On the Range of Validity of Nonlinear Reactor Dynamics

Space-independent, conventional, nonlinear reactor dynamics equations are derived by a second-order perturbation method. A general criterion is derived indicating the conditions under which it is purposeful to use the nonlinear equations as such. It is shown that the range of validity of nonlinear dynamics is not unlimited and in case of large deviations from equilibrium higher order perturbation terms are required.