No abstract available

[en] A report is presented of the fifth CMEA symposium whose task it was to evaluate the studies implemented in the field in the member states within 1976 and 1980 and to consider the trends for the period 1981-85. (M.D.)

No abstract available

[en] Economic aspects of U and Pu recycle are discussed with a reference to the WWER-type reactors-based nuclear power in Czechoslovakia. Major results of forecasting the nuclear electricity generating capacities and related spent fuel stockpiles into the year of 2000 are presented. The economic analysis of the spent fuel reprocessing shows that recovered U overlaps the reprocessing costs for reprocessing plants with productivity more than 2 tonnes/day. Pu recycling will increase the effect. The economics of fast breeder reactor spent fuel reprocessing is also considered in a nutshell. Unaccounted reprocessing costs connected with radioactive waste disposal can influence, as stated the overall conclusions

No abstract available

No abstract available

[en] Specific problems are discussed encountered in fast reactor fuel reprocessing. A survey is given of the current state of art in fluoride reprocessing in different countries and studies conducted in Czechoslovakia in this field are summed up. (author)

[en] In solutions containing uranium and zirconium salts the concentration of sulfuric acid is adjusted to 30 to 50%. Zirconium forms crystals of zirconium sulfate tetrahydrate while uranium remains in the substrate. (H.S.)

[en] A method is proposed of accelerating hydrolysis of zirconium carbonate complexes from solutions containing carbonate and sulfate mixtures. The solutions containing 0.05 to 2 mol/l carbonates and 0 to 2 mol/l sulfates are heated for 1 to 60 minutes to a temperature of 100 to 250 degC. Zirconium changes into a precipitate insoluble in the mother liquor and the precipitate is then separated. The method allows obtaining pure zirconium as it can be separated from other elements forming carbonate complexes, such as uranium. The mother liquor can be regenerated. (A.K.)

[en] A prototype was designed and built of a sodium aerosol indicator suitable for detecting possible leaks of sodium from experimental facilities. The indicator using the flame photometry principle is designed for continuous operation and requires minimal maintenance. The indicator essentially consists of a flue chamber where sodium particles are heated to the desired temperature. The chamber casing accommodates all connection instruments and an optical system including a photomultiplier. The combustion chamber with a hydrogen burner is housed inside the casing. The flame light concentrated by a hollow mirror and a double condenser to the photomultiplier photocathode passes through a double interference filter. In testing, a measurement error was found due to underpressure changes in the combustion chamber, voltage instability at the photomultiplier and hydrogen pressure instability. The resulting measurement error, however, does not exceed 8%. (Z.M.)