[en] During regular in-service inspections the state of reactor internals is checked and faults in material detected. Visual checks are made for surface inspection, usually remote-controlled using closed circuit television. In order to check the whole volume of the material the ultrasonic pulse echo method is used, controlled manually and automatically. Data collection and processing is carried out using the IDA microcomputer which controls the operation of the control unit, communicates with the system of manipulator drive control, the peripherals, the external computer and the operator. Following completion of measurements the data are processed in detail using a digital computer which arranges the data according to the failures which they concern, displays the location of the defects and evaluates the quality of the tested component. (M.D.)