Fast Reactors and Accelerator Driven Systems Knowledge Base

Conference Article: Autoregressive techniques for acoustic detection of in-sodium water leaks

Hayashi, K. (Japan Atomic Energy Research Inst., Tokai, Ibaraki (Japan). Tokai Research Establishment)

Abstract

We have been applied a background signal whitening filter built by univariate autoregressive model to the estimation problem of the leak start time and duration. In the 1995 present benchmark stage, we evaluated the method using acoustic signals from real hydrogen or water/steam injection experiments. The results show that the signal processing technique using this filter can detect reliability the leak signals with a sufficient signal-to-noise ratio. Even if the sensor signal contains non-boiling or non-leak high-amplitude pulses, they can be classified by spectral information. Especially, the feature signal made from the time-frequency spectrum of the filtered signal is very sensitive and useful.

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key words: Fast Neutron Spectrum Systems, Nuclear Technology
Reference:
Acoustic signal processing for the detection of sodium boiling or sodium-water reaction in LMFRs. Final report of a co-ordinated research programme 1990-1995
International Atomic Energy Agency, Vienna (Austria)
IAEA-TECDOC--946, pp:179-202