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Ozaki, Shinji
Dai-22-Kai Genshiryoku Shisetsu Dekomisshoningu Gijutsu Koza Tekisuto, p.53 - 88, 2009/11
no abstracts in English
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8th International Conference of Water Chemistry of Nuclear Reactor Systems, 0 Pages, 2000/00
None
Ozaki, Yoshihiko; Suda, Kazunori; Yoshikawa, Shinji; Ozawa, Kenji
PNC TN9410 96-114, 145 Pages, 1996/04
We have been developing an autonomous operation system for nuclear power plants by substituting Al for plant operators and in addition conventional controllers used in existing plants, taking the case of loop type LMFBR power plant. As the first step of the development, we have been developing the prototype system since 1991. The prototype system realizes automatic operation on normal condition and semiautomatic recovery operation in cooperation with plant operators for not only limited anomalies but also transient events. The system contains various knowledge based system, which are referred to by agents, such as diagnosis systems, control systems, simulating systems, and so on. In the system, a hierarchical distributed cooperative system configuration is adapted. This configuration is realized by an object-oriented multi-agent system. In addition, methodology diversity is assured by preparing plural agents, each of which is based on different methodology each other, therefor, it is expected for the reliability of diagnosis or control to be improved. As for the diagnosis systems, at present, they consists of two diagnostic reasoning levels, a plant level one based on a hierarchical plant functional nlodel, and a local level one based on a physical causal network model using qualitative reasoning technique. In the paper, we discuss the methodology diversity for the above-mentioned local level diagnostic reasoning, and propose a new diagnosis method using alarm annunciation system. The combination of annunciated alarms is expected to be peculiar to the anomalous phenomenon or accident. Moreover, as the state of affairs is developing, each appearance of the combination is changing with time peculiarly to each anomaly or accident. The matter is utilized for the new diagnosis method. The combination patterns of annunciated alarms with progress of the events are prepared in advance under the condition of the anomalies or accidents by use of plant simulator. Each ...
; ; Yoshikawa, Shinji; Ozawa, Kenji
PNC TN9410 96-101, 40 Pages, 1996/04
Since it is desired to enhance availability and safety of nuclear power plants operation and maintenance by removing human factor, there are many researches and developments for intelligent operation or diagnosis using artificial intelligennce (AI) technique. We have been developing an autonomous operation and maintenance system for nuclear power plants by substituting AI's and intelligent robots. It is indispensable to use various and large scale knowledge relative to plant design, operation, and maintenance, that is, whole life cycle data of the plant for the autonomous nuclear power plant. These knowledge must be given to AI system or intelligent robots adequately and opportunely. Moreover, it is necessaly to insure real time operation using the large scale knowledge base for plant control and diagnosis performance. We have been studying on the large scale and real time knowledge base system for autonomous plant. In the report, we would like to present the basic concept and expecting performance of the knowledge base for autonomous plant, especialy, autonomous control and diagnosis system.
-scanning apparatusShiratori, Yoshitake; Nagamatsu, Kenji; Ozaki, Shinji; Hayashi, Takashi
PNC TN3410 92-016, 7 Pages, 1992/12
None
Ozaki, Shinji
no journal, ,
The maintenance management method of the equipment in the outline and decommissioning stage of an decommissioning of "Fugen" is explained.
