Space-Dependent Neutron Noise Spectra in Bare and D₂O-Reflected Reactor Lattices

Experiments were performed on a large nuclear reactor to investigate the effects of detector placement and reflection on neutron noise spectra and space dependence of detector efficiency. The magnitudes, break frequencies, and rolloff slopes of the spectra were found to be affected by both detector placement and reflection. The space dependence of detector efficiency was found to be proportional to that of average detector count rates.