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

Очистка регенерированного урана в каскадах с обогащением 235U до 5 %

На основе вычислительного эксперимента исследована очистка регенерированного урана в каскаде, оптимизированном на заданную концентрацию 232U, со смещением точки подачи питания в сторону отбора. Определены параметры каскада с обогащением 235U в отборе менее 5 %, обеспечивающие в отвальном потоке практически полную очистку от 232U при концентрации 235U, близкой к питанию. Рассмотрены возможности одновременной очистки от 234U при уменьшении извлечения регенерированного урана в отвал каскада. Для снижения концентрации 236U в низкообогащенном уране, производимом из очищенного регенерированного урана, предложены дополнительные операции разбавления и обогащения

Эффективность использования потенциалов разделения при оптимизации каскадов

Рассмотрена оптимизация каскадов по критерию максимума разделительной способности элементов, определяемой с помощью потенциала разделения. На основе вычислительного эксперимента и сравнения с минимизацией суммарного потока установлено, что независимо от эффекта обогащения на ступенях каскада для бинарных смесей применимы разные формы потенциалов, включающие их зависимость от коэффициентов разделения. При многокомпонентном разделении выбор потенциала разделения зависит от изотопной смеси и особенностей процесса

Оптимизация каскада центрифуг для разделения многокомпонентной смеси изотопов

Разработан метод расчета оптимальных параметров каскада газовых центрифуг для разделения многокомпонентной смеси изотопов. Предложена универсальная вычислительная схема, позволяющая оптимизировать каскад при разных критериях оптимизации. На основе вычислительного эксперимента исследованы особенности минимизации суммарного потока каскада при заданных внешних потоках и концентрации целевого изотопа. Показано, что при смещении точки подачи питания каскада относительно оптимума, обеспечивающего минимально возможное число центрифуг, можно существенно изменить концентрацию нецелевых изотопов в отборе и отвале каскада. Такая особенность оптимизации может быть эффективно использована для очистки регенерированного урана от 232U

Reprocessed uranium purification in cascades with 235U enrichment to 5%

The purification of reprocessed uranium in a cascade optimized to a prescribed 232U concentration with the feed flow displaced toward the product flow is investigated by means of a computational experiment. The parameters of a cascade with 235U enrichment <5% in the product, which ensures almost complete purification from 232U with 235U concentration close to that in the feed flow, are determined. The possibilities for simultaneous purification from 234U with reduction of reprocessed uranium extraction into the waste flow are examined. Additional dilution and enrichment operations are proposed in order to decrease the 236U concentration in low-enrichment uranium produced from purified reprocessed uranium. © 2013 Springer Science+Business Media New York

OPTIMIZATION OF MULTISTREAM CASCADES WITH A GIVEN NUMBER OF GAS CENTRIFUGES FOR PURIFICATION OF REGENERATED URANIUM HEXAFLUORIDE FROM 232, 234, 236U

method for optimization of multistream cascades for purification of regenerated ura-nium from even isotopes is improved by using several types of stages with a given number of gas centrifuges. The operating modes of the stages have been determined by the artificial bee colony algorithm

Optimization of the Cascade with Two Additional Product Flows for the Simultaneous Concentration of Intermediate Molybdenum Isotopes

A technique has been developed for optimizing multiflow cascades to obtain highly concentrated intermediate molybdenum isotopes. A computational experiment was carried out to separate a mixture of molybdenum isotopes. Various cases for the separation of molybdenum isotopes in cascades with large step separation coefficients corresponding to gas centrifuges were considered. It is shown that using of the bee swarm optimization has an advantage over the Hook-Jeeves method. © 2020 American Institute of Physics Inc.. All rights reserved

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

Separation of boron isotopes in optimal cascade of uniflow gas centrifuges

Was considered a problem of an optimization of concurrent gas centrifuges for separation of Boron isotopes in form of trifluoride BF3. As the criteria was used a minimum of total number of gas centrifuges upon the given external parameters of the cascades' scheme. The method is based on the analytical relationships for the flows of stages, received under approximating minimization of the total feed flow. Conducted cascade calculations showed that it is possible to obtain BF3 with enrichment up to 99.9 % of 10B in the selection and up to 0.1 % in the waste, which is equivalent to 99.9 % of 11B. © 2020 Published under licence by IOP Publishing Ltd