Space-dependency analysis of amplitude and decay ratio based on Forsmark noise data: new approach to contraction of space-dependent information on reactor stability

We have proposed a new method of contraction of information on spatial-dependency of feasible reactor stability indexes between the amplitude of local power oscillation and the local decay ratio based on nonlinear stochastic model in the complex normal form. The method is applied to neutron noise data form Forsmark. Demonstrated is the importance of quantitative contraction of local information on spatial-dependency to have a better understanding of the state of reactor's global stability