QUALITATIVE-ANALYSIS OF NONLINEAR POWER OSCILLATION IN NSRR

The performance of the automatic control system of NSRR is investigate d experimentally and theoretically in connection with the power oscill ation. A subsystem in the automatic control system relevant to the ons et of the power oscillation is determined, and it is found that the su bsystem possesses nonlinearity. Although the detailed mechanism of the nonlinearity cannot be identified because of lack of signals measured inside the subsystem, the input and output signals imply that the non linearity is a sort of backlash. A simplified reactor dynamic model wi th backlash simulates the dynamics of the NSRR power oscillation.