Mayak Production Association

Ozërsk, Russia

Mayak Production Association

Ozërsk, Russia
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Magomedbekov E.P.,Mendeleev University of Chemical Technology | Belkin D.Y.,Mayak Production Association | Rastunova I.L.,Mendeleev University of Chemical Technology | Sazonov A.B.,Mendeleev University of Chemical Technology | And 2 more authors.
Theoretical Foundations of Chemical Engineering | Year: 2017

A simulation procedure and results of simulation are reported for the operation of a cascade of packed distillation columns for heavy water deprotiation. The mathematical model is based on the results of laboratory-scale tests of a rolled ribbon–screw structured packing developed at the Mendeleev University of Chemical Technology of Russia an a random spiral prismatic packing made from stainless steel. Use of the rolled ribbon–screw packing in the columns provides means to diminish the volume of the separation equipment without changing the cascade throughput capacity and separation factor. © 2017, Pleiades Publishing, Ltd.


Denisov E.I.,Yeltsin Federal University | Betenekov N.D.,Yeltsin Federal University | Logunov M.V.,Mayak Production Association | Voroshilov Y.A.,Mayak Production Association
Radiochemistry | Year: 2017

A novel procedure was suggested for studying the phase distribution of radioactive iodine in the liquid–gas system. Without redox reactions, the degree of iodine transfer into the gas phase is maximal for sulfuric and nitric acid solutions at pH ≤ 1.5. In weakly acidic, neutral, and alkaline solutions, the iodine transfer into the gas phase is insignificant (degree of transfer <0.05). Conditions for stabilization of iodine species (presence of redox reagents, solution acidity) were found. The most efficient purification of 99Мо to remove iodine radionuclides is observed in sulfuric acid solutions, where the probability of formation of IО3 – anions, exhibiting the highest affinity for titanium hydroxide, is minimal. Silver-modified Termoxid sorbents are suitable for selective sorption of iodine only from alkaline solutions (0.3–0.5 M NaOH), with the best result obtained for Т-5(Ag) (iodine distribution coefficient 2000–3000 mL g–1). An additional step of purification of alkaline molybdenum concentrates to remove iodine on Т-5(Ag) sorbent was suggested; it allows the residual iodine content of the molybdenum concentrate to be decreased by a factor of 20. © 2017, Pleiades Publishing, Inc.


Levtsova A.A.,RAS Frumkin Institute of Physical Chemistry and Electrochemistry | Andreev G.B.,RAS Frumkin Institute of Physical Chemistry and Electrochemistry | Budantseva N.A.,RAS Frumkin Institute of Physical Chemistry and Electrochemistry | Tananaev I.G.,Mayak Production Association | Myasoedov B.F.,RAS Frumkin Institute of Physical Chemistry and Electrochemistry
Radiochemistry | Year: 2014

A new U(VI) compound with m-hydroxybenzoic acid, HIm[(UO 2)(C7H5O3)3] ·2H2O, was prepared. Its structure was determined by X-ray diffraction analysis and confirmed by the visible and IR spectra. The coordination number of the U atom is 8, with the hydroxyl O atom not involved in coordination with the metal ion. The main structural constituents of the compound are [(UO2)(C7H5O3) 3]- anions formed by the sixcoordinate uranyl ion and three hydroxybenzoate ions acting as bidentate ligands. The imidazolium cations participate in hydrogen bonding, linking the adjacent [(UO2)(C 7H5O3)3]- anions. The compound contains water molecules of crystallization, also participating in H bonding. © 2014 Pleiades Publishing, Inc.


Melent'ev A.B.,Mayak Production Association | Mashkin A.N.,Mayak Production Association | German K.E.,RAS Frumkin Institute of Physical Chemistry and Electrochemistry
Theoretical Foundations of Chemical Engineering | Year: 2016

In the present study, the effect of deviations in the process has been determined during the process of the extraction processing of spent nuclear fuel (SNF) VVER-440 on RT-1 plant on the purification of uranium from 99Tc, 125Sb, 106Ru, 137Cs, 228Th, etc. The uranium decontamination factors during purification from these nuclides for both cycles of the Purex scheme of plant are calculated. It has been shown that, upon deviations in the process (the short-term shutdown of process, fluctuations of hydrodynamic mode, deposition of elements in the extractors, etc.), an increase in the uranium decontamination factors during purification from most unwanted nuclides is observed, except for technetium. However, it has been found that, at an increased inflow of Tc to the second extraction cycle, the purification of the final uranium product from this element may be insufficient. © 2016, Pleiades Publishing, Ltd.


Wieser A.,Helmholtz Center for Environmental Research | Vasilenko E.,Mayak Production Association | Zankl M.,Helmholtz Center for Environmental Research | Greiter M.,Helmholtz Center for Environmental Research | And 4 more authors.
Radiation Measurements | Year: 2011

The nuclear workers of the Mayak Production Association had regular check-ups including medical diagnostic X-ray examinations since start of the production lines in 1948. Doses from diagnostic examinations need to be considered in reconstruction of occupational doses of the workers with electron paramagnetic resonance (EPR) of tooth enamel. The numbers and types of examinations of an individual worker can be assessed from the Mayak PA archives but no information was available on doses delivered to teeth by a single specific examination. Of the twenty one applied examination procedures only three affected the teeth, these being X-ray examinations of teeth, skull and cervical spine. For these three kinds of examinations operational procedures and operating modes of X-ray units were compiled from the archive and photon spectra were obtained from a catalog of spectral data for diagnostic X-rays. Entrance doses in air kerma were calculated using the fluence of photon spectra and absorbed dose in tooth enamel for various tooth positions and exposure geometry was then calculated using dose conversion coefficients obtained from Monte Carlo simulations. Doses were calculated for examinations in 1948-2000. Except for examination of the skull, absorbed doses in enamel of incisors were found to be about twice as large as in enamel of molars. In the period before 1970 the largest mean absorbed doses in tooth enamel were due to X-ray examination of teeth, with 64 mGy and 34 mGy calculated for incisors and molars, respectively. In the same period the lowest mean doses were due to X-ray examination of the skull, with 11 mGy and 12 mGy calculated for incisors and molars, respectively. In the period from 1970 to 2000, largest mean doses in enamel were due to X-ray examination of cervical spine, with 23 mGy and 12 mGy calculated for incisors and molars, respectively. © 2011 Elsevier Ltd. All rights reserved.


Yalkovskaya L.E.,Russian Academy of Sciences | Grigorkina E.B.,Russian Academy of Sciences | Tarasov O.V.,Mayak Production Association
Biophysics | Year: 2011

Chromosome instability in bone-marrow cells and 90Sr accumulation in the bone tissue are studied in rodents (Apodemus (Sylvaemus) uralensis Pall., 1811 and Apodemus agrarius Pall., 1771)* inhabiting the Eastern Ural Radioactive Trace (EURT) zone (Kyshtym radiation accident 1957) and adjacent areas of the Urals. Intensive mutagenic process in both species from impact plots (soil pollution by 90Sr, 2322-16690 kBq/m2) is found. Significant positive correlation of the frequency of aberrant cells and the concentration of 90Sr is shown. Possible causes of the lack of resistance to long-term mutagenic factors (over 100 generations in the 50 years since the accident), such as migration of animals and the specific configuration of the EURT zone (an extended narrow territory with a sharply falling gradient of radionuclide pollution), which considerably decrease the probability that certain changes will be fixed and inherited in a series of generations of rodents, are discussed. © 2011 Pleiades Publishing, Ltd.


Magomedbekov E.P.,Mendeleev University of Chemical Technology | Belkin D.Y.,Mayak Production Association | Selivanenko I.L.,Mendeleev University of Chemical Technology | Rastunova I.L.,Mendeleev University of Chemical Technology
Theoretical Foundations of Chemical Engineering | Year: 2016

Some results of studying the mass-transfer characteristics of random stainless steel spiral prismatic packings in the separation of hydrogen and oxygen isotopes via vacuum water distillation in columns of 60 and 120 mm in diameter have been reported. The effect of the size of the packing element and the pressure on the ultimate throughput and the height equivalent to a theoretical plate has been shown. © 2016, Pleiades Publishing, Ltd.


Volkova T.S.,National Research Nuclear University MEPhI | Rudskikh V.V.,National Research Nuclear University MEPhI | Orlova V.A.,Mayak Production Association | Tananaev I.G.,National Research Nuclear University MEPhI
Russian Journal of Applied Chemistry | Year: 2015

Results are reported obtained in a study aimed to develop a technology for quantitative transfer of lithium from an aqueous solution to soluble (chloride, nitrate, or sulfate) and insoluble (carbonate) salts via, respectively, evaporation and precipitation. The thus synthesized samples are identified and their phase composition is determined by X-ray phase analysis. The samples were examined as regards their stability in storage in air. It was shown that lithium sulfate and carbonate are the most stable forms among the compounds considered. © 2015 Pleiades Publishing, Ltd.


Bobrov P.A.,Mayak Production Association | Slyunchev O.M.,Mayak Production Association | Semenova T.A.,Mayak Production Association
Radiochemistry | Year: 2015

The possibility of using precipitation and sorption methods for removing artificial radionuclides from drainage water and groundwater on radiochemical production sites was examined. Chemical treatment of drainage water and groundwater (by sodium carbonate softening and phosphate precipitation) allows the specific activity to be decreased by a factor of 15-70. Depending on the chemical treatment procedure, from 2 to 6 kg m-3 of dry slime with the specific activity of up to 1 × 108 Bq kg-1 is formed. Chemical treatment of drainage water and groundwater allows the specific activity of solutions to be decreased to the level lower than the minimal significant specific activity, so that the purified water passes from the category of liquid radioactive wastes to the category of industrial wastes contaminated with artificial radionuclides. © 2015 Pleiades Publishing, Inc.


Magomedbekov E.P.,Mendeleev University of Chemical Technology | Belkin D.Y.,Mayak Production Association | Selivanenko I.L.,Mendeleev University of Chemical Technology | Rastunova I.L.,Mendeleev University of Chemical Technology
Theoretical Foundations of Chemical Engineering | Year: 2016

Some results of studying the structured rolled ribbon-screw packing during the separation of hydrogen and oxygen isotopes via water distillation in columns with diameters of 60 and 120 mm and different heights of the packed bed have been presented. The results of studying the effect of process conditions on the ultimate throughput and the height equivalent to a theoretical plate have been considered. The coincidence of the mass-transfer characteristics in the separation of hydrogen and oxygen isotopes via vacuum water distillation has been shown. © 2016, Pleiades Publishing, Ltd.

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