Abstract
The first neutron noise measurements on SPX are presented in this paper. They were carried out throughout the year 1986 for power levels of 5 % to 80 % of nominal power. For these measurements one in-vessel detector and two under vessel detectors were used. Some frequencies around 1 Hz were always present these evolving with the operating parameters. The rms values of these resonances never exceeded half a pcm and were within the range 0.3–0.5 pcm (4 σ). The interdependence of the operating parameters made it difficult to find out which one had a greater influence on the frequency evolution of the neutron noise signals. However a good candidate seemed to be the primary pump speed. The observed resonances beeing then originated in the fuel assemblies or control rods vibrations due to hydraulical excitation. More measurements in various operating conditions are needed to verify such a hypothesis, but the fact is that the flux signal fluctuations of SPX are low which was a point to verify at the starting period of the reactor.
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