Effect of a Non-Linear Control Element on the Quasi-Stationary Operating Behavior of the Compact Sodium-Cooled Nuclear Reactor Installation KNK 1

摘要

The stability of a nuclear reactor without and with feedback by a control system has been investigated. The main objective was to demonstrate whether self-excited oscillations (i.e., limit cycles) can exist or not. Measurements indicated the existence of such limit cycles which may always occur under the influence of a non-linear element. As they were expected to occur in the low frequency region, the transfer functions of the reactor and of the non-linear controller simplified approximations were derived restricted to low frequencies. Applying these approximations for a description in the parameter plane, a distinct insight into the stability of the reactor operated without and with an automatic control system was obtained. (ERA citation 06:002379)