Nuclear reactor noise analysis using a deconvolution method
Thesis/Dissertation
·
OSTI ID:6111696
The true amplitude modulation of the resonant signal from the ex-core neutron sensors of a pressurized water reactor (PWR) was studied. A power-spectral-density curve of the fluctuating signal from an ex-core neutron sensor of the H.B. Robinson II PWR shows a resonant peak centered at 6.64 Hz. The modulation of an oscillatory signal within a selected frequency band carries information which is not present in the frequency itself. The extraction of the signal of interest in the presence of noise is generally performed by a band-pass filter, but the signal is distorted by this filtering process and a deconvolution method is developed to restore the true amplitude modulation of the signal after this distortion. The amplitude of the band-pass filtered signal is generated by the Hilbert transform, this amplitude is deconvolved with the amplitude of the impulse response of the band pass filter and a successive approximation technique is employed for a deconvolution procedure. Lateral core barrel motion and the response of the ex-core neutron sensors were simulated to study the correlation between the signals of ex-core neutron sensors located 90/sup 0/ apart around the core. From the analysis of the simulated signal it was demonstrated that the Lissajous curve derived from the band-pass filtered signal may not represent the true core barrel motion, and it is suggested that the use of the deconvolution procedure provides a closer approximation of the true core barrel motion. Results indicate that, from the analysis of the deconvolved amplitude of neutron fluctuation of the H.B. Robinson II PWR, the core barrel motion shows short bursts of resonance.
- Research Organization:
- North Carolina State Univ., Raleigh (USA)
- OSTI ID:
- 6111696
- Country of Publication:
- United States
- Language:
- English
Similar Records
Investigation of reactor dynamics by fluctuation methods using a deconvolution technique
Inference of core barrel motion from neutron noise spectral density. [PWR]
Investigation of the dynamics of a reactor system by fluctuation methods. Final report, Part 1. [PWR]
Thesis/Dissertation
·
Thu Dec 31 23:00:00 EST 1981
·
OSTI ID:5564875
Inference of core barrel motion from neutron noise spectral density. [PWR]
Technical Report
·
Mon Mar 14 23:00:00 EST 1977
·
OSTI ID:7312383
Investigation of the dynamics of a reactor system by fluctuation methods. Final report, Part 1. [PWR]
Technical Report
·
Mon Jul 14 00:00:00 EDT 1980
·
OSTI ID:5871000
Related Subjects
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
210200 -- Power Reactors
Nonbreeding
Light-Water Moderated
Nonboiling Water Cooled
22 GENERAL STUDIES OF NUCLEAR REACTORS
220900* -- Nuclear Reactor Technology-- Reactor Safety
AMPLITUDES
ENRICHED URANIUM REACTORS
OSCILLATIONS
POWER REACTORS
PWR TYPE REACTORS
REACTOR NOISE
REACTORS
RESONANCE
ROBINSON-2 REACTOR
SIGNAL DISTORTION
WATER COOLED REACTORS
WATER MODERATED REACTORS
210200 -- Power Reactors
Nonbreeding
Light-Water Moderated
Nonboiling Water Cooled
22 GENERAL STUDIES OF NUCLEAR REACTORS
220900* -- Nuclear Reactor Technology-- Reactor Safety
AMPLITUDES
ENRICHED URANIUM REACTORS
OSCILLATIONS
POWER REACTORS
PWR TYPE REACTORS
REACTOR NOISE
REACTORS
RESONANCE
ROBINSON-2 REACTOR
SIGNAL DISTORTION
WATER COOLED REACTORS
WATER MODERATED REACTORS