Wavelet approach for analysis of neutronic power using data of Ringhals stability benchmark |
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Authors: | Gilberto Espinosa-Paredes, Alejandro Nú ez-Carrera, Alfonso Prieto-Guerrero,Miguel Cece as |
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Affiliation: | aDivisión de Ciencias Básicas e Ingeniería, Universidad Autónoma Metropolitana-Iztapalapa, Av. San Rafael Atlixco, 186, Col. Vicentina, 09340 México D.F., Mexico;bComisión Nacional de Seguridad Nuclear y Salvaguardias, Dr. Barragán 779, Col. Narvarte, 03020 México D.F., Mexico;cInstituto de Investigaciones Eléctricas, Av. Reforma 113, Col. Palmira, 62490 Cuernavaca, Morelos, Mexico |
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Abstract: | We have studied neutronic power oscillation in a boiling water nuclear reactor for three different scenarios of the Ringhals stability benchmark with a proposed wavelets-based method: the first scenario is a stable operating state which was considered as a base case in this study, and the last two correspond to unstable operating conditions of in-phase and out-of-phase events. The results obtained with the methodology presented here suggest that a wavelet-based method can help the understanding and monitoring of the power dynamics in boiling water nuclear reactors. The stability parameters frequency and decay ratio were calculated as a function of time, based on the theory of wavelet ridges. This method allows us to analyze both stationary and highly non-stationary signals. The resonant frequencies of the oscillation are consistent with previous measurements or calculated values. |
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