Regenerated Uranium Separation in Matched Abundance Ratio Cascade with Additional Product Flow

This paper addresses known methods used to purify regenerated uranium in single and double cascades. A new method for separating regenerated uranium has been developed that enables a significant reduction of the concentration of 232,234U in the additional product flow. Matched abundance ratio cascades (M∗-cascades) with different key components and additional product flow are used in the new method. Main product flow of the M∗-cascade contains low enriched regenerated uranium. It can be used for reactor fuel production. Purified product can be enriched in the ordinary cascade in compliance with the requirements of ASTM C 996-10 set for isotopes 232,234U in low enriched commercial uranium, which is usually produced from the natural one. Computer experiment based on the new method has been performed. The experiment shows that the best cascade with the maximum flow of the enriched purified product is M∗-cascade with key components 232,236U. © Published under licence by IOP Publishing Ltd

Restoration of the isotopic composition of reprocessed uranium hexafluoride using cascade with additional product

In reprocessed uranium, derived from an impoverished fuel of light-water moderated reactors, there are isotopes of 232, 234, 236U, which make its recycling remarkably difficult. A method of concentration of 235U target isotope in cascade's additional product was proposed to recover the isotopic composition of reprocessed uranium. A general calculation procedure is presented and a parameters' optimization of multi-flow cascades with additional products. For the first time a numeric model of a cascade that uses the cuts of partial flows of stages with relatively high separation factors was applied in this procedure. A novel computing experiment is carried out on separation of reprocessed uranium hexafluoride with providing a high concentration of 235U in cascade's additional product with subsequent dilution. The parameters of cascades' stages are determined so as to allow reducing the 232, 234, 236U isotope content up to the acceptable. It was demonstrated that the dilution of selected products by the natural waste makes it possible to receive a low enriched uranium hexafluoride that meets the ASTM C996-15 specification for commercial grade. © 2020 Korean Nuclear Societ

Production of highly concentrated intermediate molybdenum isotopes in optimal cascade with two additional product flows

The problem of highly concentrated molybdenum isotopes production in multiflow cascades is considered. A method of the cascade with two additional product flows optimization has been developed. Two components intermediate in weight are concentrated simultaneously in those flows. The optimization problem is solved using a variation of the partial flow cuts of the cascade stages with large separation coefficients. The optimization criterion is the minimum of the stage total feed flow while ensuring a given concentration of isotopes. A computational experiment was carried out to separate a mixture of molybdenum hexafluoride. The experiment demonstrated the features of intermediate components concentrating in additional product flows of the cascade. © 2020 Published under licence by IOP Publishing Ltd

Ordinary Cascades for Purification of Reprocessed Uranium Hexafluoride from 232,234,236U Isotopes

Reprocessed uranium gained from the spent nuclear fuel contains 232,234,236U isotopes within, which considerably hamper its reuse. It is proposed to use an ordinary cascade to reduce the concentration of 232,234U. The output purified from 232,234U is obtained in the cascade waste. The authors analysed the peculiarities of reducing concentration of 236U after the enrichment of reprocessed uranium hexafluoride in terms of 235U in the ordinary cascade and its subsequent dilution. A computational experiment was performed. Parameters of cascade stages were predetermined, which allow to reduce the content of 232,234,236U to an acceptable level. © 2022 Institute of Physics Publishing. All rights reserved

REPROCESSED URANIUM REFINEMENT IN THE MARC-CASCADES WITH INTERMEDIATE PRODUCT

A new method of reprocessed uranium refinement is proposed. The method is based on the calculation of the MARC cascade with intermediate product flow. According to the developed method calculations were made for MARC cascades based on different uranium isotopes. The best cascade was chosen using maximum flow criteria

THE PROBLEM OF ECOLOGICAL EDUCATION AND THE PROSPECTS OF ECOLOGIZATION

Environmental education and upbringing are the basis of the ecological well-being of society, and environmental competence is becoming an important factor in the formation of personality. Today, environmental education in the Republic of Belarus is based on the principle of continuity, it operates at all levels of education and implies continuous replenishment of the population’s knowledge in biology, ecology, environmental protection etcetera. Nevertheless, there are a number of problems that do not allow to fully reveal the potential of environmental education, for example, in higher education institutions. The analysis of syllabus and the rethinking of the educational process will lead to significant progress in the field of education ecologization.Экологическое образование и воспитание являются основой экологического благополучия общества, а экологическая компетентность становится важным фактором становления личности. На сегодняшний день экологическое образование в Республике Беларусь основывается на принципе непрерывности, то есть действует на всех ступенях образования и подразумевает постоянное пополнение знаний населения в областях биологии, экологии, охраны окружающей среды и прочих. Тем не менее, существует ряд проблем, которые не позволяют в полной мере раскрыть потенциал экологического образования, в частности, в высших учебных заведениях. Анализ учебных планов и переосмысление ведения учебного процесса смогут дать значительный прогресс в области экологизации образования