Modal Decomposition Method for BWR Stability Analysis.

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  • VERDU G.
    Departamento de Ingenieria Quimica y Nuclear, Universidad Politecnica de Valencia
  • GINESTAR D.
    Departamento de Matematica Aplicada, Universidad Politecnica de Valencia
  • VIDAL V.
    Departamento de Sistemas Informaticos y Computacion, Universidad Politecnica de Valencia
  • MIRO R.
    Departamento de Ingenieria Quimica y Nuclear, Universidad Politecnica de Valencia

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  • Model Decomposition Method for BWR Stability Analysis
  • Model Decomposition Method for BWR Stab

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Abstract

In-phase and out-of-phase instabilities have been observed in BWR reactors. To improve the safety systems of these reactors, it is necessary to be able to detect in a reliable way these oscillations from the neutronic signals. In this paper a methodology to decompose the neutronic signals in its modal amplitudes is proposed. This decomposition is based on the normal and the adjoint dominant Lambda modes of a static configuration of the reactor core. The calculation of these eigenmodes for a realistic problem is reviewed and the oscillation parameters for the modal decompositions of the neutronic signals from Ringhals reactor have been calculated using the proposed methodology.

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