Multivariate Empirical Mode Decomposition applied to the estimation of the decay ratio and out-of-phase oscillations in BWRs |
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| Affiliation: | 1. División de Ciencias Básicas e Ingeniería, Universidad Autónoma Metropolitana, Iztapalapa, México D.F. 09340, Mexico;2. División de Ciencias Básicas e Ingeniería, Universidad Autónoma Metropolitana, Lerma, Estado de México 52005, Mexico;1. National Centre for Nuclear Research, Świerk, Poland;2. Faculty of Physics, Warsaw University of Technology, Poland;1. Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, 2-12-1-N1-18, Ookayama, Meguro-ku, Tokyo 152-8550, Japan;2. Power Energy Faculty, “Politehnica” University of Bucharest, Splaiul Independentei nr. 313, sector 6, Bucuresti RO-060042, Romania;1. Gazi University, Faculty of Technology, Department of Energy Systems Engineering, Teknikokullar, Ankara, Turkey;2. Gazi University, Institute of Science and Technology, Ankara, Turkey |
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| Abstract: | This work presents a novel method based on the Multivariate Empirical Mode Decomposition (MEMD) to estimate the Decay Ratio (DR) and the apparition of a possible out-of-phase oscillation in Boiling Water Reactors (BWRs). The MEMD algorithm, have the potential to find common oscillatory modes within multivariate data called Intrisic Mode Functions (IMF). Based on this fact, we implement the MEMD technique to find the common oscillatory mode (density wave) in BWRs considering the measurements obtained in each Local Power Range Monitor (LPRM) through the entire core. These IMFs, analyzed simultaneously in time, permit to obtain an estimation of the DR and; also give some considerations about an incipient out-of-phase oscillation through the phase measured between two specific LPRMs. Effectiveness of the proposed method is demonstrated on a specific challenging case from the Forsmark stability benchmark. |
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| Keywords: | Multivariate Empirical Mode Decomposition Forsmark stability benchmark Decay ratio Out-of-phase oscillations Boiling water reactors |
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