Experiences with Binary Periodic Signals for Dynamic Testing at the HFIR

The power-to-reactivity frequency response of the High-Flux Isotope Reactor (HFIR) was measured over the range 0.01 to 5 Hz using periodic binary input signals introduced with normal system control rods. These results served to validate the theoretical model used in the HFIR control and safety studies and to aid in assessing this testing procedure for use in large power reactors where special test equipment or interference with normal operation cannot be tolerated.