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that reasonable variations in the characteristic F are not objectionable. 4. It has been shown that the transient response of such a system is faster than that of a dynamically braked relay servo, and compares favorably with that of the "optimum relay servo."

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A S THE COMPLEXITY of multiloop systems increases, the prediction of their transient performance with the use of conventional linear analytical methods becomes quite difficult. In those cases in which each loop of the system contains several nonlinearities, the application of analog computer techniques becomes an attractive method in the solution of transient performance problems. This paper presents a résumé of an analog computer study of the transient performance of such a complex nonlinear system as represented by a dual-cycle boiling-water-reactor nuclear power plant.As the first step in studying the power plant transient performance, the system was broken down into a number of individual closed loops. These were simulated and analyzed on the analog computer; then, the total system was interconnected and over-all system performance obtained. In the simulation of the individual control loops and in their interconnection, various simplifying assumptions were made. These assumptions were necessary both to limit the complexity of the simulation to the available simulation equipment, and also to cover areas in which detailed information was not immediately available on system phenomena and parameters. From the results obtained, predictions may be made concerning the general trends in the performance of the power plant for various system disturbances, and the importance of system parameters and their effects upon system performance. This information is quite useful in the determination of design compromises in which certain areas of performance must be sacrificed for considerations in other areas.