Health test of components in nuclear reactor instrument systems using process identification

Bergdahl, B.-G.; Oguma, Ritsuo

doi:10.1016/0149-1970(88)90081-9

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Experimental Determination Of the Time Behaviour Of The Ther...1

Temporal Harmonics Excitation In Modal Parameters1

Spectrum Analysis For Simulated Data1

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Cited by 2 publications

(3 citation statements)

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“…Figure 5.5 shows the result. Further examples for thermocouple noise analysis can be found in [ [7][8][9] ].…”

Section: Experimental Determination Of the Time Behaviour Of The Ther...mentioning

confidence: 99%

Determination of the time behaviour of thermocouples for sensor speedup and medium supervision

Sarnes¹,

Schrüfer²

2007

Estonian Journal of Engineering

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“…Figure 5.5 shows the result. Further examples for thermocouple noise analysis can be found in [ [7][8][9] ].…”

Section: Experimental Determination Of the Time Behaviour Of The Ther...mentioning

confidence: 99%

Determination of the time behaviour of thermocouples for sensor speedup and medium supervision

Sarnes¹,

Schrüfer²

2007

Estonian Journal of Engineering

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“…In consequence, Eq. (17) explains that the n 0 response contains the oscillation component of n 1 (ω 0 ) via the fourth term, when the modal response is computed using Eq. (9a).…”

Section: Temporal Harmonics Excitation In Modal Parametersmentioning

confidence: 99%

“…The simulated APRM, LPRM and reactivity responses were converted to power spectrum density (PSD) functions by the fast Fourier transform technique 16) in order to analyze the potential nonlinear behavior in the simulated regional os- In the past noise analysis studies for the regional limit cycle oscillation data, 17,18) several temporal harmonics occurred in the PSD functions of both LPRM and APRM responses, and these harmonics also appeared at the multiples of the characteristic resonance frequency (∼ 0.6 Hz) in the present analysis.…”

Section: Spectrum Analysis For Simulated Datamentioning

confidence: 99%

Nonlinear Behavior under Regional Neutron Flux Oscillations in BWR Cores

Ikeda

Ama

Hashimoto

et al. 2001

Journal of Nuclear Science and Technology

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A three-dimensional time-domain core analysis code was applied to numerical simulations for an actual regional neutron flux oscillation observed in a commercial BWR core, in order to investigate potential nonlinear behavior in its coupled neutronic and thermohydraulic system. The present study shows existence of the nonlinear reactivity interaction between the fundamental and first azimuthal spatial harmonics modes of neutron flux distribution under the regional event. The spectrum analysis of the simulated data provides a unique result, that is, temporal harmonics peaks are excited at the even-and odd-order multiples of the characteristic resonance frequency in the fundamental and first spatial harmonics responses, respectively. The numerical simulation also shows that the strong nonlinearity of the coupled neutronic and thermohydraulic dynamics locally appears where the power unstably oscillates with large amplitudes, inducing the power shift and reactivity bias which are shown in the core-wide situation under the global oscillations. This contributes to suppression of the divergence of the local power oscillation, and also to development of the saturated self-limited cycles under the regional oscillations.

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Health test of components in nuclear reactor instrument systems using process identification

Cited by 2 publications

References 0 publications

Determination of the time behaviour of thermocouples for sensor speedup and medium supervision

Determination of the time behaviour of thermocouples for sensor speedup and medium supervision

Nonlinear Behavior under Regional Neutron Flux Oscillations in BWR Cores

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