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Generalized consistency checking of multivariable redundant measurements (GCCM) and common-mode failure detection

Technical Report ·
OSTI ID:6457472
; ;
The limitations of the single-variable consistency checking algorithm for validating redundant measurements are remedied by extending the algorithm to multivariable signals. The redundant measurements of each variable in a subsystem are combined with an estimation of the variable using prediction model. A complex logic algorithm has been developed to perform simultaneous consistency checking of all the variables under consideration. The overall objectives of the generalized consistency checking of multivariable signals (GCCM) are: to separate sensor fault (bias decalibration) from normal changes in the system, and to detect and isolate common-mode sensor failures (indicating correlation in sensor failures). The new algorithm has been implemented in a general purpose PC and in the Micro VAX-II workstation. Both simulated signals and operation data from a four-loop Westinghouse PWR have been used to test the algorithm. This module is being incorporated into the overall signal validation system. Because of the completeness of cross comparison variables, the use of model-based prediction and the use of measurement redundancy, the logic for detecting instrument degradation can be extended to the monitoring of actuator anomaly. The latter is an important aspect of system diagnostics, and may be considered as a dual problem to that of signal validation. 3 refs., 118 figs., 37 tabs.
Research Organization:
Tennessee Univ., Knoxville (USA). Dept. of Nuclear Engineering
DOE Contract Number:
AC02-86NE37959
OSTI ID:
6457472
Report Number(s):
DOE/NE/37959-26; ON: DE89007219
Country of Publication:
United States
Language:
English

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Related Subjects

22 GENERAL STUDIES OF NUCLEAR REACTORS
220400* -- Nuclear Reactor Technology-- Control Systems
42 ENGINEERING
420200 -- Engineering-- Facilities
Equipment
& Techniques
99 GENERAL AND MISCELLANEOUS
990220 -- Computers
Computerized Models
& Computer Programs-- (1987-1989)
ALGORITHMS
COMPUTERS
DIGITAL COMPUTERS
MATHEMATICAL LOGIC
MATHEMATICS
MEASURING METHODS
MICROCOMPUTERS
MULTIVARIATE ANALYSIS
PERSONAL COMPUTERS
PWR TYPE REACTORS
REACTORS
STATISTICS
SYSTEM FAILURE ANALYSIS
SYSTEMS ANALYSIS
WATER COOLED REACTORS
WATER MODERATED REACTORS