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Hybrid diagnostic system for nuclear power plants   GOFUKU Akio1, MINOWA Hirotsugu1, TAKATORI Kenji1, TAKAHASHI Makoto2, NAGAMATSU Takashi3, and FURUSAWA Hiroaki1   1. Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima-Naka, Kita-ku, Okayama700-8530, Japan (fukuchan@sys.okayama-u.ac.jp) 2.     Graduate School of Engineering, Tohoku University, 6-6 Aramaki-Aoba, Aoba-ku, Sendai, Miyagi 980-8579, Japan 3.  Graduate School of Maritime Sciences, Kobe University, 5-1-1 Fukaeminami-machi, Higashinada-ku, Kobe 658-0022, Japan   Abstract: A hybrid-type diagnostic system to give a final diagnostic result by integrating the results of sub-systems is one of promising ways to develop a flexible diagnostic system. This article describes the general configuration of a hybrid-type diagnostic system and presents the techniques for the important topics of how to integrate the diagnostic results of sub-systems and how to select suitable signals for diagnosis. The article also introduces the outline of a hybrid diagnostic agent system for the fast-breeder reactor, “Monju”. Keyword: diagnostic system; hybrid system; integration of diagnostic results; selection of signals
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