By Lewins J. D. (Ed.), Becker M.

The assurance during this sequence levels from the experimental to the theoretical, offering anything for all readers dedicated to the secure and important improvement of nuclear strength and its linked applied sciences.

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6b, we can find a domain where the system with negative feedback is stable and of nonminimum phase. The domain corresponds to usual operations of power reactor with negative feedback. As there is an open question of the PSD observed in JRR-1 [62,63], it is necessary to describe a nonminimum phase system where the reactivity is more than critical and the negative feedback transfer function makes the reactor stable. This type of instability in the open loop transfer function is called the soft mode instability [64].

The details have been reported in papers [34,39]. Hence, the formalism developed in Section II can be applied to the analysis of power reactors with complicated reactions from the viewpoint of contraction of information. IV. APPLICATION TO AR MODEL ANALYSIS When a system is characterized by an AR (autoregressive) process, the method of AR model analysis is a powerful tool, since there are useful recursion algorithms for efficient computations [40,41] and popular information criterions such as FPE, AIC, and MDL [42-44].

As there is an open question of the PSD observed in JRR-1 [62,63], it is necessary to describe a nonminimum phase system where the reactivity is more than critical and the negative feedback transfer function makes the reactor stable. This type of instability in the open loop transfer function is called the soft mode instability [64]. There is another type of instability. In the case of an open loop transfer function with more higher-order lag type, there occurs the hard mode instability [64], which is also related to the nonminimum phase.

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