[en] Acoustic emission offers the possibility of inspecting the whole volume of large structure from a limited number of access points. The paper discusses the historical development of the technique and describes the instrumentation and analytical methods used for interpretation. Experience has shown that acoustic emission is not a universal inspection tool and the latter portion of the paper describes applications where the technique does have some chance of success. (author)

[en] Short communication

[en] At present, ultrasonic holography can resolve and image faults of 1 mm and more and with distances of one ultrasonic wavelength. The main field of application is for thick-walled structural components. Depending on the expected orientation, test probe arrangements as in standard ultrasonic testing are chosen. (orig./RW)

[en] Reliability in non-destructive evaluation (NDE) is discussed with respect to technique capability and repeatability. Technique capability may be assessed by laboratory experiments on real or simulated cracks. Recent advances in mathematical modelling methods are leading to the development of computer codes that may be used in the design of ultrasonic inspection systems. From a detailed analysis of the Plate Inspection Steering Committee (PISC I) results it has been possible to formulate a probabilistic model of defect detection. This model is used to illustrate a number of routes that may be followed to achieve further improvements in NDE. It is concluded that greater emphasis in research programmes should be placed on establishing the reasons for, and then eliminating, the lack of repeatability apparent in ultrasonic methods. (U.K.)

No abstract available

[en] NDT plays a very important role in the power industry involving four conventional methods (UT, PY, MT, RT) that can be classified into four areas such as: inspection of incoming raw materials and spare parts, to repair fabrication and power plant inspection. But the most vital of all is the NDT requirement during the preventive maintenance shutdown and the results of such testing can spell the difference between an orderly scheduled and an emergency unscheduled shutdown of power plants. (IMA). 3 figs

[en] Non-destructive testing has a variety of application in the power industry ranging from inspection of raw materials to the testing of parts being repaired or fabricated. Inspection requirements include ultrasonic testing, magnetic particle testing, dye penetrant testing, hardness testing and replication. The efforts of the Maintenance Engineering Center (MEC) of the National Power Corporation in the field of NDT application are concentrated on the equipment used to perform special field services such as reblading and dynamic balancing. (ISD)

[en] Performance of a testing apparatus, from the sensor to the recorder is defined by a certain number of qualities: sensitivity, accuracy, limit of detection, maximum testing speed which are used to compare the results obtained with two different apparatus Benches for ultrasonic testing of tubing for the cladding of nuclear fuels are studied as an example

[en] One of the components of the tube inspection system for flan detection and dimension measurement is a computer which controls a sorting plant, so that control may be fully automatic. This contribution describes the experiences and improvements which during the last few years have led to a system which is stable and sufficiently accurate so as to meet the rigid specification requirements in dimension and flan control of precision tubes. In standard inspection of cladding tubes this means that the whole control process, for flaws as well as dimensions may be carried out at a velocity of 6 m tube/min. (orig.)

[en] The paper describes SAFT, synthetic aperture focusing technique, a defect sizing method. The system is portable and the high resolution ultrasonic techniques can be applied on site. The SAFT processing, as well as the software, hardware and displays in the system are explained. Results obtained with the system on laboratory specimens and on site inspection are briefly described. (U.K.)