Application of Continuous and Structural ARMA modeling for noise analysis of a BWR coupled core and plant instability event

M. Demeshko, A. Dokhane, T. Washio, H. Ferroukhi, Y. Kawahara, C. Aguirre

研究成果: Contribution to journalArticle査読

5 被引用数 (Scopus)

抄録

This paper presents a first application of a novel Continuous and Structural Autoregressive Moving Average (CSARMA) modeling approach to BWR noise analysis. The CSARMA approach derives a unique representation of the system dynamics by more robust and reliable canonical models as basis for signal analysis in general and for reactor diagnostics in particular. In this paper, a stability event that occurred in a Swiss BWR plant during power ascension phase is analyzed as well as the time periods that preceded and followed the event. Focusing only on qualitative trends at this stage, the obtained results clearly indicate a different dynamical state during the unstable event compared to the two other stable periods. Also, they could be interpreted as pointing out a disturbance in the pressure control system as primary cause for the event. To benchmark these findings, the frequency-domain based signal transmission-path (STP) method is also applied. And with the STP method, we obtained similar relationships as mentioned above. This consistency between both methods can be considered as being a confirmation that the event was caused by a pressure control system disturbance and not induced by the core. Also, it is worth noting that the STP analysis failed to catch the relations among the processes during the stable periods, that were clearly indicated by the CSARMA method, since the last uses more precise models as basis.

本文言語英語
ページ(範囲)645-657
ページ数13
ジャーナルAnnals of Nuclear Energy
75
DOI
出版ステータス出版済み - 1 2015
外部発表はい

All Science Journal Classification (ASJC) codes

  • 原子力エネルギーおよび原子力工学

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