Nuclear Science and Engineering / Volume 129 / Number 2 / June 1998 / Pages 203-208
Technical Note / dx.doi.org/10.13182/NSE98-A1976
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Plant signals from the Borssele nuclear power plant in the Netherlands were analyzed to investigate the characteristics of neutron flux fluctuation in the low-frequency range 0 to 0.5 Hz, focusing on its spatially coherent motion. The second azimuthal oscillation mode was observed at the frequency of ~0.03 Hz while the corewide oscillation mode was at ~0.1 Hz, and the fluctuation at the corewide mode was much stronger.