Reactor diagnostics rule generation through statistical pattern recognition
- Michigan Univ., Ann Arbor, MI (United States). Dept. of Nuclear Engineering
This paper reports on a pattern recognition algorithm developed for systematic generation of shallow knowledge for nuclear power plant transient diagnostics. The algorithm involves feature selection and pattern discovery. The selection of N best features is attained by discarding redundant and nondiscriminatory features. An entropy minimax algorithm is used to discover the patterns by searching an N-dimensional feature space, populated with transient events of the data base, to locate subspaces that discriminate among the event classes. These patterns are then represented as production rules for diagnostics. A series of approximations have been implemented in the algorithm to handle the discovery of patterns in multidimensional space. The authors have also developed a perturbation algorithm within the entropy minimax framework to update the patterns in an incremental fashion as new data are obtained. The Midland Nuclear Power Plant Unit 2 simulator is used to generate 144 single-failure events. Based on these events, 25 production rules are generated, representing a two-level hierarchical knowledge structure of single-failure events along the critical safety function approach. These rules represent the common characteristics of time-varying features over the diagnostic time, thereby providing diagnostic capability at any time during the transient.
- OSTI ID:
- 5354634
- Journal Information:
- Nuclear Science and Engineering; (United States), Journal Name: Nuclear Science and Engineering; (United States) Vol. 107:4; ISSN 0029-5639; ISSN NSENA
- Country of Publication:
- United States
- Language:
- English
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ACCIDENTS
ALGORITHMS
ANALOG SYSTEMS
CALCULATION METHODS
ENRICHED URANIUM REACTORS
FUNCTIONAL MODELS
MATHEMATICAL LOGIC
MATHEMATICS
MIDLAND-2 REACTOR
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PROCESS HEAT REACTORS
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REACTOR SAFETY EXPERIMENTS
REACTOR SIMULATORS
REACTORS
SIMULATORS
STATISTICS
THERMAL POWER PLANTS
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TRANSIENTS
WATER COOLED REACTORS
WATER MODERATED REACTORS