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Significant differences were found in the degree of penetration of 137Cs, 90Sr, and 241Am into the bottom sediments depending on the type and origin of the waterbody. In most cases, the upper 10 cm layer of bottom sediments is the most contaminated, but the degree of penetration of 137Cs, 90Sr, 241Am in it is higher than the observed values for soils. 90Sr migrates most deeply. The highest content of radionuclides is found in closed and low-flowing waterbodies, such as isolated floodplain lakes in the Pripyat rive...

Background. The issue discussed in this paper is caused by the historically established opinion that in thermal reactors the fission of uranium-235 by fast neutrons, which are formed during its fission by thermal neutrons, can be ignored. The purpose of the study is to assess the effect of the fission of uranium-235 by fast neutrons on the nuclear safety of a thermal reactor. Methods. For the study, the method of comparing fast neutron multiplication coefficients in the fission of uranium-235 by fast neutrons and ...

For assuring the stability of important buildings (nuclear power plants) during strong earthquakes, the soil strata under these buildings should not get deformed during the events. In the paper will be analyzed the nonlinear behavior of soil layers during strong earthquakes. As follows from the soil dynamics experiments, shear modulus G and damping D become functions of strain level , and nonlinear behavior could take place. Further, changes could appear in the mechanical properties of the soil layers, expressed b...

The super-compaction is the process used to conversion of the radioactive waste into a stable, compacted solid form as a cylindrical pellet. A characteristic of the compaction is that it reduces the volume of waste but the amount of radioactivity remains the same. A super-compaction facility operating under a force of 2000 tones which compresses the material contained in the standard drum of 220 l is used for treatment of radioactive waste. A compressed form, reduced by its high with the diameter of the metal mold...

Nowadays, the best solution of radioactive waste management seems to be its deposition in deep repositories. However, construction of these repositories brings new issue for civil engineers. The most important one is elimination or inhabitation of radionuclide release in the environment. Therefore, new kinds of building materials have to be developed. This article is focused on improvement of the most utilized and the most common material -concrete. The main idea of this study was to improved radionuclides sorptio...