Influence of the main neutron absorbers poisons coupled to the Point Kinetics model by the Rosenbrock’s method

Natália Barros Schaun; Fernanda Tumelero; Claudio Zen Petersen

doi:10.15392/bjrs.v10i1.1705

Authors

Natália Barros Schaun Universidade Federal de Pelotas https://orcid.org/0000-0002-6531-1817
Fernanda Tumelero Universidade Federal de Pelotas
Claudio Zen Petersen Universidade Federal de Pelotas

DOI:

https://doi.org/10.15392/bjrs.v10i1.1705

Keywords:

Rosenbrock’s Method, Neutron Point Kinetics, Temperature feedback, Neutron poisons.

Abstract

In this work, the Neutron Point Kinetics equations are solved for six groups of delayed neutron precursors and different types of ramp reactivity, considering the temperature effects by the Rosenbrock’s method, to verify the methodology. Furthermore, the classical model is solved by inserting the effects of the main neutron poisons, considering constant reactivity for a group of precursors. The simulation consists of inserting a negative constant reactivity, simulating a reactor in its shutdown phase. Then, positive constant reactivity is inserted, simulating power resumption in a reactor already poisoned, to analyzing the final behavior of the neutron density. The simulation achieved its goal of simulating the behavior of the neutron poisons, so that the graphs make physical sense as expected. Therefore, it was found that the proposed method overcame the stiffness of the Neutron Point Kinetics model, and also solved a nonlinear problem by the inclusion of temperature and neutron poisons in the system.

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