# Circuit solutions of reactimeters

12/05/2019 2019 - #04 Global safety, reliability and diagnostics of nuclear power installations

https://doi.org/10.26583/npe.2019.4.08

### UDC: 621.039.515:621.039.516.2:621.039.514.4

From the standpoint of the general theory of measuring devices and the theory of digital filters, a numbers of questions are considered of a comparative analysis of possible options for algorithmic and circuit realizations of reactimeters. In terms of transient characteristics and transfer functions, the block diagrams of the linear part of the reactimeter are described, as well as the functional algorithms and numerical implementation. Parallel, straight, canonical, symmetrized, lattice and ladder schemes are considered. The corresponding difference equations are given. These results make it possible to compare possible circuit solutions from the point of view of a number of criteria: the complexity of the elemental composition (the number of integrators, adders, multipliers, delay elements), the number of necessary computing operations, the identifiability of the hardware function of the reacimeter, the coherence of the calculated and measured values, the sensitivity to parameter errors etc. The possibility of considering the equations of the reactimeter as autoregressive, which provides the adaptation of the reactimeter under operating conditions, is shown. To ensure the consistency of the calculated and measured reactivity values, the possibility of using identical algorithms in the main computing unit of the direct and inverse problems of nuclear reactor kinetics is shown. The suggested upper and lower reactivity assessments for the reactimeter’ inclusion moment. The implementation of such assessments in the design of the reactimeter allows to minimize the time for the switchover of the reactimeter to the operating mode. For the construction of ladder and lattice circuits some methodical simplifications were used. The database with the parameters of the instrumental functions of the circuit solutions of the reactimeters is available on a public website. A number of tasks and directions for further research are indicated.

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reactimeter instrumental function circuit design variant analysis