[en] The services of INIS-SDI in Czechoslovakia have been provided by the Nuclear Information Centre since 1976. Users are provided with primary profiles, secondary profiels and retrospective searches. By the end of 1978, the Centre supplied 376 primary profiles and 446 secondary profiles (copies of primary profiles). Retrospective searches are processed for the period 1973 to 1977. A research into INIS-SDI service utilization showed that the Centre's library is the most significant resource of primary documents for the users. (Ha)

No abstract available

No abstract available

[en] A technique is proposed of monitoring the amount of high viscosity reaction mixture retained in cylindrical horizontal reactors with horizontal mixers in which a new design is applied of the radioactive source/detector configuration. The beam axis from the source makes an angle of 4 to 40deg with the vertical reactor axis and passes at a distance of 0.1 to 0.35-fold the inner reactor diameter from the reactor centre. (M.S.)

[en] A 3-dimensional reactor model is described equipped with various types of detectors for the monitoring, prediction and control of the reactor spatial power distribution. The coherence method is described of the identification of the signal noise model based on the decomposition of signal noise to partial components and the determination of inter-relations with the perturbation system. The possibilities were tested of using the coherence method of identification and good agreement was found of the analytical frequency transfer functions with the identified transfer functions. The coherence method of identification can be applied in investigating mechanical oscillations of reactor core components due to neutron noise, hydrodynamic oscillations and instabilities, local disturbances in heat transfer, local boiling, and global and local neutron power oscillations. (J.B.)

[en] Information on INIS output materials - INIS magnetic tape, INIS Atomindex, full texts of non-conventional literature on microfiches. Complex is provided of INIS-SDI service by the Nuclear Information Centre for CSSR. The Unified Software System (USS) of the UVTEI-UTZ (the Central Technical Base of the Central Office for Scientific, Technical and Economic Information) is used for the automated processing of INIS magnetic tapes. A survey of INIS-SDI services in the years 1974 to 1978 is given. The further development of the system consists in the use of the terminal network, with direct access to the IAEA computer in Vienna. (author)

No abstract available

[en] A survey is given of the sources of impurities in the sodium primary circuit of the fast breeder reactor, their identification, behaviour, effects on the thermodynamic properties of sodium and the possibilities of their removal. An experimental programme is suggested whose results would give a comprehensive idea of the behaviour of the individual types of impurities in the sodium circuit. (F.M.)

[en] The mathematical model is based on the method of flux synthesis in which the fundamental quantity of state of the reactor, i.e., the spatial distribution of many-group neutron flux, is sought in the form of the sum of products of the so-called experimental and mixing functions. The model is designed for monitoring, prediction and possible control of the reactor power distribution. The results are shown of calculating the spatial neutron flux distribution in the WWER-440 reactor. (M.D.)

[en] Observations were made of the course of secondary immunological response, using the immunocytoadherence method under the influence of 450 R whole-body irradiation on mice spleen following secondary ram erythrocyte immunization. Irradiation was applied for 24 hours, 72 hours and 6 days after an i.p. administration of antigen. Irradiation was immediately followed by an absolute and a relative decrease in RFC number and by an overall drop in spleen cell number. In case of irradiation applied prior to reaching the secondary reaction quantitative maximum, an increment was observed and another RFC quantitative maximum was reached between days 15 and 20 after irradiation. Small and medium size lymphocyte values decreased immediately after irradiation. Where irradiation took place prior to reaching the quantitative maximum of a normally proceeding anamnestic reaction, large lymphocytes constituting RFC increased after a certain period of stagnation or even without it. The total proportion of plasmatic series cells on irradiation tended to increase and they became a prominent cell element after delayed quantitative RFC maxima had been reached and reached complete predominance towards the end of the period of time under observation. A relative increase in the proportion of macrophages was observed immediately after irradiation. (author)