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Neutron lifetimes and return fraction experimental determinations and analyses in several configurations of the IPEN/MB-01 reactor and its impact in the reactivity system calculation

Grant number: 13/14908-4
Support type:Scholarships in Brazil - Doctorate
Effective date (Start): November 01, 2013
Effective date (End): August 31, 2017
Field of knowledge:Engineering - Nuclear Engineering - Reactor Technologies
Principal researcher:Adimir dos Santos
Grantee:Eduardo Gonnelli
Home Institution: Instituto de Pesquisas Energéticas e Nucleares (IPEN). Secretaria de Desenvolvimento Econômico (São Paulo - Estado). São Paulo , SP, Brazil


This work proposes the development of a new methodology for measurement of the reactivity in the IPEN/MB-01 research reactor facility, based on microscopic and macroscopic noise experiments and the Two-Region point kinetic equations model. Differently from the other point kinetic theoretical models, the Two-Region model assumed in this work takes into account the nuclear reactor how a coupled system, which constitute the theoretical basis of all mathematical development, contemplate both regions of the reactor (core and reflector).The study of the reflector effect and its impact in the reactivity is an original fact and, to make possible the viability of this study, the kinetic parameters related to the reflector must be obtained. The main advantage of this new methodology is to obtain the kinetic parameters from the reflector in a purely experimental way, without requiring any secondary parameters, i.e., eliminating all parameters that are difficult to measure or calculate. In this way, Rossi-Alfa and Spectral Densities will be performed in the IPEN/MB-01 facility and, from the Two-Region point kinetic equations model, will be obtained the theoretical expressions for the Auto Power Spectral Densities (APSD) and for the Cross Power Spectral Densities (CPSD), which will be used for least squares fit of the experimental data. The prompt neutron generation time, the neutron lifetimes in the reflector and the neutron return fraction from the reflector to the core will be derived from the fitting and these parameters will be used to calculate the reactivity from the Two-Region Inhour equation.

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