feedwater control system was redesigned to eliminate all the modes of oscillation and to improve disturbance rejection. Because of the strongly condition-dependent nature of some of the key control parameters, the final design incorporated gain-scheduling based on measurable plant parameters in order to give stability and good performance over the full range of power operation.
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