Cognitive process in plant diagnosis using an operator cognitive model

Kazuo Furuta, Makoto Takahashi, Hidekazu Yoshikawa, Kazunori Sasaki, Toru Itoh, Masayuki Matsumiya, Takeharu Sakaue, Kazuhiro Kiyokawa, Akira Hasegawa

Research output: Contribution to journalArticlepeer-review


An operator cognitive model has been constructed referring to Rasmussen's ladder model, and a simulation system of operator performance has been developed. Computer simulation was then performed to investigate subjects' behavior in a cognitive experiment concerning PWR nuclear power plant diagnosis. The knowledge bases used in the simulation were constructed from the interview to the subjects. Confidence on each hypothesis and performance history of operators were compared between the experiment and the simulation, and the simulation could well explain the behavior of the subjects in the results of event identification, confidence on the results, hypotheses conceived during diagnosis, and plant parameters observed, which indicates the validity of the operator model. The order of parameter observation, however, disagreed, and it has been clearly shown that knowledge on system configuration of the plant as well as the physical layout of interface should be considered.

Original languageEnglish
Pages (from-to)65-74
Number of pages10
JournalNippon Genshiryoku Gakkaishi/Journal of the Atomic Energy Society of Japan
Issue number1
Publication statusPublished - 1996


  • Blackboard system
  • Cognitive experiment
  • Cognitive process
  • Computerized simulation
  • Event identification
  • Knowledge base
  • Plant diagnosis
  • Reactor operator models
  • Similarity matching
  • Symbolic processing


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