Vibration, neutron noise and acoustic monitoring in German LWRs

Wach, D.

doi:10.1016/0029-5493(91)90089-z

Cited by 6 publications

(2 citation statements)

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“…At a high frequency, the variation of the phase in the thermal and epithermal energy ranges increases, but in the important energy range (>1.0 keV) the phase remains constant (see Figures 7 and 8). Principally, the frequency affects the phase of the noise via the ratio / in (4) and the term related to the delayed neutrons in (5). In the fast energy, that is, high velocity of neutron, / becomes small and has less effect on the phase of the induced noise even at a high frequency.…”

Section: Neutron Noise Induced By Localized Perturbationsmentioning

confidence: 99%

“…Online diagnostics for monitoring the operating status of light water reactors (LWRs) based on analyzing the detector signals of neutron noise were deployed widely in various countries [1][2][3][4][5]. Measurement of the neutron noise in fast reactors, one of the next generation nuclear systems, and a test facility has also been conducted [3,6,7].…”

Section: Introductionmentioning

confidence: 99%

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Properties of Neutron Noise Induced by Localized Perturbations in an SFR

Tran

2015

Science and Technology of Nuclear Installations

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Investigation of the properties of neutron noise induced by localized perturbations in a sodium-cooled fast reactor has been performed using a multigroup neutron noise simulator. Three representations of the noise source associated with the perturbations of absorption, fission, and scattering cross sections, respectively, were assumed to be located at the first fuel ring around the central assembly. The energy- and space-dependent noise, that is, the amplitude and the phase, was calculated in a wide range of frequencies, for example, 0.1–100 Hz. The results show that in the important energy range (>1.0 keV) where the noise amplitude is significant the phase is almost constant with energy at the calculated frequencies despite the source types. At low frequencies, the variation of the phase is negligibly small at a large distance from the source. The perturbation in several fast groups has a significant contribution and dominates the amplitude and the phase of the induced noise.

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Section: Neutron Noise Induced By Localized Perturbationsmentioning

confidence: 99%