Real-time condition monitoring of LOCA via time-frequency domain reflectometry

Chun Kwon Lee, Gu Young Kwon, Seung Jin Chang, Moon Kang Jung, Jin Bae Park, Han Soo Kim, Yong June Shin

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

The maintenance of control and instrumentation (C&I) cables is crucial to safety of operating nuclear power plants. Therefore, when an accident occurs, there is a need for an accurate assessment of the impact on the cable's integrity. Unfortunately, most cable diagnostic methods are destructive and real-time assessment of the effect of accidents is not possible. Thus, in this paper, we present an analysis of a specific type of accident, a loss of coolant accident (LOCA), on C&I cables in real-time, based on time-frequency domain reflectometry (TFDR). Because the TFDR is sensitive to the signal-to-noise ratio and distortion of a reflected signal, we apply postprocessing techniques that compensate the dispersion based on the estimated propagation constant and a denoising method using singular value decomposition. The approach is verified by experimentally monitoring condition changes of localized LOCA hot spot in different C&I cables. The results are also validated by comparing with elongation at break test results.

Original languageEnglish
Article number7869345
Pages (from-to)1864-1873
Number of pages10
JournalIEEE Transactions on Instrumentation and Measurement
Volume66
Issue number7
DOIs
Publication statusPublished - 2017 Jul 1

Fingerprint

loss of coolant
Loss of coolant accidents
Condition monitoring
accidents
cables
Cables
Accidents
nuclear power plants
Singular value decomposition
integrity
Nuclear power plants
elongation
maintenance
Elongation
safety
Signal to noise ratio
signal to noise ratios
decomposition
propagation

All Science Journal Classification (ASJC) codes

  • Instrumentation
  • Electrical and Electronic Engineering

Cite this

Lee, Chun Kwon ; Kwon, Gu Young ; Chang, Seung Jin ; Jung, Moon Kang ; Park, Jin Bae ; Kim, Han Soo ; Shin, Yong June. / Real-time condition monitoring of LOCA via time-frequency domain reflectometry. In: IEEE Transactions on Instrumentation and Measurement. 2017 ; Vol. 66, No. 7. pp. 1864-1873.
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Real-time condition monitoring of LOCA via time-frequency domain reflectometry. / Lee, Chun Kwon; Kwon, Gu Young; Chang, Seung Jin; Jung, Moon Kang; Park, Jin Bae; Kim, Han Soo; Shin, Yong June.

In: IEEE Transactions on Instrumentation and Measurement, Vol. 66, No. 7, 7869345, 01.07.2017, p. 1864-1873.

Research output: Contribution to journalArticle

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