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Experimental Analysis of Coherent Neutron Flux Fluctuations Observed in a Pressurized Water Reactor

Tomoaki Suzudo, Erdinç Türkcan, Hans Verhoef

Nuclear Science and Engineering

Volume 129 / Number 2 / June 1998 / Pages 203-208


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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.

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