Modal Decomposition Method for BWR Stability Analysis
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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.
- Journal of Nuclear Science and Technology
Journal of Nuclear Science and Technology 35(8), 538-546, 1998-08-25
Atomic Energy Society of Japan