| 摘要 |
FIELD: nuclear engineering. ^ SUBSTANCE: the proposed invention is related to the ultrasonic methods of testing for detection of failed fuel elements and may be used when checking the lead-proofness of the fuel elements at spent fuel assemblies, being in water. The proposed methods includes excitation of ultrasonic waves in the fuel element can, detection of the useful reflected and twice reflected signals and determination of the nonleak-proofness when using the amplitude of the useful reflected signal. As a preliminary the ultrasonic waves are excited in the can of an air-tight fuel element or in its simulator by means at a transducer. In this case the wave frequency increases from 0.25 MHz. The value of the frequency of, at which the twice reflected signal is not detected, is determined. Then the ultrasonic waves at the frequency of are excited in the can of a tested fuel element and the conclusion is made on its nonleak-proofness. ^ EFFECT: increased sensitivity and reliability at detection of failed fuel elements. ^ 3 cl, 10 dwg |
