Measurement of neutron noise in the presence of a vibrating control plate

Oka, Yoshiaki; An, Shigehiro; Tomii, Kakuzo; Tamura, Kazuyuki

doi:10.1016/0306-4549(77)90009-3

Annals of Nuclear Energy

1977

DOI: 10.1016/0306-4549(77)90009-3

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Measurement of neutron noise in the presence of a vibrating control plate

Yoshiaki Oka

Shigehiro An

Kakuzo Tomii

et al.

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1977

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Cited by 2 publications

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“…A inductance type vibration-sensor was fixed to the top of a mockup fuel element that had the same size as the fuel elements and was located at the position 2-d, from which a pickup of the sensor was stretched out to the spare shim rod. Its reliability had already confirmed by a measurement in JRR-4 (10). Calibration of the vibration amplitude to the output signal was performed with the spare rod itself prior to the measurement.…”

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confidence: 95%

Some Relations of Neutronic Noise with Fluctuation of Inlet Coolant Temperature and Vibration of a Control Rod Obtained by Simultaneous Measurements at KUR

Oka

Kimura

et al. 1977

J. Nucl. Sci. Technol.

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Experiments on reactor noise were conducted at KUR. Depending on the oj)erating condition of the reactor, the cause of the noise are classified into the following four types.1.11 Zero-power noise source due to the branching process of fission neutrons and; or due to random bombardment of neutrons to the detector-under natural circulation of coolant and at essentially zero-power le\·el. 12) Coolant temperature fluctuation due to natural convection-under natural circulation and at relatively high power level. 13) Flow induced vibration of shim control rods-under forced circulation of coolant and at low power le,·eJ. r-!1 Fluctuation of inlet coolant temperature-under forced circulation and near the maximum power level. Vibration of a spare shim control rod and fluctuation of inlet coolant temperature were measured simultaneously with the neutronic noise. Then the noise sources of the types 131 and r-!r were verified. The vibration of a control rod has a broad spectrum in low frequency region besides the large peak at l.J Hz. The fluctuation of inlet coolant temperature is non-white noise and consists of large low frequency component. The theoretically predicted sink structures in the neutronic PSD relating to the transit time of inlet coolant temperature tluctuation through the core were not obsen·ed in the experimental results.

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confidence: 95%

Some Relations of Neutronic Noise with Fluctuation of Inlet Coolant Temperature and Vibration of a Control Rod Obtained by Simultaneous Measurements at KUR

Oka

Kimura

et al. 1977

J. Nucl. Sci. Technol.

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Some Relations of Neutronic Noise with Fluctuation of Inlet Coolant Temperature and Vibration of a Control Rod Obtained by Simultaneous Measurements at KUR

Oka

Kimura

et al. 1977

Journal of Nuclear Science and Technology

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Measurement of neutron noise in the presence of a vibrating control plate

Cited by 2 publications

References 6 publications

Some Relations of Neutronic Noise with Fluctuation of Inlet Coolant Temperature and Vibration of a Control Rod Obtained by Simultaneous Measurements at KUR

Some Relations of Neutronic Noise with Fluctuation of Inlet Coolant Temperature and Vibration of a Control Rod Obtained by Simultaneous Measurements at KUR

Some Relations of Neutronic Noise with Fluctuation of Inlet Coolant Temperature and Vibration of a Control Rod Obtained by Simultaneous Measurements at KUR

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