Instrument failure detection and reconstruction methodology in space-time nuclear reactor dynamic systems with fixed in-core detectors
- Dept. of Nuclear Engineering, Korea Advanced Inst. of Science and Technology, P.O. Box 150, Cheon-gryang, Seoul (KR)
- Korea Atomic Energy Research Inst., P.O. Box 7, Daeduk-Danji, Taejon (KR)
This paper on the detection and isolation of instrument failures in nuclear reactors equipped with fixed in-core detectors that were studied in order to improve reliability and safety. This was done by representing the reactor as a linear stochastic distributed parameter system. A bank of detection observers based on the Kalman filter concept was constructed in order to isolate component failures via robust observation. Each observer was sensitive to only one specified component failure. This was done to minimize the covariance matrix error. However, because observed deviations may be attributed to changes in system behavior, failure decisions are confirmed by a multiple consecutive miscomparison (MCM) counter. Following failure detection, the failed sensor's output is replaced with an estimate from the failure-free filter. Various simulations were performed to verify this failure detection method as applied to reactor instrument failures. It was demonstrated that the method can detect both single- and common-mode failures. Also, without hardware redundancy, it can describe the system dynamics in the event of failures.
- OSTI ID:
- 5763063
- Journal Information:
- IEEE Transactions on Nuclear Science (Institute of Electrical and Electronics Engineers); (United States), Journal Name: IEEE Transactions on Nuclear Science (Institute of Electrical and Electronics Engineers); (United States) Vol. 38:5; ISSN 0018-9499; ISSN IETNA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
220400 -- Nuclear Reactor Technology-- Control Systems
220900* -- Nuclear Reactor Technology-- Reactor Safety
ERRORS
MEASURING INSTRUMENTS
RADIATION DETECTORS
REACTOR COMPONENTS
REACTOR CORES
REACTORS
RELIABILITY
SAFETY
SIMULATION
SPACE-TIME
STOCHASTIC PROCESSES
SYSTEM FAILURE ANALYSIS
SYSTEMS ANALYSIS