Abstract The Information Technology Center at SRI International is developing a hybrid expert system to monitor and recommend actions in response to the growth of a crack in the reactor core of a light water nuclear power plant. The model of the nuclear power plant is implemented using an object-oriented representation. This model communicates with a FORTRAN program that calculates the crack growth as a function of electrochemical and hydraulic parameters outside the reactor core. These parameters are simulated by the object-oriented power plant model and supplied to the FORTRAN program. When the FORTRAN program completes its calculations, the information generated about the crack growth is sent back to the power plant model. This information then triggers "knowledge rules" that generate recommendations to the maintenance operators.
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