Induced nuclear reactions: processes – systems – and elements – Testing – sensing – measuring – or detecting a fission reactor... – Leak detection
Patent
1982-11-04
1985-05-14
Cangialosi, Sal
Induced nuclear reactions: processes, systems, and elements
Testing, sensing, measuring, or detecting a fission reactor...
Leak detection
376259, 73611, G21C 1706
Patent
active
045171521
ABSTRACT:
The invention relates to a method for testing fuel element tubes by ultrasonic energy. For testing, each tube becomes disposed in the space between a transmit transducer and a receive transducer. The echo signals falling within a predetermined time interval are evaluated. Since the distance between the transducers may vary as the transducers move through the space between fuel element tubes, the transmitted signal reaching the receive transducer without passing through the tube may be confused with the revolving echo signal. Therefore, this invention discloses an arrangement for cyclically controlling the setting of the time gate before each such tube is in position between the transducers. To this end, the ultrasonic transit time of signals between the transmit transducer and the receive transducer is measured in the gap between the last tested tube and the next to be tested tube. A constant value is subtracted from the measured transit time value and this constant value is selected so that the transmitted signal received during the transit time measurement falls just outside the gated time interval.
REFERENCES:
patent: 4313791 (1982-02-01), Lawrie et al.
patent: 4366711 (1983-01-01), Weilbacher et al.
patent: 4428236 (1984-01-01), Votava et al.
"Ortung Defekter Brennstabe in Bestrahlten Brennelementen", Tagungsbericht der Jahrestagung Kerntechnick 80, Reactortagung 1980, Berlin, 25-27, Mar. 1980, published by Deutsches Atomforum e.V. Bonn, p. 827 et seq., G. Baro.
Pieper Kurt
Scharpenberg Rainer
Brown Boveri Reaktor GmbH
Cangialosi Sal
Feig Philip J.
Krautkramer GmbH
Steinberg Ervin B.
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