Induced nuclear reactions: processes – systems – and elements – Testing – sensing – measuring – or detecting a fission reactor... – Flux monitoring
Patent
1994-05-27
1996-01-02
Walsh, Donald P.
Induced nuclear reactions: processes, systems, and elements
Testing, sensing, measuring, or detecting a fission reactor...
Flux monitoring
376216, 376217, 376255, 376259, G21C 1700
Patent
active
054815754
ABSTRACT:
A method and a device for detecting oscillations in the core of a boiling-water nuclear reactor (BWR) comprising a plurality of neutron detectors, wherein instability is detected based on oscillations in the output signals of the neutron detectors. For each one of a number of selected neutron detectors, oscillations in the output signals of the neutron detectors are detected. The oscillations are detected on the basis of an oscillation signal (SS) which indicates that an oscillation criterion is fulfilled. An alarm signal for remaining oscillations Ka is generated if the oscillation signal (SS) remains during one delay interval (T3). A first alarm signal (LR) is generated if the oscillation signal (SS) indicates that the oscillation criterion is fulfilled at least once, during each of a predetermined number of consecutive alarm intervals (T1). An alarm signal for intermittent oscillations (Ra) is generated by blocking the first alarm signal (LR) when the alarm signal for remaining oscillations (Ka) is present. (FIG. 5)
REFERENCES:
patent: 4815108 (1989-03-01), Oda
patent: 5141710 (1992-08-01), Stirn et al.
patent: 5174946 (1992-12-01), Watford et al.
patent: 5225149 (1993-07-01), Banda
Back Anders
Borlin Stefan
ABB Atom AB
Chelliah Meena
Walsh Donald P.
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