Method and device for detecting defective nuclear fuel elements
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United States of America Patent
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-
Aug 4, 1987
Grant Date -
N/A
app pub date -
Dec 16, 1983
filing date -
Dec 17, 1982
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Defective fuel elements in an assembly immersed in a liquid are detected using ultrasonic absorption. A train of ultrasonic waves having a frequency and duration such that propagation takes place as Lamb waves is applied to an end portion of the sheath. The echoes are detected. Transmission and detection are repeated for different frequencies. Some frequencies are in a range corresponding to absorption by water which may be contained in the sheath. Other frequencies correspond to a range for which there is an echo at a mechanical defect of the sheath, such as a crack.
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