[en] Acoustic testing of welded joints, austenitic overlay and the basic material of the pressure vessel body is carried out using a four channel ultrasonic instrument to which are connected ultrasonic probes with different specifications. The probes are specialized in detecting faults in welded joints, cracks under overlays and defects at the boundary of overlay and basic material. The ultrasonic instrument also contains an analog part which consists of the usual circuits, and control and evaluation parts. (E.S.)

[en] The qualification demands are defined for checking welding and surfacing work. The contribution of ultrasonic crack detection is discussed. Tests of an X-ray/TV chain are made to simplify and speed up crack detection. The evaluation of the results of crack detection is discussed. (E.S.)

[en] The content is presented of American standard E 748-80 on neutron radiography whose method is defined. Neutron sources are dealt with as are methods of neutron detection and further requirements on technical equipment. Basic applications of neutron radiography are given. (E.S.)

[en] The results are presented of the test operation of an X-ray/TV system whose introduction into crack detection increased the number of tested castings and brought significant savings. (E.S.)

[en] The seminar proceedings contain 21 papers. Seven papers were inputted in INIS. Topics covered include: applications of X-ray/TV imaging for quality control of welded joints and crack detection of castings; computer codes for calculating exposure times in ⁶⁰Co gamma radiography of structures and materials; specifications of sealed sources for materials testing; thermal neutron radiography; ultrasonic testing of reactor pressure vessels; organizing and testing aids for welding and surfacing jobs in nuclear power plants. (J.P.)

[en] The control of internal quality of welded joints of pressure vessels is designed using the X-ray/TV imaging method. The application is assumed of X-ray instrument Isovolt by Seifert, X-ray/TV imaging system RBV 17 (Seifert) or the developed Czechoslovak equipment, and complementary recording instrument (Seifert). Testing was carried out on standards with artificial defects, with butt welds and wire gauges. The possibilities of the method were tested, and Czechoslovak and peak foreign equipment compared. (E.S.)

[en] The problem is discussed of the determination of exposure time for the instantaneous activity of a ⁶⁰Co source and the optimal distribution of film darkening in relation to the changing thickness of the radiographed construction and the changing focal distance. The exposure time is influenced by the properties of the used X-ray film. Exposure rate at the place of the film is influenced by geometry and by the properties of the radiographed materials and the used gamma radiation source. The relations are given for exposure rate, exposure time for a given darkening, and the darkening achieved for a given exposure time. A program was developed for computation of the exposure time with the HP-65 pocket calculator. (E.S.)

[en] The revision is being prepared of several standards which are to be replaced by one single standard, and of decrees issued by the two national ministries of health care, on health protection from ionizing radiation. It has been suggested that the validity period of the certificate should be replaced by a recommended service life of the sealed source and recommended intervals of leakage testing by UVVVR and the user. The suggested amendment distinguishes authorized tests carried out by the manufacturer and in-service tests carried out by the user. The determination of service life should take into consideration data provided by the manufacturer, the area of use of the sealed source, environmental impacts during operation and experience gained with similar types of sources. (E.S.)