[en] The effect was studied of radiation on the genitals of store pests and on the course of oogenesis. Also monitored was the development of irradiated beetles to generation F₂, the radiation effect on the individual species and stages of the development of weevils. The values LD₁₀₀, LD₅₀, SD₁₀₀, SD₅₀ for imagos and LD₁₀₀ and SD₁₀₀ for larvae and pupae of 14 species of cereal pests are tabulated. The dose 30 krad +-10% is sufficient for destroying or at least sterilizing all store pests known in this country with the exception of mites. Low irradiation doses (1 to 2 krad) stimulate certain beetles in generation F₁ by 5 to 10%. The mill and bakery quality of bread cereals is not reduced by irradiation with up to 50 krad. (E.F.)

[en] This paper presents the results of acoustic emission measurements obtained from cyclical loading of deposition welded samples with cracks (mm) in the deposition and in the transition zone weld deposition - base metal. The results show that acoustic emission characteristics depend very sensitively on the structure of the material through which the crack runs. The cracks detected below the deposition during pressure tests of the reactor pressure vessel were analysed. (orig.)

[en] The following topics were examined: (i) Methodology of fracture tests at temperature gradients and pressurized thermal shock (PTS) cooling tests on large specimens (1500x1200x140 mm) with a designed postulated crack and other smaller cracks in the cooled area (test performed on a ZZ 8000 (80MN) loading stand); (ii) simulation of radiation embrittlement of tested material near the end of the RPV designed life, the material is subjected to standard mechanical property tests and fracture tests of standard test specimens modelling the PTS regime of material loading; (iii) 100% NDT tests of a specimen before the beginning of tests and μTOFD before and after each particular test of a specimen; (iv) on-line monitoring of the test conditions based on instrumentation of a specimen with thermocouples, COD and strain gauges together with on-line monitoring of Acoustic Emission during the tests; (v) calculation of K_l at the critical points of the crack front during the test, based on monitored boundary conditions; (vi) fractographic analysis after the fracture of a specimen and evaluation of the whole test. (P.A.)

[en] The techniques are discussed used for the application of acoustic emission in monitoring nuclear reactor pressure vessels. The use of these techniques in actual structures is backed up by research work associated with fracture tests on specimens. The acoustic emission data acquisition instrumentation is also described. In addition to the monitoring of the material it enables detection and location of loose parts and detection of coolant leaks. (author). 4 figs., 1 tab