Developing a knowledge base for noise diagnostic expert system of reactor internal behaviour

Noise diagnostic expert system is built for determination of the origin of noise descriptors change during operation from that in stationary state. The series of IF-THEN rules is compiled for event-oriented analysis of core - barrel pendulum motion investigation. The theoretical model for core uncovering identification as a function of core barrel vibration was developed. For distinguishing the influence of flow regime and boiling noise from in-core vibration on ex-core detector behaviour, the autoregressive model is used. The fundamental relations between knowledge base and the verification of data base validity is mentioned. For the prediction and analysis of strains conditions of safety related components of WWER-440 reactor, a mathematical model was developed. Reactor pressure vessel, cover and internals are represented as a discrete vibrating system with 24 degree of freedoms. (author)